256 Instln Manual

C-DOT 256P RAX

INSTALLATION MANUAL

SystemPractices

Section No. 355-305-0386

Draft 05, February 2001

C-DOT 256P RAX

INSTALLATION MANUAL

2001, C-DOT Printed in India

C-DOT 256P RAX

INSTALLATION MANUAL

DRAFT 05

FEBRUARY 2001

PHALGUNA 2057

SERIES 300 : INSTALLATION

CSP SECTION NO. 355-305-0386

THIS CDOT SYSTEM PRACTICE REFERS TO THE CDOT 256 PORT RURAL AUTOMATIC

EXCHANGE (ABBREVIATED AS C-DOT 256P RAX IN THE REST OF THIS PUBLICATION).

THE INFORMATION IN THIS SYSTEM PRACTICE IS FOR INFORMATION PURPOSES AND IS

SUBJECT TO CHANGE WITHOUT NOTICE.

A COMMENT FORM HAS BEEN INCLUDED AT THE END OF THIS PUBLICATION FOR

READER'S COMMENTS. IF THE FORM HAS BEEN USED, COMMENTS MAY BE

ADDRESSED TO THE DIRECTOR (SYSTEMS ), CENTRE FOR DEVELOPMENT OF

TELEMATICS, 39, MAIN PUSA ROAD, NEW DELHI - 110 005

2001 BY CDOT, NEW DELHI.

Table of Contents

Chapter 1. Introduction ..............................................................................................................................5

1.1. Objective ........................................................................................................................5

Chapter 2. Hardware Packaging ................................................................................................................6

2.1. General...........................................................................................................................6 2.2. Physical Description of RAX.........................................................................................7

Chapter 3. Site Plan ..................................................................................................................................19

3.1. General.........................................................................................................................19 3.2. Electrical Specifications..............................................................................................21 3.3. Earthing System..........................................................................................................21 3.4. Local Purchase Items and Tools.................................................................................22 3.5. Equipment Placement.................................................................................................22

Chapter 4. Installation of Power Plant ....................................................................................................25

4.1. General..........................................................................................................................25 4.2. Installation of Power Plant..........................................................................................25

Chapter 5. System Installation ................................................................................................................28

5.1. General..........................................................................................................................28 5.2. Unpacking the Cabinet ................................................................................................28 5.3. Visual Inspection..........................................................................................................28 5.4. Assembling the Cabinet ...............................................................................................29 5.5. Unpacking the Maintenance Panel/Printer................................................................30 5.6. System Interconnections..............................................................................................30 5.7. RAX Setup ....................................................................................................................41

Chapter 6. Cabling and Cable Routing ....................................................................................................42

6.1. Introduction ..................................................................................................................42 6.2. Cables............................................................................................................................42 6.3. Cable Routing ...............................................................................................................64 6.4. Colour Coding and Identification Scheme for Cables ................................................66

Chapter 7. Power on Procedure................................................................................................................76

7.1. Power on Procedure .....................................................................................................76 7.2. Exchange Data Preparation ........................................................................................76 7.3. Programming................................................................................................................77

H:\HOME\RAX\WORD\RXINSTM1.DOC January 17, 2001

INSTALLATION MANUAL 5

Chapter 1.

Introduction

1.1. OBJECTIVE

The objective of this Installation Manual is to help in the installation of C-DOT 256 RAX Exchange. The manual is divided into different chapters. Each chapter gives details of an activity to be performed while installing the C-DOT 256 RAX.

This document covers the following aspects:

Hardware Packaging

Site Plan

Installation of Power Plant

MDF Installation

System Installation

Cables and Cable Routing

Power-on Procedure

Chapter 2 covers the hardware packaging, describing various items and their assembly to form a complete system. Chapter 3 describes the various requirements at the site before the system installation and provides general information for planning the site. Chapter 4 describes the installation of power plant. Chapter 5 presents the system installation procedures in detail. Chapter 6 gives the details of various cables and their routing. Chapter 7 gives the power on procedure.

6 C-DOT 256P RAX

Chapter 2.

Hardware Packaging

2.1. GENERAL

The C-DOT 256 RAX is a member of the C-DOT family of Digital Switching Systems, next to C-DOT 128 RAX. The system design is highly modular and hence flexible towards the requirements of system size and technology updates.

The 256 RAX is packaged into a small cabinet of 1045mm x 580mm x 1080mm in size, which accommodates two card frames (stacked one above the other, bottom frame named as MASTER and top as SLAVE) and the power distribution panel.

Each card frame can house 26 cards (assembled Printed Circuit Boards). The system circuitry is packaged into various card types - each card type represents a functional unit of the system. Depending upon system size and features required, a combination of these card types is used to configure the system.

The cards in a card frame are interconnected through the backplane (also called the mother board), which is mounted on the card frame. The cards are jacked into the card frames and connected to the mother board with the help of pluggable connectors. Precautions are taken to ensure proper alignment of cards and jacking-in of cards into right card slots.

Interconnections between master and slave frames are provided by means of inter frame cabling.

The RAX cabinet is interconnected to its add on unit, the Maintenance Panel by means of a connectorised cable. The maintenance panel - a desktop unit consisting of LED indicators, push-button keys, liquid crystal display etc.- caters for the operation and maintenance features of the C-DOT RAX. It also provides the connections for the printer and a modem to communicate with Centralised Operations and Maintenance Centre (COMaC), which is a software package for remote Operation & Maintenance.

The Main Distribution Frame (MDF) provides interconnections between exchange side terminations and line side terminations. It also provides a suitable arrangement for incorporating protective devices.

HARDWARE PACKAGING


2.2. PHYSICAL DESCRIPTION OF RAX

The C-DOT 256 RAX system has the following eight major constituents:

System Cabinet

Card Frames

Mother Board

Power Distribution Panel (PDP)

Printed Circuit Boards (PCBs)

Maintenance Panel

MDF

Power Equipment

2.2.1. System Cabinet

The 256 RAX system cabinet consists of the following parts:

The Main Cabinet frame

Horizontal plates

Side plates

Vertical cable routing trays

Dust filter

False panels

Cable clamps and covers

PDP Assembly

The cabinet is constructed with four vertical uprights with top and bottom frames. The top and the bottom frames are welded to the vertical uprights. Doors are provided on the front and rear side of the cabinet. A two point locking arrangement with a handle is provided on both the front and rear door.

The top cover is fixed to the top frame assembly and foot rests are welded to the bottom frame. Mounting holes for fixing the cabinet on the floor are provided in the foot rests.

The main cabinet has provisions for fixing two 128 card frames one over the other. The bottom card frame is referred to as Master frame and the top card frame is referred to as Slave frame.

At the top of the vertical uprights, two side plates are welded. Two horizontal plates are also welded just above the master and slave mother boards. Both

Chapter 2

8 C-DOT 256P RAX

side plates and horizontal plates have holes at optimum distances over their surface for tying the cables.

Vertical cable routing tray is provided on both sides of the cabinet. Cable inlet and cable outlet are provided at the bottom end of the cable routing tray. All the cables from the MDF, power cables, Maintenance Panel cables are routed through this vertical cable routing tray by the use of two tier cable clamps mounted one above the other and reinforced with a cover plate and screws.

PDP assembly is provided at top of the cabinet on the front side. One horizontal cable routing tray is provided just below the PDP for the routing of filter cables. The design of the cabinet allows satisfactory operation of the system in highly dusty environment. A dust filter is provided to avoid the entry of dust into the cabinet. It has a separate framework which is slid between the two foot rests from the front, and is held in position by the front end screws.

The cabinet is designed such that the system is capable of working in a non-air-conditioned environment with provision for circulation of air. False panels at the bottom have ventilation slots to assist cooling by natural convection.

The dimensions of the RAX cabinet are 1045x580x1080 mm. Its weight without the cards is approximately 150 kgs. The mounting of card frame inside the cabinet is such that it facilitates easy access for maintenance.

2.2.2. Card Frames

In C-DOT 256 RAX, provision exists for housing two card frames. Each card frame can accommodate 26 cards. But since the PSU card takes up two slots space, only 24 cards can actually be accommodated. The card frames are slid along guide angles and fixed in front by screws. These two card frames are placed one over the other inside the cabinet. Figure 2.1 shows the front view of the cabinet which shows clearly the master frame, slave frame, and power distribution panel.

HARDWARE PACKAGING


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Chapter 2

10 C-DOT 256P RAX

The mother board is mounted on the back side of the card frame. The cards are jacked in, side by side in a plane perpendicular to that of the mother board. The mother board is fixed in position using screws. The cards are supported on the top and bottom by card guides. This ensures proper alignment of the cards. A typical layout of the card frame is shown in Figure 2.2.

2.2.3. Mother Board

The mother board is a printed circuit board of dimensions 820x253mm (Refer Figure 2.3). The tracks on the mother board provide interconnections between cards. Soldering and wire wrapping are reduced to a minimum by using the interconnecting tracks on the mother board.

Reverse Euro-male connectors are mounted on the mother board. The cards have Euro-female connectors which plug-in to the corresponding male connectors present on the mother board. On all cards except power supply cards, 64 pin Euro connectors are used.

Use of pluggable connectors ensures quick replacement for maintenance and repair purposes. For ease of jacking-in and pulling out of cards, card ejectors are used. Polarising bars are mounted on the mother board, which ensures that the control cards are not put in the wrong card slots. This reduces to a minimum the possibility of damage to card circuitry due to wrong insertion of a card into a card slot not meant for it.

2.2.4. Power Distribution Panel (PDP)

The power distribution panel (refer Fig. 2.4) is mounted on the top, front side of the 256 RAX cabinet. PDP receives the -48V DC from the float charger through a HRC fuse and distributes the load (-48V DC) power to PSUs (Copy 0 and Copy 1) of master and slave frames, voice (-48V DC) power to master and slave frames and -48V DC power to maintenance panel (MP). All the power outputs from the PDP are connectorised by using 4 pin polarised power connectors. L-filters and slow blow glass fuses are used for all power outputs. All the power outputs from the PDP are sensed and an audio output is provided in case of any fuse failure. There is a provision to check the audio and also to disable the sound.

The filter circuits are incorporated in a child card, with visual indication of power availability. The child card concept is very useful for maintenance. These filter cards are mounted on the PDP mother board. Finally the PDP mother board is mounted on the PDP tray. Master ground bar, which is also the system ground, is located at the bottom, on back side of RAX cabinet.

HARDWARE PACKAGING


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Chapter 2

12 C-DOT 256P RAX

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CONNECTORS

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HARDWARE PACKAGING


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Chapter 2

14 C-DOT 256P RAX

2.2.5. Printed Circuit Boards (PCB)

Each card type in the system represents a functional unit. The functional unit is further classified into functional blocks. The electronic components comprising the circuit are mounted on printed circuit boards (PCB)/cards. Each card is of dimensions 304.8mm x 254mm (Refer Fig. 2.5).

Two layer and four layer cards are used depending upon circuit complexity, component layout and component density. Heat dissipating components like power transistors and power supply regulators are mounted with heat sinks. In case heavy components are mounted on the card, proper stiffening precautions are taken. All the system cards as per its configuration are jacked into the designated slots in master and slave frames.

Each card is provided with two Euro-female connectors which when inserted in the card frame, mate with the Euro-male connectors on the mother board. The connectors on the PCB can either be 64-pin or 96-pin depending upon the requirement. In case of Power Supply cards, since the current drawn on each of the supplies is considerably high, 96-pin Euro-connectors are used and pins are shorted to share the load.

The following are the types of cards used in the system:

i) Line Card (LCC) Interfaces analog subscriber line terminations.(Capacity: 8 terminations/ Card)

ii) CCM Card Interfaces analog coin collection box subscriber or PBX lines.

It also provides 16KHz metering pulses on 7th and 8th circuit for STD PCO/Home metering. (Capacity: 8 terminations/ card)

iii) Two-Way Trunk Card Interfaces two wire (TWT)analog trunk lines. Capacity: 8 terminations/ card)

iv) 4-Wire E&M Card Interfaces analog carrier (EMF) circuits using E&M signalling. (Capacity: 8 terminations/ card)

v) RAX Announcement Announcements and tones are stored cum Tone Card (RAT) as digital samples in RAT and are available at the respective port outputs or channels.

HARDWARE PACKAGING


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Chapter 2

16 C-DOT 256P RAX

vi) 30 Channels Digital Interfaces a 30 channels PCM link Trunk Card with the switch.

vii) RAX WILL controller Interfaces two 30 channels PCM link card with the switch.

viii) RAX Multi Frequency Receives and transmits MF/ Card (RMF) DTMF signals. (Capacity: 8 channels/ card)

ix) RAX Termination Test Facilitates subscriber/trunk line Card (RTC) testing.

x) Signalling Processor Receives/sends signalling information Card (SPC or ISP) (line on-hook, off-hook, dial pulses etc.) from/to termination cards.

xi) RAX Switch Controller Card Digital switch which connects (RSC) two subscribers by way of TIME SLOT INTERCHANGE. It controls the time multiplexing/demultiplexing functions for the PCM coded voice samples from/to the termination cards.

xii) RAX Administration It has message links with RSC Processor Card (RAP) & contains the exchange database and other records. It also distributes clock to all other cards.

xiii) Conference Card (CNF) Caters for three-way conferencing (Two subscribers and operator) in the case of trunk offer.

xiv) Power Supply Card-I (PSU-I) It generates all the operating voltages (+5V, +12V, -9V DC & -12V DC) required by the cards and the ringing current 75V rms (25 Hz). Input to power supply is -48 Volts D.C.

Depending upon the configuration of the system the cards are placed in the master and slave card frame. The mother board runs throughout the length of the card frame. Inter-card connections are through this backplane. All the critical cards e.g. PSU, RSC, SPC, RAP and RAT are duplicated to make the switch fault tolerant.

2.2.6. Maintenance Panel

This provides the status indications for all the cards and provides an interface for the user to interact with the system (Refer Fig. 2.6).

HARDWARE PACKAGING


2.2.7. Main Distribution Frame (MDF)

The main distribution frame (MDF) provides interconnection between exchange side (equipment side e.g. LCC and trunk cards of the system) and the line side (subscriber lines and trunks) terminations.

2.2.8. Power Equipment

The float charger (AC/DC converter) with a standby 24 cell battery form the -48V DC source for the system. Each cell should be of 2.15V & at least 120 AH.

Chapter 2

18 C-DOT 256P RAX

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Chapter 3.

Site Plan

3.1. GENERAL

This chapter provides general information about site planning before the installation of C-DOT 256 Port RAX system. The main requirements are:

Floor space

Environmental conditions

Power supply

A typical layout is shown in Fig. 3.1.

Before the installation of C-DOT 256 Port RAX system, the site should be made ready with the following:

3.1.1. Floor Space

The system needs an enclosure of 3.5m x 3.5m with a ceiling height of 2.9m to accommodate the system cabinet, a table on which MP and printer are placed, the power supply source or the Float charger, the Main Distribution Frame and the Transmission Equipment (if necessary).

For the battery sets, a separate room of 2.5m x 2.5m is required as it releases the acid fumes which would corrode the other equipments if placed in the switch room.

3.1.2. Environmental Conditions

The switch room, where the system and other equipment are installed should be cool and dust free. The illumination should be 300 lux or 2 number of paired fluorescent tubes should be made available, placed with a gap of 1.5m between them.

The battery room should be well ventilated to clear the acid fumes released by battery sets. The walls and the wood work should be given acid resistant coating. The floor of the battery room should have a drain to clear the acid spills. The battery sets should be placed in such a way that no direct sunlight falls on any of the battery sets.

Chapter 3

20 C-DOT 256P RAX

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3.2. ELECTRICAL SPECIFICATIONS

The C-DOT 256 RAX system requires uninterrupted -48V DC supply derived from single phase 50Hz 230V 10% commercial AC supply. The power plant is of float type with float rectifier-cum-charger which floats two sets of 24 cell and 120 AH each, lead acid batteries across its output.

The output of the battery should be able to supply power to the system and to the transmission equipment if required.

The float charger should accept 230V 10%, single phase, 50Hz AC supply as input and provide 48V DC at the output. On failure of the mains supply the battery sets deliver the power. On restoration of mains, the float charger would not only supply power to the system (s) but also charge the battery.

3.3. EARTHING SYSTEM

A perfect earthing should be provided mainly to ensure:

reduction in cross talk and noise in the telecommunication circuits;

protection of the system against dangerous foreign voltages;

protection of person and plants against leakage from station power wiring to metallic apparatus, frames etc.

There are many earthing systems adopted by the telecommunication department. One of the earthing systems is adopted depending upon the type of soil resistance. The prime requirement is the earth resistance and it should not exceed 2 ohm even at extreme conditions. Some of the Earthing Systems which are commonly employed are:

i) Spike Earth Electrode System:

This is generally provided at all new automatic exchanges where adequate space is available around the exchange and where sub soil is suitable for driving in the pipes to a depth of 375 cms.

ii) Lead Strip Electrode System:

This type of earthing system is employed where adequate space is available but rock is encountered in less than 375 cms from ground level.

iii) Earth Plate Electrode System:

This type of earthing system is employed when the layout of the exchange site is such that adequate space is not available to install.

The earthing cable, a Bare Tinned Copper (BTC) wire of 19/1.6mm or 100/300 lb copper wire or 7/16 cable with red insulation should be terminated on a copper bar of 25mm x 6mm x 200mm (typical). The copper bar also called Earth Bus Bar

Chapter 3

22 C-DOT 256P RAX

should be placed close to earth pit. The Earth Bus Bar is fixed to the wall at a convenient height by means of screws but insulated from the wall. This bus bar would be the reference for all the grounds provided in the system. See Fig. 3.2 for the various terminations on earth bus bar.

3.4. LOCAL PURCHASE ITEMS AND TOOLS

The items to be procured locally at site by the local authorities are listed in Table 3.1.

Make sure that these locally procured items are made available before the starting of Installation.

3.5. EQUIPMENT PLACEMENT

The RAX cabinet, the float charger and the transmission equipment should be placed at least 1m away from the wall to ensure comfortable system installation and maintenance. Fix the locations for the various units in the switch room and if necessary, mark the location using the following guide lines:

Fix the location of the MDF. It has to be fixed onto the wall. It is preferable to have the MDF close to the earth bus bar and external cable inlet. The distance between the system and the MDF should not exceed 5m.

A Miniature Circuit Breaker (MCB) for a single phase 230V 10% AC should be provided near the location of the float charger.

Run the PVC conduit (square or circular cross section) of 60mm side or dia from the location of RAX cabinet to the power plant, MDF, earth bus bar and the battery.

Run PVC conduits from transmission equipment to the MDF.

Similarly, run another cable (7/16 cable with red colour insulation) with one end terminated on the Earth Bus Bar and the other end left free near the location of float charger.

Run a cable (7/16 cable with red colour insulation) terminating one end on Earth Bus Bar and leaving the other end free near the location of MDF.

Bring the external cables through the PVC conduits and leave them free near the location of MDF.

Run the cable from the transmission equipment to the MDF through the PVC conduits.

SITE PLAN


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Chapter 3

24 C-DOT 256P RAX

Table 3.1

LIST OF LOCALLY PROCURED ITEMS

S.No. Material Description Quantity

1. PVC pipes of 63 mm dia 6 to 7 meters

2. PVC Elbow bends 63 mm 4 nos.

3. PVC Tees 63 mm 2 nos.

4. PVC pipe 2 or 3 bends, 3to4 meters 2 or 3 tees and fixing clamps

5. PVC pipes and bend 40mm for extending Site dependent the battery cables

6. MCB 15A 2 pole (phase and neutral) 1 no.

7. 3 core 15A flexible copper cable for extending the AC mains to the power plant

3 to 5 meters

8. Cable - 7/16 copper wire with (i) red insulation and (ii) blue insulation

10 m each.

9. HRC fuses 25A for battery output. 2 nos.

10. Earth bus bar (tin coated copper) of dimension 25mm x 6mm x 200mm with fixing bolt and supports drilled with 7 holes

1 no.

11. Metallic plinth/cement plinth.

12. Crimping lugs16 Sqmm 22 nos.

13. Hand crimp tool 2.5 to 16 Sqmm

14. Cutter & wire stripper and knife one each

15. Cable tie 150 mm 1 pkt (100 nos.)

16. Screw driver small 1 no.

17. Spanner set small 1 set

Note: Items 1 to 5 and 11 are optional and their requirement depends upon the site.


Chapter 4.

Installation of Power Plant

4.1. GENERAL

The first consignment may comprise the power plant and the MDF, that need to be installed first. This is required because charging of the battery and getting ready with the power plant, termination of external subscriber cables and the trunk cables from the transmission equipment on to the line side of main distribution frame requires quite some time. Therefore, this portion of installation should be completed before the arrival of second consignment consisting of the system and its accessories.

4.2. INSTALLATION OF POWER PLANT

The installation of power plant comprises

installation of float charger

setting up of battery.

4.2.1. Installation of Float Charger

a) The float rectifier-cum-charger should be placed as per the layout plan.

b) Check that the earth resistance at the earth bus bar is less than 2 ohms and then connect the earthing cable to the positive of the float charger.

c) Terminate the 230V 10% AC power cord on the miniature circuit breaker provided near the location of the float charger. Check that AC ground is provided on the chassis of the circuit breaker. Now connect the chassis of the float charger to the chassis of the circuit breaker.

d) Now Extend the red and blue cables from the float charger to the battery sets (See Fig. 4.1).

4.2.2. Setting up the Battery

a) Place 24 numbers of 2.15V cells on the wooden stand with porcelain insulator at the bottom four corners of each cell.

Chapter 4

26 C-DOT 256P RAX

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INSTALLATION OF POWER PLANT


b) All the 24 cells of the battery should be interconnected using copper strip, by means of bolt and nut leaving the positive electrode end of the first cell and the negative electrode end of the last cell of both the sets of batteries.

c) Terminate the positive end cable (7/16 cable with red colour insulation) of the charger on the positive electrode of the first battery.

d) Terminate the negative end cable (7/16 cable with blue colour insulation) of the charger on a 25 A HRC fuse. The other end of the fuse should be terminated on the negative electrode of the last cell.

e) Similarly install the second battery set also.

f) Now charge the battery sets one by one and perform the heat run test on the power plant to check the stability.

28 C-DOT 256P RAX

Chapter 5.

System Installation

5.1. GENERAL

The second consignment at the site comprises the following items packed in wooden cartons and CFB boxes.

Cabinet (Card cage, PDP etc. fitted)

Cards (in more than one box)

Maintenance Panel & Printer

Cables

These items must be available at the site before starting installation of the system. The tools that are required at the site are quite minimal but are essential. These include:

Spanner set

Hammer (5 kg.)

Rawl jumper with bits M5, M10

Wire wrapping tool

Crimping tool

Lugs with 5mm dia holes etc.

5.2. UNPACKING THE CABINET

To unpack the wooden carton containing the cabinet, follow the steps given below:

Keep the wooden carton containing the RAX cabinet in upright position and remove the front cover by removing bolts (or nails if it is nailed).

Remove the packing material from all sides and slowly pull the unit out.

Remove the polythene cover over the cabinet.

5.3. VISUAL INSPECTION

Check the cabinet from all sides for dents, damages etc.

SYSTEM INSTALLATION


Open front and the back doors and check that there are no loose components or damages.

Check that cables are intact and the cable layout is undisturbed.

If there is any inconsistency found during visual inspection, inform the manufacturer for proper placement or replacement.

Check the card cage frames for their rigidity and alignment with respect to the cabinet frame.

Check that the mother boards are rigidly fixed to the card cage frame.

Check that all the connectors are available corresponding to all the slots. (on slot position 26A and 26B the connectors are not provided)

Check that no bare or open ended wire is hanging on the mother board.

Check that PDP is fixed firmly at its place.

Check that the Fast-on connectors are fully inserted into the tabs on the mother board (This ensures 48V on the mother board. Refer to the corresponding drawings/tables in Chapter 6, if required).

Check that all the inter-frame cable connectors are firmly fixed to the male connectors on the backplane. The cable markers are given above every connector of these cables. Ensure that cables are placed at their proper places. In case these are supplied separately, place these on the proper positions at backplane referring to the cable details in Chapter 6. Table 6.1 gives the details of the cables and their terminations on the mother board. Except for GGR2, GGR3 and GGR4 all cables are terminated on mother board at one end.

Check the connectors for any damage on the back plane.

5.4. ASSEMBLING THE CABINET

After unpacking and visual inspection of the cabinet following steps are to be followed for assembling:

Installant has an option of putting the plinth below the RAX. Four holes are to be drilled on the floor, according to the plinth (if plinth is to be used) or else according to the RAX cabinet.

Place the screws (if plinth is used then use screws defined for plinth, if not, use screws which are to be used for RAX) in the holes, fix them with plugging compound and let it dry for some time.

Place the plinth/RAX over the screws and use nuts to tighten the plinth/RAX.

If using plinth then put the RAX on the plinth (after fixing plinth as in above step) and use nuts and bolts to tighten the RAX.

After fixing RAX, place the false panels and fix them.

Chapter 5

30 C-DOT 256P RAX

5.5. UNPACKING THE MAINTENANCE PANEL/PRINTER

Cut the straps of the CFB box and open the box.

Take out the Maintenance Panel/Printer unit from the box and remove the polythene cover over it. Place the unit on the table near the cabinet.

Preserve the box, as this is reusable for transportation during maintenance or obtaining spares.

5.6. SYSTEM INTERCONNECTIONS

Get the subscriber/trunk cables, prepared according to the configuration and route them through left and right side trays (refer section 6.3). One end of each cable is to be connected to the respective mating sockets on the back plane. Other end of the cables are to be properly routed to MDF (refer chapter 6)

5.6.1. System Earthing

Connect GGR4 cable on RAX master bus bar fitted on bottom panel at rear side of RAX cabinet.

Run the wire through the cable entry and cable clamps.

Run the wire through the PVC conduit upto the earth bus bar.

Terminate the wire on the earth bus bar.

5.6.2. Power Supply Connection

Terminate the wires which are extended from the power plant as follows:

The Black wire should be terminated on -48V point on PDP.

The Red wire should be terminated on GND point on PDP.

Check that power supply connections and groundings are proper by comparing with the Fig. 4.1.

5.6.3. Peripheral Unit Interconnections

MP is to be placed on table and two cables - MP power cable and MP interface cable, coming out of RAX will be terminated on MP. Connect a suitable 80/132 column Industry Standard Printer.

5.6.4. Exchange Side Terminations on MDF

Insert the MDF cables into the cable entries (left hand side cables on LHS cable entry and right hand side cables in RHS cable entry) and pull them out through cable clamps.

Run the cables through PVC conduits upto the MDF.

Cut the cables of required length with margin.

SYSTEM INSTALLATION


Lace the cables properly onto the MDF structure.

The a- and b- wires from the subscribers side are terminated on the adjacent columns of this connector block and the corresponding terminals in that column are left free in order to accommodate the jumper wire coming from the other connector block. The subscriber lines are connected to the RAX by providing this jumper.

Single strand, multi pair cables should be used for making the connections on these connector blocks. The tags on these connector blocks automatically strip the insulation from a wire and make contact with it when a wire is inserted into it. In order to terminate the wires on these connector blocks, use the insertion tool provided with the installation tool kit and proceed as follows:

Take the first 32 pair cable.

Remove the PVC insulation and terminate the 8 pairs which have white transparent polythene wrapper on the connector module pertaining to the subscriber/trunk lines.

The next three units with polythene wrapper yellow, brown and blue should be terminated on their respective connector blocks.

5.6.4.1. Termination of 8 Pairs Unit

Termination of 8 pairs unit on the MDF should be done as follows:

Route the cable such that the cable enters through one of the cable inlets on the back mount plane frame.

Remove the insulation, fan out the other units (A unit consists of 8 pairs of wires and wrapped with a coloured transparent polythene).

Take the first unit, unwrap the wrapper.

Place the connector module in its location. Place the wires in the same order as designated.

Using the insertion tool insert the conductor into the slots of connector module.

After completing the terminations on one connector module place the next connector module, insert the conductors into the slots using the same tool.

5.6.4.2. E & M Trunk Termination

E & M (4-wire voice) (Refer Fig. 5.1)

The E&M (4-wire voice) Trunk Card basically interfaces the digital switching exchange with E&M trunk lines. There are 4-wires for voice (2-wire for voice-

Chapter 5

32 C-DOT 256P RAX

in and 2-wire voice-out) and 2-wires for signalling (one for signalling in each direction) per trunk line.

In case of E&M wire coming from the transmission equipment, line side termination is not necessary because normally protection is provided on transmission equipment itself.

Each 32 pair round cable consists of 4 subunits having sleeve colour as white, yellow, brown and blue. In case of E&M termination white sleeved subunit is connected to Tip and Ring (IN) of Exchange. Yellow sleeved subunit is connected to TIP and Ring (out) of Exchange and brown sleeved subunit is connected to E&M of the exchange.

If we are not using EMF card in slot 3,4,5 and 6 of master and slave frame, then the termination of 8 circuits are according to following colour scheme.

If more than 8 E&M cards are required than they must be procured separately & their cables should also be purchased separately. Their terminations can be done as per requirement on the existing MDF (if some space exists), else new MDF is required.

Colour Pair Circuit No.

Sleeve colour Wire-a Wire-b

1 WH BU WH

2 YL BU WH

3 BR BU WH

4 WH OR WH

5 YL OR WH

6 BR OR WH

7 WH GN WH

8 YL GN WH

Where BU = Blue, OR = Orange, WH = White, YL = Yellow, GN = Green, BR = Brown

5.6.4.3. Physical Loop/Ring Down Trunk (2-wire)

In this case there are only 2-wires over which both speech as well as signalling information are carried and they are extended to MDF on equipment side as such and correspondingly from distant exchange are terminated on the line side of the MDF.

SYSTEM INSTALLATION


5.6.4.4. Jumpering

It is the inter-connection of exchange side connector blocks and line side connector blocks. In exchange side connector block we have 8 termination and in line side connector block we have 10 terminations. Jumpering is done between them according to requirement, with red and white single strand wires.

5.6.5. MDF Terminations for Different Configuration

The RAX can be configured in three different configurations. The configurations are as follows:

C-DOT 256 RAX

Configuration Details Sl. No.

Configuration Type Line Cards

CCM Cards

Two-way Trk. Cards

EMF Cards

Digital Trunk

1. 184 Lines 1 Digital Trk (30 Channel each)

A 19 4 - - 1

2. 120 Lines 3 Digital Trk (30 Channel each)

B 12 3 - - 3

3. 56 Lines 5 Digital Trks (30 Channal each)

C 5 2 - - 5

For all the above mentioned configuration the two MDFs are sufficient but if some deviation is there in the configuration then one has to use the IIIrd MDF. The equippage and termination of cables on MDF for the three configurations are described in the following sections.

Chapter 5

34 C-DOT 256P RAX

RIN

G O

UT

RIN

G IN

TIP

OU

TTI

P IN

E&M

1

1

1

1

1

1

2 3 4

3

3

3

2

2

2

4

4

4

3

3

2

2

4

4

8

8

8

8

8

8

5 6 7

5 6

5

5

6

6

7

7

7

5

5

6

6

7

7

9 0

9

9

9

0

0

0

9

9

0

0

\DESIGN\256RX-IM\2RIM-TOC

FIG. 5.1TERMINAL OF ONE CHANNEL OF 4W E&M

SYSTEM INSTALLATION


5.6.5.1. Termination for Configuration A

In this configuration we have 23 subscriber cards and 1 Digital Trunk. The 23 subscriber cards include 19 LCC and 4 CCM cards. Following table shows the card and termination mapping.

Note : LCC denotes LCC/CCM Card

Card Card

Frame Slot

MDF Termination

Frame Slot

MDF Termination

01 03 LCC-1 02 06 LCC-15

02 03 LCC-2 02 07 LCC-16

01 04 LCC-3 02 08 LCC-17

02 04 LCC-4 02 09 LCC-18

01 05 LCC-5 02 10 LCC-19

01 06 LCC-6 02 17 LCC-20

01 07 LCC-7 02 18 LCC-21

01 19 LCC-8 02 19 LCC-22

01 20 LCC-9 02 20 LCC-23

01 21 LCC-10 02 21 Digital Trk

01 22 LCC-11 02 22 LCC-21

01 23 LCC-12 02 23 LCC-22

01 24 LCC-13 02 24 LCC-23

02 05 LCC-14

Chapter 5

36 C-DOT 256P RAX

FIG. 5.3TERMINATION FOR CONFIGURATION B

FIG. 5.2TERMINATION FOR CONFIGURATION A

\DESIGN\256RX-IM\2RIM-TC1

DIGITALTRUNK 3DIGITAL

TRUNK 2

TRUNK 1DIGITAL

1 TO 7LCC

MDF-I

LCC8 TO 15

1

10

1

10

EXCHANGESIDE

LCC

TRUNK 1DIGITAL

10 TO 19

1 TO 9LCC

1

10

1

MDF-I SIDEEXCHANGE

10

20 TO 23LCC

1

10

MDF-IIEXCHANGE

SIDE

SYSTEM INSTALLATION


LCC1 TO 5

10

1

1

10

EXCHANGESIDEMDF-I

FIG. 5.4TERMINATION FOR CONFIGURATION C

DIGITALTRUNK1 TO 5

\DESIGN\256RX-IM\2RIM-TC2

LCC 7

LCC 6

Chapter 5

38 C-DOT 256P RAX

5.6.5.2. Termination for Configuration B

In this configuration there are 15 subscriber/CCM cards and 3 digital trunks. Following table shows the card and termination mapping.

Note: LCC denotes LCC/CCM Card

Card

Frame Slot

MDF Termination

01 03 LCC-1

01 04 LCC-2

01 05 LCC-3

01 06 LCC-4

01 07 LCC-5

01 19 LCC-6

01 20 LCC-7

01 21 LCC-8

01 22 LCC-9

02 23 LCC-10

02 24 LCC-11

02 03 LCC-12

02 04 LCC-13

02 05 LCC-14

02 06 LCC-15

02 10 Digital Trk-1

02 17 Digital Trk-2

5.6.5.3. Termination for Configuration C

In this configuration there are 7 subscriber cards and 5 digital trunks. Following table shows the card and termination mapping.

SYSTEM INSTALLATION


Card Card

Frame Slot

MDF Termination

Frame Slot

MDF Termination

01 03 LCC-1 -

01 04 LCC-2 -

01 05 LCC-3 -

01 06 LCC-4 02 10 Digital Trk-2 & 3

01 18 LCC-5 02 17 Digital Trk-4 & 5

01 19 LCC-6 -

01 20 LCC-7

01 21 Digital Trunk-1

5.6.6. Connections for RNS Card

RNS card can be put in any free termination slot, preferably next to the digital trunk card (RWC or RDS) on which the reference PCM link for synchronization in terminated. The reference PCM link is to be terminated on the DT card & RNS in parallel. Using cable ACB-RNSXDTRX-000 cable details are given in chapter 6. Also synchronized o/p from RNS is to be fed to both copies of RAP through another cables ACB-RNSCKSCX-000 (details in 6.2.7)

Chapter 5

40 C-DOT 256P RAX

FIG

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SYSTEM INSTALLATION


5.7. RAX SETUP

Open the box consisting of all the cards. Pull out the card from the individual box and insert into the card cage frame with connectors facing card frame and components facing your right hand side.

A typical configuration of RAX is shown in Fig. 5.5, after inserting all the cards (Printed Circuit Boards).

If CCB subscribers are existing, one of the line cards can be replaced by a CCM line card. (The CCM equipped in any trunk card slot, used as ring down trunks, cannot be used for CCB subscribers).

If STD-PCO subscribers are existing, then one of the line cards can be replaced with CCM card. Only last 2 ports of CCM card i.e. 7th and 8th port have provision to extend the 16 KHz pulses. Rest of the ports can be used for CCB subscribers.

NOTE:

By just placing CCM card in a slot does not mean that those services will be provided unless that particular slot is programmed CCB line with home metering facility.

For ring down facility use TWT/CCM card - the slot for which can be programmed for ring down.

Open the other box which consists of PSU cards. Pull out the cards and insert into slot 1 and 25 of master and slave frame. Before inserting check that the switches are OFF.

If trunk offer is required at a particular site then Conference Card (CNF) is must. CNF card can be placed in 7th slot of Master Frame. However, if trunk offer facility is not required then this slot can be used for placing any Line/Trunk Card. Conference Card provides facility for 3 party conference i.e. simultaneous conversation between two subscribers and an operator.

42 C-DOT 256P RAX

Chapter 6.

Cabling and Cable Routing

6.1. INTRODUCTION

This chapter describes the different types of cables used and the cable routing in C-DOT 256 RAX system. Certain cables are prepared in the factory for which length is known. The cables for which lengths are site dependent may require their preparation at site.

6.2. CABLES

The different types of cables used in C-DOT 256 RAX are:

Termination cables

Inter-frame cables

Power cables

Maintenance panel cables

Ground wires

6.2.1. Termination Cables

32 pair termination cables are standardised for interconnections between the C-DOT 256 RAX mother boards and the MDF, for normal subscribers or 2-way trunk lines or 4-wire E&M lines.

In case of 4-wire E&M lines, 8 trunk circuits in a card and 6 wires per trunk circuit is used, thus a total of 24 pairs of wire are used. The 24 pairs of wire are crimped in single 2x32 connector and housed in a hood, to latch with the mother board Euro-connectors. Fig 6.1 shows the E&M trunk cable details and Fig.6.2 to 6.5 show the rear view of master and slave frames with E&M termination cable connectors.

In case of 2-wire trunk and subscriber lines, the 32 pair cable is divided into 4 groups of 8 pairs each and connected to four line circuit/trunk cards. Eight pairs are connected to two 7x2 connectors and housed in a hood, to latch with the mother board euro connectors. The Fig. 6.6 shows the subscriber/trunk cable details and Fig. 6.7 to Fig. 6.9 shows the rear view of the master and

CABLING AND CABLE ROUTING


slave frame with trunk/subscriber termination cable connectors. By default RAX has the provision for 4 E&M cables in each frame.

The 32 pair cable consists of four bunches of 8 pairs, the individual bunches have been colour coded. The details are given in section 6.4. A total of 14, 32 pair termination cables are used in C-DOT 256 RAX.

The C-DOT 256 RAX system may also be configured for two Digital Trunk units, one in master frame and the other in slave frame.

RAX Digital Trunk units (RDS) provides 32 channel PCM digital trunk interface. Thus, it can substitute four line/ termination cards. Therefore, if digital trunk cards are used, two 32 pair cables (one each in master and slave frame) that are landing on 4 line termination cards in slave frame are substituted by a single shielded twisted 8 pair digital cable. This cable is brought to the system from the MDF. At the system end, the cable is split into two pairs. First 2 pairs goes to the master frame digital trunk card and the next 2 pairs are terminated on the slave frame digital trunk card. The remaining 4 pairs are left free and can be used for future expansions, if any. (Refer Fig. 6.10).

6.2.2. Inter-Frame Cables

The logical signals like PCM clock, PCM channels and ACIA signals from the master frame RSC Copy 0 and RSC Copy 1 to slave frame RSC Copy 0 and RSC Copy 1 on slot no. 12 and 15 respectively are cross connected by the use of 7x2 twisted pair flat cables IFC0 - IFC3. These cables are crimped with 7x2 connector and connected to the mother board connector which has latch mechanism. The test access bus signals and common reset on slot no. 2 of the master frame to slave frame connection also use the same type 7x2 pair twisted flat cable marked as IFC4. These cables are crimped with 7x2 connector and latched with the mother board Euro-connector.

6.2.3. Power Cables

Single wire 2-core and 4-core cables are standardised for system grounding, input power and primary power to frames respectively within the system for power cabling. The cables are clearly mentioned in the subsequent sections.

Chapter 6

44 C-DOT 256P RAX

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Chapter 6

46 C-DOT 256P RAX

FIG

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Chapter 6

48 C-DOT 256P RAX

FIG

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HE

SEC

ON

D M

OD

ULE

CA

TER

S T

O O

NE

PA

IR.

1.

Chapter 6

50 C-DOT 256P RAX

FIG

. 6.7

SUBS

CR

IBER

/ TR

UN

K C

ABLE

S\D

ESI

GN

\256

RX-

IM\2

RIM

-CL7

12

34 4

32

1

CAB

LE M

ARKE

R

2423

222121

2223

24

CAB

LE M

ARKE

R

TO M

DF

B R

OW

CO

NN

.TO

MD

F

SLAV

E FR

AME

MAS

TER

FR

AME:

SOU

RC

E P

LAC

EMEN

TD

ESTI

NAT

ION

PLA

CE

MEN

TC

ABLE

MAR

KER

AT

6

: SLO

T N

O. 2

1A, 2

2A, 2

3A &

24A

: MD

F

A R

OW

CO

NN

.

B R

OW

CO

NN

.

A R

OW

CO

NN

.

: MD

F: S

LOT

NO

. 21A

, 22A

, 23A

, & 2

4A

AT

3C

ABLE

MAR

KER

DES

TIN

ATIO

N P

LAC

EM

ENT

SOU

RC

E P

LAC

EMEN

TR

EAR

VIE

WM

ASTE

R F

RAM

E

SLAV

E FR

AME

2625

122

125

26



2625

12 2

126

SLAV

E FR

AME

MAS

TER

FR

AME

REA

R V

IEW

SOU

RC

E P

LAC

EMEN

TD

ESTI

NAT

ION

PLA

CE

MEN

TC

ABLE

MAR

KER

AT

2

: SLO

T N

O. 1

7A, 1

8A, 1

9A &

20A

: MD

F

A R

OW

CO

NN

.

B R

OW

CO

NN

.

A R

OW

CO

NN

.

: MD

F: S

LOT

NO

. 17A

, 18A

, 19A

& 2

0A

AT

5C

ABLE

MAR

KER

DES

TIN

ATIO

N P

LAC

EM

ENT

SOU

RC

E P

LAC

EMEN

T

MAS

TER

FR

AME:

SLAV

E FR

AME

TO M

DF

B R

OW

CO

NN

.

TO M

DF

CAB

LE M

ARKE

R

2423

2221

1718

1920 20

1918

1721

2223

2425

FIG

. 6.8

SUBS

CR

IBER

/ TR

UN

K C

ABLE

S

CAB

LE M

ARKE

R

12

34

12

34

NO

TE :

DO

N'T

PU

T C

ON

NEC

TOR

S O

N T

HE

SLO

TS M

EAN

T FO

R C

ON

TRO

LLER

/SER

VIC

EC

IRC

UIT

S C

ARD

i.e

RAT

, RM

F, R

TC, e

tc.

\DE

SIG

N\2

56R

X-IM

\2R

IM-C

L8

Chapter 6

52 C-DOT 256P RAX

FIG

. 6.9

SUBS

CR

IBER

/ TR

UN

K C

ABLE

S\D

ESI

GN

\256

RX-

IM\2

RIM

-CL9

CIR

CU

ITS

CAR

D i.

e R

AT, R

MF,

RTC

, etc

.SL

OTS

MEA

NT

FOR

CO

NTR

OLL

ER/S

ERVI

CE

DO

N'T

PU

T C

ON

NEC

TOR

S O

N T

HE

NO

TE :

12

34 4

32

1

CAB

LE M

ARKE

R

CAB

LE M

ARKE

R

TO M

DF

78

1099

108

B R

OW

CO

NN

.TO

MD

F

7

SLAV

E FR

AME

MAS

TER

FR

AME:

SOU

RC

E P

LAC

EMEN

TD

ESTI

NAT

ION

PLA

CE

MEN

TC

ABLE

MAR

KER

AT

4

: SLO

T N

O. 7

A, 8

A, 9

A &

10A

: MD

F

A R

OW

CO

NN

.

B R

OW

CO

NN

.

A R

OW

CO

NN

.

: MD

F: S

LOT

NO

. 7A

, 8A,

9A

& 10

A

AT

1C

ABLE

MAR

KER

DES

TIN

ATIO

N P

LAC

EM

ENT

SOU

RC

E P

LAC

EMEN

TR

EAR

VIE

WM

ASTE

R F

RAM

E

SLAV

E FR

AME

2625

122

125

26



NO

TES

:1. 2.

01

21

TD

TO M

DF

PO

LAR

ITY

TA

B (1

) IS

TO

WA

RD

S P

IN 1

AS

PE

R W

IRIN

G D

ON

E.

SN

AP

TH

E H

OO

D (F

IG. 2

) ON

TO

TH

E C

ON

TAC

T B

LOC

K (F

IG. 1

) SU

CH

TH

AT

AS

PE

R W

IRIN

G D

ETA

ILS

GIV

EN

.W

IRE

WR

AP

TH

E P

AIR

S O

N T

O C

ON

TAC

T B

LOC

K P

INS

(FIG

. 1) O

F E

AC

H M

OD

ULE

3.

MO

DU

LEN

O.

PIN

NO

.`C

' RO

WS

IGN

AL

NA

ME

BLU

E

OR

AN

GE

12

WH

ITE

4W

HIT

EH

DB

3IN

HD

B3O

UT

`A' R

OW

12

CO

NTA

CT

BLO

CK

PO

LAR

ISE

D H

OO

D(W

IRE

WR

AP

TY

PE

)

320m

m

43

SE

E N

OTE

2

FIG

.FI

G.

CA

BLE

MA

RK

ER

MO

DU

LE 1

L =

20 M

Ts (M

AX)

THE

WIR

E L

EN

GTH

SH

ALL

BE

AS

SH

OW

N IN

TH

E F

IGU

RE

.

4.P

OLA

RIT

Y T

AB

S T

O B

E R

ETA

INE

D A

S G

IVE

N B

ELO

W

MO

DU

LE 1

:1 ,

MO

DU

LE 2

:1

SH

IELD

ED

TW

ISTE

D P

AIR

DIG

ITA

L C

AB

LE

FIG

. 6.1

0D

IGIT

AL

TRU

NK

CA

BLE

DTU

FR

AM

E (S

LOT-

2)

TO M

AST

ER F

RA

ME

D T

S C

AR

D

RIN

G T

ER

MIN

ALFO

R G

RO

UN

DIN

G

\DE

SIG

N\2

56R

X-IM

\2R

I-CL1

0

FOR

RD

S-R

DC

PA

IR (M

AS

TER

FR

AM

E)

200m

m

Chapter 6

54 C-DOT 256P RAX

FIG

. 6.1

0 (a

)D

IGIT

AL

TRU

NK

CA

BLE

RW

C S

LOT

10 &

SLO

T 17

(SLA

VE F

RA

ME)

\DE

SIG

N\2

56R

X-IM

\2R

I-CL1

0A

200m

m

SO

UR

CE

:SO

UR

CE

:

DT2

-HD

B3I

NR

ED

DT1

-HD

B3I

N

RE

D

RE

D

6532

BLU

E

OR

AN

GE

GR

EE

N

WH

ITE

GR

EY

2D

T1-H

DB

3OU

T

DT2

-HD

B3O

UT

DT2

-HD

B3I

NW

HIT

E6

BR

OW

N

WH

ITE

GR

EE

N5

DT2

-HD

B3O

UT

SLA

VE F

RA

ME

RW

C C

AR

D S

LOT

17

700m

m

MODU

LE 2

34

21

FOR

GR

OU

ND

ING

RIN

G T

ER

MIN

AL

RW

C C

AR

D S

LOT

10S

LAVE

FR

AM

E

DTU

FR

AM

E (S

LOT-

2)

DIG

ITA

L C

AB

LE

SH

IELD

ED

TW

ISTE

D P

AIR

MO

DU

LE 1

:1 ,

MO

DU

LE 2

:1

PO

LAR

ITY

TA

BS

TO

BE

RE

TAIN

ED

AS

GIV

EN

BE

LOW

4.

THE

WIR

E L

EN

GTH

SH

ALL

BE

AS

SH

OW

N IN

TH

E F

IGU

RE

.

L =

15 M

Ts (M

AX)

MO

DU

LE 1

CA

BLE

MA

RK

ER

FIG

.FI

G.

SE

E N

OTE

2

3 4

700m

m

(WIR

E W

RA

P T

YP

E)

PO

LAR

ISE

D H

OO

DC

ON

TAC

T B

LOC

K2

1

`A' R

OW

DT1

-HD

B3O

UT

DT1

-HD

B3I

NW

HIT

E3

WH

ITE

2

1O

RA

NG

E

BLU

E

NA

ME

SIG

NA

L`C

' RO

WN

O.

PIN

NO

.M

OD

ULE

3.

WIR

E W

RA

P T

HE

PA

IRS

ON

TO

CO

NTA

CT

BLO

CK

PIN

S (F

IG. 1

) OF

EA

CH

MO

DU

LEA

S P

ER

WIR

ING

DE

TAIL

S G

IVE

N.

SN

AP

TH

E H

OO

D (F

IG. 2

) ON

TO

TH

E C

ON

TAC

T B

LOC

K (F

IG. 1

) SU

CH

TH

AT

PO

LAR

ITY

TA

B (1

) IS

TO

WA

RD

S P

IN 1

AS

PE

R W

IRIN

G D

ON

E.

TO M

DF

DT

1 2

20

2.1.N

OTE

S:



FIG

. 6.1

0 (b

)D

IGIT

AL T

RU

NK

CAB

LE T

ERM

INAT

ION

(SLA

VE

FRAM

E)G

ND

CH

ASIS

MAR

KER

CAB

LED

T2

TO M

DF

1710

\DE

SIG

N\2

56R

X-IM

\2R

IMC

L10

CABLE MARKER DT 1

1

2423

222121

2223

24

TO M

DF

B R

OW

CO

NN

.

SLAV

E FR

AME

MAS

TER

FR

AME:

SOU

RC

E P

LAC

EMEN

TD

ESTI

NAT

ION

PLA

CE

MEN

TC

ABLE

MAR

KER

DT

: SLO

T N

O. 2

1A: M

DF

A R

OW

CO

NN

.

B R

OW

CO

NN

.

A R

OW

CO

NN

.

: MD

F: S

LOT

NO

. 21A

DT

C

ABLE

MAR

KER

DES

TIN

ATIO

N P

LAC

EM

ENT

SOU

RC

E P

LAC

EMEN

TR

EAR

VIE

WM

ASTE

R F

RAM

E

SLAV

E FR

AME

2625

122

125

26

Chapter 6

56 C-DOT 256P RAX

6.2.3.1. Input Power

C-DOT 256 RAX operates with the standard power supply voltage of -48V 4 V DC. Float charger (with a standby DC battery) output of -48V DC is fed to the power distribution panel circuitry. A high current carrying 2-core cable is used from the float charger to the PDP input. Fig. 6.11 shows the cable details. The colour coding for this power cable is as below:

RED = GROUND

BLACK = 48V DC

The input power connection to the PDP is mentioned clearly in Fig. 6.12.

6.2.3.2. Power Distribution Panel (PDP) Circuit

All the primary power required for the system is distributed by the PDP circuitry. The power from the float charger is fed to four filter circuits through a HRC fuse. There is a visual indication for the input power. All the filter circuits are incorporated on the child cards, which in turn are connected to the PDP mother board. The four filter circuits will generate the primary power for the Copy 0 and Copy 1 PSU cards, voice and ring for the master and slave frames. All the filter circuits are provided with a fuse and LED indication. Any fuse failure will generate an audio buzzer sound and visual indication. There is a provision to disable the audio sound by operating a toggle switch. All the filter outputs are connectorised. The buzzer and the sensing circuitry will get the power from the input -48V DC through a fuse. In addition, there is one more 4 pin connector which will provide the power to maintenance panel through a fuse.

6.2.3.3. Master and Slave Frame Power

Basically three types of -48V DC is required as a primary power to the master and slave frames. They are Load power (-48V DC), Voice power (-48V DC) and Ring power (-48V DC). Two load powers derived from two separate filters are connected to Copy 0 and Copy 1 of master and slave frames. At the PDP side the cables are connected to the 4-pin male connector and at the mother board side they are terminated with the four way male header power connector.



PDP

POW

ER IN

PUT

CAB

LEFI

G. 6

.11

\DE

SIG

N\2

56R

X-IM

\2R

I-CL1

1

DES

TIN

ATIO

N P

DP

2.5

mm

PVC

INSU

LATE

D C

U C

ABLE

-48V

GN

D

SOU

RC

E FL

OAT

CH

ARG

ER

2.5

mm

PVC

INSU

LATE

D C

U C

ABLE

2R

ED

BLAC

K

-48V

2 C

OR

E M

ULT

ISTR

AND

CAB

LE

CAB

LE L

ENG

TH =

20

MTs

(MAX

)

CAB

LE M

ARKE

R"P

RD

"

2

RO

UN

D L

UG

Chapter 6

58 C-DOT 256P RAX

FIG

. 6.1

2IN

PUT

POW

ER P

OSI

TIO

NS

IN T

HE

PDP

\DE

SIG

N\2

56R

X-IM

\2R

I-CL1

2



FILTER 1: YELLOW YELLOW WITH GREEN STRIPES

=

=

-48V DC GROUND

} } }

MASTER FRAME COPY 0

BLUE RED

=

=

-48V DC GROUND

} }

SLAVE FRAME COPY 0

FILTER 2: RED = -48V DC } }

MASTER FRAME COPY 0

BLACK = -48V DC } }

SLAVE FRAME RING


=

=

48V DC GROUND

} } }

MASTER FRAME VOICE

BLUE RED

=

=

-48V DC GROUND

} }

SLAVE FRAME VOICE


=

=

-48V DC GROUND

} } }

MASTER FRAME COPY 1

BLUE RED

=

=

-48V DC GROUND

} }

SLAVE FRAME COPY 1

Viewing from the rear side of the cabinet, FILTER 1 and FILTER 2 power cables are routed along the right side of the cabinet, FILTER 3 and FILTER 4 power cables are routed along the left side of the cabinet. The maintenance panel power cable is routed along the right side of the cabinet.

All the required secondary voltages like +5V, -12V, -9V, +12V and 75V RMS are generated by the power supply cards. All these voltage buses run along the mother board. The subscriber voltage bus is connected to Voice -48V DC. The ringer bus is connected to Ring -48V DC.

6.2.4. Maintenance Panel Power Cable

The primary power to the maintenance panel is supplied from the PDP. A 2-core power cable is used to supply the power to maintenance panel. PDP side of the power cable is connected to a 4-pin male connector and the MP side is connected with a 4 pin female connector. The colour coding of the cable is as below:

RED = GROUND

BLACK = 48V DC

This power cable is tied along with the maintenance panel cable (7x2 pair round cable) and connected to the MP as shown in Figure 6.13.

All the voltages required for the MP operation are derived from this primary power of -48V DC.

Chapter 6

60 C-DOT 256P RAX

FIG

. 6.1

3M

AIN

TEN

ANC

E PA

NEL

PO

WER

& IN

TER

FAC

E C

ABLE

\DE

SIG

N\2

56R

X-IM

\2R

I-CL1

3

A R

OW

CO

NN

.

B R

OW

CO

NN

.

B R

OW

CO

NN

.

A R

OW

CO

NN

.

TO M

.P

TO M

.P

(MAL

E)25

PIN

D-C

ON

N.

4 PI

N C

ON

N.

CAB

LE T

IE

FRO

M P

DP

CAB

LE M

ARKE

R

MAI

NTE

NAN

CE

PAN

EL

INTE

RFA

CE

CAB

LE

: SLO

T N

O.2

A (F

IRST

7x2

OU

TLET

) OF

MAS

TER

FR

AME

: MAI

NTE

NAN

CE

PAN

EL: M

P00

CAB

LE M

ARKE

RD

ESTI

NAT

ION

PLA

CE

MEN

TSO

UR

CE

PLA

CEM

ENT

REA

R V

IEW

MAS

TER

FR

AME

SLAV

E FR

AME

2625

122

125

26



6.2.5. Maintenance Panel Cable

RAX Administrative processor (RAP) (Copy 0 and Copy 1) RS232 signals from the master frame connector 2A to maintenance panel are brought out through a 7x2 round cable. In addition, a 2-core power cable is used to carry the power from the PDP to maintenance panel. (Ref. Fig. 6.13).

6.2.6. Grounding Scheme

The grounding scheme for the 256 RAX follows the concept of SINGLE-POINT GROUNDING. This scheme uses MASTER GROUND POINT to provide a zero reference potential to ground for the entire system. The master ground point is located at the back of RAX, where all the ground reference points within the system and from the MDF are commoned.

The power, system and signal grounds existing within the system, mother board ground of master frame, mother board ground of a slave frame, cable entry power supply ground, MDF protection assembly ground and all the accessible and exposed metallic elements like the system frame, cabinet iron framework, PDP chassis are commoned at the master ground point at master ground bus bar at the bottom of RAX on the back side as shown in Fig. 6.14.

The wires used for all the grounding purpose is a multi-strand single core of BLACK colour (48 strands of 0.2 mm each).

Mother board ground wire of master and slave frame has a round lug on master ground bus bar point side and fast on-tab on mother board side. All other ground wires have lugs on both the sides. Refer Fig. 6.15 for MDF-Ground Bus Bar cable details.

Note: Ensure that -48V GND from PDP (Cable GGR2) terminated on RAX Ground Bus Bar.

At the backplane of the mother board, the Ground for +5V DC (is referred as the SIGNAL GROUND) of all the card GROUND pins are terminated on the tin plated copper bus bar of rectangular cross-section.

A low-resistance copper conductor is used to connect the master ground bus bar at MDF to the earth. The connection to earth may be a simple driver ground rod through chemically treated or untreated wet soil. A black wire from this to master ground baris connected to MDF protector assembly ground (Fig 6.14).

Chapter 6

62 C-DOT 256P RAX

(RAX GROUND BUS BAR)SYSTEM GROUNDING TERMINATIONS

FIG. 6.14

\DESIGN\256RX-IM\2RIM-SGT

MARKERCABLE

GGR

GROUNDDIGITAL

TO MASTER

TO SLAVEDIGITALGROUND

1GGR

TO CHASSIS

GGR3

GGR GGR1 GGR3

BUS BARTO EARTH

4GGR

SYSTEMGROUND

FREE FOR FUTUREEXPANSION

CHASSISGROUND GND

-48VSLAVEDIGITALGROUNDGROUND

DIGITALMASTER



RAX

EAR

TH B

US

BAR

- G

RO

UN

D B

US

BAR

CAB

LE (G

GR

4)FI

G. 6

.15

\DE

SIG

N\2

56R

X-IM

\2R

IM-G

CL

MAX

= S

ITE

DE

PEN

DE

NT

CA

BLE

LEN

GTH

PVC

INS

ULA

TED

2.5

mm

CAB

LE M

ARKE

R

GG

R4

(BLA

CK)

2

(NE

AR E

ARTH

PIT

)

TOW

ARD

SG

GR

4

BAR

EW

IRE

MAS

TER

EAR

TH P

OIN

T

RIN

G T

ON

GU

E T

ERM

INAL

Chapter 6

64 C-DOT 256P RAX

6.2.7. RNS Cables The following cables are needed for using RNS card:

a) RNS digital trunk cable (ACB-RNSXDTRX-000)

This cable connects RNS card to the digital trunk input on MDF (which is chosen as reference for synchronization). Details of the cable are shown in Fig.6.14a.

b) RNS 8MHz clock & sync O/P cable (ACB-RNSCKSCX-000)

These are two cables (X can take value as 0, 1), and are used one for connecting 8MHz clock & sync O/P from RNS to copy O RAP, & the other for copy 1 RAP. Details are shown in fig. 6.17(a), (b), (c).

6.2.8. Mother Board Wiring for RWC Cables

Following wires are to be provided on SLAVE motherboard when using RWC Card.

S.No. Signal Name Signal Origination Card Name

From Slot No./ Pin No.

To Slot No./ Pin No.

Remarks

1. C0-32-D-A-E LCC 21/Ba11 17/Aa20

2. C1-32-D-AE LCC 21/Bc11 17/Aa21

DT2 voice I/P to RWC at Slot 17

3. C0-32-A-DE RWC 22/Bc22 17/Ac20

4. C1-32-A-DE RWC 21/Bc22 17/Ac21

DT2 voice O/P to RWC at Slot 17

5. C0-32-D-A-E LCC 6/Ba11 10/Aa20

6. C1-32-D-A-E LCC 6/Bc11 10/Aa21

DT2 voice I/P to RWC at Slot 10

7. C0-32-A-D-E RWC 6/Bc22 10/Ac20

8. C1-32-A-D-E RWC 6/Ba22 10/Ac21

DT2 voice O/P from RWC at Slot 10

6.3. CABLE ROUTING

All the cables (termination cables, maintenance panel cable, power cable and ground cable) are routed vertically with the help of the two tier cable clamps. The cable clamps will be mounted one above the other and reinforced with a cover plate and screws.

Each cable clamp consists of one bigger slot and one smaller slot. The bigger slots are used exclusively to route 32x2 pair round cables. The smaller slots areused to route power, ground and maintenance panel cables. The following sections will describe the routing of termination cables, inter-frame cables, maintenance panel cables, power cables and ground Cables.



The cross sectional view of the right side and left side cable trays are shown clearly in Fig. 6.16 and it shows the routing of all the cables on left hand side & right hand side cable tray with cable ties.

6.3.1. Termination Cable Routing

A total of Fourteen 32 pair round cables are used as termination cables in the system.

They are as follows:

4 E&M cables from the master frame

4 E&M cables from the slave frame

3 trunk/subscriber cables from the master frame

3 trunk/subscriber cables from the slave frame

Viewing from the rear side of the cabinet, the E&M cables are routed on the right side. The master frame E&M cables are accommodated on the top layer of the cable clamp and the slave frame E&M cables are accommodated on the bottom layer of cable clamp. The 2 way trunk/subscriber cables are routed on the left side of the cabinet. The master frame 2-way trunk/subscriber cables are accommodated on the top layer of the cable clamp and the slave frame 2 way trunk/subscriber cables on the bottom layer. Cable ties are used at the front edge of the horizontal plate for all the cables. 2 way trunk/local subscriber cables are divided into 4 groups of 8 pair each at the horizontal plate and routed to the appropriate connectors. Fig. 6.16 shows the complete details of all the EMF cable routing and termination cable routing

Documents

256 Instln Manual