Nortel Networks 3500, NTRN10AN manual EC-1x12 circuit packs do not support Sdcc channels

Hardware feature descriptions 3-85

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 3-47for the EC-1x12 circuit pack faceplate layout showing the location of the LEDs.

LED	Color	Description
Status	Red	Circuit pack failure
Active	Green	Circuit pack equipment is active and at least one
		EC-1 line facility is in service with at least one
		cross-connect
LOS (1-12)	Yellow	Loss of signal on the port

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004