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GSM-R user procedures (cab radio Version 2)

An alternative method has been developed to

avoid a driver having to dial the long form 8-

digit number. This is achieved by dialling a

short code 12nn (the value of ‘nn’ will be

allocated on a location specific basis to allow

the call to be directed to the correct signaller).

A sign (see Figure 8) will be provided on

affected signals displaying the correct

signaller’s GSM-R short code number, to tell

drivers about this.

Figure 8 – Example signal-box 12nn

short code plate

It is important to understand that the following functions will be affected at signals plated

with either a CT7 or 12nn sign:

4.4.1 Call signaller button

You must not use the ‘call signaller’ button, as the GSM-R network cannot be relied upon

to route the call to the correct signaller.

4.4.2 Urgent point-to-point calls (yellow button)

Drivers using the ‘yellow button’ to make an urgent point-to-point call will need to be aware

in certain areas not supported by signalling system based call routing, the call may not be

answered by the signaller who controls the area. As a result anyone involved in the call

must correctly identify who they are speaking to and come to a clear understanding. In

these incidents, the GSM-R network will route all urgent point-to-point calls to a

‘Nominated Signaller’.

To help with this, the signaller’s identity will be displayed on the cab radio display.

If an Urgent call is routed to a ‘Nominated Signaller’ who does not control the area, you

must stay in contact with the signaller until you have been assured that the correct

signaller will call you.

4.4.3 Standing at signal operational text message

In areas not supported by signalling system based call routing, you must not use the

‘standing at signal’ (SG) operational text message, as the GSM-R network cannot be relied

upon to route the message to the correct signaller.

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Siemens NRN 67 Series Especificaciones Pagina 21