Table of Contents
Advertisement
Overview
Table 4
defines the system states indicated by the front panel LEDs. When power is applied to the unit, one of the
LEDs listed in
Table 4
LED
Mode
HDSL SYNC LED
Steady green
Slow blinking
Off
HDSL ALM LED
Steady red
Pulsing red
Off
I/F ALM LED
Steady red
(a)
LPBK LEDs
LOC
Steady yellow
Off
Blinking yellow
Off
Blinking yellow
(a) The LOC and REM LPBK LEDs are read in unison.
6
will always be on.
Table 4. Line and Desktop Unit Front Panel LED Indications
REM
Off
Off
Off
Steady yellow
Blinking yellow A loopback away from the local equipment is active.
August 9, 2002
Description
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.
Loss of sync word (LOSW); or the margin is below the set margin
alarm threshold; or Errored Seconds (ES) count is above
threshold on any span.
Pulses for every ES on any span.
Normal transmit or receive data is in progress.
Loss of Signal (LOS) alarm due to loss of G.703 signal or Loss of
o
Clock (LOC) alarm due t
loss of external clock (when using EXT
timing).
Local HDSL analog loopback is active.
No loopbacks are active.
Local interface loopback is active.
Remote loopback is active.
700-701-100-02
UTU-701 and ETU-751 List 1
Advertisement
Table of Contents
