Method of transmitting information between stations attached to

Details Method of transmitting information between stations attached to Method of transmitting information between stations attached to

1981-12-01

1984-11-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, H04J 600

Patent

active

044829990

ABSTRACT:
In a ring communication system comprising several stations, access to the ring is granted to one station at a time by a circulating token indication. A method is provided guaranteeing a transmission opportunity for synchronous or circuit-switched data in periodic time intervals to authorized stations. A CS monitor station issues a frame header which is marked in a specific bit position to allow only authorized stations to transmit their synchronous data together with a destination address. In a first embodiment, a single frame comprises a plurality of slots each having a free/busy indication, a destination address field and a field for synchronous data, and each authorized station can occupy one such slot. In a second embodiment, a marked frame can be used by only one authorized station for transmitting synchronous data, but a new marked frame header is reissued until all authorized stations around the ring have transmitted synchronous data.

REFERENCES:
patent: 3988545 (1976-10-01), Kuemmerle et al.
patent: 4078228 (1978-03-01), Miyazaki
patent: 4154983 (1979-05-01), Pederson
patent: 4251880 (1981-02-01), Baugh et al.
patent: 4312065 (1982-01-01), Ulug
J. Smet et al., "Pacuit Switching Combines Two Techniques in One Network", Computer Design, vol. 15, No. 6, Jun. 1976, pp. 83-88.
B. Penny et al., "Survey of Computer Communications Loop Networks: Part 1", Computer Comm., vol. 2, No. 4, Aug. 1979, pp. 165-180.
T. Tsuda et al., "Design of a Multi-Service Subscriber Loop System", NTG-Fachber, vol. 73, 1980, pp. 114-118.
Y. Ikeda et al., "Virtual Circuit Switching System: A new System Concept for Telephony and Data Integration", ISS, May 1979.
H. Mujahara et al., "Flexible Multiplying Techniques with Two Types of Packet for Circuit and Packet Switched Traffic", Trans of the IECE of Japan, vol. E64 No. 6, Jun. 1981, pp. 390-397.
P. T. Neale, "The DEMOS Multicomputer Ring: The Ring Closer", NPL Report, Oct. 1980, pp. 1-80.

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