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3
Remove the system monitor from the rear of the pedestal on Core 0.
Power down Core/Net 1
For AC-powered systems: set the MPDU circuit breaker located at the left end
of the module to OFF (down position).
For DC-powered systems: set the breaker for the Core 1 module in the back
of the column pedestal to OFF (down position).
Procedure 14
Removing Core 1 cables and card cage
1
Label and disconnect the Clock Controller 1.
a.
Disconnect the NT8D76AC cable from the Clock Controller 1
faceplate card.
b.
If primary and secondary clock reference cables are connected to the
Clock Controller 1 faceplate, disconnect them last.
2
Label and disconnect all cables from the front of the module.
3
Tape over the contacts to avoid grounding.
4
Tie all cables to the sides so the working area in front of the card cage is
totally clear.
Performing the upgrade
End of Procedure
CAUTION — Service Interruption
Service Interruption
Call processing is interrupted for approximately 60
minutes while the procedures are completed.
DANGER OF ELECTRIC SHOCK
In a DC-powered system, power to the column can
remain on during the following procedures. In an
AC-powered system, however, power to the entire
column must be shut down throughout the procedures.
61C to CS 1000M SG CP PIV Upgrade
Page 67 of 212
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