Testing
350-431-116-01, Revision 01
12
January 8, 1999
HLU-431 List 1F
T
ESTING
The HLU-
431
List
1F
four-character front panel display has many useful
system diagnostic messages. These messages are listed in Table 4 through
Table 7. This display turns on when power is initially applied to the HLU-
431
List
1F
. To conserve power, the display only remains on for 5 minutes if
neither the MODE or SEL buttons are pressed. The use of either button
activates the four-character display and restarts the 5-minute power-control
timer.
D
OUBLER
A
PPLICATIONS
The low voltage limit (140V) of the HLU-431 HDSL power supply limits its
doubler applications to just one doubler. It can power one doubler and one
remote unit if the doublers are one of the following: HDU-404, HDU-407 or
HDU-409. The remote must be an HRU-402. If any other HiGain doublers or
remote units are used, then the remote unit must be locally powered.
Summary of Contents for HLU-431
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