Nortel Meridian 1 Option 11C, Administration And Maintenance

Page: 385 / 507

Chapter 8 — Service changes and maintenance Page 371 of 492
Option 11C ISDN BRI Administration and Maintenance
Replacing ISDN BRI cards
The following procedures describe how to remove and replace defective
cards, verify the operation of ISDN BRI equipment, and package and ship the
defective cards to an authorized repair center.
Removing and replacing the MISP
The MISP can be removed and inserted without turning off the power. This
allows the system to continue processing calls not associated with the
defective MISP.
Note: A clock controller is required for ISDN PRI, DTI or BRI trunk
applications. If the MISP being removed is providing the clock function,
the clock must be reassigned to another location. Refer to the chapter
ISDN BRI trunk implementation for more information.
To remove a MISP:
1 Log-in on the maintenance terminal or telephone and load overlay
program 32 (LD 32). Check the status of the MISP by entering STAT
c, where c is the card slot number of the MISP.
Note: Make sure the MISP is idle before proceeding with the next step
to avoid interrupting active calls.
2 When the MISP is idle, type DISC c and press the Enter key to
disable the MISP, where c is the card slot number of the MISP.
3 Remove the MISP.
Remove the clock controller if there is one.
Place it in an antistatic bag away from the work area.
4 Insert and secure the replacement MISP in its card slot.
Install the clock controller if one is required.
The MISP automatically starts a self-test.
Observe the Dis LED on the front of the MISP. It is lit during the test. If
it flashes three times and stays lit, it has passed the test. If it does not flash
three times and then stays lit, it has failed the test.