Multiplex communications – Wide area network – Packet switching
Patent
1989-09-27
1991-02-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701051, 370108, H04J 306
Patent
active
049930265
ABSTRACT:
A multiplexer apparatus enables operation in a frame-phase synchronized manner regardless of delays which arise from differences in length of electrical cables that connect respective synchronizers to a multiplexer unit. The multiplexer apparatus comprises a clock supply for supplying a set of timing pulses including reference clock pulses and reference frame pulses; a first synchronizer for receiving lower-order data pulse streams each of which has a predetermined frame beginning with frame timing information and for generating a first set of data pulse streams the frames of which are aligned in phase with each other and synchronized with the reference frame pulses; a delay circuit for delaying the reference frame pulses to produce delayed reference frame pulses; a second synchronizer for receiving the first set of data pulses streams via electrical wirings and for generating a second set of data pulse streams the frames of which are aligned in phase with each other and synchronized with the delayed reference frame pulses. The delay of the delayed reference frame pulses is determined by respective differences in the arrivals of the first set of data pulse streams to the second synchronizer. The apparatus further includes a multiplexing circuit responsive to a second of data pulse streams and synchronized with the reference clock pulses for multiplexing a multiplex higher-order data pulse stream.
REFERENCES:
patent: 4310922 (1982-01-01), Lichtenberger et al.
patent: 4426713 (1984-01-01), Shimizu et al.
patent: 4608684 (1986-08-01), Upp
patent: 4644536 (1987-02-01), Utsumi
patent: 4685106 (1987-08-01), Miller et al.
patent: 4800560 (1989-01-01), Aoki et al.
patent: 4829518 (1989-05-01), Iguchi et al.
"256-Bit Elastic Store CMOS LSI"; Institute of Electronics and Communication Engineers of Japan, Paper of Technical Group on Semiconductors and Semiconductor Devices; vol. 78., No. 276. (Mar. 23, 1979, pp. 13-18).
Jung Min
NEC Corporation
Olms Douglas W.
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