Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-03-13
1989-02-28
Safourek, Benedict V.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455601, 370 1, 34082502, H04B 900, G08B 500
Patent
active
048093629
ABSTRACT:
A communication network and method implementing a star-tree topology utilizes conventional hardward and the CSMA/CD protocol. The network comprises in one embodiment at least two sets of user devices, in turn comprised of at least two user devices, connected through optical connectors and intelligent hubs to one another. Within each set of devices, the devices themselves are connected together by optical connectors through an optical coupler and an intelligent hub.
The method according to one embodiment involves the steps of assigning unique addresses to each hub and subhub in the network and of assigning a device address to each user device. The device address need only be different from the addresses of the other devices in the family. The messages are sent from any one station through a passive coupler to all the other stations connected thereto. If an exclusive OR situation exists whereby either but not both the subhub of the family is the source subhub or the destination subhub then that subhub copies the message and rebroadcasts the message either to its own family or to its parent.
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"The Principles and Performance of HUBNET: A 50 Mbit/s Glass Fiber Local Area Network", by Lee et al, IEEE Journal on Selected Areas in Communications, vol. SAC-1, No. 5, Nov. 1983, pp. 711-720.
Ikeman et al.; "High-Speed Network Uses Fiber Optics;" Electronic Week; Oct. 22, 1984; pp. 95-100.
Claus Richard O.
Sankar Ashok
Center For Innovative Technology
Safourek Benedict V.
Telesz Jr. Andrew J.
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