H - Electricity – 04 – L
Patent
H - Electricity
04
L
363/17
H04L 25/38 (2006.01) H04L 25/05 (2006.01)
Patent
CA 1292817
ABSTRACT OF THE DISCLOSURE A method and apparatus for transmitting a synchronous data signal (D1) on a transmission medium on which the transmis- sion rate (Y bits/s) is greater than the data signal bit rate (X bits/s) are described. The data signal is converted in a trans- mitter by over-sampling with a sampling frequency (Y Hz) which is equal to the transmission rate (Y bits/s) on the transmission medium, whereafter the data signal (D2) formed by the conversion is transmitted on the transmission medium. A clock signal (C2) is formed in a receiver, this signal being phase-locked to the transmitted data signal (D2') and having a frequency (X Hz) equal to the bit rate (X bits/s) of the original, synchronous data sig- nal (D1), subsequent to which the transmitted data signal (D2') is re-sampled with the clock signal (C2) formed in the receiver. To avoid problems which can be caused by certain special bit com- binations of the synchronous data signal (D1) or of certain spe- cial frequency conditions between it and the transmitted signal (D2'), the data signal (D1) is converted in the transmitter such that an uneven distribution of the edges of the trnsmitted data signal (D2') in relation to their mean positions is avoided.
560783
Forsberg Gunnar Stefan
Josefsson Stefan Evert
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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