Transwitch Corporation

Bart Brosens

Daniel C Upp

Suvhasis Mukhopadhyay

Sachin Mathur

Chitra Wadhwa

Kris Van Aken

Ramses Valvekens

Methods for retiming SONET signals include demultiplexing STS-1 signals from an STS-N signal, buffering each of the STS-1 signals in a FIFO, determining the FIFO depth over time, and determining a pointer leak rate based in part on FIFO depth and also based on the rate of received pointer movements. According to the presently preferred embodiment, each FIFO is 29 bytes deep. If FIFO depth is 12-17 bytes, no leaking is performed. If the depth is 8-12 bytes or 17-21 bytes, a slow leak rate is set. If the depth is 4-8 bytes or 21-25 bytes, a fast leak rate is set. If the depth is 0-4 bytes or 25-29 bytes, pointer movements are immediate. The calculated leak rates are based on the net number of pointer movements (magnitude of positive and negative movements summed) received during a sliding window of n&#xd7;32 seconds (n&#xd7;256,000 frames).

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Oelegem, Belgium

Bart Brosens