Table 9. Single Pair Dc Resistance Value - ADTRAN 3192 H4TU-C Installation And Maintenance Practice

7. Resistance Values. See
Each of the three segments associated with span
powering two H4Rs and a H4TU-R must satisfy
the DC resistance budgets in addition to the
recommended loop attenuation requirements. 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.
Single H4R spans do not require any restriction
due to DC resistance.
AWG
19
22
24
26
Note: Interpolated between 70°F and 120°F data. Extrapolated from 70°F and 120°F data.
20
Table 9.

Table 9. Single Pair DC Resistance Value

Resistance (ohms/kft)
70°F
16.465
33.006
52.498
83.475
Issue 1, December 2003
A circuit that otherwise meets attenuation and
other requirements for cable reach will
encounter span powering problems if resis-
tance values are excessive.
The segment resistance (Ω
this equation:
Ω * Ω
= L
segment 26 26
where L is the length of # AWG cable (kft., excluding
#
bridged taps) and Ω
90°F 120°F
17.183 18.261
34.446 36.606
54.789 58.225
87.117 92.581
NOTE
) is determined using
segment
* Ω * Ω
+ L + L + L
24 24 22 22
is the DC resistance of #AWG cable.
26
140°F
18.979
38.046
60.516
96.223
61223404L2-5A
* Ω
19 19