150-451-142-04, Revision 04
Product Overview
HDU-451 List 4B
October 8, 1998
3
The HiGain system operates with any number of other T1, POTS, Digital
Data Service (DDS) or other HiGain Systems sharing the same cable binder
group.
In order to achieve optimum performance, the electrical length (196 kHz loss)
of all doubler spans should be as close as possible to being equal. This
arrangement usually results in the highest operating loop margins.
when calculating the electrical length of each span. If it is not
possible to make all spans equal, then choose the span lengths to reduce the
total power consumption of the HLU that powers the doublers. This is done
by minimizing the length of Span 1 and maximizing the length of Span 3.
Figure 1.
HiGain Installation with Two Doublers.
Table 1.
HDSL Loss Over Cables
Cable Gauge
Loss @ 196 kHz(dB/ft)
Ohms per kft
26/0.4mm
3.880
83.3
24/0.51mm
2.841
51.9
22/0.61mm
2.177
32.4
19/0.91mm
1.535
16.1
