Lan communication system and medium adapter for use therewith

Details Lan communication system and medium adapter for use therewith Lan communication system and medium adapter for use therewith

1987-03-23

1989-02-07

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 86, 375 36, 178 2C, H04Q 900, H04J 300

Patent

active

048034851

ABSTRACT:
A communication system, medium adapter (10) for use therewith, and methods are provided which permit standard ring network transmission media (15) to support both ring and bus communication topologies and protocols, which may be selectively adapted to differing topologies and protocols without physical modification. Means (50) are provided for permitting each medium adapter (10) to maintain a continuous ring communication path in a quiescent state, and to break the ring and establish bus communication both originating and terminating at the transmitting adapter in a transmit state. The medium adapter provided may be used with existing 802.5 token-ring dual twisted pair wiring (19), while supporting existing 802.3 CSMA/CD, 802.4 token bus, or 802.5 token-ring interface hardware, among others.

REFERENCES:
patent: 4561092 (1985-12-01), Shaver
patent: 4697047 (1987-09-01), Hirai et al.
patent: 4704714 (1987-11-01), Tomizawa et al.
patent: 4707829 (1987-11-01), Pendse
EPO Search Report DTD 01/29/88.
IBM Tech Bulletin, vol. 29, No. 3, dtd Aug. 1986, pp. 1356-1360.
Paper Entitled "The Application of Local Area Networks to the Control Arch. of a Telephone Exchange".
Abstract of a Pat. Apl. Entitled: "Data Transmitting Device".
"Philan: a Fiber-Optic Ring for Voice and Data", IEEE Communications Magazine, vol. 24, No. 12, Dec. 1986.
"Making the Lan. Connection with a Fiber Optic Standard", Computer Design, Sept. 1, 1985.

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