This document explains how CK-192 is used to synchronize the transmit
signal on some cards.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware
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Technical Tips Conventions for more information on document
Clock Errors, these are errors in a clock distributed by the Broadband
Controller Card (BCC).
The CK-192 is used to synchronize the transmit signal on some cards. If
this is not present, it is possible that the transmit signal is off frequency,
and generates various line or trunk side errors. It is possible for other board
functions to also be affected.
If only one card indicates the failure, try another card that does not
indicate the failure in that same slot. If this new card does not show a
failure, then the original card is defective and must be replaced. If the new
card also shows the failure, then the cause of this failure is the backplane or
Issue the switchcc command in order to make
the currently-active BCC the standby. Then, replace this BCC with another unit
known to be good. Issue the switchcc command again
to make that BCC active and check again for the errors. If the errors are gone,
return the BCC which was replaced through the return materials authorization
(RMA) procedure. If both the I/O card and BCC seem to function properly, it is
possible that the backplane is defective and requires replacement. Since this
is an extreme measure, you want to repeat these testing steps to double-check.