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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 in the table below can be sent by a test set.
Loopback
Inband Code
NLOC
1111000
NDU1
110000
NDU2
111000
NDU3
1010001
NDU4
1010010
NREM
1110000
SMJK
11000
CREM
1111110
CDU1
111100
CDU2
111110
CDU3
1011001
CDU4
1011010
CLOC
1111100
Loopdown
11100
For more detailed information about the Maintenance Terminal
screens, provisioning, and loopback mode testing, refer to the
HLU-388 List 5F technical practice, document number
150-388-156-xx. It can be downloaded from the Customer Site portion
of the ADC Web page at www.adc.com. A password is required to
access the Customer Site Web pages. If you do not have a password,
contact your ADC 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.
NOTE: Alarm (ALRM) displays prior to an alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO) condition.
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).
T
ESTING
Table 1. GNLB Loopback Commands
Description
DSX-1 signal is looped back to the network at the HLU.
DSX-1 signal is looped back to the network at HDU 1.
DSX-1 signal is looped back to the network at HDU 2.
DSX-1 signal is looped back to the network at HDU 3
DSX-1 signal is looped back to the network at HDU 4
DSX-1 signal is looped back to the network at the HRU.
DSX-1 signal is looped back to the network at the HRU SmartJack module.
Signal from customer is looped back to the customer at the HLU.
Signal from customer is looped back to the customer at HDU 1.
Signal from customer is looped back to the customer at HDU 2.
Signal from customer is looped back to the customer at HDU 3.
Signal from customer is looped back to the customer at HDU 4.
Signal from customer is looped back to the customer at the HRU.
Loops down any of the above loopbacks.
Table 2. Front-Panel Alarm Messages
Table 3. System Configuration Codes
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