Bay Networks 5393 Hardware Installation Manual page 106

Chapter 4 Troubleshooting Procedures
4-4 Remote Annex 5393/PRI Hardware Installation Guide
Table 4-1. Remote Annex 5393/PRI Front Panel LEDs (continued)
LED(s) Description
Network/Status TEST - The red network TEST indicator is ON when
Alarms the ISDN Network 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 when the
PRI interface is synchronized with the received
network signal and is receiving proper framing
information.
LOS - The red LOS indicator is ON when the PRI
interface is detecting no signal (pulses) on the
network interface receiver. When an LOS condition
exists, the PRI interface transmits unframed all ones
(AIS) to the network.
RED - The RED alarm indicator is ON 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
when receiving a YELLOW alarm condition from the
telephone network.
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.