Figure 3. Resistance Budget Span Powering Two Repeaters - ADTRAN 239 H4R Installation And Maintenance Manual

Once the resistance of each segment is confirmed,
refer to Figure 3 to decide if the H4TU-C is capable
of span powering two H4Rs and one H4TU-R.
Follow these steps to utilize the graph shown in Figure
3:
1. Find the line on the graph which represents the
known third segment resistance. These are the
lines running diagonally across the graph labeled
300 - 1100 ohms. This line represents the upper
limit for 2 H4Rs plus H4TU-R span powering.
2. Find the first segment resistance on the vertical
axis.
3. Find the second segment resistance on the
horizontal axis.
HDSL4 Single Pair Resistance for Span Powering Two Repeaters and an H4TU-R
1200
1100
1000
900
800
700
600
500
400
400

Figure 3. Resistance Budget Span Powering Two Repeaters

8
Resistance Budget
WITHIN LIMITS
500 600
Second Segment Resistance (ohms)
Section 61221445L1-5, Issue 1
4. Find the instance where the two points from steps
2 and 3 meet on the graph.
5. The point found in step 4 must be below the
upper limit line defined by the third segment
measurement (step 1). If the instance where these
two points is above this line, the H4TU-C cannot
span power two H4Rs and the H4TU-R.
Note that these measurements represent only one of
the two HDSL4 pairs.
Third Segment Resistance
OUTSIDE LIMITS
700 800 900 1000
61221445L1-5A
1100