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Overview

Packet over SONET (Synchronous Optical Network)/SDH (Synchronous Digital Hierarchy) is the serial transmission of data over SONET frames through the use of a protocol such as Point-to-Point Protocol (PPP).

Packet over SONET/SDH is an ideal feature for networks that are built for providing Internet or IP data. It provides superior bandwidth utilization and efficiency compared with other transport methods. For expensive WAN links, packet over SONET can provide as much as 25 to 30 percent higher throughput than networks based on Asynchronous Transfer Mode (ATM). By transporting frames directly into the SONET/SDH payload, the overhead required in an ATM cell header for IP over ATM encapsulation is eliminated.

The router supports PPP, Cisco High-Level Data Link Control (HDLC), and Frame Relay over SONET/SDH.

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