Overview
150-431-115-01, Revision 01
6
September 22, 1998
HLU-431 List 1E
Front Panel Display
The front panel display is used with the MODE and SEL buttons to display system diagnostic messages. Refer to
for a listing of the four character messages.
The front panel display turns on when power is initially applied to the HLU-431. To conserve power, the display
only remains on for 4 minutes. The use of the MODE or SEL buttons activates the front panel display and restarts
the 4-minute, power-control timer.
Table 4.
Front Panel Display Messages
Message
Full Name
Description
CREM
Customer Remote Loopback
Signal from customer is looped back to customer at HLU-431.
NLOC
Network Local Loopback
DSX-1 signal is looped back to DSX-1 at HLU.
CLOC
Customer Local Loopback
Signal from customer is looped back to customer at HRU-412.
NREM
Network Remote Loopback
DSX-1 signal is looped back to DSX-1 at HRU.
SMJK
Remote Smart-Jack Loopback
DSX-1 signal is looped back to DSX-1 at HRU.
TLOS
Transmit Loss Of Signal
HRU is in a logic loopback state, caused by a loss of its DS1 input from the CI, when
ENAbled at the HRU via its TLOS switch option.
FERR
Framing Bit Error occurred
Framing bit error occurred at HLU DSX-1 input.
LBPV
Local Bipolar Violation
A bipolar violation has been received at the DSX-1 input to the HLU-431.
SIG1
Signal 1
The HLU and HRU transceivers are trying to establish contact with each other on
loop 1.
SIG2
Signal 2
The HLU and HRU transceivers are trying to establish contact with each other on
loop 2.
ACQ1
Acquisition 1
The HLU and HRU multiplexers are trying to establish synchronization over loop 1.
ACQ2
Acquisition 2
The HLU and HRU multiplexers are trying to establish synchronization over loop 2.
H1ES
HDSL CRC Error Channel 1
HLU HDSL loop 1 CRC error.
H2ES
HDSL CRC Error Channel 2
HLU HDSL loop 2 CRC error.
ARM
HiGain System is Armed
Armed and ready to respond to Intelligent Repeater loop codes.
ACO
Alarm CutOff
A minor alarm occurred and was retired to an ACO condition, after pressing the SEL
button on the HLU front panel.
SELF-TEST
Self-test
The HLU is in a self-test mode. This occurs every power On/Off cycle.
ALRM
Alarm condition exists
A minor alarm condition is in effect.
1=xx
HDSL Loop 1 Margin
Indicates the power of the received HDSL signal on loop 1 relative to noise. Any value
of “06” or greater is adequate for reliable system operation.
2=yy
HDSL Loop 2 Margin
Indicates the power of the received HDSL signal on loop 2 relative to noise. Any value
of “06” or greater is adequate for reliable system operation.
PWR FEED
SHRT
Power Feed Short
Indicates a short between the two HDSL pairs. This same message can occur with
an HRU which is drawing the correct amount of power over good cable pairs, but can
not communicate with the HLU.
PWR FEED
OPEN
Power Feed Open
Indicates an open circuit in the T and R of either HDSL pair.