Data transmission system

Details Data transmission system Data transmission system

H - Electricity

04

B

354/67

H04B 3/00 (2006.01) H04B 3/23 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1226949

1 1 ABSTRACT: A data transmission system using a transmis- sion code in which one data state corresponds to a zero transmission level, such as the Alternate Mark Inversion (AMI) code, includes at each terminal adaptive signal processing circuits such as an echo canceller (402) and/ or an adaptive equaliser (409). Each terminal includes a decision circuit (408) an output of which controls a switch (410) which is operative to allow updating of the adaption of the echo canceller (402) and adaptive equaliser (409) only when a data state corresponding to a zero transmission level is detected.

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