Nortel Meridian 1 Replacement Manual page 89

Table 4
Network loop codes
Group/
shelf
0 / 0
0 / 1
3 If the multi disk unit (MDU) or floppy disk unit (FDU) is located in the
module, unseat disks from the disk drives. (In an Option 61, move the
MDU or FDU to the active CPU module.)
4 Turn off power to the column or the module power supply:
a With AC power, set the main circuit breaker for the column to OFF
(down) in the rear of the pedestal.
Due to hazardous voltage in AC-powered systems, power to the entire
column must be shut down. This shuts down all functions in the
column.
b With DC power, set the switch on the NT6D41 CE Power Supply to
OFF (down). Set the circuit breaker for just this module to OFF
(down) in the rear of the pedestal. (All other modules in the column
retain power.)
5 Remove the NT8D22 System Monitor in the rear of the pedestal. (Do not
turn off the blower unit in the front of the pedestal.)
Note: If this is the master system monitor, disconnect the RJ11 cables
before you pull the system monitor out of the pedestal.
If the system monitor is not removed, the system may shut down.
Replacing equipment
Peripheral
signaling card
0
1
WARNING
CAUTION
Page 89 of 362
Loops
disabled/enabled
0 —
16 —
Hardware replacement
15
31