Siemens Comprehensive Guide to OSM Network Card Redundancy Management

Network Topologies with OSM/ESM

3.2Redundant Ring Structure

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 and interruption and therefore reestablishes a functioning bus configuration. A maximum of 50 OSMs are permitted in an optical ring. This allows reconfiguration time of less than 0.3 s to be achieved. The RM mode is activated on the OSM using a DIP switch (Section 4.2.4.1).

OSM ITP 62

OSM ITP 62
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OSM in	OSM ITP 62
RM mode
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OSM ITP 62 OSM TP 62 OSM TP 62

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OSM ITP 62 OSM ITP 53 OSM ITP

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1 Fiber-optic cable (FOC)

Figure 12: Redundant Ring Structure with OSMs

A redundant electrical ring can be established using ESMs in the same way. To achieve this the ESMs must be connected together using ports 7 and 8. One device must be switched to the redundancy manager mode. With ESMs and a maximum of 50 devices in the ring, a reconfiguration time of less than 0.3 s can also be achieved.

Industrial Ethernet OSM/ESM	31
C79000-Z8976-C068-10