Configuring Internal Clock As Clock Source - AudioCodes Mediant 1000B User Manual


To configure synchronization based on clock from PSTN line:
1. In the TDM Bus Settings page, do the following:
a. Set the 'TDM Bus Clock Source' parameter (TDMBusClockSource) to Network to
recover the clock from the line interface.
b. Select the trunk from which the clock is derived, using the 'TDM Bus Local
Reference' parameter (TDMBusLocalReference).
Note: 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:
a.
b.
c.
2. For E1/T1 trunks only: Set 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,
set the 'Clock Master' parameter (ClockMaster) to one of the following:
•
Recovered - to recover clock (i.e. slave)
•
Generated - to transmit clock (i.e. master)

21.2.2.2 Configuring Internal Clock as Clock Source

This section describes how to 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. For 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).
3.
User's Manual
Set the 'TDM Bus PSTN Auto FallBack Clock' parameter
(TDMBusPSTNAutoClockEnable) to Enable.
Enable the device to switch back to a previous trunk that returns to service if
it has higher switchover priority, using the 'TDM Bus PSTN Auto Clock
Reverting' parameter (TDMBusPSTNAutoClockRevertingEnable).
In the Trunk Settings page, 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.
Mediant 1000B Gateway and E- SBC
432 Document #: LTRT-27044