150-512-100-03, Revision 03
Functional Description
HRU-512 List 1
September 25, 1998
3
F
UNCTIONAL
D
ESCRIPTION
This section describes the functions of the HRU-512 List 1.
O
PERATIONAL
C
APABILITIES
HiGain utilizes PairGain’s 2B1Q HDSL transceiver system to establish a
full-duplex 784 kbps data channels between the HLU and a remotely mounted
HRU-512 List 1. See
for the HRU-512 List 1 block diagram.
When the HRU-512 List 1 is line powered, it converts the metallic 130 Vdc
line voltage to the 5 V and -5 V power required by the HRU-512 List 1
circuitry. When the HRU-512 List 1 is locally powered from -48 V, an
additional 30 V power supply is created. This provides a 60 mA simplex
current source to power an external NID (Network Interface Device) if the 60
mA I-CPE current option is enabled.
The HRU-512 List 1 dissipates 5 Watts of power and may consume up to
6.5 Watts when feeding 60 mA of simplex current to the CI.
Use caution when the HRU-512 List 1 is used to power external
CSUs. Some CSUs require more output voltage than the 30
Volts provided by the HRU. Also, the HRU can not power both
a NID and a CSU at the same time.
The 60 mA option should never be turned on if the
HRU-512 List 1 is line powered. This could overload the
system’s power capabilities and adversely affect its
performance.
