Pulse or digital communications – Repeaters – Testing
Patent
1981-03-11
1984-10-23
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
3408255, 375 36, H04L 2300
Patent
active
044792280
ABSTRACT:
An improved local computer network transceiver comprising transmitter, receiver, collision detection, and power supply circuits. The transceiver is connected between a plurality of host CPU controller interfaces and a coaxial cable with the coaxial cable being utilized as the communication medium at a nominal data rate of 10 megabits per second. The transmitter circuit includes triple redundancy in the output circuits to prevent single and double component failures from causing the transceiver to continuously jam the coaxial cable. The receiver circuit includes input compensation in order to permit use of the transceiver with long lengths of coaxial cable. The transceiver is capable of sending very wide pulses in order to aid in the location of coaxial cable impedance discontinuities (i.e. a time domain reflectometer function), and the ground planes associated with the host CPU interface cable and coaxial cable are physically separated by a plurality of interstage isolation transformers.
REFERENCES:
patent: 2852760 (1958-09-01), Eckhardt
patent: 4055835 (1977-10-01), Thornton
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4254496 (1981-03-01), Munter
patent: 4271505 (1981-06-01), Menot et al.
The Ethernet: A Local Area Network, Version 1.0, published by Digital Equipment Corporation, Intel Corporation, and Xerox Corporation, Sep. 30, 1980.
"Ethernet: Distributed Packet Switching for Local Computer Networks", by Robert M. Metcalfe and David R. Boggs, originally published by the Xerox Palo Alto Research Center, May, 1975.
"Practical Considerations in Ethernet Local Network Design", by Ronald C. Crane and Edward A. Taft, originally published by the Xerox Systems Development Division and Palo Alto Research Center, Oct. 1979.
"Measured Performance of an Ethernet Local Network", by John F. Shoch and Jon A. Hupp, originally published by the Xerox Palo Alto Research Center, Feb. 1980.
"Evolution of the Ethernet Local Computer Network", by John F. Shoch, David D. Redell, Yogen K. Dalal, and Ronald C. Crane, published by the Xerox Palo Alto Research Center and the Systems Development Department, Feb. 1981.
3Com Corporation
Safourek Benedict V.
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