
Configuring Networks
3-12
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Sample Calculation (cascading limits)
Number of OLMs Path Variability Value of
Node 1 to Node 2
Total PVV
2 6 BT + 6 BT 12 BT
4 6 BT + 2 * 3 BT + 6 BT 18 BT
8 6 BT + 6 * 3 BT + 6 BT 30 BT
11 6 BT + 9 * 3 BT + 6 BT 39 BT
12 6 BT + 10 * 3 BT + 6 BT 42 BT > 40 BT !!
Number of OLMs Delay Equivalent from
Node 1 to Node 2
Remaining Cable Length
2 140 m + 2 * 360 m + 140 m 3520 m
4 140 m + 360 m + 2 * 260 m + 360 m + 140 m 3000 m
8 140 m + 360 m + 6 * 260 m + 360 m + 140 m 1960 m
11 140 m + 360 m + 9 * 260 m + 360 m + 140 m 1180 m
Notes:
S If a DTE is connected via the integrated TP port, this attachment must be
included in the length calculation as a delay equivalent of 140 m and a PVV of
0.
S Each further network component increases the PVV and reduces the remaining
cable length.
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