Protection Switching; Section Data Communication Channel (Sdcc) - Nortel NTRN10AN Planning Manual

Note 2: If there is a 29-56 DS1 I/O module installed, and if slots 7 and 8
are not equipped with DS1 mappers, you may not install EC-1x12 circuit
packs in slots 7 and 8 (there is not enough room for slot 7 or slot 8's BNC
I/O modules).
Note 3: If there is a 29-84 DS1 I/O module installed, and if slots 7 through
10 are not equipped with DS1 mappers, you may not install EC-1x12
circuit packs in slots 7 through 10 (there is not enough room for slot 7
through slot 10's BNC I/O modules).

Protection switching

EC-1x12 protection switching is 1+1 non-revertive. If a working EC-1x12
circuit pack becomes defective, the traffic is switched to the protection
EC-1x12 circuit pack. Switching can also take place under user control.

Section data communication channel (SDCC)

EC-1x12 circuit packs do not support SDCC channels.
Alarm LED definitions
The following table provides a list of the EC-1x12 circuit pack LEDs. See
Figure 3-28 on page 3-47
showing the location of the LEDs.
LED
Status
Active
LOS (1-12)
Planning and Ordering Guide—Part 1 of 2 NTRN10AN
for the EC-1x12 circuit pack faceplate layout
Color Description
Red Circuit pack failure
Green Circuit pack equipment is active and at least one
EC-1 line facility is in service with at least one
cross-connect
Yellow Loss of signal on the port
Hardware feature descriptions 3-85
Rel 12.1 Standard Iss 1 Apr 2004