INM 9370-RD Rev 5
17
Key to symbols in the digram:
Note: Only spur LEDs shown for clarity.
= Active, healthy (solid)
= Standby, failed (pulse)
= Standby, healthy (pulse)
Step 1
1. Spur #3 on Barrier A has failed and shows pulsing red.
Control of this spur has transferred automatically to
Spur 3 of Barrier B, which has changed from a
flashing green to a solid green. Barrier A needs to be
replaced to restore redundant service.
Step 2
2. Press the A > B fail-over button, beside Barrier
A, to pass spur control to Barrier B. Barrier B LEDs
should all change to solid green and all LEDs on
Barrier A should pulse to indicate that Barrier A is
now in ‘standby’ mode and Barrier B has become the
‘active’ barrier.
3. Barrier A can now be removed from the carrier
(following the procedure in Section 5.2.1.1) and
replaced with a known good module. After replacement, Barrier A remains in
‘standby’.
4. To restore Barrier A to ‘active’ mode, press the B > A fail-over button located
beside Barrier B. Control of all spurs now returns to Barrier A while Barrier B returns
to ‘standby’ mode.
* NOTE
Operating the fail-over buttons will not allow active spurs to be transferred to a
missing, failed spur or failed barrier module.
5.3 Terminator and Trunk Surge Protection modules
Figure 5.3 - Module connectors and retaining clips
