DIGITAL SIGNAL ADDING APPARATUS

Japanese Patent JPS6298836

A

In a transmission system, adding and/or dropping any one or more of a plurality of digital signals of one or more digital transmission bit rates is facilitated by employing a un- lque transmission signal in which data words associated with Individual digital signals are arranged in prescribed groups. The transmission signal data word groups are obtained by formatting the individual digital signals to be combined into a unique channel frame format common to all of the digital signals and by employing a unique one-step multiplexing process to insert digital words from the channel frames into the group of data word positions in the transmission signal associated with the particular signal being combined. Consequently, digital signals may be added to the transmission signal by formatting them into the common channel frame format and, then, inserting the digital words therefrom in the one-step multiplexing process into an associated group of data words positions in the transmission signal. Digital signals are dropped from the transmission signal by extracting associated groups of data words from the transmission signal, identifying the corresponding channel frames and deformatting the data bits from channel frames of corresponding digital signals being reconstructed.

ERITSUKU HANFUREI ANJIERU
TOOMASU JIYOSEFU APURIIRU
JIYUAN OSUKAA AZARETSUTO
RONGU CHIN FUAN
BAIONGU JII RII
BURIAN KURISUTOFUAA RONGUUERU
KUREIGU ARAN SHIYAAPAA
JIYAN DAIETSUTAA SUPAARINKU

JP19829886A

May 08, 1987

August 26, 1986

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AMERICAN TELEPHONE & TELEGRAPH

H04J3/08; (IPC1-7): H04J3/08

Masao Okabe

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