Avaya CS 1000 - Free-Run (Non-Tracking); Reference Clock Errors; Automatic Clock Recovery

Free-run (non-tracking)
In free-run mode, the clock controller does not synchronize on any source. It provides its own
internal clock to the system.
This mode can be used when the system serves as a master clock
source for other systems in the network. Free-run mode is undesirable if the system is intended
to be a slave. It can occur, however, when both the primary and secondary clock sources are
lost due to hardware faults or when invoked by software commands.
Reference clock errors
System software checks every 15 minutes to see if a clock controller or reference clock error
has occurred.
In tracking mode, the clock controller tracks on one reference clock. If a clock controller error
is detected, or if there is a problem with the reference clocks, the system switches to free-run
mode.
A
reference clock error occurs when there is a problem with clock driver or with the reference
system clock at the far end. If the clock controller detects a reference clock error, with only one
of the reference clocks, the reference clock switches to the usable clock.
Figure 25: Clock controller primary and secondary tracking
Automatic clock recovery
Automatic switchover of the primary and secondary reference clocks is always enabled in the
system.
1.5 Mb DTI/PRI maintenance
120 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com