Application - PairGain HiGain HLU-319 Manual

Revision 01
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Easy return to factory default user settings
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Circuit ID option
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Low power consumption
A
PPLICATION
A HiGain system, consisting of a HiGain line unit and a HiGain remote unit,
provides a quick and cost-effective way of delivering T1 High Capacity
Digital Service (HCDS) to customers over copper pairs. The HiGain system
can be deployed on two unconditioned, non-loaded copper pairs without
repeaters, and without the need for bridged tap removal or binder group
separation.
The general guidelines for HiGain system usage is that each loop have less
than 35 dB of loss at 196 kHz, with 135 ohm driving and terminating
impedances.
Table 1 provides a guide for the loss over various cable gauges at 196 kHz
and 135 ohms. The table applies to the HDSL cable pairs between the HiGain
line unit and the HiGain remote unit. Without specific loop insertion loss
data, add 3 dB for each bridged tap and 1 dB for each cable gauge change.
The DC cable resistance determines the simplex powering resistance path of
the loops. The maximum allowable resistance for a HiGain system is
800 ohms over two HDSL simplex loops. This means, for example, where
3.7 km of 0.51 mm wire equals 34.08 dB (insertion loss), resistance is at 622
ohms which is well below the limit of 800 ohms.
Cable Gauge
0.4 mm
0.51 mm
0.61 mm
0.91 mm
2
December 22, 1997
Table 1. HDSL Loss over Cables
Loss at 196 kHz
(db/km)
12.7
9.3
7.2
5.1
PairGain Engineering - Plant Series
150-319-142-01
Ohms per km
272.3
170.6
105
52.5
HLU-319 List 4B