Appendix A: Additional Technical Information
150-402-102-01, Revision 01
48
July 27, 1998
HRU-402 List 2
F
UNCTIONAL
D
ESCRIPTION
This section describes the functions of the HRU-402 List 2.
Operational Capabilities
HiGain utilizes PairGain’s 2B1Q HDSL transceiver system to establish two
full-duplex 784 kbps data channels between the HLU and a remotely mounted
HRU-402 List 2. This system provides a total capacity of 1.568 Mbps
between the two units. PairGain’s HDSL technology also provides
full-duplex services at standard T1 rates over copper wires between an HLU
and an HRU-402 List 2, which comprise one HiGain system. A block
diagram of the HRU-402 List 2 is shown in
.
The HRU-402 List 2 power supply converts the 90 to 200 Vdc power that is
received on the simplex pairs (or the -48V input when locally powered) to
voltages and currents required by the remote unit circuitry. The remote unit
typically dissipates 2.5W of power.
The HRU-402 List 2 can be used with the HLU-232 line unit to form an
automatic 1 by 1 protection switch system. Refer to the HiGain Line Unit
Model HLU-232 practice (section #: 150-232-100-xx) for more details. For
this application, the HRU-402 List 2 must be installed in the two slot
HRE-422 remote enclosure. This enclosure provides access to the
HRU-402 List 2 protection switch output, on pin 12, which controls the
protection switching function.
