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Issue 3 May 2009 649

Chapter 22: Setting synchronization

If the Avaya G450 Media Gateway contains an MM710 T1/E1 media module, it is advisable todefine the MM710 as the primary synchronization source for the G450. In so doing, clocksynchronization signals from the Central Office (CO) are used by the MM710 to synchronize alloperations of the G450. If no MM710 is present, it is not necessary to set synchronization.

Enter set sync interface primary|secondary mmID [ portID ] to define a potentialstratum clock source (T1/E1 Media Module, ISDN-BRI), where:

mmID is the Media Module ID of an MM stratum clock source of the form v n , where n is theMM slot number

portID is the port number for an ISDN clock source candidate. The port ID consists of theslot number of the media module and the number of the port. You can set more than one

port. For example, v2 1, 3, 5-8 .

Note:Note: The port ID parameter only applies if the source is a BRI module.

By setting the clock source to primary, normal failover will occur. The identity of the currentsynchronization source is not stored in persistent storage. Persistent storage is used topreserve the parameters set by this command.

Note:Note: Setting the source to secondary overrides normal failover, generates a trap, and

asserts a fault. Thus, it is only recommended to set the clock source to secondary

for testing purposes.To determine which reference source is the active source, use the set sync source

primary|secondary command. If you choose secondary , the secondary source becomesactive, and the primary source goes on standby. In addition, fallback to the primary source doesnot occur even when the primary source becomes available.

If neither primary nor secondary sources are identified, the local clock becomes the activesource.

The following example sets the MM710 media module located in slot 2 of the G450 chassis asthe primary clock synchronization source for the Avaya G450 Media Gateway.

set sync interface primary v2set sync source primary

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Setting synchronization

650 Administration for the Avaya G450 Media Gateway

If the Avaya G450 Media Gateway includes a second MM710 media module, enter the followingadditional command:

If, for any reason, the primary MM710 media module cannot function as the clocksynchronization source, the system uses the MM710 media module located in slot 3 of the

Avaya G450 Media Gateway chassis as the clock synchronization source. If neither MM710media module can function as the clock synchronization source, the system defaults to the localclock running on the S8300 Server.

To disassociate an interface previously specified as the primary or secondary clocksynchronization source, enter clear sync interface primary or clear syncinterface secondary .

To enable or disable automatic failover and failback between designated primary and secondarysynchronization sources, enter set sync switching enable or set sync switching

disable .

Synchronization statusThe yellow ACT LED on the front of the MM710 media module displays the synchronizationstatus of that module.

If the yellow ACT LED is solidly on or off, it has not been defined as a synchronizationsource. If it is on, one or more channels is active. If it is an ISDN facility, the D-channelcounts as an active channel and causes the yellow ACT LED to be on.

When the MM710 is operating as a clock synchronization source, the yellow ACT LEDindicates that the MM710 is the clock synchronization source by flashing at three secondintervals, as follows:

The yellow ACT LED is on for 2.8 seconds and off for 200 milliseconds if the MM710media module has been specified as a clock synchronization source and is receiving asignal that meets the minimum requirements for the interface

The yellow ACT LED is on for 200 milliseconds and off for 2.8 seconds if the MM710media module has been specified as a synchronization source and is not receiving asignal, or is receiving a signal that does not meet the minimum requirements for theinterface

set sync interface secondary v3set sync source secondary

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Synchronization status

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Displaying synchronization status

Enter show sync timing to display the status of the primary, secondary, and local clocksources. The status can be Active , Standby , or Not Configured . The status is Not

Configured when a source has not been defined, for example, when there are no T1 cardsinstalled.

Summary of synchronization commands

For more information about these commands, see Avaya G450 CLI Reference , 03-602056.

Table 146: Synchronization CLI commands

Command Description

clear syncinterface

Disassociate a previously specified interface as the primary orsecondary clock synchronization source

set syncinterface

Define the specified module and port as a potential source for clocksynchronization for the media gateway

set sync source Specify which clock source is the active clock source. The identity ofthe current synchronization source is not stored in persistentstorage.

set syncswitching

Toggle automatic sync source switching

show sync timing Display the status of the primary, secondary, and local clock sources

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Documentation Release Note Number: MER-1002-004

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TM

Figure 1Hierarchical Synchronization

Stratum 1 nodes (clock controlled directly by Cesium clock)

Stratum 2 nodes (Toll Offices)

Stratum 3 nodes (Digital Central and End Offices, and Digital PBXs)

Stratum 4 nodes (Digital PBXs and Channel Banks)

Digital Transmission Facility

Primary Reference Source

Secondary Reference Source553-7560.EPS

PrimaryReference Source