Operating instructions

Configuring Networks
3-7
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
3.2 Configuring an Industrial Ethernet Shared LAN
The following components and cables are used in an Industrial Ethernet network:
S Components
– OLM/ELM
– Star coupler with interface cards
– MINI OTDE
S Cables
– Fiber-optic cables
– Twisted-pair cable, TP Cord
– Triaxial cable
3.2.1 Values for Delay Equivalents and Variability Values
To check the two requirements above, you require the values of the delay
equivalent and the variable value of each individual component. These are
illustrated for the most important components in the tables below.
Optical Link Module (OLM)
Port 1 Port 2 Delay Equivalent Variability Value
FO FO 260 m 3 BT
FO ITP 360 m 6 BT
ITP ITP 190 m 3 BT
Electrical Link Module (ELM)
Port 1 Port 2 Delay Equivalent Variability Value
ITP ITP 190 m 3 BT
AUI ITP 190 m 3 BT