Alarm Leds - Interphase RAS Communications Controller 5536 User Manual

Alarm LEDs

The following alarm LEDs indicate connection problems that
result from line failures:
LED Meaning
Loss of Signal. Typically appears when no electrical signal is
LOS
detected. (Check if the line is plugged in on the board and on the
network interface).
Loss of Frame (also known as Red Alarm). Appears when many
LOF
frames are lost because of framing errors. The terminal is unable
to synchronize on the DS1 signal.
Alarm Indication Signal (also known as Blue Alarm).
AIS
Transmitted instead of the normal signal to maintain
transmission continuity. Also indicates to the receiving
equipment that a transmission interruption occurred either at the
equipment originating the AIS signal, or upstream of the
originating equipment.
Remote Alarm Indication (also known as Yellow Alarm).
RAI
Transmitted in the outgoing direction when a terminal
determines that it has lost the incoming signal.
5536 PRI RAS Communications Controller Users Guide
Appendix E: Line Status Utility
173