Multiplex communications – Wide area network – Packet switching
Patent
1979-12-10
1982-01-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 41, 370112, H04J 302
Patent
active
043131930
ABSTRACT:
A time division multiplex transmission apparatus which transmits low-speed data and telegraph signals of a maximum of n.times.m channels as high-speed data in a multiplexed manner based on a time division system. The apparatus also separates received high-speed data into low-speed data and telegraph signals. The time division multiplex transmission apparatus includes m input/output units each comprising: a level converter circuit for converting the subscriber's line level signals of n channels to an internal logic level, a first microprocessor for regenerating the start-stop of n channels of signals and a function to regenerate telex signals, a programmable timer circuit for controlling the interruption time of n channels of signals into the first microprocessor, an interruption control circuit for determining the priority order of interruption of n channel of signals into the first microprocessor, a setting switch for setting a self-address to transfer the data to a time slot to which the high-speed data has been allotted, an address decoder for decoding address signals from the setting switch and a common bus, and a first bus driver receiver for transferring the data from the first microprocessor via the common bus; and a high-speed data processing device comprising: a second microprocessor for multiplexing and separating signals of a maximum of m.times.n channels, for generating and detecting the frame patterns and keeping frame synchronization, and for generating adresses of m.times.n channels, an address encoder for encoding address signals of the second microprocessor, and a second bus driver receiver for transferring the data from the second microprocessor into each of said input/output devices via the common bus.
REFERENCES:
patent: 3366737 (1968-01-01), Brown
patent: 3404233 (1968-10-01), Mason et al.
patent: 3749842 (1973-07-01), Poretti
patent: 3989892 (1976-11-01), Yoshida et al.
patent: 4032709 (1977-06-01), Reisinger et al.
Isago Takao
Iwama Masamichi
Nakano Tokutaka
Sakata Takao
Fujitsu Limited
Kokusai Denshin Denwa Co. Ltd.
Olms Douglas W.
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