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4-3

Chapter 4 Troubleshooting Procedures

Nortel Networks 5399 Access Switch Hardware Installation Guide

Table 4-1. Model 5399 Front Panel LEDs (continued)

(continued on next page)

LED(s) Description

Module Status

LEDs (continued)

Load - Turns green when the Remote Access

Concentrator is loading the operational image or

dumping a RAM image if there is a failure. The LED

turns amber if a load error is detected.

Network Status

LEDs

TEST - The network TEST indicator is ON (amber)

when the WAN Interface is looped back. Loopback

tests are activated either locally by the user or by the

telephone company.

SYNC - The green SYNC indicator is ON (green)

when the WAN interface is synchronized with the

received network signal and is receiving proper framing

information.

LOS - The LOS indicator is ON (amber) when the

WAN interface is detecting invalid synchronization

pulses on the network interface receiver. When an LOS

condition exists, the WAN interface transmits a

YELLOW alarm to the remote system.

Alarm LEDs RED - The RED alarm indicator is ON (amber) during

a locally detected carrier failure.Duringthe RED alarm

condition, a YELLOW alarm is transmitted across the

telephone network.

YELLOW - The YELLOW alarm indicator is ON

(amber) when receiving a YELLOW alarm condition

from the telephone network. This indicates a failure

detected at the other end of the link (the Central

Office).

BLUE - The BLUE alarm indicator is ON (amber)

when receiving an unframed, all-ones Alarm Indication

Signal (AIS) from the network. This condition exists

upon a loss of originating signal, or when any action is

taken that would cause a signal disruption.

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Bay Networks Remote Annex Guide d'installation Page 95