Maximum Current Drain; Loop Attenuation, Insertion Loss, And Reach; Hdsl4 Reach Chart - ADC H4TU-C-319 List 1 Line Unit User Manual

LTPH-UM-1031-03, Issue 3
M C
AXIMUM URRENT
The maximum current drain is the maximum current drawn from the shelf power supply when it is at its minimum
voltage (-42.5 ). This determines the shelf fusing requirements. Use the -42.5 Vdc current data in
Vdc
determine the shelf fusing requirements for your particular H4TU-C applications.
L A
OOP TTENUATION
For Span 1, each loop has no more than 47 dB of insertion loss at 196 kHz, with driving and terminating
impedances of 135Ω, as shown in
For Span 2 and Span 3, each loop has no more than 43 dB of insertion loss at 196 kHz, with driving and
terminating impedances of 135Ω. This is equivalent to no more than 31 dB loop attenuation.
Insertion Loss
Cable Gauge
196 kHz (dB/kft)
26/0.4 mm
24/0.51 mm
22/0.61 mm
19/0.91 mm
(a) Insertion Loss = 1.38 times loop attenuation
H4TU-C-319 List 1
D
RAIN
, I
NSERTION
Table 21 below. This is equivalent to no more than 34 dB loop attenuation.
Table 21. HDSL4 Reach Chart
(a)
at Loop Attenuation
(dB/kft)
3.88 2.8
2.84 2.0
2.18 1.6
1.54 1.1
September 12, 2003
L , R
OSS AND EACH
Maximum Reach (kft) Maximum Reach (kft)
Span 1
12
16
21
29
Appendix A - Specifications
Table 21
Ω
per kft
Span 2 and Span 3
11.0
15.0
20.6
27.8
to
83
52
32
16
61