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Configuring Networks

3-30

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

3.5.3 Redundant Ring Structure with OSMs

Redundant Optical Ring

With the aid of an OSM functioning as the redundancy manager (RM), both ends

of an optical bus made up of OSMs can be closed to form a redundant optical ring.

The OSMs are connected together using ports 7 and 8. The RM monitors the OSM

bus connected to it, closes the bus if it detects an interruption and therefore

reestablishes a functioning bus configuration.

A maximum of 50 OSMs are permitted in an optical ring. This allows a

reconfiguration time of less than 0.3 s to be achieved. The RM mode is activated

on the OSM using a DIP switch.

The maximum length of the fiber-optic cable between two OSMs is 3,000 m. This

means that an optical ring including 50 OSMs can have a maximum span of 150

km.

Note

The reconfiguration time of less than 0.3 s can only be achieved when no

components (for example switches from other vendors) other than OSMs are used

in the redundant ring.

In a ring, one device and one device only must operate in the redundancy

manager mode.

DTEs or complete network segments can be attached to ports 1 – 6 of an OSM

operating in the RM mode.

1 Fiber-optic cable

OSM in

RM mode

OSM ITP 62

OSM ITP 62 OSM ITP 62 OSM ITP 62

OSM ITP 62

Figure 3-11 Redundant Ring Structure with OSMs

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