Patent
1977-12-14
1979-06-05
Brown, Thomas W.
H04J 304
Patent
active
041574583
ABSTRACT:
A serial-parallel converter converts serial mode 8-bit words, delivered from a plurality of primary digital multiplx highways into parallel mode 8-bit words and multiplexes the 8-bit words to form a signal for a supermultiplex highway. The converter comprises eight parallel-write, serial-read input shift registers and seven serial-write, serial-read output shift registers. The write inputs of the output shift registers are respectively connected to the serial output of the input shift registers having the same rank. The serial read outputs of the output shift registers deliver a serial output of the eighth input shift register to the supermultiplex highway. All of the input shift registers comprise eight stages. The output shift registers have decreasing numbers of stages from 7 down to 1. The writing operation, into input shift registers, and shifting operation through all registers are controlled by a single 8-stage shift register. That single shift register circuit may also be used for demultiplexing the signals on a supermultiplex highway and converting the resulting parallel-mode 8-bit words into serial-mode 8-bit words to be delivered to outgoing primary digital multiplex highways. That single shift register circuit is particularly well-suited for time division switching systems.
REFERENCES:
patent: 3821480 (1974-06-01), Dundon et al.
Brown Thomas W.
Laff Charles A.
Rockman Howard B.
Whitesel J. Warren
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