The protocol has been developed in view of the need for eliminating the limits set by the asynchronous hierarchy so as to meet the growing demands for improved flexibility and efficiency in line utilization.Initially the principal object was to develop a synchronous network with optical interfaces,designed and developed by different manufacturers, but all mutually compatible.
Subsequently other aspects were also taken into consideration and a synchronous system wasdefined which offered the following advantages compared with former methods:
- simplified multiplexing/demultiplexing techniques;
- direct extraction/insertion of lower speed tributaries without having to
- multiplex/demultiplex the entire frame;
- exchange operations, administrative and maintenance capability.
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