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LTPH-UM-1138-02, Issue 2
The -48 Vdc power consumption is the maximum total power that the H4TU-C consumes or draws from the shelf
power source. This parameter is needed when the H4TU-C is in a location remote to the CO it is serving. It
determines the battery capacity required to maintain an 8-hour, standby battery reserve for emergency situations.
Battery capacity, therefore, limits the maximum number of line units which can be installed in a remote enclosure.
Use the data in
Table 20 on page 60
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 60
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 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-231 List 1
to perform this analysis.
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 20 on
Ω
per kft
Span 2 and Span 3
11.0
15.0
20.6
27.8
83
52
32
16
61
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