150-388-105-05, Revision 05
Appendix A - Specifications
HLU-388 List 5
March 25, 2000
55
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 depend 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 17.
HDSL Loss Over Cables
Cable Gauge (AWG/mm)
Loop Loss
(a)
(dB/kft)
(a) At 196 kHz, 68°F (20°C)
Loop Resistance (
Ω
/
kft)
26/0.4
3.88
83
24/0.51
2.84
52
22/0.61
2.18
32
19/0.91
1.54
16
A Windows-based program, Cable Calculator, may be downloaded from the Customer Site
portion of PairGain’s web site at www.pairgain.com. If you don’t have a customer password,
contact your sales representative.
Table 18.
HLU-388 Power Parameters—No Doubler
HRU Model No.
HRU CPE
Power
42.5 Vdc Power
Consumption (Watts)
Heat Dissipation (Watts)
42.5 Vdc Current (mA)
Typical
Maximum
Typical
Maximum
Typical
Maximum
HRU-412 List 1, 2, 3, 4
ON
12.0
13.2
5.1
5.6
284
312
HRU-412 List 1, 2, 3, 4
OFF
11.0
12.1
5.0
5.5
260
286
HRU-412 List 6, 7, 8
ON
12.6
13.9
5.2
5.7
297
327
HRU-412 List 6, 7, 8
OFF
9.7
10.7
4.5
4.9
228
251
HRU-402
N/A
7.7
8.5
4.5
4.9
182
200
HRU-411
(a)
(a) HLU-388 PWRF option set to HIGH.
ON
21.0
23.1
6.3
6.9
495
544
HRU-411
OFF
8.2
9.0
5.2
5.7
193
212