Section 150-441-124
June 12, 1997
Revision 01
Page 4
PairGain Engineering - Plant Series
HiGain HLU-D41
Dimensions
Height................................................................ 4.5-inch (11.4 cm)
Width ................................................................ 1.4-inch (3.6 cm)
Depth................................................................. 10.1-inch (25.7 cm)
Weight............................................................... 0.7 lb. (.32 kg)
Margin Indicator
Displays HDSL span Signal-to-Noise Ratio (SNR) margin relative to 10
-7
Bit Error Ratio (BER) operation
3. Applications
3.1
This HiGain system provides a cost-effective, easy-to-deploy method for delivering FT1 service over
a single metallic pair. Conventional in-line T1 repeaters are not required. Cable pair conditioning,
pair separation and bridged tap removal are not required.
3.2
General guidelines require that the loop has less than 35 dB of loss at 196 kHz, with 135 ohms
driving and terminating impedances. Table 3 provides a guide for the loss of various cable gauges at
196 kHz and 135 ohms. The table applies to the HDSL cable pairs between the HLU, HRU and
HDU modules. Without specific insertion loss measurement data, add 3 dB for each bridged tap and
1 dB for each cable gauge change.
Table 3. HDSL Loss Over Cables
Cable Gauge
Loss at 196 kHz
(dB/kft)
Ohms per kft
26/0.4 mm
3.88
83
24/0.51 mm
2.84
52
22/0.61 mm
2.18
32
19/0.91 mm
1.54
16
3.3
HiGain systems:
Operate with any number of other T1, Plain Old Telephone Service (POTS), DDS or other
HiGain systems sharing the same cable binder group.
Can be used with customers requiring FT1 service on a temporary or permanent basis.
Provide a means of quickly deploying service in advance of fiber-optic transmission systems.
Are easily installed allowing service to be provided within hours. Fiber optic systems can be
installed at a leisurely pace and cut-over from the installed HiGain system when convenient to
do so. The installed HiGain system can then be easily removed and utilized elsewhere.
