Figure 23. Resistance Budget Span Powering Two Repeaters - ADTRAN H4TUC 3192 Installation And Maintenance Practice

Once the resistance of each segment is confirmed,
refer to Figure 23 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 23:
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 two 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
1100
1000
900
800
700
600
500
400
300
300 400

Figure 23. Resistance Budget Span Powering Two Repeaters

18
Resistance Budget
Third Segment Resistance
WITHIN LIMITS
500 600
Second Segment Resistance (ohms)
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.
OUTSIDE LIMITS
700 800 900 1000 1100
61222404L1-5B