SONET is the base for the physical layer of broadband integrate network. Above the SONET a layer called asynchronous transfer mode runs and SONET fixes the limits of a base rate of 51.84 Mbps. Broadband Integrated Services Digital Network (BISDN) is both a concept and i

t is also a set of services and developing standards for integrating digital transmission services in a broadband network of fiber optic and radio media. BISDN encompasses frame relay service for high-speed data that can be sent in large bursts, the Fiber Distributed-Data Interface.

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SONET allows various kinds of formats to be transmitted on one line. Before SONET was used, communication between the various localized networks was expensive because the digital signals were different. SONET was developed to deal with this problem and it standardized the rates and formats, with the Synchronous Transport Signals (STS) as the fundamental building block. The STS is divided into two parts, the payload tha

Some common words found in the essay are:
Line Terminating, National Institute, Signals STS, Network BISDN, Interface SONET, Terminating Equipment, path tier, section tier, line tier, tier photonic tier, section tier photonic, tier section tier, line rates, tier photonic, physical medium, terminating equipment, photonic tier, tier section,
Approximate Word count = 528
Approximate Pages = 2 (250 words per page double spaced)