SDH STANDARDS

SDH is a European version of SONET standard which is an ANSI standard. The new standard appeared first as SONET, drafted by Bellcore in the United States, and then went through revisions before it emerged in a new form compatible with the international SDH.

The original SDH standard defined the transport of 1.5/2/6/34/45/140 Mbps within a transmission rate of 155.52 Mbps and is being developed to carry other types of traffic, such as asynchronous transfer mode (ATM) and Internet protocol (IP), within rates that are integer multiples of 155.52 Mbps. The basic unit of transmission in SONET is at 51.84 Mbps, but in order to carry 140 Mbps, SDH is based on three times this (i.e., 155.52 Mbps [155 Mbps]).

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