Maximum Current Drain; Loop Attenuation, Insertion Loss, And Reach - ADC H4TU-C-231-L5A User Manual

Appendix A - Specifications
M C
AXIMUM URRENT
The maximum current drain is the maximum current drawn from the shelf power supply when its at its minimum
voltage (-42.5 ). This determines the shelf fusing requirements. Use the -42.5 Vdc current data in
Vdc
page 53 to 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 29 dB loop attenuation. The 3-span system
should be locally powered to achieve this maximum reach.
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 = 1.5 times loop attenuation
54
D
RAIN
, I
NSERTION
Table 21 below. This is equivalent to no more than 31 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
October 15, 2003
L , R
OSS AND EACH
Maximum Reach (kft) Maximum Reach (kft)
Span 1
12
16
21
29
LTPH-UM-1253-01
Table 20 on
Ω
per kft
Span 2 and Span 3
11.0
15.0
20.6
27.8
H4TU-C-231 List 5A
83
52
32
16