Multiplex communications – Wide area network – Packet switching
Patent
1986-05-27
1988-05-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 300
Patent
active
047470992
ABSTRACT:
A PCM communication apparatus including a plurality of channel units which receive input signal and a multiplexer unit which multiplexes signals. Each channel unit includes a digital conversion circuit which responds to an input signal by encoding the input signal and outputting the encoded signal and which responds to the absence of an input signal by outputting a predetermined encoded signal having zero-value bit positions. The channel unit further includes a code conversion circuit that inverts the bit positions of the signal output by the digital conversion circuit which correspond to the zero-value bit positions of the predetermined encoded signal and then outputs the converted signal. The multiplexer unit includes a means for coupling data lines to a reference voltage, the channel units being connected to the data lines, and a plurality of code reconversion circuits which reinvert the bit positions of each pulled up converted signal which correspond to the zero-bit positions of the predetermined encoded signal. The code reconverting circuit then outputs a reconverted signal. Further, the multiplexer unit includes a multiplexing device for time division multiplexing the reconverted signals.
REFERENCES:
patent: 4293953 (1981-10-01), Gutleber
patent: 4468789 (1984-08-01), Gromen
patent: 4542492 (1985-09-01), Bodros et al.
CCITT Recommendation 6.704, "Functional Characteristics of Interfaces Associated with Network Nodes", International Telecommunication Union VIIIth Plenary Assembly, Red Book, vol. III, Facsimile III.3, pp. 69-80, Oct. 1984.
"Digital Networks-Transmission Systems and Multiplexing Equipment", CCITT, International Telecommunication Union, pp. 67-74, Nov. 1980.
Chin Wellington
NEC Corporation
Olms Douglas W.
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