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RPR network

In terms of topology, the Resilient Packet Ring( RPR) is a double ring on which data can be sent in both directions with different priorities. The data in the ring always has priority. In the event of an error, the inner ring is connected to the outer ring, thus restoring data transmission. Recovery takes less than 50 ms.

In the event of an error, the RPR standard provides two protection mechanisms: steering and wrapping. In the case of steering, the node that detects the error sends a message to all network nodes. From the information sent, the nodes recognize the direction in which the following packets must be sent in the event of an interruption. Wrapping, which works with hardware-controlled switching, is comparable in function.

Structure of the Resilient Packet Ring (RPR)

Structure of the Resilient Packet Ring (RPR)

In the Resilient Packet Ring, the data packets are placed in the ring by a start node and taken out again directly by the destination node. This is called destination stripping. The data packets therefore only run from the start node to the destination node, which may well be two consecutive nodes. In contrast to Token Ring or FDDI, this procedure results in a significant bandwidth saving. Only with multipoint connections does the data frame pass through the entire ring.

Informations:
Englisch: RPR network
Updated at: 04.03.2008
#Words: 211
Links: indium (In), topology, resilient packet ring (802.17) (RPR), data, priority
Translations: DE
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