Replacing The Ntak92 Off-Premises Protection Module - Nortel 1000E Maintenance Manual

144 Replacing equipment

Replacing the NTAK92 off-premises protection module

A lightening strike can cause failure of the NTAK92 protection assembly.
The first indication of such a failure is an out-of-service telephone. To check
for and replace failed protectors, follow the steps in
for loop closure" (page 144)
Procedure 37
Testing for loop closure
Step
1
2
3
4
5
6
Procedure 38
Testing continuity
Step
1
2
3
4
5
6
Copyright © 2007, Nortel Networks
.
Action
To test for a dial tone across cable pairs on J1 and J2, use standard
loop closure test equipment (for example, butt-in). If a protector
failed, go to Step 2. If not, go to the appropriate chapter in this guide.
Remove the protection module cover plate.
Remove the faulty protector.
Install a new protector in the same position as the faulty protector.
Replace the cover plate.
Test the set for proper operation.
Action
Remove the cover plate from the protection module.
Use an ohmmeter to measure continuity across the protectors.
See Figure 19 "Wiring diagram for NTAK92 off-premises protection
module" (page 145). If a protector failed, go to Step 3. If not, go to
the appropriate chapter in this guide.
Remove the faulty protector.
Install a new protector in the same position as the faulty protector.
Replace the cover plate.
Test the set for proper operation.
Nortel Communication Server 1000
Communication Server 1000E Maintenance
NN43041-700 01.02 Standard
Release 5.0 20 June 2007
or Procedure 38 "Testing continuity" (page
—End—
—End—
Procedure 37 "Testing
144).