Siemens SIMATIC S7-1200 Gebruiksaanwijzing - Pagina 33

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Siemens SIMATIC S7-1200 Gebruiksaanwijzing

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.

Twisted Pair

Compact Switch Module CSM 1277

Operating Instructions, V. 1.20, A2B00079397B