Nortel Networks 3500 Extended network processor NPx NTN424BA, BH, Alarms and Tbos, Reset button

Hardware feature descriptions 3-57

Alarms and TBOS

Office alarms, TBOS, and environmental I/O are under the control of the SPx.

The SPx monitors all circuit packs in the system for problems. When a problem arises in any area, the SPx registers the problem in its alarms database so that the alarm can be retrieved by a user in a TL1 session.

Reset button

When the reset button is pressed, the SPx software and hardware initialize. During the initialization process, all the LEDs on the SPx turn on, SDCC communications with the shelf are unavailable, and RS-232 communications with the shelf are unavailable. The SPx reset button should only be used when the SPx is not responding.

Section data communication channel (SDCC)

The SPx controls the section data communications channels (SDCC). All remote TL1 sessions use SDCC as the communications link between network elements.

Equipping rules

The SPx must be installed in slot 15. See Table 3-3 on page 3-6for operational temperature ranges.

It is possible for a shelf to carry traffic and maintain equipment and path protection switching without an SPx. If the SPx fails or is removed, all communications and performance monitoring with the shelf are inactive.

Alarm LED definitions

The following table provides a list of LEDs of the SPx.

LED	Color	Description
Status	Red	Circuit pack failure
	Yellow	Loss of one or more SDCC connections or
		TIA/EIA-232 connection
Active	Green	In service

Extended network processor (NPx) (NTN424BA, BH)

The extended network processor (NPx) provides network level control. The NPx supports TCP/IP, X.25, and a seven-layer OSI stack. The NPx communicates with Preside Site Manager and the Multiservice Managed Object Agent (MOA) over TCP/IP. It supports TL1 communication over X.25 with other operations support systems (OSS).

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