Configuring Internal Clock As Clock Source - AudioCodes Mediant 500L User Manual


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:
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 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.

22.2.1.2 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.
User's Manual
Figure 22-2: Configuring TDM Bus
From the 'TDM Bus PSTN Auto FallBack Clock' drop-down list
(TDMBusPSTNAutoClockEnable), select Enable.
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.
In the Trunk Settings page (see ''Configuring Trunk Settings'' on page 491),
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 500L Gateway & E-SBC
494 Document #: LTRT-10532