PairGain ETU-772, Quick Installation Manual, Page: 12 / 32

Overview 700-722-900-02, Revision 02
6 June 21, 1999 UTU-722 and ETU-772 List 1
UTU and ETU Front Panel LED Indications
LED Mode Description
HDSL SYNC LED Steady green
Slow flashing
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 ALM LED Steady red
Pulsing red
Off
Indicates:
•
Loss of sync word (LOSW)
•
Margin is below the set margin alarm
threshold
• 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.
I/F ALM LED Steady red Loss of Clock (LOC) alarm due to loss of
TT clock (Nx64k timing) or external clock
(EXT timing).
For information on loopback testing and loopback LED
indications, see the
HiGain-ETSI RS Rate Selectable HDSL
Line and Desktop Units technical practice, section
700-722-100-xx.
See “Documentation” on page iii for
information on how to obtain this practice.