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 ?
We considered Packet over SONET, IP and ATM, but found that Akara's Storage over SONET approach delivers the most economical, reliable, secure and scalable method of meeting customer's needs," said Terry Anderson, CTO at LightWave.
This broad family of 10GbE Load Modules operates seamlessly with Ixia's existing Load Modules, such as 10/100/1000 Mbps Ethernet, OC-3c/OC-12c/OC-48c/OC-192c Packet Over SONET (POS) and OC-48c/OC-192c BERT interfaces.
Agere's ORT8850L transceiver is a field-programmable system chip (FPSC) that provides networking equipment designers with proven backplane driver and receiver technology and customizable logic for transporting various traffic protocols over SONET metro- and wide-area networks such as Internet protocol (IP), asynchronous transfer mode (ATM) and packet over SONET (POS).
As a result, GFP makes it easier for service providers to perform switching tasks, avoiding overhead-intensive flag-based adaptation schemes, such as packet over SONET, used for IP router interconnection over wide area networks (WAN).