150-231-175-01, Revision 01
Overview
HLU-231 List 7E
September 23, 1998
3
Applications with HiGain Doublers
For Doubler applications, one or two Doublers may be used in the HDSL loops between the HLU-231 List 7E and
the HRU:
The HLU-231 can line power one doubler and the remote unit for a total of two spans.
If the remote unit is locally powered, the HLU-231 can power up to two doublers for a total of three spans.
The HLU-231, List 7E has been enhanced over the older HiGain line units so that it can line power two doublers
and the remote unit (three spans). This feature is only available when using the HDU-439, 437 List 1 “mini”
doublers and the HRU-412 List 8 remote unit in HDU-231, List 7E circuits.
For additional information on the “mini” doublers refer to technical practice #150-439-100-01. This section
addresses HLU-231 List 7E operation with the HDU-451 List 1, 2, 3, & 4 or the HDU-439, 437 “mini” doublers.
The List 1 and 2 doublers have identical power consumptions. The List 3 and 4 units are low power doublers which
consumes 40% less power than either List 1 or 2. The Power Consumption section addresses both the high and
low power doubler versions.
P
RODUCT
D
ESCRIPTION
The HLU-231 includes:
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A front panel featuring:
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A status display
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System option buttons
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Status LED
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DSX-1 access jacks
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RS-232 Craft port
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CLEI/ECI bar code number
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Configuration number
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Card-edge connector
