
Passive Components for Electrical Networks
4-4
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Maximum Cable Lengths
Table 4-1 Structured Cabling Complying with EN 50173
Uses SIMATIC NET Cable Maximum Length
Drop cable TP cord A+C max. 10 m
Tertiary cable FC TP Standard Cable
FC TP Trailing Cable
FC TP Marine Cable
Bmax.90m
Bmax.75m
Bmax.75m
Note
Industrial Twisted Pair cables (TP Standard Cable) are intended for use inside
buildings.
Twisted-pair cables (TP Cord) are intended for use in areas where EMI levels are
low such as in an office or a wiring closet.
4.2 Industrial Twisted Pair Standard Cable
Structure of the Standard Cable
The standard cable is designed as a 100 Ω S/STP cable (screened/shielded
twisted pair) with two pairs of wires. The basic element consists of two twisted
wires along with two blind elements, known as a twisted pair.
The wires are solid copper covered by an insulation layer of cellular polyethylene
which is further covered by a non-cellular foam skin. The color coding of the
conductors can be seen in Table 4-2. The cables have an outer sheath of green
PVC.
Table 4-2 Color Coding of the Pairs
Pair
1 2
Conductor a white white
Conductor b blue orange
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