Table 6. Range Limits: 26 Gauge / 70°F / Pic; Table 7. Range Limits: 24 Gauge / 70°F / Pic; Table 8. Single Pair Dc Resistance Value - ADTRAN 3192 HDSL4 Installation And Maintenance Practice

3192 H4TU-R, Span Powered Installation and Maintenance Practice
26 Gauge
1
2
3
24 Gauge
1
2
3
7. Resistance Values. See
Each of the three segments associated with span powering two H4Rs and the 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.
A circuit that otherwise meets attenuation requirements for cable reach will
encounter span powering problems if resistance values are excessive.
The segment resistance (Ω
Ω * Ω
= L + L
segment 26 26
where L is the length of # AWG cable (kft., excluding bridged taps) and
#
AWG
19
22
24
26
Note: Interpolated between 70°F and 120°F data. Extrapolated from 70°F and 120°F data.
61223426L12-5A
Table 6. Range Limits: 26 Gauge / 70°F / PIC
st
segment
nd
segment
rd
segment
Table 7. Range Limits: 24 Gauge / 70°F / PIC
st
segment
nd
segment
rd
segment
Table 8.
) is determined using this equation:
segment
* Ω * Ω
+ L + L
24 24 22 22

Table 8. Single Pair DC Resistance Value

Resistance (ohms/kft)
70°F
16.465
33.006
52.498
83.475
NOTE
* Ω
19 19
90°F
17.183
34.446
54.789
87.117
HDSL4 Deployment Guidelines
Recommended Maximum
10,470 ft.
9,865 ft.
9,865 ft. (see note)
Recommended Maximum
14,770 ft.
14,050 ft.
14,050 ft. (see note)
Ω
is the DC resistance of #AWG cable.
26
120°F
18.261
36.606
58.225
92.581
140°F
18.979
38.046
60.516
96.223
27