Lucent Technologies Inc.

Miguel Robledo

Bernd Markus K Bleisteiner

Ralph Steffen Urbansky

Konrad Sticht

Martin Saeger

Dirk Schmidt

A method and apparatus are provided for transmitting and receiving a plurality of individual tributary signals in multiplex form via a common line. At the transmitting end, the tributary signals, each of which has a similar initial frequency, are converted into a compound signal having a frame structure with a common data rate. At the receiving end, each individual tributary signal is retrieved from the compound signal with its initial frequency. A phase information signal portion including a respective phase difference between each tributary signal and the compound signal is formed and inserted into the compound signal in the shape of respective coded bits. The initial frequency of each tributary signal is recovered from the phase information signal portion included in the respective coded bits belonging to the respective tributary signals.

Method and apparatus for transmitting and recieving multiplex tributary signals

The invention relates to a data transmission system for the frame-oriented digital data transmission of a plurality of useful signals embedded in a carrier signal, using time-division multiplex operation, rate matching being undertaken between the useful signals and the carrier signal by means of stuff locations. The data to be stuffed, and the management information for the reassignment are embedded in previously unused 8 bytes in the path layer overhead of the carrier signal superframe, and protected by an HC(6,3,3) code. Clear channel signals can advantageously be transmitted using the system, and the transmission is time-transparent and data-transparent.

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Bavaria, Germany

Miguel Robledo