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V
ERIFICATION
Once the HLU is installed, verify that it is operating properly by monitoring the Status
LEDs on the front panel.
LED Status
Alarm (ALM) LED
Solid red Indicates an LOS condition at the HLU T1 input.
Blinking Indicates an LOS condition at the HLU T1 input.
HDSL LEDs
Solid green Indicates HDSL Loop 1 and Loop 2 are in sync.
Blinking once
per second
Blinking 4 times
per second
Blinking 10 times
per second
OFF Indicates no activity on the HDSL loop.
DS1 Framing (FRM)
LEDs (ESF and SF)
ESF LED = Solid green Indicates Extended Super Frame (ESF). The LED blinks once per second when a
SF LED = Solid green Indicates Super Frame (SF). The LED blinks once per second when a frame error
OFF Indicates unframed or no signal.
DS1 Code LEDs
(B8ZS and AMI)
B8ZS LED = Solid green Indicates that the DS1 line code option is set to B8ZS or the option is set to AUTO
AMI LED = Solid green Indicates that the user DS1 line code option is set to AMI or the option is set to
Loopback (LPBK) LED
Solid yellow Indicates Network Remote Loopback (NREM), SmartJack (SMJK), or Transmit
Blinking once
per second
Blinking 4 times per
second
L
OGGING ON TO THE
The HLU supports remote login through a maintenance terminal (ASCII terminal or a PC
running terminal emulation software) connected to the craft port on the HLU front panel.
Remote login creates menus and screens for the HLU that are identical to those viewed at
the HLU. Once logged on, you can access the Remote Terminal Main Menu screens to view
system settings, initiate loopbacks, and provision the circuit.
To log on and access the Remote Terminal Main Menu screens using a maintenance
terminal:
SPACEBAR
1
Press the
ENTER
2
Press the
Terminal Main Menu items are replications of the line unit screens. Depending on the
HiGain Line Unit (HLU) attached to the HLU, remote provisioning may be available.
Refer to the applicable HLU technical practice for details.
For more detailed information about the maintenance terminal
screens, provisioning, and loopback mode testing, download the
appropriate line unit technical practice from the the ADC website at
www.adc.com .
Status LED Descriptions
Indicates
Shows alarm states for remote and local Loss of Signal (LOS).
Displays HDSL Loop 1 and Loop 2 conditions.
Indicates the HDSL loop is trying to acquire sync.
Indicates a margin alarm condition at the HRU on the last span.
Indicates a Cyclical Redundancy Check (CRC) error on the HDSL loop.
Indications for framing patterns. If DS1 signals are not detected, the ESF, SF,
B8ZS, and AMI LEDs will not light.
frame error is indicated.
is indicated.
Indications for DS1 code options. If DS1 signals are not detected, the ESF, SF,
B8ZS, and AMI LEDs will not light.
and an AMI line code is being received at the HRU DS1 input. The LED blinks once
per second when a string of excessive zeros is detected.
AUTO and an AMI line code is being received at the HRU DS1 input. This LED
blinks once per second when a Bipolar Violation (BPV) is detected.
Shows loopback states to and from the network and to and from the Customer
Interface (CI).
Loss of Signal (TLOS).
Indicates Customer Local Loopback (CLOC) loopback state.
Indicates the HRU is in an Armed state.
several times to display the Remote Login screen.
key to view the HiGain Maintenance Terminal Screen. The Remote
M
M
AIN
ENU
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