Bay Networks 8000 RAC Installing Manual page 101

Table 4-1. Model 8000 RAC Front-Panel LEDs (continued)
LED Description
Status and Alarm TEST- The network Test indicator is on when the WAN
LEDs Interface is looped back. Loopback tests are activated
either locally by the user or by the telephone company.
SYNC - The Sync indicator is on when the WAN
interface is synchronized with the received network
signal and is receiving proper framing information. The
absence of sync causes the RAC to transmit a
YELLOW alarm across the telephone network.
LOS - The LOS indicator is on when the WAN
interface is detecting no signal on the network interface
receiver. When an LOS condition exists, the WAN
interface transmits a YELLOW alarm to the remote
system.
RED - The RED alarm indicator is on during a locally
detected carrier failure such as loss of signal or loss of
frame sync. During the RED alarm condition, a
YELLOW alarm is transmitted across the telephone
network.
YELLOW - The YELLOW alarm indicator is on 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 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.
Installing the Model 8000 Remote Access Concentrator
Chapter 4 Troubleshooting Procedures
4-3