Gateway Clock Settings - 3Com V7122 User Manual

C 10: A
HAPTER
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ONFIGURATION

Gateway Clock Settings

The gateway can either generate its own timing signals, using an internal clock, or recover
them from one of the E1/T1 trunks.
To use the internal gateway clock source configure the following parameters:
TDMBusClockSource = 1
ClockMaster = 1 (for all gateway trunks)
To use the recovered clock option, configure the following parameters:
TDMBusClockSource = 4
ClockMaster_x = 0 (for all 'slave' gateway trunks connected to PBX#1)
ClockMaster_x = 1 (for all 'master' gateway trunks connected to PBX#2)
Assuming that the gateway recovers its internal clock from one of the 'slave' trunks
connected to PBX#1, and provides clock to PBX#2 on its 'master' trunks.
In addition it is necessary to define from which of the 'slave' trunks the gateway recovers its
clock:
TDMBusPSTNAutoClockEnable = 1 (the gateway automatically selects one of the
connected 'slave' trunks)
Or
TDMBusLocalReference = # (Trunk index: 0 to 7, default = 0)
•
To configure the TDM Bus Clock Source parameters, see Configuring SS7
Tunneling.
•
When the gateway is used in a 'non-span' configuration, the internal gateway
clock must be used (as explained above).
V7122 Gateway User Guide
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