Telecommunications FIFO

Details Telecommunications FIFO Telecommunications FIFO

1987-10-05

1989-06-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375118, H04J 306

Patent

active

048398934

ABSTRACT:
A telecommunications FIFO provides an interface between two serial data transmission channels which have independent clocks and which can operate according to different protocols. The FIFO contains two storage registers each equal to a frame of data in length. Data is written into and read from alternate storage registers with the transfer between one register and the other occurring upon the receipt of write and read frame sync pulses respectively. At the receipt of each write frame sync pulse and read frame sync pulse, the read address location and the write address location respectively are sampled to determine if a FIFO overfill or empty condition is eminent. If such condition exists, the telecommunications FIFO does not switch registers, but rather rewrites the same register or rereads the same register respectively, to thereby perform a slip operation.

REFERENCES:
patent: 3867579 (1975-02-01), Colton et al.
patent: 4322844 (1982-03-01), Fellinger et al.
patent: 4392181 (1982-09-01), Le Dieu et al.
patent: 4402079 (1983-08-01), Fellinger et al.
patent: 4429386 (1984-01-01), Graden
patent: 4617659 (1986-10-01), Chopping et al.
patent: 4692894 (1987-09-01), Bemis
patent: 4764942 (1988-08-01), Shigaki et al.

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