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Caution:
Always replace the IDLE clock cable first, whether it is the primary or secondary
cable position. After the replacement of the first (IDLE) cable position, ensure the
system reports the clock status properly with an ACTIVE and IDLE clock output. If
the output reports the correct status the ACTIVE cable can be disconnected for
replacement. Disconnecting the ACTIVE cable will transition the previously IDLE
clock to the ACTIVE clock forcing the system to use the new clock cable that was
installed.
Note:
In this procedure, the high‑speed clock status indicated in the output of the rept-
stat-clk command reflects the presence of at least one ATM LIM card or E1/T1
MIM in the system. The status fields remain empty until the card is configured to
use the high‑speed clock.
Procedure — Replace or Add HS source Timing Clock Cables with backplane (P/
N 850‑0330‑06/07)
Before starting the cable replacement, physically locate the:
1.
•
primary and secondary composite clock and high‑speed clock connections at the
backplane of the customer composite clock source (customer will provide positions).
•
existing composite clock cables (P/N 830‑0226‑xx) that are routed from the primary
and secondary composite clock connections of the customer clock source to the
Primary BITS and Secondary BITS clock connectors J49 and J48 on the control
shelf.
Figure 6-31
backplane.
shows the location of these connectors on the control shelf
Chapter 6
Source Timing
6-61
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