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Mediant 2000 SIP User’s Manual E. Mediant 2000 Clock Settings
Version 4.4 205 July 2005
Appendix E Mediant 2000 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.
a. To use the internal gateway clock source configure the following parameters:
TDMBusClockSource = 1
ClockMaster = 1 (for all gateway trunks)
b. 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)
Note 1: To configure the TDM Bus Clock Source parameters, refer to Section 5.9.4 on
page 68.
Note 2: When the Mediant 2000 is used in a ‘non-span’ configuration, the internal
gateway clock must be used (as explained above).
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