Qpc477 Bus Terminating Unit - Nortel Meridian 1 Replacement Manual

QPC477 Bus Terminating Unit

— In a single-CPU system, complete the replacement procedure by
exiting LD 60:
****
— In a dual-CPU system proceed with the following steps.
7 Switch CPUs:
LD 135 (for Options 51C, 61C, 81, and 81C)
SCPU
****
8 Activate the newly installed card and verify that it is active:
LD 60
SWCK
SSCK x
9 If applicable, issue a tracking command:
TRCK aaa
Note: Set the clock source to the status it was in before the replacement
procedure.
10 Verify clock switch-over and tracking:
SWCK
SSCK x
****
11 Tag defective equipment with a description of the problem and package
it for return to a repair center.
Use this procedure to replace a bus terminating unit (BTU).
Note: Check the codes on all replacement BTUs.
— QPC477-A10 and QPC477-B10 BTUs are interchangeable in
NT8D35 Network Modules.
Replacing equipment
"aaa" is PCK for track primary clock, SCLK for
track secondary clock, or FRUN for free run mode
exit LD 60
Page 269 of 362
Hardware replacement