Siemens NRN 67 Series Specifikace stáhnout pdf (Strana 15)

RSSB Page 15 of 87

GSM-R user procedures (cab radio Version 2)

2.5 Call routing

The GSM-R network uses a series of base stations located alongside the railway to

provide radio coverage. The coverage associated with each base station is commonly

known as a cell area.

In most instances each cell will have only one signaller. In these instances the GSM-R

network can route any calls or operational text messages sent from a cab radio to the

correct signaller.

However in some instances, there will be more than one signaller controlling train

movements within the same GSM-R cell area, for example, where responsibility transfers

from one signal box (or panel) to another. In these areas the GSM-R network will not be

able to tell the difference between signallers and will need extra information to allow it to

route calls to the correct signaller for the train making the call.

The GSM-R network will gather this extra information from the signalling system, using the

train’s last reported position stored in the signalling system, to route the call. This is

known as signalling system-based call routing.

On routes where signalling system-based call routing is not provided, the GSM-R network

will route any calls or operational text messages sent from a cab radio to a ‘Nominated

Signaller’. This person may not be the signaller who controls the area for that train. At

certain signals on these routes, GSM-R signal box phone number plates will be provided

to show the driver that they must contact the signaller who controls the area by dialling the

GSM-R fixed terminal phone number (see 4.4) or short code ‘12nn’ number shown on the

sign, instead of using the standing at signal message or call signaller button.

 Signal box GSM-R fixed terminal telephone numbers will be published in the Weekly

Operating Notice (WON) and are also held in the cab radio Network Rail telephone

book.

In addition, at those signals/locations identified above, urgent point-to-point calls made

using the yellow button will be routed to a ‘Nominated Signaller’, who may or may not be

the signaller who controls the area. The ‘Nominated Signaller’ will take any immediate

actions required before telling the signaller who controls the area to contact the driver

concerned.

 To prevent vital caller identity information being lost the ‘Nominated Signaller’ is not

permitted to forward your call to the signaller who controls the area.

2.6 Call priorities

The GSM-R network, as with any mobile phone network, has a limit to how many calls it

can take. With this in mind, the system will prioritise different types of calls. For example,

emergency or urgent calls will be connected, possibly at the expense of normal operational

calls.

 If your call is automatically terminated due to a higher priority call being received by

the person to whom you are talking, you will not receive any prior warning but you will

see “Terminating” displayed on the screen.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 86 87

Žádné komentáře

Siemens NRN 67 Series Specifikace Strana 15