Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-11-06
1995-02-14
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, 375114, H04B 1012
Patent
active
053900413
ABSTRACT:
A digital optical serial communication system and encoding method comprises a transmitter responsive to an input of parallel information for parsing the information into 4-bit groups. The 4-bit groups are encoded into 5-bit codes having a 40/60 duty cycle and wherein no more than two consecutive bits are logical 1's or 0's on either end of the 5-bit code. The 5-bit codes are serially transmitted by an optical transmission medium for providing a conduit from the transmitter to a receiver. The receiver receives and decodes the serial information to 4-bit groups. The 4-bit groups are concatenated to form a parallel packet of information suitable for data processing. The encoding/decoding scheme has the advantages of (1) a worst case duty factor of 40/60%; (2) a maximum run of bits without transition equal to five; (3) an easily recaptured framing of packets due to a unique sync symbol; and (4) simple encoding and decoding of packets using combinational logic rather than lookup tables. In addition, data can be continuously sent via a communications protocol.
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patent: 4771440 (1988-09-01), Fromm
patent: 4791407 (1988-12-01), Prucnal et al.
patent: 4831622 (1989-05-01), Kuhn
patent: 5018152 (1991-05-01), Simcoe
ANSI.RTM. X3.148-1988, "American National Standard for Information Systems--Fiber Distributed Data Interface (FDDI)--Token Ring Physical Layer Protocol (PHY)," Computer and Business Equipment Manufacturers Association, American National Standards Institute, Inc. (1988).
Fromm Eric C.
Knecht Kevin M.
Cray Research Inc.
Kluth Daniel J.
Pascal Leslie
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