AudioCodes Mediant 500 MSBR, User Manual

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User's Manual 464 Document #: LTRT-10375
Mediant 500 MSBR
25.2.1.1 Recovering Clock from PSTN Line Interface
This section provides a brief description for configuring synchronization based on
recovering clock from the PSTN line interface. For a full description of the clock
parameters, see PSTN Parameters on page 1134.

To configure synchronization based on clock from PSTN line:
1. Open the TDM Bus Settings page ( Setup menu > Signaling & Media tab > Media
folder > TDM Bus Settings ), and then do the following:
Figure 25-2: Configuring TDM Bus
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.
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. From the 'TDM Bus PSTN Auto FallBack Clock' drop-down list
(TDMBusPSTNAutoClockEnable), select
Enable .
b. 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.
c. In the Trunk Settings page (see Configuring Trunk Settings on page 461),
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.
d.
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)