Nortel Networks 5399 Manual Do Utilizador
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)
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.
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
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.
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.
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.
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. During the RED alarm
condition, a YELLOW alarm is transmitted across the
telephone network.
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).
(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.
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.