Communication network

Details Communication network Communication network

1989-02-24

1990-06-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 161, 370 8515, H04J 302, H04J 314, H04J 1500

Patent

active

049378112

ABSTRACT:
A communication network is provided for transmitting data in a hostile electromagnetic environment. Master and slave units are coupled to a data path by transformer coupling. The slave units can be turned on by applying a DC voltage between transfomer taps at the master, and detecting the voltage at corresponding taps at the slave. Separate pairs of conductors are used to carry signals transmitted by the master and signals transmitted by the slave. The conductors form a closed loop data path enabling the master to selectively transmit data either in a clockwise or counterclockwise direction around the loop. Data may also be received by the master either clockwise or counterclockwise around the loop. In this manner, the master can communicate with the slaves even if there is a break in the data path.

REFERENCES:
patent: 4733389 (1988-03-01), Pavogel
patent: 4769807 (1988-09-01), Niwa et al.
patent: 4771423 (1988-09-01), Ohya et al.

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