3
Section 61245001L7-5, Issue 1
61245.001L7-5A
Description
Indicates five possible states of the quality of the HDSL signals on loop 1:
Off ................. No synchronization of HTU-C and HTU-R on loop 1.
Red ............... Poor signal quality on loop 1 (> 10
-7
BER).
Yellow ........... Marginal signal quality on loop 1 (
≤
2 dB margin above 10
-7
BER).
Green ............ Good signal quality on loop 1 (> 2 dB margin above 10
-7
BER).
Blinking ......... An error detected on either end of loop 1 will cause this LED to blink briefly.
Indicates five possible states of the quality of the HDSL signals on loop 2:
Off ................. No synchronization of HTU-C and HTU-R on loop 2.
Red ............... Poor signal quality on loop 2 (> 10
-7
BER).
Yellow ........... Marginal signal quality on loop 2 (
≤
2 dB margin above 10
-7
BER).
Green ............ Good signal quality on loop 2 (> 2 dB margin above 10
-7
BER).
Blinking ......... An error detected on either end of loop 2 will cause this LED to blink briefly.
Indicates the following three conditions:
Off ................. Network-side DSX-1 signal is absent or is of a format that does not match the
provisioning of the HDSL circuit.
Blinking ......... Bipolar Violation (BPV), frame bit error (SF mode), or CRC error (ESF mode)
detected at DSX-1 signal.
On Solid ........ Network-side DSX-1 signal is present and synchronized.
Indicates the following three conditions:
Off ................. No alarm condition detected.
Red ............... Alarm condition detected either locally (HTU-C), or locally and remotely (HTU-C and
HTU-R).
Yellow ........... Remote alarm condition detected.
Indicates three possible loopback states:
Off ................. Unit is not in loopback or armed state.
Blinking ......... The loopback arming sequence has been detected. In this state the unit is armed
(ready for loopback) but not in loopback.
On Solid ........ Local (HTU-C) loopback is active.
Table C. Front Panel Indicators
Indicator
LP1
LP2
DSX
ALM
LBK
Table B. SW1 Option Settings
1
(Default settings are indicated in bold typeface.)
Function
Loopback Timeout
Enabled
Disabled
NIU Loopback
Enabled
Disabled
Manual Frame Select
SF
ESF
T1 Framing
Unframed
Framed
Manual Code Select
AMI
B8ZS
1
The HTU-C transfers the local configuration to the HTU-R when circuit synchronization is achieved. The HTU-R then sets its
configuration to match the HTU-C.
2
Loopback timeout must be selected prior to initiating a loopback.
3
20-minute timeout is the default for Loopback Timeout Enabled. 60-minute and 120-minute timeouts are also available from the craft
interface.
Description
Loopback Timeout is Enabled.
2, 3
Loopback Timeout is Disabled.
This switch programs the ADTRAN HDSL system to respond to traditional T1 network interface
unit (NIU) loop-up and loop-down codes. See Appendix A for more information on specific codes.
Selects Superframe (SF) format.
Selects Extended Superframe (ESF) format.
This switch selects the T1 framing mode.
Selects Unframed (UFRM) operation; SW1-3 is ignored.
Selects Framed operation.
Alternate Mark Inversion (AMI) is selected.
B8ZS line code is selected.
Switch
SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
HTU-C
1 2 4 5 0 0 1 L 7
TX
RX
LP1
LP2
DSX
ALM
LBK
R
S
2
3
2
B8ZS
FRM
ESF
NIU LB DIS
LBK TIMEOUT DIS
AMI
UFRM
SF
EN
EN
E
Q
DSX-1
LBO
533
399
266
133
0
EXT
