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150-412-181-01 March 31, 1998 Revision 01
HRU-412 List 8A PairGain Engineering - Plant Series 13
If local power is lost to an HRU-412 List 8A, the last span loses sync. When
the HLU or HDU attempts to reestablish sync, it detects that the HRU-412
List 8A is not locally powered and applies line power to it. The HRU-412
List 8A then powers up and operates normally if the HRU-412 List 8A is
within range to support line powering.
The -48 Vdc local power supply must have a 105 mA output current capacity
(5 W) to power each HRU-412 List 8A when the I-CPE option is set to 0 mA.
The -48 Vdc local power supply must have a 145 mA output current capacity
(7 W) to power each HRU-412 List 8A when the I-CPE option is set to
60 mA.
A Teltrend WPS-2005 Wall-Mount Power Supply, or equivalent, is capable
of powering two HRU-412 List 8A units with the I-CPE option switch set to
0 mA or one HRU-412 List 8A with the I-CPE option switch set to 60 mA.
The HRU-412 List 8A can be used in limited (2000 ohms) and unlimited (full
CSA) three span line powering applications. The line units and doublers
compatible with limited and unlimited line powering are shown below:
1 Limited: loop resistance < 2000 ohms
• Line units: HLU-231 List 7D and 7B; HLU-431 List 1D; HLU-231
List 8, 8D, and 8E; HLU 319 List 5, 5D, and 5E; HLU-388 List 5
and 5D
• Doublers: HDU-437 List 1 and 1B; HDU-439 List 1 and 1B
• Doublers: HDU-409; HDU-407; HDU-406
2 Unlimited: full CSA range on all spans
• Line units: HLU-231 List 8, 8D and 8E; HLU 319 List 5, 5D, and
5E; HLU-388 List 5 and 5D
• Doublers: HDU-409; HDU-407; HDU-406
For more information on doublers, see the technical practices for the HiGain
Mini Doublers and the HiGain Micro Doubler.
The HRU-412 List 8A supports up to three spans (with the use of
two doublers).