Siemens SIMATIC S7-1200 Manual de instrucciones - Página 33

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Siemens SIMATIC S7-1200 Manual de instrucciones

Glossary

Aging time
The aging time is the time after which a learned MAC address is discarded if a CSM 1277
has not received frames with this sender address during this time.
Autocrossover
Technique with which a TP port is automatically switched over between MDI and MDI-X
assignment to make a connection independent of the port assignment of the device being
attached. This means that crossover cables are not required. The autocrossover function
can only be used when the port is set to autonegotiation mode.
Autonegotiation
Procedure standardized by IEEE 802.3 in which the transmission parameters (for example
10/100 Mbps, full/half duplex) are negotiated automatically between the devices.
CRC
Cyclic Redundancy Check. A checksum used in transmission protocols to detect errors in
frames.
Multicast
A frame with a multicast address is received by all nodes prepared to receive this address.
Segment
In the Ethernet bus system, transceivers connected together over the bus cable along with
the nodes connected over patch cables form a segment. Several such segments can be
connected via repeaters. When using twisted pair and fiber-optic cables, each subsection
forms a segment.
Store and forward
An entire frame is received, its validity checked (checksum, length etc.) and then buffered.
Invalid frames are discarded, in other words, a frame is forwarded only when it is error-free.
TP
Twisted Pair
Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B
33