Method and apparatus for performing format conversion between bi

Details Method and apparatus for performing format conversion between bi Method and apparatus for performing format conversion between bi

1989-02-14

1990-12-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 79, 3701051, H04J 302, H04J 306

Patent

active

049791699

ABSTRACT:
Methods and apparatus are set forth that perform Format Conversion between bit streams which embed sub-rate circuit data according to different protocols. The invention (1) locates and extracts the sub-rate circuit data embedded, in an input serial bit stream, in accordance with a first predefined protocol (2) aligns the data in a buffer, and (3) creates an output bit stream in which the extracted circuit data is reformatted and inserted in accordance with a second predefined protocol. A programmable bit map driven format conversion module operates the data aligned in the aforementioned buffer. The conversion process is bidirectional and, in one embodiment of the invention, facilitates conversion between a single stage time division multiplexed data format and a two stage time division multiplexed format (e.g. X.50 and I.463) by utilizing the aforesaid bit map driven format conversion technique. More generally, the invention permits conversion between any two predefined protocols, permits great flexibility in network system configuration and permits multiple channels of different format or frame alignments to be converted simultaneously.

REFERENCES:
patent: 4276641 (1981-06-01), Nguyen et al.
patent: 4330856 (1982-05-01), Takasaki et al.
patent: 4545052 (1985-10-01), Steierman
patent: 4595907 (1986-06-01), Huffman et al.

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