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Glossary
Glossary-5
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
Mirroring
Mirroring allows you to mirror (copy) the bi-directional data traffic to an
OSM/ESM port (mirrored port) to another OSM/ESM port (monitor port) and to
record it with a commercially available protocol analyzer for diagnostic purposes.
Multicast address
A packet with a Multicast address can be received by several nodes prepared to
accept this address.
Operative software
see firmware
OSM
SIMATIC NET Industrial Ethernet Optical Switch Module (includes optical and
electrical ports).
Oversize packets
Packets with a valid CRC and a length (packet size, see below) greater than
1536 bytes.
Packet size
Length of a packet from the destination address to the CRC field inclusive.
Partition mode
If more than 60 collisions occur during transmission, the OSM/ESM changes to
the Partition mode. It waits for the first valid package before it returns to the
normal transmission mode. In the Partition mode, it continues to send but no
longer receives (partitioned).
Port
(Ethernet) interface of the OSM/ESM
Port locking
Locking is used to ensure that only packets from authorized stations are passed
on via the OSM/ESM, see Section 2.6.
Port name
A name that can be assigned to every port of an OSM/ESM in the network
management system.
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