H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 14/08 (2006.01) H04J 3/06 (2006.01) H04J 3/16 (2006.01) H04L 7/04 (2006.01)
Patent
CA 2130473
The SPE of an incoming STS-3 type signal is demultiplexed into three STS-1 payloads and fed to three FIFOs (45-1, 45-2, 45-3), and a byte which is synchronous with the TOH is tracked through the three FIFOs (45-1, 45-2, 45-3) to provide an indica- tion of the FIFO depth. A frame count is also kept to track the number of frames since a last pointer movement. Stuffs or destuffs are generated based on the FIFO depth as well as based on the frame count, with a stuff or destuff generated as quickly as four frames from a previous pointer movement if the FIFO is close to full or close to empty, and less quickly (e.g., at thirty-two frames from a previous pointer movement) if the FIFO is only starting to empty or to fill. Where the STS-3 type signal is an STS-3C sig- nal, the decision on whether to stuff or destuff is made with reference to all three depth measurement circuits (48-1, 48.2, 48-3) as all the STS-1 payloads must be stuffed or destuffed together.
Hamlin Robert W. Jr.
Parruck Bidyut
R. William Wray & Associates
Transwitch Corporation
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