Table 8. Single Pair Cable Dc Resistance Value (Ω) - ADTRAN H4TUC 3192 Installation And Maintenance Practice
Hdsl4 transceiver unit for the central office
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Resistance Values
Each of the three segments associated with span
powering two H4Rs and a H4TU-R must satisfy the
recommended insertion loss, loop attenuation
requirements in addition to the DC resistance budgets.
In general, 22 and 19 AWG segments will be
restricted by their loop attenuation while the DC
resistance will restrict the segment reach for 26 and 24
AWG. When designing a dual H4R loop, the first
segment should have lower DC resistance than the
second segment.
A
W
G
9 1
2 2
4 2
6 2
*
I
t n
r e
o p
t a l
d e
e b
w t
e
n e
0 7
F º
* *
E
t x
a r
o p
t a l
d e
f
o r
m
0 7
F º
61222404L1-5B
Table 8. Single Pair Cable DC Resistance Value (
R
e
s
s i
0 7
F º
6 1
4 .
5 6
3 3
0 .
6 0
2 5
4 .
8 9
3 8
4 .
5 7
a
d n
1
0 2
F º
a d
a t
a
d n
1
0 2
F º
a d
a t
The segment resistance (Ω
this equation:
Ω
* Ω
= L
segment
26
where : L
is the length of # AWG cable (kft,
#
excluding bridge taps), Ω
Resistance of # AWG cable
Table 8 lists single pair cable DC resistance values to
be used in the equation above.
a t
n
c
e
(
O
h
m
s
k /
) t f
0 9
F º
* º
7 1
1 .
3 8
4 3
4 .
6 4
4 5
7 .
9 8
7 8
1 .
7 1
) is determined using
segment
* Ω
* Ω
+ L
+ L
26
24
24
22
22
is the D.C.
#
Ω
)
1
0 2
F º
1
0 4
8 1
2 .
1 6
8 1
6 3
6 .
6 0
8 3
8 5
2 .
5 2
0 6
2 9
5 .
1 8
6 9
* Ω
+ L
19
19
F º
* *
9 .
9 7
0 .
6 4
5 .
6 1
2 .
3 2
17
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