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GSM-R user procedures (cab radio Version 2)

3 GSM-R system users

The main purpose of GSM-R is to provide secure communications between train drivers

and signallers. However, the following people are also likely to use the system:

 Signal box supervisors.

 Network Rail operations controllers.

 Electrical control operators (ECO).

 Train operator controllers.

 Guards.

 Other on-train staff.

 Shunters.

 Trackside workers.

The GSM-R system should be used only in line with instructions shown in GE/RT8000,

Rule Book.

3.1 User equipment

3.1.1 Fixed terminal equipment

Signal boxes, Network Rail operations control offices and electrical control rooms have

GSM-R fixed terminals, allowing calls and text messaging, connected to the MSC through

the Network Rail fixed telecommunications network. In some signal boxes the signal box

supervisor will also have a fixed terminal.

The fixed terminal gives the signaller and controller a list of all the users registered in the

signaller’s controlling area. Each registered cab radio will be identified by the TRN. The

fixed terminal includes a handset for normal two-way voice communications plus a PTT

button, a loudspeaker and display.

If you use a fixed terminal you will need to use the PTT for all types of calls. If you use a

cab radio, you will use the PTT for group calls only.

 Signallers and controllers have the facility to override a cab mobile user and interrupt

if required. This is likely to occur when a cab mobile user has finished speaking but

has not released the PTT on the handset to allow other to speak.

When this facility is used, the cab mobile user will hear their speech played back to them

in the form of an echo (commonly termed “Talker echo”). This is not apparent to the fixed

terminal user whose only indication may be the cab mobile user having difficulty in

completing their communication.

Strict adherence to voice protocols will stop this event happening accidentally (ie wait for

the sender to complete their message before responding and release the PTT when

finished talking).

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Siemens NRN 67 Series Especificaciones Pagina 17