发明名称 Digital telephone switch with simultaneous dual PCM format compatibility
摘要 A PCM telephone switch that is simultaneously compatible with both DS-1 and CEPT PCM formats is disclosed. A switch module performs timeslot switching of individual subchannels between DS-1 and CEPT trunks which are input by way of digital group interfaces. Each group interface couples to one or more trunks of serial bit streams of either DS-1 or CEPT format standards. After the input serial bit stream is converted to a parallel format, it is used as eight bits of the address bits of data processing ROMs from which a corresponding 8-bit word is parallel read on a per channel basis and routed to the appropriate output data processing ROMs. The output data bits of the ROMs are the processed data bits which are reconverted to serial format for either DS-1 or CEPT standards as required by the output trunk. A-law or mu -law decoding and encoding is accomplished independently from input to output channel on a per channel basis.
申请公布号 US5060227(A) 申请公布日期 1991.10.22
申请号 US19890385842 申请日期 1989.07.26
申请人 MOTOROLA, INC. 发明人 FINLEY, ROGER W.;LUBIN, BARRY D.;BERGENDAHL, BRUCE A.
分类号 H04J3/16;H04Q11/06 主分类号 H04J3/16
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