Nortel Meridian Meridian 1 Upgrade Manual page 114

Page 114 of 284
Power down Core/Net 0
NN43021-469 Standard 01.01 May 2007
Performing the upgrade
CAUTION
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.
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 0 module in the back
of the column pedestal to OFF (down position).
Procedure 32
Removing Core 0 cables and card cage
1 Label and disconnect all cables to the front of the module.
2 Tape over the contacts to avoid grounding.
3 Tie all cables to the sides so the working area in front of the card cage is
totally clear.
4 Remove the I/O safety panel by turning the screws on each side. Set the
I/O safety panel aside.
5 Tag and disconnect all cables from the backplane to the interior of the
I/O assembly.
6 Tag and disconnect all plugs, wires, and cables to the backplane.
Note 1: Leave the network cards in the card cage. You will relocate them
to the CP PII card cage later in the upgrade procedure.
Note 2: Two people are needed to remove the Core card cage because
of the weight of the card cage with the cards left installed.