Avaya BCM 4.0 Networking Guia de Configuração descarregar pdf (Página 110)

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110 Chapter 6 Configuring resources — media bay modules

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Figure 25 Example of PRI module settings

Determining clock sources for DTMs or BRIs

Use the clock source list to designate the DTM or BRI on the system that obtains the timing

reference for synchronization from the network.

Systems with digital interfaces need to synchronize to the network in order to function.

Synchronization follows a hierarchical path. Each device (switch) obtains the network clock from

the device above it in the synchronization hierarchy. The device then passes the network clock to

the device below it in the synchronization hierarchy. The synchronization levels are referred to as

strata.

BCM systems are stratum 4E equipment and are usually used as termination points in a network.

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 reference from the network and the

system synchronizes to it. This is the default value for the first DTM in a BCM. Note that 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. 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 reference 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 should be no Secondary reference defined on any

DTM/BRI. Note that there should only be one defined Secondary clock source on a system.

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