ADTRAN HDSL2 - Manual (Page 26)

H2TU-C Front Panel Operation HDSL2 for General Distribution Installation and Maintenance Practice
16 61223HDSL2L2-5B
H2TU-C FRONT PANEL OPERATION
LED indicators mounted on the front panel of the unit provide status of the HDSL2 circuit.
Each indicator is described in
Table 9 for the H2TU-C and Table 10 for the H2TU-R.
Table 9. H2TU-C Front Panel LED Indications
Front
Panel
Label Status Description
DSL Green
Red
DSL sync, no errors currently detected, and signal margin ≥ 2 dB
No DSL sync, errors being detected, or signal quality < 2 dB
DSX/DS1
Green
Red
DSX-1 signal is present and synchronized and no errors are
detected
No DSX-1 signal, or signal is present with errors
ALM
Off
Red
Yellow
No alarm condition detected
Loss of DSX-1 signal to the unit
Loss of DS1 signal to the remote
ESF/SF
Off
Green
Yellow
Unit is provisioned for unframed data
Unit is provisioned for SF data
Unit is provisioned for ESF data
B8ZS/AMI
Green
Yellow
Unit is provisioned for AMI line code
Unit is provisioned for B8ZS line code
LBK
Off
Yellow
Unit is not in loopback
Unit loopback is active toward network or customer
Table 10. H2TU-R Front Panel LED Indications
Front
Panel
Label Status Description
DSL Green
Red
DSL sync, no errors currently detected, and signal margin > 2 dB
No DSL sync, errors being detected, or signal margin ≤ 2 dB
DS1 Green
Red
DS1 signal is present and no errors currently being detected
No DS1 signal or framing mismatch
ALM
Off
Red
Yellow
No active alarm present
Loss of DS1 signal to the unit
Loss of DSX signal to the H2TU-C
ESF/SF
Off
Green
Yellow
Unit is provisioned for UNFRAMED data
Unit is provisioned for SF data
Unit is provisioned for ESF data
B8ZS/AMI Green
Yellow
Unit is provisioned for AMI line code
Unit is provisioned for B8ZS line code
LLB/RLB
Off
Green
Yellow
Unit is NOT in loopback
Active remote loopback from the H2TU-C toward the customer
This unit is in loopback (network and/or customer)
1181113L2
DSL
DSX/DS1
ALM
B8ZS/AMI
(YEL) (GRN)
ESF/ SF
(YEL) (GRN)
LBK
TX
RX
E
Q
LOC
L
B
K
1223024L2
DSL
LOCAL
DS1
ALM
(GRN)
SF
(YEL)
ESF/
(GRN)
AMI
(YEL)
B8ZS/
(GRN)
RLB
(YEL)
LLB/
UR H T