Data transmission system

Details Data transmission system Data transmission system

H - Electricity

04

B

26/129, 337/71

H04B 3/00 (2006.01) H01B 11/02 (2006.01)

Patent

CA 1258700

- 21 - Abstract: A parallel data transmission system comprises a cable which is capable of balanced mode transmission but which is driven in an unbalanced mode. The cable includes a plurality of twisted pairs of individually insulated conductors enclosed by a metallic shield. The twist lengths are relatively short to cause the pairs to be decoupled sufficiently from one another to allow substantially error-free, parallel transmission over relatively long distances. Interposed between the core and the shield is a spacing member which has a relatively low dielectric constant. Receiving facilities are provided for detecting whether the level of transmitted signals is above or below predetermined threshold values and for converting the received signals into one of two or more logic levels. Advantageously, this system increases substantially the distances over which substantially error-free transmission in an unbalanced mode can be accomplished.

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