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6 • System Clocking
Model 6511RC Switch Matrix Administrators’ Reference Guide
42
Introduction
Introduction
During operation, the T-DAC synchronizes data transmission on all DS0 channels with a clock pulse, called the
reference clock. This reference clock synchronizes all the cards in the ForeFront chassis, or all the cards in a chassis
segment in the Model 6676 ForeFront chassis. The configuration of the system clocking parameters select the
source for that clock pulse. (The T-DAC generates the synchronizing clock from this source). In the following dis-
cussion, the clock sources are called Main Reference and Fallback Reference on the web management pages.
The clocking subsystem includes a fallback auto-recovery mechanism by which the T-DAC monitors a Main
clock Reference (source) and switches to a Fallback Reference (source) if the main reference becomes unavail-
able. Once the main reference clock is re-established, the auto-recover feature switches the clocking back to the
main reference. By default, the clocking fallback mechanism is disabled at the factory prior to the T-DAC’s
shipment. To activate the T-DAC’s fallback system, you must enable it.
The following parameters control the T-DAC’s clocking subsystem: Module Clocking Mode, Module Clocking
Source, and Module Clocking Fallback.
Figure 23. System Clocking Overview window
System Clocking Overview window
The System Clocking Overview window enables you to define the system clocking parameters and view certain
clocking status information. To display the System Clocking Overview window (see
figure 23
), click the System
Clocking link on the Configuration Menu pane.
Summary of Contents for 6511RC
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