Installation & Operation Manual 520 Document # LTRT-92224
Mediant 8000
When clock source (BITS trunk) with a higher priority returns in service after the
failure, the Timing Module may either revert to the higher-priority clock source or
continue using the lower-priority clock source. The behavior is controlled via the Auto
Clock Reference Mode parameter.
38.8.2.1 Connecting Media Gateway to the External Equipment
Connect the BITS trunks from two BITS generators to corresponding entries on SA-
1/RTM. Two trunks from the BITS Generator A should be connected to the BITS 1 RJ-
48c connector on both SA-1/RTM modules. Two trunks from the BITS Generator B
should be connected to the BITS 2 RJ-48c connector on both SA-1/RTM modules. For
more information, see Section the figure above.
38.8.2.2 Configuring Media Gateway Software
To configure Timing Module BITS Sync Clock Mode configurations:
1. Click the
button to access the Media Gateway status screen.
2. In the Navigation pane, select PSTN and then in the configuration pane, click
Clock Settings; the Clock Settings screen is displayed.
3. Configure the Timing Mode parameter to TimingModuleBITSSync.
4. Configure General Timing Module Settings parameters as described in the
below table 'General Timing Module Settings Parameters' below.
Table 38-25: General Timing Module Settings Parameters
Parameter Name Type Provisioning Type Description
Source Mode Enum
Manual, Automatic
Instant Defines the operational mode of
the clock reference selection
algorithm.
Automatic – selection between
clock sources (BITS 1 and 2) is
performed automatically; when
one source fails, another source
is automatically used.
Manual – selection is performed
according to the user-defined
External Reference Clock Priority;
the source with the highest
priority is used; even when the
selected clock source fails. In this
case, Media Gateway does not
switch to another source.
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