
Glossary
Glossary-3
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
ESM
SIMATIC NET Industrial Ethernet Electrical Switch Module (has only electrical
ports).
Event log table
A table in which certain events detected by the OSM/ESM are stored in
non-volatile memory for diagnostic purposes. The log table of the RMON MIB is
stored under events and is therefore a dynamic part of the MIB.
Fault mask
The fault mask is used with the OSM/ESM to mask out certain fault events.
Events that are not masked cause the signaling contact to respond and are
displayed by the fault LED.
Filtering database (FDB)
See FDB table
Firmware
Module software, in this case software running on the OSM/ESM.
Firmware version
Version of the OSM/ESM firmware
Flow control
A function on the OSM/ESM with which the number of packets received at the
OSM/ESM can be reduced in case of overload to reduce the risk of packet loss.
Full duplex mode
An OSM/ESM port operating in the full duplex mode can receive and send data
at the same time.
Full duplex flow control
The full duplex flow control of the OSM/ESM operates in compliance with the
IEEE 802.3x standard. If there is overload, the OSM/ESM generates pause
packets that stop or re-enable the sending of new packets by the connected
partner device. The partner device must support full duplex flow control.
Half duplex
An OSM/ESM port operating in the half duplex mode cannot receive and send
data at the same time. Data can only be received and sent alternately.
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