Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-10-29
1993-03-30
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359113, 359152, H04B 1000, H04B 1024
Patent
active
051989182
ABSTRACT:
Methods and apparatus for operating an optical communications system having at least two communicating entities (10,12). In accordance with a method of the invention a first step transmits communication link control information from a first entity to a second entity over a first optical channel having a first data bit rate. Responsive to the transmitted communication link control information, a second step of the method transmits data information from the second entity to the first entity over a second optical channel having a second data bit rate that is greater than the first data bit rate. The first optical channel is preferably a relatively low-bandwidth diffuse transmission infrared radiation channel. The second optical channel is preferably a relatively high-bandwidth infrared channel. One of the entities is a network adapter coupled to a wired network. The network adapter is preferably ceiling mounted. The other entity may be a mobile data processor. A plurality of mobile data processors may be served by one network adapter.
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Freitas Richard F.
Harrison Colin G.
Hortensius Peter D.
Bacares R.
Coles Sr. Edward L.
International Business Machines Corp.
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