Operating instructions

Industrial Ethernet OSM/ESM
C79000-Z8976-C068-04
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Functions
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This chapter discusses the general functions of the OSM/ESM, in particular the
properties of the switching technology.
Increased Network Performance
By filtering the data traffic based on the Ethernet (MAC) address of the DTEs, local
data traffic remains local, only data intended for nodes in another network segment
are passed on by the OSM or ESM. This reduces the data traffic in the network
segments and lowers the network load in the network segments.
Simple Network Configuration and Network Expansion
OSMs and ESMs store the data received at the ports and the direct it to the
destination address. The restriction of the network span resulting from collision
detection (CSMA/CD) ends at the OSM/ESM port. With multimode graded-index
fibers, a total network span of up to 150 km and more can be achieved without
problems. With the OSM ITP62-LD, the monomode fibers allow a network span of up
to 1300 km.
Limitation of Errors to the Network Segment Affected
OSMs and ESMs only pass on valid data. Invalid packets are discarded so that bad
packets within a network segment have no effect on any other segment attached to
the OSM/ESM.