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Revision 01 Section 350- 431 - 114 -01
HLU- 431 List 1D Page 15
1=xx or 2=yy HDSL Loop Margins Indicates the power of the received HDSL signal
on each Loop 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 2 HDSL pairs in
span 1. This same message can occur with an
HRU that is drawing the correct amount of
power over good cable pairs but cannot
communicate with the HLU.
PWR FEED
OPEN Power Feed Open Indicates an open circuit in the T&R of either
HDSL pair in span 1.
PWR FEED
OFF Power Feed Off HDSL span power has been turned off by setting
the PSFD option to DIS.
BAD RT? No response from HRU The HLU does not receive any response from the
HRU. Thus, the HRU’s integrity is questionable.
VER HLU Software
Version # Displays during the System Settings review
mode. Depress the
MODE button for 3 seconds
to view the saoftware version.
LIST 0xL HLU’s List # Displayed during System Settings review mode
defined above.
FRM Frame: SF, ESF, UNFR,
NONE Defines the type of frame pattern being received
from the DSX-1. Displayed during System
Settings mode defined above.
CODE Line Code: AMI, B8ZS
This is the line code that HLU- 431 List D is
receiving at its DSX-1 interface. Displayed
during System Setting review mode.
DS0 DS0 Blocked Channels Indicates status of DS0 blocked channels.
NONE indicates no channels are blocked. BLK
indicates some channels are blocked.
MNGD Managed The HLU-431 List 2D is under control of the
HMU network management unit. In this state,
the RS-232 maintenance port on the
HLU-431’s front panel is inoperative.
Four-Character Front Panel Messages (Cont.)
Message Full Name Description
†
These messages only apply to systems with doublers present.