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System Clocking Configuration window 78
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 6 • System Clocking
Clock Reference (sysGSClockMode)
The Clock Reference parameter defines the clocking mode for the 3096RC. The clocking mode you assign to
the T-DAC defines whether or not it provides the main reference clock to the entire chassis in which the T-
DAC resides. Clocking mode options are as follows:
• Master—In master mode (also referred to as primary mode) the T-DAC obtains the main reference clock
and provides it to other equipment installed in the chassis with the T-DAC. Because there can only be one
master clock source in the chassis, if the T-DAC is the only blade in the chassis, you must define the clock-
ing mode as master, but if another blade in the chassis has already been defined as the master, do not define
the T-DAC’s clocking mode as master.
• Secondary—In secondary mode, the T-DAC provides a backup (referred to as secondary or fallback) refer-
ence clock. It will obtain the main reference clock and provide it to other equipment in the chassis only if
the device designated to provide the master clock reference fails. For reliability, we recommend having a sec-
ondary clocking blade defined for the chassis.
• Slave—In slave mode the T-DAC does not provide any clock reference. Frequently, the 3096RC will be
defined as a slave while another blade (such as the Patton Model 6511) is configured as the master.
To configure the T-DAC’s clocking mode, select one of the following values from the Clock Reference drop-
down menu:
• master(1)—The T-DAC will obtain the main reference clock and provide it to the other equipment
installed in the chassis with the T-DAC
• secondary(2)—If the device designated to provide the chassis master clock reference fails, the T-DAC—as
the secondary source clocking for the chassis —will obtain the main reference clock and provide it to the
other equipment installed in the chassis with the T-DAC.
• slave(3)—The T-DAC will not provide clocking reference for any other blade in the chassis
Note
In the event of failure of both primary and secondary clocks, all cards
in the chassis will switch to their own internal clock.