Multiplex communications – Wide area network – Packet switching
Patent
1985-09-24
1987-07-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 85, 370100, 375107, H04B 156, H04J 302, H04L 700
Patent
active
046791884
ABSTRACT:
A digital transmission system comprising at least two transmitting-receiving (T/R) units and a single transmission line connected therebetween. One of the T/R units the first transmits a control signal to the other T/R units with which frame synchronization and timing recovery are carried out using the transmitted control signal. At the same time, the other T/R unit inhibits transmission of send signal therefrom to the first T/R unit. Further, the send signal from one T/R unit to the other T/R unit is transmitted in the form of a frame. Each frame includes, at its end portion, a non-signal duration portion.
REFERENCES:
patent: 3641274 (1972-02-01), Sasaki et al.
patent: 4229815 (1980-10-01), Cummiskey
patent: 4564838 (1986-01-01), Boulgne et al.
Awata Yutaka
Fukuda Misao
Murano Kazuo
Tsuda Toshitaka
Fujitsu Limited
Olms Douglas W.
Scutch III Frank M.
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