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Digital trunk clock source

About this task

Digital trunks require the telephone system at each end of the trunk to share a clock signal to

ensure synchronization of call signalling. The B5800 Branch Gateway can obtain and use the

clock signal from any of its digital trunks. Typically the clock signal provided by a digital trunk

from the central office exchange is used as this will be the most accurate and reliable clock

source.

To do this, the Clock Quality setting on each line in the B5800 Branch Gateway configuration

is set to one of the following:

• Network

If available, the clock signal from this trunk should be used as the B5800 Branch Gateway

clock source for call synchronization. If several trunk sources are set as Network, the

B5800 Branch Gateway will default to using one as detailed below.

• Fallback

If available, the clock signal from this trunk can be used as the clock source if none of the

trunks set as Network are providing a clock source.

• Unsuitable

The clock source from this trunk will never be used as the B5800 Branch Gateway clock

source.

If no clock source is available the B5800 Branch Gateway can use its own internal clock if

necessary.

In the example below the first B5800 Branch Gateway is set to use the public network trunk

as its clock source and ignoring the possible clock source from the QSIG trunk. The other

B5800 Branch Gateway system is using the clock signal received from the first B5800 Branch

Gateway on its QSIG trunk as its clock source. Thus both systems are using the same clock

source and that clock source is the public network exchange.

When multiple trunks with the same setting are providing clock signals, trunks are used in the

order of slots 1 to 4 and then by port on each slot.

The current clock source being used by an B5800 Branch Gateway system is shown on the

Resources page within the B5800 Branch Gateway System Status Application.

Digital trunk clock source

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Avaya B5800 Bedienungsanleitung Seite 105