Table 1-3. Network Status And Alarm Leds - Nortel 5399 Hardware Installation Manual

Chapter 1 Introduction
Network Status and
Alarm LEDs
Nortel Networks 5399 Access Switch Hardware Installation Guide
1-10
LED Description
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.
The Network Status and Alarm LEDs display network activity during
system operation. Table 1-3
Network Status and Alarm LEDs, one set for each WAN port.
Technical Support personnel can use this information to diagnose
problems.

Table 1-3. Network Status and Alarm LEDs

Alarm Description
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 SYNC indicator is ON (green) when the WAN interface is
properly 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 a LOS condition exists, the Remote
Access Concentrator transmits a YELLOW alarm to the
remote system.
RED The RED alarm indicator is ON (amber) during a locally
detected carrier failure. During the 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.
describes the alarms. There are two sets of