Operating instructions

Configuring Networks
3-24
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
3.4 Configuring an Electrical 100 Mbps Switched LAN
Products
The following components and cables are used in a 100 Mbps switched LAN:
S Components
– Electrical switch module ESM
S Cables
– Twisted pair cable
– TP cord
3.4.1 Twisted-Pair Links
100BASE-TX
The twisted-pair ports of the ESM comply with the IEEE 802.3u: 100BASE-TX
standard. The connectors are either sub-D-9 or RJ-45 jacks depending on the
ESM variant.
Requirements of Twisted Pair Cables
The twisted-pair cables between two adjacent ESMs must not exceed the following
maximum lengths:
Table 3-6 Max. Cable Lengths with Twisted-Pair Cables
Cable Structure Cable Type Max.
length
Max. Total of the Patch
Cables (TP Cord)
In one piece ITP standard 2x2
(with sub-D
connectors)
100 m –
Structured FC standard cable
FC trailing cable
FC marine cable
(connected to RJ-45
FC outlet)
90 m
75 m
75 m
10 m
10 m
10 m