Telecom Manual English

PREFACE

1. It is with great pleasure that a new Indian Railway Telecommunication Manual is being presented for the guidance of Signal and Telecom Department in particular and all railwaymen in general. The last edition of Telecommunication Manual was brought out in December 1971. Since then, Telecom Department has seen sea changes due to revolutionary evolutions in telecommunication technologies leading to obsolence of earlier systems. This has modernized both types of systems viz., connected with train operations as well as Passenger Amenities and Information system.

2. Therefore, it becomes imperative to bring out a new Telecommunication Manual encompassing all the technological changes relevant to the working of Telecommunication Department of Indian Railways. Over a period of time, Optical Fibre Communication has completely replaced the conventional landline communication systems for long haul. Moreover, with the evolution of IP based data network, a paradigm shift in the concept of telecom networks has taken place which caters to both Voice as well as Data transmission. Wireless communication has seen complete transformation from Microwave based systems to GSM-R/TETRA based systems. Satellite Communication has completely broken the physical boundaries and has made it possible to connect the remotest of places to the main network.

3. This manual provides detailed guidelines for setting up and maintaining the telecommunication systems covering various applications and fields. With the proliferation of telecommunication technology across the country by various organizations, the role of regulatory bodies such as WPC and PTCC have increased manifold and hence, chapters on procedures for dealing with these organizations have also been incorporated. However, it has not been the intention nor it is possible to provide for every technical aspect required for planning, installation and maintenance of various telecom equipments. The Chief Signal & Telecom Engineers of the Railways and RDSO are authorized to supplement additional guidelines required for day-to-day working.

4. The preparation of Telecommunication Manual has been a great effort with the contribution of officers from Zonal Railways & IRISET. The entire script has been checked and updated by RDSO and approved by Railway Board. Without the collective effort of various organizations of Indian Railways, this enormous task would not have been completed and hence their contribution is acknowledged with gratitude.

5. In keeping with the demand of e-working, this Manual is being brought out in electronic as well as printed form. It is sincerely hoped that the Manual would serve the purpose for which it has been created.

(A.K. Kapoor) New Delhi. Additional Member/Telecom October, 2007 Railway Board

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CHAPTER I

ORGANISATION OF THE SIGNAL AND TELECOMMUNICATION DEPARTMENT

SECTION A- GENERAL

1.1 ORGANISATION IN THE HEADQUARTER OFFICE

(a) The Chief Signal & Telecommunication Engineer- The Chief Signal & Telecommunication Engineer is the administrative and professional head of the Signal & Telecommunication Department and is directly responsible to the General Manager for its efficient and economical working.

b) The Chief Communication Engineer - The Chief Communication Engineer assists the Chief Signal & Telecommunication Engineer in the administrative and professional work for all communication matters.

c) The Chief Signal Engineer- The Chief Signal Engineer assists the Chief Signal & Telecommunication Engineer in the administrative and professional work for all signalling matters.

d) The Chief Planning Engineer (Signal & Telecommunication)- The Chief Planning Engineer (S&T) assists the Chief Signal & Telecommunication Engineer in planning and execution of works.

e) The Deputy Chief Signal & Telecommunication Engineer- The Deputy Chief Signal & Telecommunication Engineer assists the Chief Signal & Telecommunication Engineer, Chief Signal Engineer and Chief Communication Engineer in the administrative and professional work.

f) Senior Scale Officers- Senior Scale Officers designated as Senior Signal & Telecommunication Engineers are employed in the Headquarters Office of each Railway and work directly under the administrative control of the Chief Signal & Telecommunication Engineer or the Engineer-in-Chief (S&T) or the Deputy Chief Signal & Telecommunication Engineer.

g) Assistant Signal & Telecommunication Engineers- They shall be responsible to the Senior Scale Officer/Officers or to the Deputy Chief Signals & Telecommunication Engineer.

1.2 ORGANISATION ON A DIVISION

(a) A Signal & Telecommunication Engineer in Junior Administrative Scale, Senior Scale or Junior Scale, is incharge of all the signal and telecommunication equipment on the division and works under the administrative control of the Divisional Railway Manager. If there is more than one JA Grade officer, one shall be exclusively incharge of telecom assets and other for signalling assets.

(b) The Signal & Telecommunication Engineer incharge of a division is also responsible to the Chief Signal & Telecommunication Engineer for the efficient maintenance and control installation of all the signal and telecommunication equipment on the division.

(c) The strength of the Gazetted officer shall be determined by DISTUs (Divisional Integrated Signal and Telecom Units) and ZISTUs (Zonal Integrated Signal and Telecom Units) in the HQ.

1.2.1 TELECOMMUNICATION:

(a) The telecommunication work on each division shall be divided into Sr. Section Engineer/Section Engineer/Junior Engineer.

(b) On a division, each SSE/SE/JE shall be responsible to the Divisional Signal & Telecommunication Engineer/Sr. Divisional Signal & Telecom Engineer through the Assistant Signal & Telecommunication Engineer, for efficient maintenance and correct installation of all telecommunication equipments under his charge.

1.2.2 DUTIES OF Sr. SECTION ENGINEER/SE/JE:

The essential duties of SSE/SE/JE are:-

(a) Inspection and efficient maintenance of telegraph and telephone equipment such as keys, sounders, relays, junction boards, teleprinters, magneto, central battery and auto exchanges, telephone repeaters and other telecommunication installations at large stations including wireless installations. Indicators, Public address System, Interactive Voice Response System, Optical Fibre System, Message Switching System, Computer Communication, Train Radio Communication.

(b) Execution of all works involving alterations to the existing installations, and installations of new equipment, its adjustment and connections.

(c) Carrying out periodical tests on line wires independently as well as jointly with the officials of the Posts & Telegraphs department.

1.2.3 STAFF UNDER SSE/SE :

(a) Each SSE/SE shall be assisted by one or more JE, where necessary, and Technicians shall be provided under him for maintenance. The strength of JE and Technicians shall be fixed in accordance with the density of work and other local conditions.

(b) Each JE must be provided with a gang for attending to works that may be considered normally beyond the scope of the Technicians.

(c) Each JE may be provided with office clerks depending on the quantum of office work. An office khalasi may be provided, where necessary.

(d) Where railways underground telecommunication cables including Optical Fibre exist (as in electrified areas), a cable break-down transport such as a pick up van shall be provided. An emergency gang with full complement of cable jointing materials, tools and testing equipments should be available with the break-down vehicle.

SECTION B

STRENGTH, CHARGES, DESIGNATIONS AND CODE INITIALS FOR VARIOUS TYPE OF STAFF, INSTALLATIONS AND FUNCTIONS

1.3 Strength and charges of SSE/SE, JE, Technicians , section gangs and the strength of the office staff shall be fixed by the Chief Signal & Telecommunication Engineer, with due consideration to the nature of installation density of work, size of installation and general importance of work.

DESIGNATION AND CODE INITIALS

DESIGNATION CODE INITIAL

(a) OFFICERS

(i) Chief Signal & Telecommunication Engineer CSTE

(ii) Chief Communication Engineer CCE

(iii) Chief Signal Engineer CSE

(iv) Chief Planning Engineer(S&T) CPE(S&T)

(v) Dy. Chief Signal & Telecommunication Engineer Dy. CSTE

(vi) Signal & Telecommunication Engineer(Senior SSTE(Tele) Scale) in the Headquarters Office (Telecommunication)

(vii) Assistant Signal & Telecommunication Engineer ASTE(Tele) (Telecommunication).

(b) Sr. SECTION ENGINEER

(i) Senior Section Engineer in HQ Office (Telecommunication) SSE(Tele) HQ (ii) Senior Section Engineer(Telecommunication) SSE(Tele) (iii) Section Engineer SE (iv) Jr. Engineer JE

(c) TECHNICIANS

(i)Telecommunication Technicians TC (ii) Wireless Technicians WT (iii) Cable Jointer CJT (iv) Lineman LM (v) Motor Mechanic MMC (vi) Aerial Rigger (Mast Rigger) AR

(d) INSTALLATIONS AND FUNCTIONS

Telecommunications T Works /Construction W Maintenance M Stores S Headquarters Correspondence work HQ Auto Exchanges (AX)

Trunk Exchanges & Manual Exchanges (TX) Line Plant (LP) Telegraphy (TY)

Traffic Train Control ( TC) Sound Distribution System (PA) Electric Clocks (E/C) Emergency Mobile Communication System (MOBILE) Yard Communication System (YARD) High Frequency Radio Communication System (HF)

Line of Sight Systems( UHF/VHF/Microwave) (MW) Power Plant System (PP) Carrier Communication (CC)

Cable (CABLE) Optical Fibre (OFC) Repeater Station Cable (RSQ) Cable Hut (CHQ) Computers (COMP)

(e) USE OF CODE INITIALS

(i) Senior Section Engineer of Maintenance (Telecommunication) SSE(Tele/M)

(ii) Section Engineer Incharge of SE(YARD) Yard Communication System.

(iii) Section Engineer of Sound SE (PA & Clocks) Distribution System and Electric Clocks.

(iv) Section Engineer for maintenance of Microwave SE(MW)

CHAPTER II

ROLE OF PTCC AND PTCC CLEARANCES

2.1 Power and Telecommunication Co-ordination Committee (PTCC) is a central standing committee for co-ordination of Power and Telecommunication system. The committee was formed by the Government of India in the year 1949. The role of the committee is to deal with route approval for all new power lines (As per the proforma given in the PTCC Manual 1995 edition, page 36). The clearance of this committee is required before energization of new power lines of 11KV and above, which is given after obtaining clearances from the Railway/Telecom having lines in the area.

2.2 Various committees connected with Power and Telecommunication Co-ordination: i) Central Standing Committee: This consists of two representatives from DOT and

two from Central Electricity Authority (CEA). This was set up by the high level committee to look into estimates, which have resulted in delay in settling re-engineering cases.

ii) High Level Committee: This is a committee at the level of secretaries or Chairman/Members of the Board from Power and Telecommunication sectors. The committee is assisted by officers from the two sides. Cases where no consensus could be arrived at the level of the central PTCC are referred to this committee. Officers from the Railways are invited when there are issues involving them.

iii) Central PTCC: This consists of members from the CEA, DOT, Railways and the Army. The composition of the committee as formulated in 1982 is given in Annexure A. The meetings of the committee are to be held once in three months generally.

iv) State Level PTCC: This is similar to the central PTCC with representatives from the station/region. The composition of the committee as formulated in 1985 is given in Annexure B. The committee is to meet once in a month generally but not later than once in 3 months.

2.3 i) Central PTCC deals with cases of energization of power lines of 220KV and above.

ii) Cases of energization of power lines up to 132KV DC are processed at the state level. However, for cases of 33KV DC and above up to 132 KV DC, final PTCC clearance is to be given by DET(PTCC).

For cases of above 11KV up to 33KV S/C clearance is given by State Level PTCC.

For power lines of 11KV, clearance is given by DET of the Telecom Department.

2.4 Copies of route map of the proposed electrical lines are to be submitted to the GM(S&T) of the concerned railways in 4 copies. The route map should depict all topographical details including railway lines, rivers, canals and important roads and other land marks like towns, villages with names etc., on either side of the

proposed power line. Topographical maps of the Survey of India are used for this purpose. The distances over which the details are to be marked, are as under:

Power lines of 66KV and above = 8Kms on either side. Power lines of above 11KV and up to 33 KV = 5 Kms on either side.

Power line of 11 KV = 3 Kms on either side.

2.5 On receipt of the route maps, Railways shall check whether the proposed power line falls within the jurisdiction of the zonal railway. If it does not fall within the zonal railways jurisdiction, the proposal shall be returned back to the PTCC without any delay and the railway to which it should be sent shall also be advised. The railway concerned on receipt the proposal shall mark their telecom lines on the maps and submit two copies to the PTCC. The details in full of all the circuits working on the telecom alignments giving the discontinuity points and route length should be furnished.

2.6 Induced voltage calculations are calculated by the following: i) Up to 11KV lines = local DET of the telecom department. ii) Above 11KV and up to 33 KV lines by SDE/PTCC. iii) Above 33 KV DC and above by DET/PTCC.

2.7 Safe limit for induction due to LF induction due to short circuit fault is 430V and is generally the ruling factor. In specific cases, longitudinal induced voltages under normal conditions are to be examined. In case, where the induced voltages due to short circuit fault on the telecom circuits, exceeds prescribed safe limit of 430V, it is necessary to consider various protection measures, so that the equipment installed and the personal working on these circuits are not subjected to the influence of hazardous potentials.

One of the measures, commonly adopted for protection is the use of three electrode Gas Discharge (GD) tube. Two electrodes of the tube are connected to the wires of a telephone pair and the third electrode to the earth, through a earth cap. Under normal conditions, the telecom line is kept insulated. The gap breaks down and the telecom line is virtually earthed, when induced voltage exceeds the pre-determined value (250V). Through the discharge path the earth connection to the tube should be of very low resistance, so that the voltage across the tube is restricted to safer values.

2.8 Protective measures against induced voltages in excess of the safe limits on different types of block instruments in use in Indian Railways is given in Appendix XVII Chapter I of PTCC manual edition 1995. The limits for the block instruments presently in use on IR are given below:

a)Neales Token instrument and Neales tablet instruments with the characteristics similar to Neales token in respect of 3-position relay and lock magnet and Neales D type. i) For induced voltage not exceeding 430V no special precaution is necessary. ii) For induced voltages exceeding 430V metallic return and appropriate Gas Discharge tubes are to be provided. b)SGE Double Line Block Instrument: As at a above.

c) Diado Single Line Tokenless Block Instruments: Without modification this instrument can safely stand induction up to 74V 50 cycles AC induced voltages. For induced voltages up to 650V AC the following modification is to be made: 3-position polarized relay of the type used in Neales token or SG double line block instrument is to be interposed in the line circuit and the existing line relay (N.R.Relay) fed from local battery through the contacts of polarized relay. Also the line condensers C1 & C2 each of the microfarad capacity with a voltage rating of 160V are to be replaced by condensers of equal capacitance but with a voltage rating of 1000V. Standard gas dischargers will also have to be provided for the lines.

d) Podanur make Single Line Tokenless Block Instrument (Push Button Type) This instrument is only suitable for use in non AC electrified sections. This instrument is safe for use of block circuits subjected to maximum induction 650Vr.m.s. 50 cycles AC from neighboring power line provided the existing DC blocking condenser in the telephone circuits is replaced by a one rated for 1000V DC for non AC section only (non AC electrified).

e) Maximum acceptable limit of induced voltage due to power parallelism is up to 2000V on railway block and communication circuits subject to the specific limitations mentioned above.

The cases of induced voltages above these limits should be treated as re-engineering cases and each such case should be treated separately in consultation with the Railway Board.

2.9 Railway control and other overhead circuits to be invariably provided with GD tubes on par with the protective arrangements required for protection of block circuits.

2.10 Interference to signaling circuits shall be checked up with reference to the A.C. immunity of the signaling equipment viz., track circuit relays, line relays, point machines etc. Interference voltages to signaling circuits are not provided by PTCC and will have to be done by the Railways in specific cases where interference is suspected.

2.11. After calculation of induced voltages, divisions shall be advised of the protective measures to be taken and final clearances for energization of power lines shall be given only after provision of protective measures is completed wherever necessary.

2.12 Divisions shall ensure that protective measures are maintained properly. During inspections, the availability of the protective measures at the stations shall be checked.

2.13. The expenditure for provision of the protective measures shall be deposited by the agency which carries out erection of the new power lines.

2.14. Code of practice for the protection of telecommunication lines at crossings with overhead power lines other than electric traction circuits is contained in chapter VI of the PTCC manual and is to be followed in all cases of new power lines crossing the overhead alignments in use on Railways, either on lease from BSNL or Railways own.

Guarding arrangements shall be provided for crossings of up to 36KV and the detailed drawings for separations to be followed as per the code of practice shall be followed.

The minimum clearances between the extra high voltage lines (above 36 KV) and telecommunication wires as per the above code of practice shall be:

For lines of voltage above: 36 KV up to and including 72.5 KV = 2440 mm(80)

For lines of voltages above 72.5 KV up to and including 145 KV = 2740 mm(90)

For lines of voltage above 145 KV up to and including 245 KV = 3050 mm(100)

For lines of voltage above 245 KV = 3050 mm (100) Plus 305mm (1foot) for every additional 33 KVor part thereof.

2.15. Method for carrying out low frequency induction test if required, and code of practice for protection from earth potential rise (EPR) are described in the PTCC manual. It should be ensured that the EPR at locations of telephone exchanges, cable joints, terminals, pillars, cabinets etc., is within safe limits. The EPR counters which define hazard zone for telephone plants are given below:

S.No. Type of Telecom Plant Type of Power System High Reliability

Lines Other Lines

1. Terminal apparatus, joints, cabinets, pillars, manholes, pits, poles

650 V 430 V

2. Telephone Exchanges 430 V 430 V 3. Cables:

a) Metal Sheathed b) Plastic insulated and plastic sheathed.

650 V 7 KV

430 V 7 KV

2.16. Just as clearances from the departments of Telecommunication and Ministry of Railways are required in cases of new power lines, induction effects due to existing power lines shall be evaluated before erection of new overhead alignments for telecommunications. However, erection of new overhead alignments for telecommunication is no longer followed by Department of telecommunication or by the Ministry of Railways or Ministry of Defense.

2.17. PTCC Monitoring cell headed by CCE/DyCSTE(Tele) of the railway shall monitor the timely disposal of pending and new cases. The cell shall maintain the concern data on PC with the help of nominated official/supervisor.

2.18. Further details are available in PTCC Manual published by Power & Telecommunication Co-ordination Committee. The information is available on www.tnd.bsnl.co.in/ptcc/ptcc.htm.

2.19. Further information on this subject is available in ITU-T: Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines, ITU, Geneva, 1990.

Annexure - A

COMPOSITION OF THE COMMITTEE AT CENTRAL LEVEL:

i) Chief Engineer(LD&T), Central Electricity Authority - To be chairman in New Delhi alternate years

ii) Chief General Manager, T&D Circle - To be chairman in Department of Telecom, Jabalpur alternate years

iii) Director(PTCC), - Secretary(PTCC) Central Electricity Authority, New Delhi C.E.A

iv) Director/Telecom, Railway Board - Member

v) Director (GP), Telecom Directorate - Member

vi) Director (ML), Telecom Directorate - Member

vii) TEC, Department of Telecom - Member

viii) Chief General Managers of BSNL - Member of respective circle

ix) DDG(T), Director/Signals - Member Army Headquarters

Annexure - B

COMPOSITION OF THE COMMITTEE AT STATE LEVEL:

1) Deputy General Manager of Telecom Circle/Superintending Engineer of - Chairman Electricity Board (in alternate years)

2) Asst. Engineer (PTCC) of T&D Circle - Secretary

Communication Side: 3) AGM/Planning in-charge of PTCC - Member

4) DET(PTCC) of the Region - Member

5) DSTE of Zonal Railways - Member

6) Army representative of the area - Member DCSO/Colonel Signals of respective Commands

7) Officer dealing with PTCC matters from Metro & all major telephone - Member districts and MTNL, preferably of DE rank

8) Any other representative from DOT side as a special invitee as per require- - Member ment of the meeting such as Area Directors of big circles.

Power Side: 9) Zonal SE/EE in charge of O&M - Member

10) Representative of any other Power organization in the state such as - Member NTPC, NHPC etc.

State Government Representative: 11) Chief Electrical Inspector of the state - - Member or his nominated representative

CHAPTER III

Role of WPC and SACFA Clearances

3.1. INTRODUCTION:

3.1.1 WIRELESS PLANNING & COORDINATION WING.

The WIRELESS PLANNING & COORDINATION (WPC) Wing of the Ministry of Communications, created in 1952, is the national radio regulatory authority responsible for frequency spectrum management, including licensing and caters for the needs of all wireless users (government and private) in the country. It exercises the statutory functions of the Central Government and issues licenses to establish, maintain and operate wireless stations. WPC is divided into major sections like Licensing and Receival (LR), New Technology Group (NTG) and Standing Advisory Committee on Radio Frequency Allocation (SACFA). SACFA makes the recommendations on major frequency allocation issues, formulation of the frequency allocation plan, making recommendations on the various issues related to International Telecom Union (ITU), to sort out problems referred to the committee by various wireless users, Siting clearance of all wireless installations in the country etc.

3.1.2 The Standing Advisory Committee on Radio Frequency Allocations (SACFA) is a high level committee chaired by Secretary (DOT)/Chairman, Telecom Commission. Heads of major wireless users/administrative ministries of the Govt. of India, Member (Technology), Telecom Commission, and Wireless Adviser to the Govt. of India, Joint Secretary, DoT are its members. WPC wing of the Ministry of Communications provides secretarial help to the committee. Joint Wireless Adviser, WPC wing is the member-secretary of the Committee.

Names and Addresses of SACFA Members

Name & Designation

Deptt.

Address for communications E-Mail/Fax/Tele.

Engineer-in-Chief

All India Radio Room No.141, Akashvani Bhavan Parliament Street, New Delhi - 110 001.

[email protected] 2341459/23421058 23421062

Engineer-in-Chief

Doordarshan

Room No.502, Doordarshan Bhavan, Copernics Marg, New Delhi - 110 001.

[email protected] 23387380/23388113

Director

JCES Cabinet Secretariat, Military Wing, Room No.34, Plot No.108, Church road, New Delhi.


Addl. Director General(T.T)

Army Hqrs. Room No.634, A-Wing ,Sena Bhavan, New Delhi - 110011.


Director (Signals)

Naval Hqrs. Room No.33, Sena Bhavan, C- Wing, New Delhi 110011


Principal Director(Sigs)

Air Hqrs. Room No.514, Vayu Bhavan, New Delhi 110011

[email protected] 23011051/23010231 23017514 23016517

Sr. DDG(TX)

BSNL 601, Statesman House, B-Wing, Barakhamba Road, New Delhi - 110 001.


Director

DCPW Room No.300, Block No. 09, CGO Complex, Lodhi Road, New Delhi 110003.


Executive Director (Telecom)

Ministry of Railways

Room No. 152 , Railway Board, Rail Bhavan, New Delhi - 110 001.


General Manager (ATM)

AAI Room No. 128, Rajiv Gandhi Bhavan, Safdarjung Airport, New Delhi - 110003.


Director (Electronics)

Light house and light ships, Ministry of Transport

A-13, Deep Bhaan, Sector 24, NOIDA, (UP), Pin: 201301

[email protected] 95120 - 2524093

Director General IMD Room No.606, Mausam Bhavan, Lodhi Road, New Delhi-110003.


Director DOS Room No.304, Antariksh Bhavan, ISRO Hqrs. Frequency Management, New Bel Road, Bangalore 560094.


Chief Engineer (E&T)

ONGC 12th Floor, Scope Minar Laxmi Nagar, Vikas Marg, New Delhi - 110092.


Sr. Director Deptt. of Information Technology

Room No.4003, Electronics Niketan, 6, CGO Complex, Lodhi Road, New Delhi. 110003.

24363095/24363133

DDG NIC Room No.227, NIC Building, CGO [email protected]

Complex, Block-A, Lodhi Road, New Delhi-110003.

24361475/24361635

Director (WM) Wireless Monitoring Organisation (DOT)

Room No. 321 , Wireless Monitoring Organization, E-Wing, Pushpa Bhavan, New Delhi 110062.


Off. Director CMO, Ministry of Defence

Room No. 105, M- Block, CMO, Ministry of Defence New Delhi.

23011535/23011439

DDG(R), TEC DoT TEC, Khursheed Lal Bhavan, New Delhi-110 001.

23329333

Joint Wireless Adviser Secretary, SACFA

WPC WING 607, Sanchar Bhavan, New Delhi - 110 001.


3.1.3 The main functions of the committee are to make recommendations on:-

Major frequency allocation issues, Formulation of National Frequency Allocation Plan, Making recommendations on various issues related to International

Telecommunications Union (ITU), Asia Pacific Telecommunity (APT), To sort out the problems referred to the committee by various wireless users,

siting clearance of all wireless installations in the country, etc.

3.1.4 SACFA clearances are issued after getting 'no objection' from various SACFA members who have to carry out detailed technical evaluation including field surveys, etc. At times they have to obtain evaluations from their field units. The technical evaluation is done primarily for-

a) Aviation hazards.

b) Obstruction to line of site of existing/planned networks

c) Interference (Electro Magnetic Interference (EMI)/Electro Magnetic Compatibility (EMC)) to existing and proposed networks.

3.1.5. SACFA Monitoring cell headed by CCE/Dy.CSTE(Tele) of the railway shall monitor the timely disposal of pending and new cases. The cell shall maintain the concern data on PC with the help of nominated official/supervisor. Since WPC is switching over the SACFA clearance procedures such as filing of applications, issue of IDs, etc., on line, these staff should be trained to work on line. The clearance for SACFA is on the

software system namely Automated Spectrum Management System provided by WPC for speedy handling.

3.2. CATEGORIES OF SITES FOR WIRELESS STATIONS:

3.2.1 Mast Height Category:

3.2.1.1 Sites for HF/VHF/UHF:

Those fixed wireless stations whose mast/tower height do not exceed 30 meters above ground level and are operating in certain frequency bands with limited output power as given below are covered under this category:

(a) All HF stations with power output of 125 watts or less.

(b) (i) All VHF stations below 174 MHz with power output of 50 watts or less except broadcast stations.

(ii) All VHF stations in the frequency range 174-230 MHz with output power up to 25 watts except broadcast stations.

(c) Broadcasting stations in the band 30 - 230 MHz with an output power output up to 100 watts.

(d) All VHF/ UHF stations with a power output of 10 watts or less.

Siting Applications of the above wireless stations are to be forwarded to the members of SACFA listed in Annexure-I in the application form (WPC S-1).

3.2.1.2 Sites for V-SAT/ Micro-Earth Stations (C-, Extended C and KU bands) with power output up to 5 watts:

(A) Antenna size- up to 4.0 Meters:

In case the total height of antenna including support structure is 30mteres or less from the ground level, the siting application need to be processed under Mast Height Category and Siting applications need to be circulated to members of SACFA as per Annexure -IV using the proforma (WPC S-4).

(B) Antenna size- More than 4.0 Meters:

If the antenna height is more than 4 metres but less than 20 metres AGL and the distance from airport reference point is less than 7 kms, clearance need to be obtained from Army Hqs., Air Hqs., Naval Hqs., JCES and AAI under Mast Height Category. If the distance of the site is more than 7 km from airport reference point and antenna height is less than 20 metres 'no objection' is to be obtained from AAI only. The siting applications of the above stations may be forwarded to SACFA members as per list at Annexure- IV in application form (WPC S-4).

3.2.2 Exemption from Mast Height Clearance:

3.2.2.1 Sites for HF/VHF/UHF:

Those mast height cases which satisfy the following conditions are exempted from mast height clearance:- (i) Antenna mast should be installed on the rooftop of the building.

(ii) The height of mast including antenna to be installed on the rooftop should not be more than 3 meters.

(iii) The site should be at least 3 KM away from the nearest airport.

3.2.2.2 Sites for V-SAT, Micro-Earth Stations ( C, EXTENDED C & KU bands with power output upto 5 watts:

(A) Antenna size- 1.8/ 2.4 Meters:

If the antenna is to be installed on the rooftop of an existing building with mast height not exceeding 3 metres from rooftop and which is at least 3 kms away from the nearest airport 'no objection' from Department/Organization may not be necessary. These cases will be processed under Mast Height Exemption Category. The site details are to be furnished to Secretary SACFA in the Mast Height (VSAT) application proforma (WPC S-4).

(B) Antenna size- More than 2.4 Meters and up to 3.8 meters:

If the antenna diameter of VSAT is more than 2.4metres and upto3.8metres and antenna height up to 4 metres above ground level beyond the distance of 7 km from airport reference point (ARP) 'no objection' from any of the Departments may not be necessary. These cases will be processed under Mast Height Exemption (VSAT).

3.2.2.3 The procedure for fast-track clearances of applications for mast height exemption is given in Annexure IX

3.3 Full Siting Category:

The following fixed stations are covered under the full siting category:

3.3.1 (a) All HF stations with power output more than 125 watts.

(b) (i) All VHF stations below 174 MHz with power output more than 50 watts.

(ii) All VHF stations in the frequency range 174-230 MHz with power output more than 25 watts.

(c) Broadcasting stations in the frequency band 30-230 MHz with power output more than 100 watts.

(d) All UHF stations with power output more than 10 watts

3.3.2 Station in microwave, line of sight, radio-relay systems.

3.3.3 All radar stations, Satellite Communication System (including Earth stations), radio navigation and radio location system.

3.3.4 All VSATs / micro-earth stations with transmitter power more than 5 watts

3.3.5 Receiving stations in services like Space Research, Radio astronomy and other sensitive receiving systems operating above 1 Ghz.

3.3.6 Any other change in existing parameters other than reduction in power and mast height of the approved parameters.

The siting applications for the above stations are to apply to members as per list at Annexure-II in application form (WPC S-2).

3.4 Additional Antenna Category:

3.4.1 Sites for HF, VHF, UHF and Microwave:

All those antennae which are to be installed on the existing mast, already cleared under full siting category, fall under this category. The application is to be circulated to all SACFA members as per Annexure -III in the application form (WPC S-3) but the site is cleared by SACFA Sectt after ensuring receipt of applications by all members of SACFA except cases falling under DIZ area for which clearance from JCES is necessary.

Wherever tower space is being leased to private operators, either by railways directly or through RCIL, the application shall be processed by the operator quoting the full siting clearance approval obtained by the railways.

3.4.2 Sites for Earth Station:

The Earth Station dishes within 50 mts. from an already cleared site may be treated under this category provided the height of proposed installation, including, building height does not exceed the height of already cleared site/mast.

3.5 The procedure for fast-track clearances of applications under additional antenna category is given in Annexure-X.

4. GUIDELINES FOR FILLING UP SITING APPLICATIONS:

4.1. Application forms for all categories of siting may be obtained from SACFA secretariat and necessary information may be furnished keeping in view the following:-

(i) Six digit coordinates of the site are necessary. These six figure coordinates may be taken with the help of GPS system or any other method for accuracy.

(ii) The height of the site above mean sea level (AMSL) should be obtained from Survey of India or any other agency except in the case of additional antenna category for which a copy of the earlier SACFA clearance and AAIs clearance for that site is mandatory.

(iii) Name of the nearest airport and its distance from the site should be mentioned in the application for categories of siting. This information is also supplied by survey of India on demand.

(iv) If the site is within 5 kms from the airport then the site map should be authenticated by either the nearest airport authority or any other government organization such as municipal corporation/local town planning committee, etc distance of the site from airport may also be authenticated.

(v) (a) The map should be of scale of 1 cm = 1 km or nearest and should cover an area of 12 kms radius around the site.

(b) The following should be marked clearly on the map:

(i) scale of the map (ii) location of the site (iii) name and geo-coordinates of the site

(c) Map should contain at least two parallel lines of latitude and longitude.

(vi) Geo-coordinates of the site on the map should be authenticated by the applicant himself.

4.2 Applications hard copy along with soft copy on a floppy of 3.5"be submitted for examination, verification and issue of ID Nos. to SACFA secretariat. Software is available from SACFA Secretariate.

4.3 Not more than 5 applications should be submitted in one bunch.

4.4 Separate application forms are to be filled for different frequency band and different site.

4.5 After issue of ID Nos., siting application is to be circulated as per list applicable to each category of siting clearance. A forwarding letter issued by SACFA is also to be attached with the siting application.

4.6 The applications for additional antenna category need to be circulated to all members of SACFA but no NOC from any member is necessary for approval of site except sites which fall in DIZ area for which NOC from JCES is necessary.

4.7 A copy of the agreement letter assigning the frequencies from WPC should be attached with application.

4.8 A copy of DOTs license agreement may also be endorsed in case of value added service.

5.0 CLEARANCE OF SACFA CASES FROM RAILWAYS

On receipt of the proposal for site clearance the following aspects have to be checked from railways activity point of view:

5.1 FREQUENCY: The frequency of the proposal and the band at which it is proposed is to be cross checked with the allotted frequencies and frequency bands of Railways and clearance can be given if it is not interfering with Railway frequency.

In case if the proposal frequency and band are adjacent to the railway working frequency a condition has to be imposed in the no objection certification that permission is given provided the transmission wont interfere with the railway frequency.

5.2 SITE: The Longitude and Latitude of the proposed site has to be cross checked with the existing Longitude and Latitude of the railway communication site. If the Longitude and Latitude are very near to the railway site, the locations have to be physically checked on the topography map for clearance of signal.

5.3 TOWER HEIGHT: When the proposal is near to Longitude and Latitude for the railway site then the tower height proposed has to be cross checked for any interference in the path of the railway communication.

5.4. TRANSMITTER POWER: The transmitter power of the proposal has to be cross checked whenever the proposal is nearer to the railway site and a conditional certificate should be given for avoiding spurious signal from the transmitter.

6. Further information on the role of WPC and SACFA and the procedures to be followed can be obtained from www.wpc.dot.gov.in.

ANNEXURE-I

List of SACFA members to whom the application for Mast Height (general)

Category needs to be circulated

Name & Designation Deptt.

Address for communications Number of copies

To be sent Addl. Director General (TT))

Army Hqrs. Room No. 634, A-Wing ,Sena Bhavan, New Delhi 110011.

02

Director (Signals)

Naval Hqrs. Room No.33, Sena Bhavan, C- Wing, New Delhi 110011.

02


Air Hqrs. Room No. 514, Vayu Bhavan, New Delhi 110011.

02


AAI Room No. 128, Rajiv Gandhi Bhavan, Safdarjung Airport, New Delhi 110003.

02


WPC Wing Room No 607, Sanchar Bhavan, New Delhi - 110 001.

02

Director

JCES Cabinet Secretariat, Military Wing,Room No. 5, Plot No.108, Church Road, New Delhi.

01

Director General IMD Room No. 606, Mausam Bhavan, Lodhi Road, New Delhi-110003

01

ANNEXURE II

List of SACFA members to whom the siting application under full siting category need to be circulated

Name & Designation

Deptt.


To be sent

Engineer in Chief All India Radio Room No.141 Akashvani Bhavan Parliament Street, New Delhi - 110 001.

01

Engineer in Chief Doordarshan

Room No.502 Mandi House Copernics Marg, New Delhi - 110 001.

01

Director JCES Cabinet Secretariat, Military Wing,Room No. 34, Plot No.108, Church road, New Delhi.

01

VSM, Addl. Director General (TT)

Army Hqrs. Room No.634, A-Wing ,Sena Bhavan, New Delhi 110011.

04

Director (Signals)

Naval Hqrs. Room No. 33, Sena Bhavan, C- Wing, New delhi 110011

01


Air Hqrs. Room No.514, Vayu Bhavan, New Delhi 110011.

01

Sr. DDG (TX) BSNL Room No.601, Statesman House, Barakhamba Road, New Delhi - 110 001.

02

Director


04



Room No. 152, Railway Board, Rail Bhavan, New Delhi - 110 001.

A list of sites circulated to the concerned Rly. zones


AAI

No.128, Rajiv Gandhi Bhavan, Safdarjung Airport, New Delhi - 110003.

01

Director (Electronic)

Light house and light ships,

A-13, Sector 24, NOIDA, Gautam Buddha Nagar.

01

Name & Designation

Deptt.


To be sent

Ministry of Transport

UP - 201301.

Dy. General Manager (TP)

VSNL Room No.400, 4th Floor, Videsh Sanchar Bhavan, M.G. Road, Fort, Bombay-400001.

01

Director General IMD Room No.606, Mausam Bhavan, Lodhi Road, New Delhi 110003

01

Director DOS Room No.304 , Antariksh Bhavan, ISRO Hqrs., Frequency Management, New Bel Road, Bangalore 560094.

01

Chief Engineer (E&T)

ONGC 12th Floor, Scope Minar, Laxmi Nagar, Vikas Marg, New Delhi 110092.

03

Sr. Director Deptt. of Information Technology

Room No.4003, Electronics Niketan, 6, CGO Complex, Lodhi Road,New Delhi 110003.

01

DDG NIC Room No.227, NIC Building, CGO Complex, Block-A, Lodhi Road, New Delhi 110003.

01


Room No 321, Wireless Monitoring organization, E-Wing, Pushpa Bhavan, New Delhi 110062.

01


WPC WING Room No 607, Sanchar Bhavan, New Delhi - 110 001.

02

ANNEXURE -III

List of SACFA members to whom the siting application for additional antenna category needs to be circulated



To be sent Engineer-in-Chief

All India Radio Room No.141, Akashvani Bhavan Parliament Street, New Delhi - 1101.

01

Engineer-in-Chief

Doordarshan

Room No. 502, Mandi House, Copernics Marg, New Delhi 11.

01

Director


01

Addl. Director General (TT))


01

Director (Signals)


01



01

DDG(TX) BSNL Room No. 601, Sanchar Bhavan, 20, Ashoka Road, New Delhi - 110 001.

02

Director


01



Room No.152, Railway Board, Rail Bhavan, New Delhi - 110 001.

01



01

Director (Electronics)

Light house and light ships, Ministry of Transport

A-13, Sector 24, NOIDA, Gautam Buddha Nagar, UP 201301.

01



To be sent


01

Director DOS Room No. 304 , Antariksh

Bhavan, ISRO Hqrs., Frequency Management, New Bel Road, Bangalore - 560094

01

Chief Engineer (E&T) ONGC 12th Floor, Scope Minar, Vikas Marg, Laxmi Nagar, New Delhi-110092.

01

Sr. Director Ministry of Information Technology

Room No4003, Electronics Niketan, 6, CGO Complex, Lodhi Road, New Delhi 110003.

01

DDG NIC Room No.227, NIC Building, CGO Complex, Block-A, Lodhi Road, New Delhi 110003.

01


Room No 321, Wireless Monitoring organization, E-Wing, Pushpa Bhavan, New Delhi 110062.

01



02

Annexure-IV

List of SACFA members to whom the application for mast height clearance (V-Sat) needs to be circulated


Address for communication Number of copies

To be sent Addl. Director General (TT))


02

Director (Signals)


02



02



02



02

Director


01


01

ANNEXURE-V WPC S-1

Application form for Mast Height (General)

1 ID number and date

2 Name of Applicant

3 Address of applicant

4 Transmitter power (in watts)

5 Frequency/Frequency band of operation

6 Antenna location

7 Lattitude/longitude (six digit)

8 Height of site above mean sea level

9 Height of antenna mast above ground (building height to be included if it is to be installed on the roof top)

10 Height of building

11 Name of the nearest Airport

12 Distance of the site from the nearest airport

13 Location map with boundary reference

14 Ministrys reference with date vide which frequencies earmarked (A copy of agreement to be attached)

15 Remarks

Signature of Applicant

ANNEXURE-VI

WPC S2 Application form for Full Siting Category

( Signature of Applicant )

1 Service


3 Name of Applicant

4 Address of Applicant

5 Transmitter power (in watt)

6 Frequency/Freq. band of operation

7 Antenna location

7 Latitude and longitude (six digit)


10 Height of antenna mast above ground level

11 Height of building if antenna is to be installed on the roof top

12 Type of antenna and its size

13 Azimuth of maximum radiation

14 Gain of Tx. Antenna (db)

15 Gain of Rx antenna (db)

16 Beam width (in degree)

17 Name of the nearest airport


19 Receiver location

20 Nature of service

21 Circuit/hop length

22 Approx. area covered by antenna location

23 Service area

24 Location map

25 Ministry's reference and date

26 DOT agreement number and date, if required

27 Remarks

ANNEXURE-VII WPC S-3

Application form for Additional Antenna Category

1 Service


3 Name of Applicant

4 Address of Applicant

5 Transmitter power (in watt)

6 Frequency/Freq.band of operation

7 Antenna location

8 latitude and longitude(six digit)


10 Height of antenna mast above ground level

11 Height of building if antenna is to be installed on the roof top



14 Gain of Tx. Antenna (db)


16 Beam width (in degree)

17 Name of the nearest airport

18 Distance from the site

19 Receiver location

20 Nature of service

21 Circuit/hop length

22 Approx .area covered by antenna location

23 Service area

24 Location map

25 Ministry's reference and date

26 DOT agreement number and date

27 Earlier SACFAreference vide which site cleared

28 Remarks

( Signature of Applicant )

ANNEXURE-VIII WPC S-4

Application form for Mast Height (VSAT)


2 Name of Applicant

3 Address of applicant

4 Transmitter power (in watts)

5 Frequency/Frequency band of operation

6 Antenna location

7 Latitude/longitude (six digit)


9 Height of antenna mast above ground (building height to be included if it is to be installed on the roof top)

10 Height of building



13 Gain of Tx antenna (db)


15 Name of the nearest Airport


17 Location map with boundary reference

18 Ministrys reference with date vide which frequencies earmarked (A copy of agreement to be attached)

19 D o T agreement number and date

20 Remarks

Signature of Applicant

ANNEXURE-IX F.No. K-19012/Misc./2005-CFA

Government of India Ministry of Communications & IT

Department of Telecommunication WPC Wing

Sanchar Bhavan New Delhi-110001

Dated: 27th July, 2005.

OFFICE MEMORANDUM

Sub: Simplified procedure for sites falling under Mast Height Exemption Category.

In case of sites for VSATs and other masts/antennae for various applications falling under Mast Height Exemption Category, the following procedure comes into force with immediate effect.

2. For the sites falling under Exemption from Mast Height Clearance, the applications are to be filed online like other SACFA siting applications. Signed hard copies along with the details of ID numbers and the required amount of Bank Draft be submitted to SACFA Secretariat.

3. In addition, a consolidated list of such sites along with the details as per the prescribed format (Annex-1) are to be submitted in duplicate.

4. An earnest money of Rs. 1000/- (Rupees One thousand only) per site in the form of State Bank of India Demand Draft, drawn in favour of The Pay & Accounts Officer ( HQrs), Department of Telecommunications, payable at New Delhi, is required to be submitted.

5. An undertaking as per Annex-2 shall also be submitted by the applicant.

This procedure supersedes all earlier OMs in this regard.

s/d

(D.SINGARAVELU) Deputy Wireless Adviser

to the Government of India

Annex-1 .

Details of VSATs and other masts/antennae sites under SACFA Mast Height Exemption Category

1. Name, address of the Organisation /VSAT Service Provider : Tele & Fax No. : E-mail address :

2. Name of the Hub Station for the network: Reference of WPC Licence No./ : Decision letter for the network : (for masts/antennae of other applications this is not applicable)

SACFA

ID

Location/address of VSAT/ mast

Location Longitude

Location Latitude

Frequency band of operation

Size of Antenna/ VSAT

AMSL (meters)

Height of Building above ground (meters)

Name of the nearest airport

Distance of the airport from the site (KMs)

Annex-2

UNDERTAKING

Whereas M/s.__________________________________, a company incorporated under the Companies Act, 1956, having its registered office situated at ______________________ is a provider of VSAT Service.

AND for the purpose of VSAT Service, M/s. ______________________________ as aforesaid applied for Licence / permission from Government of India on its own volition and has agreed to abide by terms and conditions relating to the VSAT licence etc.

AND the M/s.________________________________ has installed VSAT stations some of which fall under SACFA Exemption Category, full details and Particulars of which are given above (in Annex-I appended hereto).

I, ________________________, Son/Daughter of Shri_________________, resident of _________________________________ and Owner/Managing Director/Director/Partner/Authorised Signatory; for and on behalf of the above said company do hereby undertake that all the VSATs as detailed above (in Annex-I) have antenna size up to 2.4 meter diameter and use RF Power up to 5 watts.

I further undertake that all the terms and conditions framed regarding VSATs will be fully observed, and in the event of any violation of such terms and conditions or furnishing of wrong information above (in Annexure I) or otherwise, I and M/s. _____________________________________shall indemnify jointly and severally the WPC Wing, Department of Telecommunications (DOT) against all third party claims and shall accept full responsibility and liability for the same, including any penalty or, dismantling of the VSAT (at our cost) and / or cancellation of the wireless licence, as decided by the WPC Wing, Department of Telecommunications.

Signed on _________day of __________________Two thousand Five by Shri ______________________ holder of General Power of Attorney executed pursuant to the Board resolution dated _____________________.

Date: (Signature) Place: (Name & Designation of the Authorised Signatory) (Name & Address of the Service Provider Company) In the present of Witnesses:

1.

2.

(Note: For masts/antennae for other applications, the Undertaking may be modified accordingly)

ANNEXURE-X Fast track site clearances for additional antennae

K-16011/05/2002-CFA

Government of India Ministry of Communications & Information Technology

Department of Telecommunications Wireless Planning and Coordination Wing

223-B, Sardar Patel Bhavan, Parliament Street, New Delhi 110001

Date: 03.07.2002

OFFICE-MEMORANDUM

Subject:Fast track site clearances for additional antennae

Kindly refer to agenda item no. 5 of Summary Record of 137th meeting of SACFA held on 28.05.2002 where BSNL representative informed pendency of their cases for additional antennae despite involvement of less number of SACFA members. After detailed discussion, it was decided that no NOC (s) from SACFA members will be required for siting cases falling under additional antenna category. However, siting applications are to be circulated to all members of SACFA and their receipt is to be ensured. After ensuring receipt of such cases, SACFA Sectt. will issue necessary clearances for sites falling under additional antenna category.

The following modified procedure for additional antennae cases will be followed in future-

Applicant will apply to SACFA Sectt in a prescribed proforma available with SACFA Sectt for which softcopy may be obtained from SACFA Sectt for obtaining ID numbers. Applicant will enclose a copy of earlier SACFA clearance, NOC received from AAI with regard to site under consideration if site was cleared after 1995 and appropriate map indicating the site. Applicant will be issued ID numbers after scrutinizing applications for correctness. When applicant informs SACFA about likely date of circulation of siting applications, he will be issued circulation letter meant for all members of SACFA, which he will attach with applications and circulate within a weeks time. Applicant will obtain acknowledgement slip in token of receipt of his applications by SACFA members. Applicant has to submit a copy of frequency agreement letter issued by WPC at the time of obtaining SACFA clearance. Applicant will be issued SACFA clearance within a short time after confirming receipt of applications through receipts --SD--- ( Deepa Aggarwal ), Assistant Wireless Adviser For, Secretary, SACFA

CHAPTER IV

COMMUNICATION REQUIREMENTS FOR NEW STATIONS

4.1 Opening of new stations whether in an already existing line or as part of a new section shall be governed by Rules for opening of a Railway.

4.2 Communication systems for new sections shall be planned on underground cable only. Suitable system to meet the future communication requirement of the section shall be planned. Adequate capacity shall be built in to meet the safety requirements of block working, TAWD, BPAC, emergency requirements for accident communication etc.

4.3 Communication arrangements at a new station shall be governed by: a) Controlled / Uncontrolled section. b) Electrified/Non-electrified section. c) Importance in terms of the various departmental staff to be Posted at the station.

4.4 The following communication arrangements shall be provided at new stations:

a) Control telephone in controlled sections. b) Phone communication to all manned level crossing gates controlled

from the station. c) 25W VHF sets with proper standby power supply. d) Communication arrangements with sidings. Mode of communication shall

be decided by the Railway administration, depending on the importance of the siding.

e) BSNL phone wherever feasible. In the absence of feasibility for land line BSNL phone, wherever WLL phone is feasible, it shall be provided.

f) In new sections, telephone exchange shall be provided at important stations where there is a sizeable establishment for railway working. Wherever feasible, such exchanges shall be connected by suitable means to the divisional exchange.

g) In all new sections, S&T controls shall be provided connecting SE/JE (S&T)Offices and residences of Technicians (S&T) etc. This shall however be subject to availability of channel in the main communication system.

h) In all new sections, Engg. Control shall be provided connecting SE/JE ( P.Way ) offices and residences. This shall however be subject to availability of channel in the main communication system.

i) In a new section, communication arrangements for block working to suit the system of working to be followed shall be provided.

j) In electrified territory, TPC phone shall be provided.

4.5 Additional communication facilities be provided in new electrified sections, shall be governed by the provisions in Chapter - IV of the 25KV AC traction manual.

4.6 All the communication equipments shall be provided with suitable power supply arrangements and proper protective arrangements.

4.7 All the communication equipments and power supply units shall be properly earthed.

4.5 Besides telecommunication facilities, one or more of the following facilities are to be provided depending on the importance of the station. a) Platform clocks. b) PA systems for announcements on the platforms. c) Rly and BSNL Telephones for Train Enquiry Communication. d) IVRS systems. e) Train Indication Board as per Railway Boards guidelines.

CHAPTER V

TRAIN TRAFFIC CONTROL

5.1 GENERAL

5.1.1 RAILWAY CONTROL CIRCUITS: Railway Control Circuits are omnibus telephone circuits which provide communication with each train working point, thus facilitating efficient train operation. They should provide satisfactory and reliable communication between the controller and the various way-side stations, important signal cabins, loco sheds, yard offices etc.

5.1.2. TYPE OF CONTROL SYSTEM: According to traffic requirements and to cater to the needs of Electric Traction area, a section may be provided with one or more Railway Control Circuits as detailed below :

a) SECTION CONTROL / TRAIN CONTROL : This is provided for communication between the Section/Train Controller in the control office and way-side stations, junction station, block cabins, loco sheds and yards in a division for the control of train movements and effective utilisation of section capacity.

b) DEPUTY CONTROL : This is provided for communication between the Deputy Controller in the control office and important stations, junctions & terminal stations, yard master's offices, loco sheds and important signal cabins in a division for supervisory control of traffic operation in general.

c) STOCK / ADM. CONTROL: This is provided for communication between the Stock/Adm. Controller in the control office and yard master's offices at junctions and terminal stations in a division for getting information on the movements of rolling stock.

d) LOCO POWER CONTROL : This is provided for communication between the Loco Power Controller in the control office and the various loco sheds, important stations and yards in a division for the optimum utilisation of the locomotives.

e) TRACTION LOCO CONTROL : Provided between traction loco controller and loco sheds, important Station Master's Offices for optimum utilisation of electric locomotives.

f) TRACTION POWER CONTROL : Provided between traction power controller and SM's Office, FPs/SPs/SSPs for maintenance of OHE system.

g) S&T CONTROL : Provided between test room and way stations for effective maintenance of S&T equipments.

h) EMERGENCY CONTROL: Provided from selected points along the track route for establishing communication between train crew (in case of emergency), traction and permanent way staff with traction power controller. The emergency sockets are provided on rail posts at an interval of 1 Km (Max.) along the route. They are also provided at FP/SP/SSPs isolators in yards and near bridges.

i) EMERGENCY WIRELESS CONTROL COMMUNICATION: The following equipments can also be utilized for emergency wireless communication where such system exists:-

i) Handsets for Mobile Train Radio Communication (MTRC) in sections. ii) Walkie-Talkie sets in sections where VHF communication from train to

control office has been provided in lieu of any physical medium or MTRC.

Any other form of emergency wireless communication shall have the specific approval of the Railway Board

5.1.3 REQUIREMENTS FOR TRAFFIC TRAIN CONTROL SYSTEM : 5.1.4 Train Control systems shall fulfill the following requirements :-

a) Rotary keys or push buttons of non locking type shall be provided for selective calling of any station by the controller.

b) Facilities should be provided for selectively calling one or a group of stations or all stations.

c) Means shall be provided to automatically inform the controller whenever the bell/buzzer at the station rings in response to the call initiated by him.

d) The signalling used for selective calling shall not hamper normal telephone conversation on the line.

e) Feature of prolonged ringing of any way-station shall be provided.

f) Adjustment and maintenance of the equipments in the control office and way-side stations should be easy.

g) The equipment should be rugged and capable of intensive use.

h) The equipment should work satisfactorily within allowable margins of line characteristics without frequent critical adjustments.

j) The system should be capable of progressive expansion without any replacement.

k) The system should be compatible with overhead alignment and underground cables as applicable.

l) Provision of intercommunication facility between several controllers in the same control office may be incorporated in the control key board/panel wherever necessary.

m) Earth return circuits shall not be retained on AC traction and all Telecom circuits shall work on metallic return.

n) Facility shall be provided in control office for transferring Emergency Control(wherever exists) to Section Control circuit.

o) No overhead telecom alignment shall be within 50 meters from the AC electrified track except when running strictly at right angles.

5.1.4 INTERCOMMUNICATION BETWEEN LOCAL TELEPHONE AND CONTROL CIRCUIT

a) It is also desirable to make provision of an approved type to interconnect the local telephone exchange with important control circuits to enable important officials served by the local telephone exchange to gain access to such control circuits with or without the assistance of an operator.

b) Such a provision shall not affect the performance of the control circuits from the point of view of signalling or speech.

c) Whenever interconnection is made through an operator, the manual board shall be provided with necessary supervisory facilities so that the telephone connected to the exchange is disconnected from the control circuit as soon as the conversation is over.

d) It should be ensured that only important officials have access to control circuits in this manner.

5.1.5 TYPES: Traffic Control Equipments shall be of the following or any other approved type.

(a) STC KEY SENDING SYSTEM: In this system the coded impulses are generated by means of a rotary selector key (4001-A, 4002-A & 4002-B) mounted in a key case being turned at a time to call any particular station. The impulses are received at the way stations by polarized relays or selectors (4301-A) adjusted to close the contact for the local ringing circuit for a particular code.

(b) PUSH BUTTON SENDING SYSTEM : The Push Button Sending System consists of a push button panel and an impulsing unit in the control office. The panel is equipped with 16 push buttons, and any particular station being called by operating 2 buttons corresponding to the first two digits of the code. For prolonged ringing, the long ring key is operated. All stations can be signalled simultaneously by pressing a general call key.

(c) DUAL TONE MULTIFREQUENCY SYSTEM: In this system two frequencies are being transmitted simultaneously as per the standard DTMF Frequencies plan given in Annexure-II with 2 digit code to call either one station at a time or a nominated group at a time or all at the same time.

The first two types are now obsolete and hence will not be described further. Moreover as per policy of Board all overhead alignment system of BSNL as well as Railways should be replaced in phased manner by 2008. However in extreme circumstances where it is required the same should be followed as detailed in old Telecom Manual (1971 edition).

5.1.6 INTERCOMMUNICATION EQUIPMENT: All controllers in a control office shall be provided with an intercommunication system of approved type with facilities for each controller to call any other controller, including Deputy Controller, Chief Controller and the Telecommunication Maintainer/Inspector on duty.

5.1.7 JUNCTION EQUIPMENT: When control circuits originate in electrified section and extend to a non-electrified section or vice versa 4 wire/2 wire OR 2 wire/4 wire Speech Conversion and Junction equipment as per specification IRS: TC-46 shall be provided at the junction.

5.2 SPECIAL PROVISION FOR CONTROL COMMUNICATION WITH UNDERGROUND CABLES AT REPEATER STATION: Repeater Station equipments are housed in Structural Frames and Transformer Bay.

5.2.1 STRUCTURAL FRAME: Structural frame houses

i) Miscellaneous panel ii) V.F. Amplifier panel iii) Ringing impulse amplifier panel

Structural frame for equipment bay is a frame work composed of M.S.. angles of size 40 x 40 x 6 mm and 25 x 25 x 3 mm as per the drawing No. TC-15145. Top most rack of the frame is meant for housing miscellaneous panel the requirement of which is one per repeater station. The other racks are of equal sizes and are to be distributed to house amplifier panels and ringing impulse amplifier panels. The required numbers of amplifier panels and ringing impulse amplifier panels is to be decided on the requirement of circuits required for the section.

The size of the structural frame for the equipment bay shall be 615 mm x 250 mm x 1630 mm.

It is to be installed on the channel foundation on the floor of the repeater station building. The details of channel foundation are indicated in the drawing No. RDSO/TC-35027 to 35029.

5.2.2 Miscellaneous panel: Miscellaneous panel is provided on the top most rack of the structural frame. It houses U-link panel and fuse panel. It conforms to the drawing No. RDSO/TC-33180.

(i) U-link panel : In the front of the cabinet 5 nos. of U-link panels are provided. Each U-link panel has 32 inlets/outlets. Tag strip provided on the top of the U-link panel is to be connected to the secondary of the isolation transformer in the Transformer bay and the tag strip provided at the bottom is to be connected to the tag block of the amplifier panel or terminal strip of the ringing impulse amplifier panel as the case may be. For isolating, testing and monitoring the U-link provided on the miscellaneous panel is to be used.

(ii) Fuse panel : Fuse panel has the maximum capacity of holding 4 numbers of 10 lines alarm type of fuse. To have an access of the fuse panel rear cover of the miscellaneous panel is to be opened. One fuse block 10 lines is required for each amplifier panel having nine cards. Fuse to be used shall be of 0.5A capacity. One fuse block -10 lines is required for 5 ringing pulse amplifier panel. Fuse used shall be of 1A capacity.

(iii) Cable entry : Two cable entry holes with suitable grommet are provided at the left and right of the rear cover.

(iv) Size : The overall dimensions of the panel shall be 575 mm x 253 mm x 228 mm.

(v) Accessories : The electronic hooter/buzzer shall be supplied as an accessory which is to be mounted on the maintainers table. This hooter shall be connected in such a way to sound whenever any one of the fuses blows out.

5.2.3 Amplifier Panel : The amplifier panel houses the printed circuit cards of V.F. buffer amplifier. It conforms to drawing No. TC-15150. The amplifier panel/panels are to be mounted on the rack/racks just beneath the miscellaneous panel in structural frame works of the equipment bay.

One leak amplifier card serves for two circuits so leak amplifier card shall be placed in between two VF amplifier cards for which the leak amplifier is meant.

VF Repeater Amplifier : The 4W VF Repeater amplifier is intended to make good of the losses incurred due to cable attenuation, insertion loss of sectionalizing transformer installed in cable huts. The repeater are spaced at an interval of about 50 KM.

a) The repeater provides a gain of 24 2 db in the voice frequency range. The gain adjusted in steps of one db.

b) The nominal input and output impedance of the amplifier is 1120 ohm.

c) Equalizers are provided for the correction of frequency response characteristics of the cable.

d) The frequency response shall be flat within 0.1 db in the frequency range 300 Hz to 3.4 KHz.

e) The return loss of the repeater against 1120 ohm is not less than 25 dB in the frequency range of 300 Hz to 3.4 KHz.

f) The output return loss against 1120 ohm with amplifier set for maximum gain is not less than 20 db over the frequency range 300 Hz to 3.4 KHz.

Leak Amplifiers : Two pairs of conductors are required for each control circuit, one for speaking and another for listening in order to overcome the difficulty likely to be experienced in balancing an omnibus circuit like control circuit. With a four wire circuit conversation between way stations is not possible. However with the provision of a small amplifier (Leak amplifier) at the first repeater station speech at low level is passed from the receive pair to the transmitting pair, thereby enabling the way stations to know whether the line is engaged or not. In addition, a certain amount of speech passes from the receive pair to transmitting pair through the loudspeaker and microphone making communication between way stations possible.

In all four wire control circuits excepting remote control, the leak amplifier shall be provided at the Main (First) repeater station.

a) The leak amplifier is provided with an overall loss of 20 0.5 db (fixed)

b) Nominal input impedance of the amplifier is 50K.

c) The variable 50 K pads of 1, 2, 4, 8 db induces the necessary leak into the circuit.

d) 1120 ohm pads of the value 1, 2, 4, 8 db is also provided. It is required only at the main repeater station. Control room equipments is installed in the vicinity of the main repeater station. The level of the incoming speech of the trans pair will be high. The necessary pads are also inserted to introduce required attention.

e) The frequency response shall be flat within 0.2 db in the frequency range of 300 Hz to 3.4 KHz.

f) The normal current drain for each leak amplifier shall be 1.6 mA + 0.1 mA.

5.2.4 Ringing Impulse Amplifier (RIA) Panel : This panel is provided for amplifying the ringing impulses at the intermediates repeater stations. This houses the printed cards and the allied components of ringing impulse amplifiers. The arrangement of the panel is as per Drg. No. TCA 15135. Each panel consists of two identical sets of amplifier units conforming to Drg. No. TC-15093.

Ringing Impulse Amplifier: In order to overcome the drop in signalling voltage due to line resistance, the AC 50 Hz signals interrupted at 3-1/2 cycles per second, are amplified at each repeater station with the aid of ringing impulse amplifier. Each RIA panel consists of two identical amplifier circuits to Drg. No. TC-15093.

Operational Features : An output signal of 50V, 50 Hz can be obtained for varying input signal between 7V & 42V by suitably strapping of the flying load to the tags a or b or c & by adjusting the trimmer.

5.2.5 Transformer Bay : Transformer Bay houses

i) V.F. transformers ( 1120 : 1120) ii) Signalling transformers.

(a) To restrict the induced voltage due to the catenary within the limits specified by CCITT, telecommunication circuits are to be isolated by means of V.F. Transformers. In addition signaling transformers are required for deriving phantom circuits. These transformers provide impedance matching and isolation between balanced and unbalanced circuits at the repeater station.

(b) Transformer Bay is a cabinet which houses the transformers and are installed in cable huts and repeater stations. It conforms to the drawing No. TCA 15202. It is a cabinet made of mild steel sheet and of size 525 mm x 272 mm x 1630 mm with two cable entry holes having suitable rubber grommet provided at the top. To have an access of the equipment, front door provided with suitable locking arrangement is to be opened. In back, it is provided with covers which are three in numbers and are screwed to the body. The distribution of the components in the transformer bay from top to bottom are as follows (1) Lightning arrestor base plate (2) Link panels (3) Transformer panel (4) Lightning arrestor base plate. An earthing strip is also provided which runs vertically to solder all connections that are to be connected to earth.

(c) The transformer bay can accommodate 6 transformers in one row. The different transformers shall be fixed as detailed below :

VF transformers (1120 : 1120) shall be fixed at positions 1,3,4 & 6. Signalling transformers (1:2) shall be fixed at positions 2 & 5.

(d) Five link panels are required to be provided in the transformer bay. The first 2-1/2 panels from top are required to be connected to the incoming cable and the rest to the outgoing cable.

5.3 DUAL TONE MULTI FREQUENCY CALLING SYSTEM.

5.3.1 (a) This system for train traffic control equipment with voice frequency signaling using Dual Tone Multi Frequency(DTMF) signals for 4 Wire and 2 Wire operation is known as DTMF Calling System.

(b) The control office equipment is normally designed for 4 Wire operation which can be converted into 2 Wire operation by provision of hybrid attachment. The way station equipment shall be different for 4 Wire and 2 Wire working.

5.3.2 CONTROLLERS EQUIPMENT : The control office equipment consists of operating console with DTMF code generator and voice communication equipment.

(i) The operating console with code generator has following facilities :

a) Standard DTMF Key Pad for calling 99 stations with two push button operation.

b) Station group code button A, B, C, D.

c) Push button for general call for calling stations simultaneously.

d) Push button LR for extending long ring at way stations.

e) Special push button 'RT' - for repeating last transmitted station code.'RS' - to reset the system 'RC' - for row/column frequency check. 'DL' - for cancellation of code.

(f) Visual indications for System O.K., Display of station code and power ON indication.

(ii) The communication equipment consists of loudspeaker/microphone with amplifiers and hand micro telephone and controllers headset.

5.3.3 WAY STATION EQUIPMENT: The way station equipment shall consist of DTMF decoder which can be assigned any DTMF station code/group code selectable with DIP switches, voice communication equipment and 2-Wire/4-Wire desk type control telephone.

5.4 POWER SUPPLIES :

5.4.1 For selective calling system employing DTMF signalling, the following should be provided :

(a) At control office 12V DC supply (with a ripple factor of 2 mV) shall be provided from secondary batteries of 12V/80AH with associated charger.

(b) At Wayside Station 12V DC supply (with a ripple factor of 2 mV) which can vary between +20% to -10% of the nominal value for way station equipment shall be provided from secondary batteries of 12V/40AH with associated charger.

5.4.2 All secondary batteries should be housed exclusively in a separate room with provision of exhaust fans.

5.4.3 Standby diesel generators, wherever, provided, should be sufficiently rated to enable them to take the load of lights and fans during failures of AC mains supply.

5.4.4 All batteries should be adequately insulated from earth.

5.5 EARTHING: All earth connections shall be of approved type as detailed below :-

(i) All earth connections shall be approved type obtained by burying a pipe or rail of adequate size in the ground. (ii) The resistance of an earth shall not be more than 10 ohms. (iii) 4 mm diameter galvanised iron wire adequately supported or secured and free from bends and spirals should be used. (iv) The earth wire should be soldered to the wire connected to the earth terminal on the test panel.. Similarly, it should be securely connected to the earth electrode. (v) The ground surrounding the earth electrode should be kept moist by periodically pouring saline water. (vi) Where more than one earth has to be installed, they should be separated by a distance of not less than 2300 mm from each other. (vii) Where a number of telegraph instruments are provided in the same telegraph office, separate earth leads shall be provided for each instrument. (viii) An earth wire should be run from one end to the other, beneath the tables, so that the earth connection for each instrument is as short as possible. For this purpose, earth wire of 3 SWG copper should be used. (ix) Separate earths shall be provided for the return circuits and lightening discharges. The earth provided on the test panel for testing the circuits shall also be separate.

5.6 At junctions where two or more control circuits are required to be interconnected frequently, automatic interconnection, preferably of an approved type should be provided in lieu of normally operated jack boxes/boards.

5.7 INSTRUCTIONS FOR INSTALLATION

5.7.1 LAYOUT OF CONTROL OFFICE :

a) Control offices and the attached test rooms shall be air-conditioned.

b) The layout of the control office shall, as far as possible, conform to the layout shown in Annexure III. They should be located, as far as possible, in the ground floor.

c) Control offices, especially the controller's booths, shall be acoustically treated to eliminate disturbing noises, echoes, etc., to enable use of microphones and loudspeakers. The reverberation constant of the booth shall not be more than 0.4 seconds.

d) i) The minimum floor area of the controller's booth shall be 12 sq. metres.

ii) The booths shall be provided with diffused lighting by artificial illumination, avoiding pockets of shadows. The artificial illumination shall provide an illumination of not less than 110 metre candles on the controller's table.

iii) The booth shall be colour treated to avoid fatigue to the eyes and shall be aesthetically pleasing.

iv) The floor shall be covered with linoleum.

v) The doors and sides of booths facing the Chief/Deputy Controller shall be provided with glass panels on the upper half.

vi) Doors of booths shall be single-leaf, teak-wood flush fitting, self-closing type.

e) Controller's tables and chairs shall be designed to give maximum facility for efficient discharge of their duties.

f) A false ceiling shall be provided preferably of an acoustic material such as 'Cellotex', perfotile sheets, etc., to provide good acoustic and thermal insulation. The ceiling height shall not be less than 3.25m.

g) All equipments except those required for operation by the controllers, especially equipments producing noise during operation, shall be located in a different room outside the control office.

h) Batteries, especially secondary cells, shall be located in a separate room outside the control office.

i) The test room shall be located as close to the control office as possible to enable the test room staff to attend to any fault promptly.

j) The test room shall have enough floor area to accommodate the test panel and maintenance spares required for the various equipments. It shall also accommodate tables and chair for the maintenance staff to carry out overhauling, repairs and maintenance.

k) While planning a control office, space required for future additions and alterations should be kept in view.

l) Adequate space should also be earmarked for stationery and filing cases.

5.7.2 INSIDE WIRING IN CONTROL OFFICE:

a) Wire runs to the controller's table shall be terminated on a terminal strip of approved type, fixed at a suitable place in the rear. The terminal strip shall be protected by a suitable cover.

b) Wiring for the controller's telephone set, telephone sockets and the selector key case/push button panel/operating console shall be underneath the table top in a concealed manner.

c) The selector key case/push button panel/operating console shall be installed on the left-hand side.

d) Separate conduits or runways shall be provided for communication and high voltage electric wires.

e) Before constructing a building for a control office, distributing systems for communication wires shall be included in the building specifications.

f) Facilities for provision of communication wire should be made during construction of the building to enable concealment of cables and wires, thereby improving the general appearance of the control office.

g) Mechanical protection should, as far as possible, be provided for cables and wires to achieve trouble-free service.

h) Terminal and junction boxes should be located suitable to enable maximum flexibility while carrying out additions or alterations.

i) All incoming line wires underground cables shall be terminated in the test room before extending them to control office.

j) Where direct termination in the test room is not possible, they should be terminated on a termination box of approved type and extended to the test room in a duct or a conduit through the wall.

k) It should be ensured that the entrance cable is not susceptible to damage due to proximity of water pipes, steam pipes, engine exhausts, electric light

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Telecom Manual English