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L
OOPBACK
Initiate loopback testing from the HiGain maintenance menus or use the MODE and SEL
buttons. The hexidecimal inband codes shown below can be sent by a test set.
Inband Code
11000. . .
ARMING or NI LPBK (2-in-5 arming code)
11100. . .
IR LPDN or DISARM (3-5 disamarming code)
D3D3
IOR LPBK (NLOC and CREM 230-232 bit errors and 229-231 bit errors)
C741
ILR-1 LPBK (NDU1 and CDU1 10 bit errors)
C754
LR-20 LPBK (NDU2 and CDU2 200 bit errors)
C743
ILR-3 LPBK (NDU3 and CDU3 30 bit errors)
C744
ILR-4 LPBK (NDU4 and CDU4 40 bit errors)
C742
ILR-2 LPBK (NREM and CLOC 20 bit errors)
For more detailed information about the maintenance terminal
screens, provisioning, and loopback mode testing, refer to the
HLU-319 List 5D technical practice, document number 150-319-154-xx.
Copies of this publication or the technical practice can be downloaded
from the ADC website at www.adc.com . To order a hard copy, please
contact your sales representative.
Message
Description
ALRM
A system alarm condition is in effect.
ACO
A system alarm has been retired to an alarm cutoff condition by pressing the SEL button.
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 DSX-1 input to the HRU.
MAL1 or MAL2
The margin on HDSL Loop 1 or Loop 2 has dropped below the threshold (1 to 15 dB)
setting.
BER
A system Bit Error Rate alarm is in effect.
NONE
No alarm present.
T
ESTING
A5LB Special Loopback Commands
Front Panel Alarm Messages
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