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Level Crossing Gate Communiation system on Indian Railways for Greater safety of Road and Rail users
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1©AE Telelink Systems Ltd.– Proprietary and confidential
INDIAN RAILWAY SIGNALLING
LEVEL CROSSING GATE CONTROL EQUIPMENT using
WIRED / WIRELESS Data Communications
2©AE Telelink Systems Ltd.– Proprietary and confidential
LC Gate Control Equipment
• Developed by Joint Effort of Three directorates of RDSO Lucknow
—Telecom Directorate
—Traffic Directorate
—Track Design Directorate
And
—AE Telelink Systems Ltd.-New Delhi
• Designed for ‘Manned Level Crossing Gates’
3©AE Telelink Systems Ltd.– Proprietary and confidential
Problems Encountered In Existing Manned LC Gate Control System
• Excessive messaging time between station master and gate man
—Existing system is based on spoken communication between Station Master and Gate Man over telephone line which is time consuming.
• Lack of alternate/back-up communication medium
—In case the cable connecting the station and LC gate is unavailable due to breakage, theft etc. there is no alternate means of communication.
• No accountability of personnel communications and actions.
—No provision for recordkeeping
4©AE Telelink Systems Ltd.– Proprietary and confidential
This LC Gate Control System was designed to solve all these issues while keeping in mind the following:
• No change to the communication protocol i.e. use
the existing ‘private number exchange system’.
• Must not be complicated to use i.e. the existing staff should be able to adopt it with ease and minimal training.
• Must deliver messages in the voice form and in local language.
• At any time voice communication between the station master and gate man must be possible.
5©AE Telelink Systems Ltd.– Proprietary and confidential
LC Gate System Solution• Reduces transaction time between the station
master and gate man as they only need to choose among a predefined set of messages.
― Message is encoded and transmitted in digital form.
― Message is played in voice form and also displayed on equipment’s LCD screen.
• Alternate Wireless Medium is provided in addition to existing 2-wire medium.
― Dynamic switching between wired and wireless medium. If both mediums are available then wired medium will be used.
― This feature will also enable use of this system for gates where there is no wire link between the station and LC gates.
• Accountability is provided through this system.
― The equipment records details of each message event like Time & Date of transmission ,Gate ID,PVT No., Train Number etc. Upto 1,00,000 events can be stored.
― The system has a facility to take a hard copy of the log through the systems printer port.
6©AE Telelink Systems Ltd.– Proprietary and confidential
LC Gate System – Salient features• Extremely simple to operate
• To provide the mentioned advantages only the mode of message transmission has changed.
• No change in communication protocol between station master and gate man therefore no re-learning needed.
• Reception of message is same as before i.e. voice based and in local language ( in addition to English).
• Voice communication is always available as a standby.
7©AE Telelink Systems Ltd.– Proprietary and confidential
Level Crossing Control System
Wireless -Radio Link
01
Gate ID-01 Gate ID-02 Gate ID-N
Wired – Telephone link
LC GATE CONTROLLER
LC GATE EQUIPMENT (upto 99 gates)
Note: Radio is integrated in Unit.
8©AE Telelink Systems Ltd.– Proprietary and confidential
LC GATE CONTROLLER
LC GATE EQUIPMENT
vs
• They look similar but differ in
— The facilities supported
Each equipment supports only the needed functionality in order to make the system very simple to operate.
— Keys on the key Panel ; and
— LEDs on the box
• This will become more clear during the demonstration.
Ack Close Radio Mode
PTT OpenAck Open/ Close
Radio Mode
PTT Problem
Advice
Close
Open
Msg
1/Up 2/Dn Close
Problem
Open
Msg
1 23 Send
4 5 6
7 8 9
0
Config
Ack
3 Send
4 5 6
7 8 9
0
Config
Ack
9©AE Telelink Systems Ltd.– Proprietary and confidential
Task of Station Master Task of Gate Man
— Acknowledge (private number exchange)
— Advice
— Order gate close
— Permit gate open
— Disallow gate open
— Query gate position for interlocked gates
— Broad cast any message to a group
— Acknowledge message (private number exchange)
— Confirm gate close
— Request for Gate open
— Inform station master about problem
10©AE Telelink Systems Ltd.– Proprietary and confidential
Additional Benefits
• Data is sent only to intended receiver using the Gate ID.
• Data Transmission consumes very little power because it is encoded and requires very little transmission time.
• Data in digitized form during transmission and therefore provides reasonable security/secrecy of message.
• Private No Exchange scheme as per Railway Board directive remains unchanged.
• Three sources of power are provided using Electric, Battery and Solar Panel.
• Printer port to take hard copy of logged events.
• Hardware lock for security.
• Integrated wireless support.
• Night lamp for operation in dark environments.
• Auto-detection of gate interlock position.
• Broadcast messaging.
11©AE Telelink Systems Ltd.– Proprietary and confidential
This System Supports All Kinds of Manned Gates
Manned Gates
Engineering Gates
Traffic Gates
Interlocked
Non-interlocked Interlocked
Non-interlocked
Open to traffic
Closed to
traffic
Open to traffic
Closed to
traffic Open to traffic
Closed to
traffic
Open to traffic
Closed to
traffic
Gates highlighted in blue are covered in the LC gate control system
12©AE Telelink Systems Ltd.– Proprietary and confidential
‘Open to traffic’ Gates - Advice
• For these kinds of gates the communications is initiated by the station master under exchange of private number scheme.
LC GATE CONTROLLER – Station Master
LC GATE Equipment – Gate Man
Advice : •Pvt. No•Gate No.• Est. Time• Up/ Dn •Train No.
Send:
Ack to Mute
•Pvt. No.
Send:
Transaction Complete
13©AE Telelink Systems Ltd.– Proprietary and confidential
‘Open to traffic’ Gates - Close
• For these kinds of gates the communications is initiated by the station master under exchange if private number scheme.
LC GATE CONTROLLER – Station Master
LC GATE Equipment – Gate Man
Close : •Pvt. No•Gate No.• Up/ Dn •Train No.
Send:Ack to Mute
•Pvt. No.
Send:
Physically Close the Gate
Close : OR Problem:•Pvt. No
Send:
Transaction Complete
•Pvt. No
Send:
14©AE Telelink Systems Ltd.– Proprietary and confidential
‘Closed to traffic’ Gates - Open
• For these kinds of gates the communications is initiated by the Gate Man.
LC GATE CONTROLLER – Station Master
LC GATE Equipment – Gate Man
Open :
Send:
Ack to Mute
Open : OR Msg 2 (Do not Open)
•Pvt. No
•Gate No.
Send:Physically Open the Gate (if open allowed)
Physically Close the Gate
Close : •Pvt. No
Send:
Transaction Complete
•Pvt. No
Send:
15©AE Telelink Systems Ltd.– Proprietary and confidential
Any Gate - Problem
• The Gate man informs the station master of a problem at the gate.
LC GATE CONTROLLER – Station Master
LC GATE Equipment – Gate Man
Problem :
•Pvt. No.Send:
Ack to Mute
•Pvt. No
Send:
Transaction Complete
Ack to Mute
16©AE Telelink Systems Ltd.– Proprietary and confidential
Station Master – Message to Any Gate
• The station master sends a message to the gate man.
LC GATE CONTROLLER – Station Master
LC GATE Equipment – Gate Man
Ack to Mute
Transaction Complete
Ack to Mute
Msg: (1-Query gate relay position)
(2 – Do not open gate)
•Pvt. No
Send:
17©AE Telelink Systems Ltd.– Proprietary and confidential
Station Master – Group Messaging• The station master sends a message (Close/Open/Advice/Msg) to a
group of gates.
• If the Gate ID sent is 98 it is all the down gates. If the Gate ID sent is 99 it is all the up gates.
LC GATE CONTROLLER – Station Master
LC GATE Equipment – Gate Man
•Pvt. No.Send:
Ack to Mute
Transaction Complete
Ack to Mute
Close/Open/Advice/Msg:
•Pvt. No
•Gate ID: 99 or 98
Send:
•Pvt. No.Send:
•Pvt. No.Send:
Response by gate A
Response by gate B
Response by gate N
18©AE Telelink Systems Ltd.– Proprietary and confidential
• LC Gate Controller
— Ack
Off – No message to be transmitted
On – Message waiting to be transmitted
Blink – Message successfully sent.
— Open/Close
On- (Open request)/(Close confirm) received.
Off – No pending open/close received message.
— Radio Mode
Off – wire connection present. On – wire connection absent,
transmission on wireless.
— PTT (Only applicable in Radio mode)
On – Radio transmission on. Off – Radio transmission off.
— Problem
On – Problem message received from gate.
Off – No problem message from gate pending.
• LC Gate Equipment
— Ack
Off – No message to be transmitted
On – Message waiting to be transmitted
Blink – Message successfully sent.
— Close
On – Close order received.
Off – No close order pending from controller.
— Radio Mode
Off – wire connection present.
On – wire connection absent, transmission on wireless.
— PTT (Only applicable in Radio mode)
On – Radio transmission on.
Off – Radio transmission off.
— Open
On – Open order received.
Off – No open order pending from controller.
LED Description
19©AE Telelink Systems Ltd.– Proprietary and confidential
Specifications• Input
— AC 220v, 50Hz
• Operation Voltage
— 12V DC
• Battery Backup
— 12V/65 AH SMF
• Medium
— Wireless ,Two Wire
• Solar Panel
— 12v/70w with charging current 3A@17v.
• Night lamp
• Hardware key for operation/lock.
• Radio Interface
Receiver output
Modulation Input
Carrier Present Logic
Transmitter Keying Output
• Logged Event – More than 100000
• Printer Port- 25 pin D connector
• Gate Position Input
— Potential free input
— Open for gate open
— Close for gate close
20©AE Telelink Systems Ltd.– Proprietary and confidential
THANK YOU