350-431-116-01, Revision 01
Testing
HLU-431 List 1F
January 8, 1999
17
P
OSITRON
H
IGH
-
VOLTAGE
I
SOLATION
A
PPLICATIONS
Since the HLU-431 List 1F restricts its output voltage to 140V for all
applications including doublers, it can be used with Positron High Voltage
Protection (HVP) equipment. This equipment consists of High Voltage
HDSL isolation transformers and dc-to-dc converters located in external
High Voltage Interface (HVI) cabinets. The two HLU HDSL pairs are routed
into the HIV cabinet where each terminates into a two-wire HDSL
transformer card. The HDSL-simplexed line voltage is accessed at the center
taps of these two transformers and then applied to a dc-to-dc converter circuit.
The converter creates an identical, but isolated, output voltage that is
PWR FEED OFF Power Feed Off
HDSL span power has been turned off by setting
the PWRF 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 software 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 1F 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 1F is under control of the HMU
network management unit. In this state, the
RS-232 Craft port on the HLU-431 front panel is
inoperative.
(a) These messages only apply to systems with doublers present
.
Table 7.
Four-Character Front Panel Messages (Cont.)
Message
Full Name
Description
Summary of Contents for HLU-431
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