Method of exchanging data

Details Method of exchanging data Method of exchanging data

1990-03-16

1992-03-03

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8515, 34082505, H04L 1228, H04B 354

Patent

active

050938282

ABSTRACT:
A method of exchanging data in a network having a master station (M), at least one subscriber station and a common data channel according to a hierarchical token-passing principle comprises the following steps: a) at the start of the data exchange the master station (M) has sole possession of the control token; b) in order to initiate a data exchange the master station (M) sends a telegram with a time limit (T0L) specified by it to at least one receiver (E1); c) at least one receiver (E1) accepts the control token for a period limited by the specified time limit (T0L); d) at least one and every subordinate further receiver (E1, E2, E3) either passes the control token with a telegram and a further time limit (T1L, T2L) not exceeding the specified time limit (T0L) on to a subordinate further receiver (E2, E3), or allows the specified time limit to expire without relinquishing the control token; e) after expiry of the time limit (T0L) specified by it, the master station (M) again accepts sole possession of the control token.

REFERENCES:
patent: 4611274 (1986-09-01), Machino et al.
patent: 4667323 (1987-05-01), Engdahl et al.
patent: 4692761 (1987-09-01), Robinton
patent: 4800363 (1989-01-01), Braun et al.
Global Telecommunications Conference, 1987, 15-18, Nov. 1987, Tokyo, JP, IEEE (New York, U.S.), S. T. Vuong et al.: "Design and Implementation of the Access and Link Protocols for a Low-Cost Lan Using Electric Power Lines", pp. 1415-1421, see parags. 4-4.2.
1985 Nat'l Aerospace and Electronics Conference, May 20-24, 1985, IEEE (New York, U.S.), N. J. Alber et al.: "A Dual Channel High Speed Fiber Optics Multiplex Data Bus System", pp. 130-135, see p. 130, right-hand col., line 12, p. 131, right-hand col., line 26.
IBM Technical Disclosure Bulletin, vol. 24, No. 9, Feb. 1982 (New York, U.S.), C. D. Gravatte et al.: "Channel Access via Multiple Level Polling", pp. 4828-4831, see the whole article.

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