61223424L2-5A Issue 1, December 2003 3
Front Panel LED Indicators
There are seven front panel mounted status LED
indicators. Each indicator is described in Table 4.
Table 4. Front Panel LED Indicators
Front Panel Name Indication Description
DSL 1
Green
DSL Loop 1 sync, no errors currently detected, and signal margin ≥3dB
Red No DSL Loop 1 sync, errors being detected, or signal margin <3dB
DSL 2
Green
DSL Loop 2 sync, no errors currently detected, and signal margin ≥3dB
Red No DSL Loop 2 sync, errors being detected, or signal margin <3dB
DS1
Green DS1 signal is present and no errors currently being detected
Red No DS1 signal or signal is present with errors
ALM
OFF No active alarm present
Red Loss of DS1 signal to the unit
Yellow Loss of DSX-1 signal to the H4TU-C
ESF/SF
OFF Unit is provisioned for UNFRAMED data
Yellow Unit is provisioned for ESF data
Green Unit is provisioned for SF data
B8ZS/AMI
Yellow Unit is provisioned for B8ZS coded data
Green Unit is provisioned for AMI data
LLB/RLB
OFF Unit is NOT in loopback
Yellow Unit is in loopback (network and/or customer)
Green H4TU-C is in loopback toward this unit
TX
R
REM
LOC
LBK
1223424L2
LOCAL
DSL 1
DSL 2
DS1
ALM
(GRN)
SF
(YEL)
ESF/
(GRN)
AMI
(YEL)
B8ZS
/
(GRN)
RLB
(YEL)
LLB
/
RX
M
O
N
TX
R
S
2
3
2
