Qpc477 Bus Terminating Unit - Nortel Meridian 1 Hardware Replacement Manual

Page 228 of 250

QPC477 Bus Terminating Unit

553-3001-520 Standard 17.00 January 2002
Replacing equipment
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.
DANGER
Module covers are not hinged; do not let go of the
cover. Lift the cover away from the module and set it
out of your work area.
1 Turn off power to the module:
— With AC power, set the circuit breaker on the Module Power
Distribution Unit (MPDU) to OFF (down).
— With DC power, set the switch on the power supply to OFF
(down).
"aaa" is PCK for track primary clock, SCLK for
track secondary clock, or FRUN for free run mode
exit LD 60