CHAPTER23 Digital PSTN
Mediant 1000 Gateway & E-SBC | User's Manual
a. From the 'TDM Bus Clock Source' drop-down list (TDMBusClockSource), select Network
to recover the clock from the line interface.
b. In the 'TDM Bus Local Reference' field (TDMBusLocalReference), enter the trunk from
which the clock is derived.
● The E1/T1 trunk should recover the clock from the remote side (see below
description of the 'Clock Master' parameter).
● The BRI trunk should be configured as an ISDN user-side.
c. Enable automatic switchover to the next available "slave" trunk if the device detects that
the local-reference trunk is no longer capable of supplying the clock to the system:
i. From the 'TDM Bus PSTN Auto FallBack Clock' drop-down list
(TDMBusPSTNAutoClockEnable), select Enable.
ii. From the 'TDM Bus PSTN Auto Clock Reverting' drop-down list
(TDMBusPSTNAutoClockRevertingEnable), select Enable to enable the device to
switch back to a previous trunk that returns to service if it has higher switchover
priority.
iii. In the Trunk Settings page (see Configuring Trunk Settings), configure the priority
level of the trunk for taking over as a local-reference trunk, using the 'Auto Clock
Trunk Priority' parameter (AutoClockTrunkPriority). A value of 100 means that it never
uses the trunk as local reference.
2. (E1/T1 Trunks Only) Configure the PSTN trunk to recover/derive clock from/to the remote side
of the PSTN trunk (i.e. clock slave or clock master): In the Trunk Settings page, configure the
'Clock Master' parameter (ClockMaster) to one of the following:
● Recovered - to recover clock (i.e. slave)
● Generated - to transmit clock (i.e. master)
Configuring Internal Clock as Clock Source
You can configure the device to use its internal clock source. The internal clock source is a stratum
4E- compliant clock source. When the device has no line interfaces, the device should be
configured in this mode.
➢ To configure internal clock as clock source:
1. Set the clock source to be from the device's internal oscillator. In the TDM Bus Settings page,
set the 'TDM Bus Clock Source' parameter (TDMBusClockSource) to Internal.
2. (E1/T1 Trunks Only) Set the line to drive the clock on all trunks: In the Trunk Settings page, set
the 'Clock Master' parameter (ClockMaster) to Generated (for all trunks).
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