Glossary
SCALANCE X-300
Operating Instructions, 10/2010, A5E01113043-10
283
ESM
Electrical Switching Module – SIMATIC NET Ethernet switch with electrical ports
Event
For Alarms & Events: An event is anything that happens that could be of interest to a client.
Although events can also be generated when a condition is met, they are not necessarily
dependent on conditions. Events that are not linked to conditions include, for example, error
messages of the communication system.
Fault mask
Specifies the desired status (good status). Deviations from this occurring during operation
are handled as faults.
FO port
Fiber Optic port
Full duplex
Two-way simultaneous - both communication partners can send and receive at the same
time.
Half duplex
Two-way alternate transmission mode- it is only possible to either send or receive over the
interfaces at any one time.
High Speed Redundancy
Method used on SIMATIC NET switches to increase the network availability in a ring
topology.
See also ►media redundancy.
HSR
→
High Speed Redundancy
Latency
Latency specifies the time taken by frames to pass through an IE Switch X-300. This does
not include the time required for buffering frames.
LC
Lucent Connector
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