resilient packet ring (802.17) (RPR)
The Resilient Packet Ring (RPR) is an activity of the IEEE 802.17working group. The aim of this activity is to develop a transmission protocol for redundant Ethernet ring structures for high transmission rates that can be used in LANs, MANs and WANs for the transmission of data packets at scalable data rates. Here, the advantages of Sonet/ SDH and Ethernet are to be used, but at the same time their disadvantages are to be avoided.
The RPR standard defines a very fast RPR protocol with high reliability that is optimized for packet transmissions in elastic ring topologies. Existing standards are optimized for either time division multiplexing(TDM) or meshed topologies.
In addition, this development is intended to speed up the reconfiguration of networks in the event of a fault. The RPR concept is intended to correct errors in the shortest possible time. The RPR protocol is a Layer 2 protocol with a new MAC format.
In terms of topology, an RPR network is a double ring, comparable to FDDI. The Resilient Packet Ring has data rates of 622 Mbps, 1 Gbps and 10 Gbps. Since RPR does not define its own physical layers, it builds on the existing physical layers of Gigabit Ethernet and 10 Gigabit Ethernet.