railway lc gate pn system

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INDIAN RAILWAY SIGNALLING

LEVEL CROSSING GATE CONTROL EQUIPMENT using

WIRED / WIRELESS Data Communications

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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’

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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

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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.

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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.

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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.

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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.

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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

Print

Ack

3 Send

4 5 6

7 8 9

0

Config

Print

Ack

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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

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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

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‘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

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‘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:

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‘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:

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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

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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:

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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

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• 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

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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

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