Figure 24. Resistance Budget Span Powering Two Repeaters (Example) - ADTRAN 220 HDSL4 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. See 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.
HDSL4 Single Pair Resistance for Span Powering Two Repeaters and an H4TU-R
1100
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Figure 24. Resistance Budget Span Powering Two Repeaters (Example)

18
Resistance Budget
Third Segment Resistance
WITHIN LIMITS
500 600
Second Segment Resistance (ohms)
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.
4. Find the instance on the graph where the points
from Steps 2 and 3 meet.
5. If this point is below the bold line defined in
Step 1 the circuit is capable of span powering two
H4Rs and one H4TU-R.
OUTSIDE LIMITS
700 800 900 1000 1100
61222401L1-5C