Avaya BCM50 User Manual download pdf (Page 40)

BCM50 System Start Up

40 NN40010-318 Issue 1.2 BCM50 Rls 6.0

2. In this example the system has a single PRI Digital Trunk Media Bay

Module installed and the clock source has been set to Primary External

to reflect this. The protocol should also be set as required. In this

example Euro has been selected (other options are SL-1 and QSIG).

Clock Sources and Digital Trunk Modules

For each DTM and BRI, choose one of the following settings: Primary

external, Secondary external, or Internal:

 Primary external: The DTM/BRI obtains the timing from the network

and the system synchronizes to it. This is the default value for the first

DTM in a BCM. There should only be one defined Primary clock source

on a System. Private network: If this system is in a private network

and is intended to provide the master clock for that private network, the

system must have one, and only one, Primary clock reference on a

DTM or BRI. If this system is intended to act as clock master in a

private network, then all clock sources should be set to Timing Master

on this system.

 Secondary external: The DTM/BRI acts as a standby reference point.

If there are excessive errors on the Primary reference link, or the

DTM/BRI designated as Primary reference fails, the Secondary

DTM/BRI obtains the timing from the network to be used for system

synchronization. This is the default value for the second DTM in a

BCM. Private network: If this system is in a private network and is

intended to provide the Master clock for that private network, then there

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Avaya BCM50 User Manual Page 40