Tests and Diagnostics
GARD 8000 SYS RFL Electronics
February 14, 2011 11-33 973.334.3100
Timing Mode Setting:
Indicates the programmed setting for communications interface timing. The Status can be:
Primary Internal
Primary Recovered
Slave
Fallback Internal
Fallback Recovered
Fallback Communications bus1 clock
Fallback Communications bus2 clock
One communications interface in the GARD 8000 must be chosen as the primary clock source.
The remaining interfaces must be configured as slaves will synchronize their transmit clocks to
the primary source.
The primary clock source can either generate its own transmit clock source or generate one
based on a clock received from an external communications device or multiplexer.
If the status is Primary-Internal the communications interface clock will be generated by
GARD 8000 chassis.
If the status is Primary – Recovered the GARD 8000 communications interface clock will be
generated based on a received clock from an external multiplexer.
If the status is Slave the interface will receive its communications interface clock from the
primary interface within the chassis.
If the primary clock source has failed, the GARD 8000 has 4 fallback modes:
Internal – The transmit clock is generated by the interface module.
Recovered – The transmit clock will be based on the recovered received clock being
generated by the remote device.
Communications Bus 1- The transmit clock will be based on the GARD 8000’s
internal communications bus 1. This would provide all interface modules within a
GARD 8000 chassis with a synchronous clock source relative to the chassis
communications bus 1.
Communications Bus 2- The transmit clock will be based on the GARD 8000’s
internal communications bus 2. This would provide all interface modules within a
GARD 8000 chassis with a synchronous clock source relative to the chassis
communications bus 2.
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