Siemens SIMATIC NET Betriebsanleitung Seite 36

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Seitenansicht 35
Configuring Networks
3-10
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Table 3-3 Variability Values in Bit Times (BT) for Interface Card Pairs
ECFL2 ECFL4 ECTP3 ECAUI KYDE-S UYDE
ECFL2 4 BT 4 BT 5 BT 4 BT 4 BT 7 BT
ECFL4 - 3 BT 5 BT 3 BT 3 BT 6 BT
ECTP3 - - 5 BT 5 BT 5 BT 6 BT
ECAUI - - - 2 BT 2 BT 4 BT
UYDE - - - 3 BT
OLM
OLM
Node 1
Node 2
1
1
1. ITP standard cable 9/15
100 m
100 m
2000 m
2. Fiber-Optic Cable (FO)
2
Figure 3-1 Example of a Simple Configuration
Example of a calculation:
The simple example of a point-to-point link between two DTEs via two OLMs
illustrates how to check the network configuration.
Table 3-4 Sample Calculation for Figure 3-1
Node 1 --> Node 2
Cable Length Delay Equivalent Variability Value
Node 1 140 m 0 BT
Node 1 - OLM 1 100 m
OLM 1 (ITP/FO) 360 m 6 BT
OLM 1 - OLM 2 2000 m
OLM 2 (FO/ITP) 360 m 6 BT
OLM 2 - node 2 100 m
Node 2 140 m 0 BT
Sum of cable length 2200 m
Sum of delay equivalents 1000 m
Totals 3200 m 12 BT
The sum of the cable lengths plus the sum of the delay equivalents add up to
3200 m. The PVV is 12 bit times. This means that the configuration can be
implemented.
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