Local area network system with constant tap level

Details Local area network system with constant tap level Local area network system with constant tap level

1984-12-24

1986-12-30

LaRoche, Eugene R.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

455 5, 34082505, H01P 516, H03H 748

Patent

active

046332022

ABSTRACT:
A passive, single cable, local area network system includes two directional couplers at each cable tap to provide bi-directional communications for each communications terminal. Each coupler introduces some amount of signal power loss through the cable such that the signal power level between any two communicating terminals depends on the cable distance between them, measured in number of intervening cable taps. Selectable attenuators are provided between the directional couplers and the corresponding communications terminals to virtually equalize the signal power level between any two terminals. The value of attenuation is selected according to a relationship including the number of cable taps in the system, the signal power loss along the cable introduced by each directional coupler, and the ordinal number of the corresponding terminal from the cable termination in the direction toward which the terminal's directional coupler communicates.

REFERENCES:
patent: 3619504 (1971-11-01), De Veer
patent: 3747028 (1973-07-01), Pennypacker
patent: 4079319 (1978-03-01), Bracke
patent: 4556881 (1985-12-01), Basile

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