Method and apparatus for transporting a synchronous or plesiochronous signal over a packet network
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United States of America Patent
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Issued Date -
Nov 21, 2002
app pub date -
Nov 2, 2001
filing date -
Mar 16, 2001
priority date (Note) -
Abandoned
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Abstract
Methods and apparatus for transporting a synchronous or plesiochronous signal over a packet network. The methods of the invention include providing incoming and outgoing packet counters at the 'local' user-network-interface (UNI) where the packets are to be reassembled into a synchronous or plesiochronous signal. According to the basic method of the invention, the UNI is provided with an adjustable clock and the clock rate is adjusted by comparing the incoming packet count with the outgoing packet count. In particular, if the outgoing packet count is smaller than the incoming packet count, the clock rate is increased. If the outgoing packet count is larger than the incoming packet count, the clock rate is decreased. In order to minimize delay in clock adjustments, a 'gear shift' adjustment algorithm is provided. The apparatus of the invention includes a phase locked loop (PLL) embodied in a programmable logic device (PLD).
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