Nortel Networks 3500, NTRN10AN manual DS1 I/O module types

Hardware feature descriptions 3-87

Table 3-11

DS1 I/O module types

DS1	OPTera Metro 3500 Shelf		OPTera Metro 3500 Universal Shelf Assembly (NTN476AH)
ports	Assembly (NTN476AA, DA)
	Front access only		Front access		Rear access
	I/O name	I/O PEC	I/O name	I/O PEC	I/O name	I/O PEC
1-28	DS1 1-28 Front	NTN452AA	DS1 1-28 Front	NTN452AH	DS1 1-28 Rear	NTN452BA
	I/O module		Enhanced I/O		I/O module
			module
29-56	DS1 29-56 Front	NTN452CA	DS1 29-56 Front	NTN452CH	DS1 29-56 Rear	NTN452DA
	I/O module		Enhanced I/O		I/O module
			module
29-84	DS1 29-84 Front	NTN452EA	DS1 29-84 Front	NTN452EH	DS1 29-84 Rear	NTN452FA
	I/O module		Enhanced I/O		I/O module
			module

You can provision a maximum of 84 protected DS1 facilities for each shelf.

Alarm LED definitions

The following table provides a list of the DS1 mapper LEDs. See Figure 3-28 on page 3-47for the DS1 mapper faceplate layout showing the location of the LEDs.

LED	Color	Description
Status	Red	Circuit pack failure
Active	Green	DS1 equipment is active and at least one DS1 line
		facility is in service with at least one cross-connect

DS3x3 mapper (NTN437AA)

The DS3x3 mapper has three DS3 ports and provides add/drop capability for three DS3 signals. Each port functions independently and in the same way as a DS3 mapper.

Note: Neither the DS3x3 mapper nor DS3 services are VT managed.

Equipping rules

Connectivity for the three DS3 signals at each slot is through the BNC 12-Port Front I/O module (NTN452JA) on the OPTera Metro 3500 Shelf (NTN476DA). On the OPTera Metro 3500 Universal Shelf (NTN476AH) you must use the BNC 12-Port Front Enhanced I/O module (NTN452JH) or the BNC 12-Port Rear I/O module (NTN452KA).

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