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packet over Sonet (PoS)

Packet over Sonet/SDH( PoS) is a standardized Layer 2 protocol for serial transmission of data over point-to-point links within the Sonet/SDH hierarchy. Mapping is performed according to RFC 1619, PPP over Sonet/SDH, and RFC 1662, PPP in HDLC-like Framing.

Packet over Sonet/SDH combines small data units for transmission. The method requires a small header and thus has low overhead, which means less bandwidth for the header. In the simplest PoS approach for inter-site LAN networking, Ethernet data is transmitted over unstructured SDH lines. Here, the Ethernet data stream is packaged via PPP encapsulation and fed directly to the add/drop multiplexer( ADM) in the SDH network. This is done using Point to Point Protocol (PPP), which can encapsulate datagrams with low overhead and performs link control using Link Control Protocol( LCP). In this procedure, PoS frames are mapped to SDH frames. The procedure is specified in RFC 2615.

PoS interfaces are used in the WAN from 155 Mbit/s to 2.5 Gbit/s, and there are also initial 10 Gbit/s versions. Bandwidth utilization is about 30% higher than ATM.

With Packet over Sonet/SDH, network operators can offer voice and data services over SDH networks without having to intervene in the SDH architecture or the configuration of the backbone.

Informations:
Englisch: packet over Sonet - PoS
Updated at: 13.10.2005
#Words: 206
Links: synchronous digital hierarchy (SDH), proof of stake (PoS), protocol, transmission, data
Translations: DE
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