User's Manual 436 Document #: LTRT-89730
Mediant 3000
higher-priority clock source or continue using the lower-priority clock source. When both
BITS reference clock sources fail, the device enters into clock holdover.
To configure BITS reference clock source redundancy:
In the System Timing page, set the 'TDM Bus Enable Fallback' parameter
(TDMBusEnableFallback) to one of the following:
• Auto Non-Revertive - enables non-revertive clock fallback between BITS
interfaces.
• Auto Revertive - enables auto-revertive clock fallback between BITS interfaces.
Notes:
• BITS synchronization is applicable only when the device's hardware supports
BITS capability.
• For a full description of the BITS parameters, see ''PSTN Parameters'' on page
962.
22.2.4.3 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 System Timing
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. If the device has BITS capability, then in the System Timing page, set the 'Timing
Module Mode' parameter (TMMode) to StandAlone (default).
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