DS1 CONV-BD
Issue 1 May 2002
8-691555-233-143
Replacing a DS1 CONV Circuit Pack with the
Same Type DS1 CONV Circuit Pack
—Duplicated
PNC
!
WARNING:
On a system with duplicated PNC, synchronization may be provided over a
combination of active and standby components. This condition is indicated
by an OFF-BOARD WARNING alarm against TDM-CLK with Error
Type #2305. Repairs to standby PNC in this state may disrupt service.
Otherwise, if the active PNC is functional, replacement of a standby
component will not disrupt service.
!
WARNING:
Do not power down a Switch Node carrier to replace a circuit pack.
!
WARNING:
Replacing a Switch Node Interface, Switch Node Clock, Expansion Interface
or DS1 Converter circuit pack on an unduplicated system disrupts service.
The service effect can range from outage of a single PN to outage of the
entire system.
!
WARNING:
A DS1 Converter complex must consist of two TN574 boards or two TN1654
boards. A TN574 cannot be combined with a TN1654 in the same DS1
CONV complex.
Steps Comments
Enter status pnc. Verify that the component to be replaced is on
the standby PNC.
Enter busyout pnc.
Enter busyout board UUCSS. UUCSS represents the cabinet-carrier-slot
address of the circuit pack to be replaced.
Replace the circuit pack with the same DS1
CONV board type.
Enter release board UUCSS. CAUTION: Do not busyout any Expansion
Interface circuit pack after this point.
Enter test alarms long clear for category
exp-intf.
Wait 5 minutes for SNI-BD, SNI-PEER,
FIBER-LK, and DS1C-BD alarms to clear, or enter
clear firmware counters <a-pnc or b-pnc>.
Use the letter designation of the pnc that holds
the replaced component (the standby pnc).
Enter status pnc. If either PNC’s state of health is not
“functional”, consult the PNC-DUP section of
the Maintenance Manual.
Enter release pnc.
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