Troubleshooting Guide 18 Document #: LTRT-57601
MediaPack, Mediant 1000, Mediant 2000
For all Trunks, set the ini file parameter ClockMaster to 1 (or the corresponding Web
interface parameter 'Clock Master ' to "Recovered"). This parameter determines the Tx
clock source of the E1/T1 lines.
Figure 3-2: Clock Synchronization from Device
¾ To use the recovered clock option:
1. Set the ini file parameter TDMBusClockSource to 4 (or the corresponding Web
interface parameter 'TDM Bus Clock Source' to "Network").
2. For all ‘slave’ trunks connected to the PSTN, set the ini file parameter ClockMaster_x
to 0 (or the corresponding Web interface parameter 'Clock Master' to "Recovered").
3. For all ‘master’ trunks connected to the PBX, set the ini file parameter ClockMaster_x
to 1 (or the corresponding Web interface parameter 'Clock Master' to "Generated").
Figure 3-3: Clock Synchronization from PSTN
The example above assumes that the device recovers its internal clock from one of the
‘slave’ trunks connected to the PSTN and provides a clock source to the PBX on its ‘master’
trunks. In addition, you must define from which of the ‘slave’ Trunks the device recovers its
clock. The following two options are available:
To recover the clock from a specific E1/T1 line, use the ini file parameter
TDMBusLocalReference (range: 1-8 on the Web interface, 0-7 on ini file)
Set the ini file parameter TDMBusPSTNAutoClockEnable to 1 to recover the clock
from any connected synchronized slave E1/T1 line. If this Trunk loses its
synchronization, the device attempts to recover the clock from the next Trunk. Note
that initially, the device attempts to recover the clock from the Trunk defined by the ini
file parameter TDMBusLocalReference.
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