Nortel Networks NTRN10AN, 3500 manual 88Hardware feature descriptions

3-88Hardware feature descriptions

DS3x3 mappers are installed in pairs and DS3 protection switching is 1+1 non-revertive.

The DS3x3 circuit pack can be installed in slots 3 through 10. DS3x3 circuit packs are installed in pairs. The first DS3x3 circuit pack of the pair is installed in an odd slot. The second DS3x3 circuit pack of the pair is installed in the adjacent even slot. The second DS3x3 circuit pack functions as the protection DS3x3 circuit pack for the working circuit pack in the odd slot.

The maximum number of working DS3x3 circuit packs that can be inserted in a shelf is four.

See Table 3-3 on page 3-6for operational temperature ranges.

Note 1: If there is a 1-28 DS1 I/O module installed, and if slots 5 and 6 are not equipped with DS1 mappers, you may not install DS3x3 circuit packs in slots 5 or 6 (there is not enough room for slot 5 or slot 6’s BNC I/O modules).

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 DS3x3 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 DS3x3 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

DS3x3 protection switching is 1+1 non-revertive. If a working DS3x3 mapper becomes defective, the traffic is switched to the protection DS3x3 mapper. Switching can also take place under user control.

Alarm LED definitions

The following table provides a list of LEDs of the DS3x3 mapper. See Figure 3-28 on page 3-47for the DS3x3 mapper faceplate layout showing the location of the LEDs.

LED	Color	Description
Status (top)	Red	Circuit pack failure
Status (bottom)	Green	DS3x3 equipment is active and at least one DS3 line
		facility is in service with at least one cross-connect
LOS (1-3)	Yellow	Loss of signal on the port

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004