RPR, pseucdo wires boost service-provider networks

摘要

"Native" circuit services such as circuit voice and fax constitute an ever-dwindling percentage of service-provider (SP) network traffic. Since essentially all other key SP services come in the form of native packet or cell traffic, the growing demand for these services is driving SP network evolution. Transport in traditional SP networks is based on SONET/SDH technology. These networks are optimized to carry constant-bandwidth circuit services and thus support bursty packet services quite inefficiently due to their inflexible multiplexing. To address such limitations, IEEE 802.17 resilient packet ring (RPR) was developed. In contrast to SONET/ SDH, RPR is a resilient transport technology optimized for carrying packet services.