700-814-112-01, Revision 01
Front Panel
UTU-814 List 1B
November 24, 1999
5
For information on loopback testing and loopback LED
indications, see the Line and Network Termination Units
technical practice, section 700-804-100-xx.
Table 2.
Front Panel LED Indications
LED
Mode
Description
HDSL Loop 1 SYNC
HDSL Loop 2 SYNC
Steady green
Slow blinking
Off
HDSL Loop is ready to transmit and
receive data across all spans.
HDSL Loop acquisition is in progress
for local span.
HDSL Loop is not configured.
HDSL Loop 1 ALM
HDSL Loop 2 ALM
Steady red
Pulsing red
Off
Loss of sync word (LOSW); margin below
threshold (MAR); or errored second count
(ES) above threshold.
Pulses for every ES on any span.
Normal transmit or receive data is in
progress.
I/F ALM
Blinking red
Steady red
Loss of clock (LOC); receive alarm
indication signal (RAIS); or loss of frame
alignment (LFA).
Loss of clock (LOC) or DSX-1 signal.
PROT SW
Not supported.
