Apparatus and method for high speed flexible multiplexing for fi

Details Apparatus and method for high speed flexible multiplexing for fi Apparatus and method for high speed flexible multiplexing for fi

1991-10-21

1994-10-18

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

Serial to parallel

341101, 375120, 331 25, H03M 900

Patent

active

053572491

ABSTRACT:
Disclosed is a method and apparatus for flexibly converting an electrical parallel digital data signal to a serial optical digital data signal for transmission along a fiber optic cable and then subsequent conversion back to a parallel electrical digital data signal. An input conditioner circuit is used to set a ratio between a transmission link clock rate and a sample clock rate such that the ratio determines the number of bits being transmitted for a sample word thus enhancing the flexibility of the device to different sampling rates. Each individual sample word is a frame of data which includes a single frame bit set up in a 4-bit frame pattern. A first frame bit is a sync acquisition bit comprised of an alternating sequence of "0"s and "1"s, a second and fourth parity bit computed from the parity of the previous two words of data, and a third channel identification bit. An output conditioner circuit receives the serial stream of data bits to convert it back to a parallel data format. The output conditioner further must identify and remove the frame bits as discussed above for proper processing. By this, the system can transmit data at flexible sample rates.

REFERENCES:
patent: 3742199 (1973-06-01), Lubarsky
patent: 4608702 (1986-08-01), Hirzel et al.
patent: 4675652 (1987-06-01), Machado
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patent: 4728930 (1988-03-01), Grote et al.
patent: 4751699 (1988-06-01), Tarridec et al.
patent: 5030951 (1991-07-01), Eda et al.

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