Siemens SIMATIC NET Instrukcje Operacyjne Pobierz pdf (Strona 21)

Industrial Ethernet Networks

2-7

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

Industrial Twisted Pair (100BASE-TX)

Fast Ethernet over twisted pair is based on the standard IEEE 802.3u

(100BASE-TX) /5/ and operates at a transmission rate of 100 Mbps. The

transmission medium is a shielded cable with two twisted pairs with a characteristic

impedance of 100 ohms. The transmission properties of this cable must meet the

requirements of category 5 cabling (see Glossary). The maximum length of the link

between a DTE and network component (known as the link segment) must not

exceed 100 m. Termination is according to the 100BASE-TX standard with RJ-45

connectors, as an alternative, sub-D connectors are available in the SIMATIC NET

product range.

Twisted pair connections are always end-to-end connections between two

electrically active components. This means that there is always a direct link from

one DTE to a port of a network component. The network component is responsible

for regenerating received signals and distributing them by outputting the data again

to output ports. In SIMATIC NET Industrial Ethernet networks, this task is handled

by the OSM and ESM network components.

Fiber Optic (100BASE-FX)

The fiber-optic variant for 100 Mbps transmission rate in Industrial Ethernet is

based on the IEEE 802.3u standard (100BASE-FX) /5/. The transmission medium

is a multimode fiber-optic cable with glass fibers of the type 62.5/125 µm or 50/125

µm or a single mode fiber-optic cable with glass fibers of the type 10/125 µm.

Fiber-optic links are always end-to-end links between two active components. This

means that there is always a direct link between a network component and a port

of another network component. One network component is responsible for

regenerating received signals and distributing them by outputting the data again to

output ports. In the optical SIMATIC NET Industrial Ethernet network, these tasks

are handled by the Optical Switch Module (OSM) network component.

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