Bidirectional frequency shift coding using two different codes for upstream and downstream
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United States of America Patent
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Oct 23, 2007
Grant Date -
N/A
app pub date -
Mar 31, 2000
filing date -
Mar 31, 2000
priority date (Note) -
Expired
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Abstract
A method of transmitting bidirectional telephony communication signals on a single optical fiber. The bidirectional signals are transmitted in one direction as NRZ coded signals at a first clocking pulse rate, and in the other direction as Manchester coded signals at a second clocking pulse rate which is a multiple (preferably three times (3.times.)) of the first clocking pulse rate.
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