Bit switching of word formatted data

Abstract From the Canadian patent

A digital switch for switching word formatted PCM digital data is disclosed. The data of each PCM word is serially bit switched rather than being switched in parallel as in conventional PCM switches. This is achieved by time multiplexing corresponding word bits of respective incoming channels or inlets onto a single data highway to form a bit interleaved digital bit stream. Data on the highway is switched through a RAM under control of a control memory according to the required connections so as to rearrange the order of the data bits. The rearranged data is demultiplexed to the respective outgoing channels or outlets. To avoid loss of alignment of word boundaries at the outlets, as between …