150-231-185-05, Revision 05
Appendix A - Specifications
HLU-231 List 8E
September 13, 1999
53
HDSL I
NSERTION
L
OSS
G
UIDELINES
Each loop has no more than 35 dB of loss at 196 kHz, with driving and terminating impedances of 135
Ω
.
provides a “loss” guide for the various cable gauges at 196 kHz and 135
Ω
. The table applies to the
HDSL cable pairs between the HLU, HRU, and HDU modules. In the absence of specific insertion loss
measurement data, add 3 dB for each bridged tap and 1 dB for each cable gauge change.
P
OWER
C
ONSUMPTION
Power consumption and heat dissipation depends upon the type of remote and doubler units in the system and the
CPE power setting.
Power Consumption without Doublers
The three most important power parameters of an HLU are its maximum power consumption, its maximum power
dissipation and its maximum current drain.
describes line-powered circuits on 9 kft, 26 AWG loops without a doubler.
Table 16.
HDSL Loss Over Cables
Cable Gauge
Loop Loss
(a)
(dB per kft)
(a) At 196 kHz, 68°F (20°C)
Loop Resistance (
Ω
per kft)
26 AWG / 0.4 mm
3.88
83
24 AWG /0.51 mm
2.84
52
22 AWG /0.61 mm
2.18
32
19 AWG /0.91 mm
1.54
16
A Windows-based program, Cable Calculator, may be downloaded from the Customer site
portion of the PairGain web site at
www.pairgain.com. If you don’t have a customer password,
contact your sales representative.
