Cselt-Centro Studi E Laboratori Telecomunicazioni S.p.a.

Paolo Mancini

Carlo Demichelis

Paolo Mattone

An interface interposed between a PCM data terminal and a processor comprises a bus accessor dialoguing with the processor, input and output circuitry coupled to the terminal, and intervening logic circuits and data stores designed to supply the processor in a time-division mode with preprocessed messages received or to be transmitted over a multiplicity of channels. The interface is operable according to dialogue procedures of HDLC type such as those corresponding to CCITT recommendations X25, X75 and N. 7, with switchover from one protocol to another.

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S. Maurizio Canavese, Italy

Paolo Mancini