packet over SONET


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packet over SONET

A metropolitan area network (MAN) or wide area network (WAN) transport technology that carries IP packets directly over SONET transmission without any data link facility such as ATM in between. Packet over SONET is intended to transmit data at the highest rates possible, because SONET has a smaller packet header overhead than ATM (28 bytes out of an 810-byte frame compared with 5 out of a 53-byte ATM cell). However, ATM has traditionally provided proven management and quality of service (QoS) for long haul transport. See RPR.


Transporting IP
In a LAN, IP generally runs over Ethernet. In a WAN, it typically is transported by ATM, which rides over SONET, and increasingly, directly over SONET. In the future, it is expected that IP will run directly over DWDM fiber (rightmost diagram).
References in periodicals archive ?
By including Generic Framing Procedure (GFP), Link Access Procedure for SDH (LAPS) and Packet over SONET (PoS), the VSC9118/VSC9115 can provide flexible mapping of Ethernet and SAN data traffic into OC-48/OC-192 SONET/SDH networks.
Based on the OUSP's ability to support all data center protocols, Digex can utilize its existing Gigabit Ethernet interface, rather than purchase an expensive Packet over SONET interface on the same device.
Ixia also offers a fully integrated OC-192 Packet Over SONET, OC-192 BERT and 10GBASE-W solution within a single Load Module (POS/BERT/WAN).
5 Gb/s and a variety of protocols including Ethernet, Fibre Channel and Packet over SONET, as well as value-added services such as digital video broadcast.