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4. Configuration Options
4-32
September 2002 9128-A2-GB20-80
Secondary Clock Source
Possible Settings: Net1, DSX, Internal, DBM
Default Setting: Internal
Provides a secondary clock source when the primary clock source fails. The source
selected for this configuration option provides all of the timing within the unit and the
clocks for all of the external interfaces.
The clock source will switch back to primary when the primary clock source returns and is
stable for 10 seconds. If the secondary clock source fails, the clock source will switch to
internal. The clock source will switch back to primary when the primary clock source
returns and is stable for 10 seconds.
NOTE: For the Primary and Secondary Clock Source options, only Internal can be
selected for both options. All other selections must have different settings (e.g., if
Primary Clock Source is set to Net1, Secondary Clock Source cannot be set to Net1).
Net1 – The secondary clock is derived from the Network1 T1 interface.
DSX – The secondary clock for the unit is derived from the DSX-1 interface. This setting
only appears if the DSX-1 interface is enabled.
Internal – The secondary clock is the internal clock.
DBM – The secondary clock is derived from the DBM. This selection only appears if the
DBM is installed and enabled.
Table 4-5. General System Options (2 of 3)