Figure 24. Resistance Budget Span Powering Two Repeaters (Example) - ADTRAN H4TUC 3192 Installation And Maintenance Practice

An example problem is illustrated in Figure 24. For
this example, begin with three known measurements:
600 ohm first segment resistance, 700 ohm second
segment resistance, and 900 ohm third segment
resistance. Refer to Figure 24 and the following steps
to solve the example problem:
1. Find the 900 ohm third segment resistance line
on the graph. This line is depicted in bold in
Figure 24. This line is the upper span power
limit.
2. Find the 600 ohm first segment resistance point
on the vertical axis.
3. Find the 700 ohm second segment resistance
point on the horizontal axis.
HDSL4 Single Pair Resistance for Span Powering Two Repeaters and an H4TU-R
1100
1000
900
800
700
600
500
400
300
300 400

Figure 24. Resistance Budget Span Powering Two Repeaters (Example)

61222404L1-5B
Resistance Budget
Third Segment Resistance
WITHIN LIMITS
500 600
Second Segment Resistance (ohms)
4. Find the instance on the graph where the points
from Steps 2 and 3 meet.
5. If this points below the bold line defined in
Step 1, the current is capable of span powering
two H4Rs and one H4TU-R.
OUTSIDE LIMITS
700 800 900 1000 1100
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