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GSM-R user procedures (cab radio Version 2)

GSM-R GB

1A26

Emergency Group

Calling

GSM-R GB

1A26

Emergency Group

Connected PTT

Once the call is connected, you must follow the emergency call procedure.

GSM-R GB

1A26

Emergency Group

Connected Speak

You must release the PTT after passing your message in order to hear the signaller or allow

another mobile user or signaller to speak – remember; PRESS TO TALK, RELEASE TO

LISTEN.

Only the person making the call, or the signaller, should speak during the call. If you

receive a railway emergency group call that has been made by another driver, you should

only speak if asked to do so by the signaller or if you have something important to add

about the emergency.

 If for some reason, another cab radio or handportable user has taken control of the

voice connection to the signaller, you will not be able to speak until the other user

releases their PTT. In this case, at the end of the short confirmation tone you will

hear a ‘busy’ tone and see the message “busy” on the cab radio display. Holding

down the PTT until the other user releases their PTT will not work. You have to

release your PTT and press it again when you see the “PTT” prompt.

Only the person who made the call, or a signaller, can end the railway emergency group

call once it has been initiated. However, once underway the emergency situation must be

managed by the signaller and so should be terminated by the signaller.

 Returning the handset to the cradle will not end an emergency call, it will switch the

speech from the handset to the loudspeaker.

The cab radio shows that the railway emergency

group voice call has been made and the red button

‘flashes’.

Once the call is made, you will hear an

emergency annunciated warning tone from the

loudspeaker for five seconds (“Connecting

emergency group”, when connected use press to

talk). You should not start to communicate until

the warning tone ends and you see the message

PTT.

Press the PTT (when you see the prompt) and

after the short confirmation tone of approximately

one second, the cab radio will display “Speak”.

You can then pass your message.

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