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101

Network Topologies with OSM/ESM

Industrial Ethernet OSM/ESM

C79000-Z8976-C068-04

3.2 Redundant 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 in

RM mode

OSM ITP 62

OSM TP 62

OSM ITP 62

OSM ITP 62 OSM ITP 62

1 Fiber-optic cable (FO)

OSM ITP 53

Figure 9: Redundant Ring Structure with OSMs

A redundant electrical ring can be established using ESMs in the same way. To

achieve this the ESMs are 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.

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