Data transmission system and apparatus providing multi-level dif

Pulse or digital communications – Repeaters – Testing

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341 56, 375 36, H04L 2534, H04L 2549

Patent

active

051669560

ABSTRACT:
A data transmission system which provides differential transmission of a multi-level interface corresponding to a binary interface formed by a plurality of binary input signals. The binary interface is encoded by an encoder into a corresponding multi-level differential interface formed by a plurality of multi-level signals, such correspondence being in accordance with a pre-selected code conversion table, and the respective multi-level signals are transmitted over respective transmission channels. Upon reception at a decoder, the signs of the differences between respective pairs of the multi-level signals are detected, and in accordance with such signs binary values are assigned to respective binary output signals of the decoder in accordance with the inverse of the code conversion table employed for encoding. Differential transmission achieves immunity from common mode noise, and multi-level encoding requires fewer channels than would be necessary for binary differential transmission.

REFERENCES:
patent: 4084069 (1978-04-01), Looschen
patent: 4489417 (1984-12-01), Askin et al.
patent: 4606046 (1986-08-01), Ludwick

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