Multiplex communications – Wide area network – Packet switching
Patent
1980-02-28
1983-01-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 16, H04J 302
Patent
active
043707440
ABSTRACT:
A time division multiplex communication circuit is constituted by a set of loop shaped transmission line pairs which transmits time division multiplexed signals via a clockwise transmission line and a counterclockwise transmission line, a center office connected to starting and terminal ends of the transmission line pair, and a plurality of local offices located at intermediate points of the transmission line pair. The center office includes a device connected to the starting and terminal ends of the transmission line pair for transmitting and receiving signals therewith, and a processing means for assigning time slots of time division multiplexed channels of the transmission line pairs to signals to be sent to the transmission line pairs and for sending an interoffice signal regarding the assignment of the time slots to the local offices. Each local office includes access means for accessing the assigned time slots of the time division multiplexed signals on the transmission line pair, and control means responsive to the interoffice signal sent from the center office for controlling the access means, whereby when a communication is made between two offices belonging to the loop, the processing means of the central office assigns time slot to said offices between which communication is made for causing the access means of the local offices to operate under control of the control means so as to form with the assigned time slots two route channels, one passing through a specific point on a transmission path provided by the transmission line pair, while the other not passing through the specific point thereby performing interoffice communications through at least one of the route channels under the control of either one of the processing means of the central office and the control means of the local office.
REFERENCES:
patent: Re28958 (1976-09-01), Zafiropulo et al.
patent: 3586782 (1971-06-01), Thomas
patent: 3652798 (1972-03-01), McNeilly et al.
patent: 3859468 (1975-01-01), Smith et al.
patent: 4144410 (1979-03-01), Flickinger et al.
Hirano Junzo
Inoue Yukio
Nippon Telegraph & Telephone Public Corp.
Olms Douglas W.
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