Fiber optic channel extender interface method and apparatus

Details Fiber optic channel extender interface method and apparatus Fiber optic channel extender interface method and apparatus

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.

REFERENCES:
patent: 4748617 (1988-05-01), Drewlo
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).

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