Control Communication

8/10/2019 Control Communication

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Train Traffic Control (TTC)

Communication

Ch Vasudev/ICT1/IRISET



Basic block in Control Commn

• A division is the basis for providing CC

• For this purpose

– A control Office is setup at each divisional

headquarters station in a railway zone

– Then, individual telephone communication

links are provided between each controller in

the CO and all wayside stations/cabins/locosheds etc., under his control.

– Each of these telephone communication

links is known as a Control Circuit.



Control Office

•The control office is considered as the nervecenter of Divisional Operating organization.

• In a Railway zone for every division one Control

Office is provided at its divisional headquarters

office.• Apart from the Divisional control offices, the

following are also provided if traffic needs

demand

– Sub-control office- Where the traffic density justifies,

separate organization for controlling and regulating

traffic in a limited portion of the division.

– Area Control office- at areas of exceptionally

industrial or commercial importance.



Types of Control Circuits

Different types of control circuits:• Section Control / Train Control Circuit

• Deputy Control Circuit

• Loco Power Control Circuit• Traction Loco Control Circuit

• Traction Power Control Circuit

• Emergency Control Circuit• Engineering Control

• Maintenance Order Wire Control



Following Means can be used for

providing Control Communication

• 2-wire overhead line

– Which can be used in non-electrified areas

only. This is now almost obsolete

• 4-wire (Quad) line in an under ground

(UG) cable – For electrified (RE) areas or

– Which is in extensive use at present

• A telephone channel on a OFC

communication system

– Which is gradually replacing UG cable system



Nature of control circuit

• Irrespective of the type of medium

(overhead line/ under ground cable/ OFC)

all control circuits are of OMNIBUS in

nature

• Omnibus means a common means for

all the users. All users (controller and

wayside station masters are connected inparallel to a common communication

line.



Omnibus Circuit Concept

CO

Eqpt

Stn-1

Control

Office

WS

Eqpt

WS

Eqpt

WS

Eqpt

WS

Eqpt

WS

Eqpt

Stn- 2 Stn-3 Stn-4 Stn-n

CO- Control office

WS- way station

Eqpt- EquipmentStn- station



Selective Calling

• Selective calling is the name given to thetechnique used for calling (signaling) an

individual subscriber on an Omnibus

communication link.

• IR employed the following types of selectivecalling methods, so far, in TTC communication

– High Voltage DC impulses

– Low voltage AC impulses – DTMF ( Dual Tone Multi Frequency) tones

• Only DTMF technology is in use at present.



Type of Equipment used

• DTMF Control office Equipment

– Used by Controller

• DTMF Way station Equipment

– Used by Station Masters, along the route

– It consists of

1) Control Telephone and

2) DTMF decoder

( In selective calling method it is required to produce

telephone ringing signal locally)



Types of TTC Communication Systems

1) Under Ground Quad cable system – Conventional System- uses CO equipment,

Way station equipment and additionally VF

repeater at 50 km intervals along the cable

route.

– Equaliser Amplifier System- uses CO

equipment and VF repeater of Equaliser

Amplifier type at every way station• It offers 8-line Local Intercom & Remote

monitoring facilities which were not there in

conventional system



Types of TTC Systems…. continued

2) CCEO (Control Communication Equipment

for OFC) system

– As the name implies this system is meant for

use with OFC medium. It comprises the

following segments – CRE- Control Room Eqpt

– TRE- Test Room Eqpt

– LTE- Local Telephone Eqpt

– MTWE - Multi Telephone Way station Eqpt

– TDCT- 2wire Dialing Control Telephone

– RPE- Remote Patch Eqpt

– TWA- Three Way Amplifier



Use of different control circuits

Section Control / Train Control (SC)

This is provided for communication between the

section/train controller in the control office and

way side stations, junction stations, blockcabins, loco sheds and yards in a division for the

control of train movements and effective

utilization of section capacity.



Deputy Control

• This is provided for communication between the

Deputy Controller in the control office and

important stations, junctions and terminal

stations, yard master’s offices, loco sheds andimportant signal cabins in a division for

supervisory purpose.



Traction Loco Control (TLC)

• This is a special circuit in the electrified(RE)sections and is provided for communication

between the Traction Loco Controller in the CO

and the electric loco sheds, station master’s

offices at junctions and terminal stations, yards

masters’, Divisional Officers and Traffic Control

Officer in a division for the optimum utilization of

electric locomotives.• This is analogous to Loco Power Control in

Diesel Traction Areas.



Traction Power Control (TPC)

• This is a special circuit in the electrified(RE)

sections and is provided for communication

between the Traction Power Controller in the

control office and station masters’ offices, gridstation’s, feeding posts, sectioning posts, sub-

sectioning posts, important signal cabins,

divisional officers and traffic control offices in a

division to facilitate efficient maintenance ofoperation of the electric overhead system.



Emergency Control

• This is also a special circuit in the RE sections

and is provided from a point at every kilo meter

along the track for communication between the

train crew in emergencies, traction andpermanent way maintenance staff, and the

control office.



Engineering Control

• This circuit is provided for the use of Engineering

Department for its maintenance and day to day

repair purposes. This is connected to Permanent

Way(PW) offices along the track.



Thank you

Control Communication

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