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L
OOPBACK
Initiate loopback testing from the HiGain maintenance menus or use the MODE and SEL
buttons. The inband codes shown below can be sent by a test set.
D3D3
NLOC
CREM
NDU1
HLU
Network
Loopback
ARM
DISARM
NLOC and CREM
NDU1 and CDU1
NDU2 and CDU2
NDU3 and CDU3
NDU4 and CDU4
NREM and CLOC
For more detailed information about the Maintenance Terminal
screens, provisioning, and loopback mode testing, refer to the
HLU-388 List 5D technical practice, document number
150-388-154-xx. It can be downloaded from the Customer Site portion
of the ADC Web page at www.adc.com. To order a hard copy, please
contact your sales representative.
Message
Description
LOSW
Indicates that one of the HDSL loops has lost sync.
LLOS
Indicates that no signal is detected at the DSX-1 input to the HLU.
RLOS
Indicates that no signal is detected at the DS1 input to the HRU.
BER
A system Bit Error Rate alarm is in effect.
MAL1 or MAL2
The margin on HDSL Loop 1 or Loop 2 has dropped below the threshold set by the user.
NONE
No alarm present.
(a) Alarm (ALRM) displays prior to an alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Code
Description
VER xxxx
The release revision of the firmware (appears during the System Settings review mode).
LIST xxxx
The model number of the product (appears during the System Settings review mode).
FRM xxxx
Indicates the type of frame pattern being received from the DSX-1, where xxxx is SF,
ESF, UNFR, or NONE).
CODE xxxx
The line code setting, where xxxx is Alternate Mark Inversion (AMI) or Bipolar with
8-Zero Substitution (B8ZS).
PLEV xxxx
Indicates the HDSL line voltage in its LOW (-140 Vdc), HIGH (±112 Vdc), or DIS
(disabled) state.
(a) To view system configuration codes, press the MODE button for 3 or more seconds.
T
ESTING
A5LB Addressable Repeater Loopback Commands
C741
C754
CDU1
NDU2
HDU1
HDU2
Table 1. A5LB Special Loopback Commands
Inband Code
11000. . .
11100. . .
D3D3
C741
C754
C743
C744
C742
Table 2. Front-Panel Alarm Messages
Table 3. System Configuration Codes
C743
CDU2
NDU3
CDU3
HDU3
Description
NI LPBK (2-in-5 arming code)
IR LPDN (3-5 disarming code)
IOR LPBK (231 ± 2)
ILR-1 LPBK (10 bit errors)
LR-20 LPBK (200 bit errors)
ILR-3 LPBK (30 bit errors)
ILR-4 LPBK (40 bit errors)
ILR-2 LPBK (20 bit errors)
C744
NREM
NDU4
CDU4
SMJK
TLOS
HDU4
(a)
(a)
C742
CLOC
HRU
Customer
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