Tele-Communication (Telecom) Terms Glossary and Dictionary
SONET multiplexing is the process of transfering low speed traffic to high speed traffic in a SONET network. It involves generation of the STS-1 signal for each tributary. The STS-1 signal contains the payload traffic plus transport overhead allowing for a variety of tributary types to be accommodated. An STS-n signal is created by interleaving bytes from n STS-1 signals that are mutually synchronized, so there is no timing adjustment required when going to higher level multiplex formats. Drop Module Interfaces (DMI) provide SONET/SDH formatting and multiplexing/demultiplexing of the STS-1 signal; ports for low-speed DS1/E1, DS3/E3, STS-1, OC-1 lines; and termination and framing services for tributaries.