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Abstract

In a system where a first telecommunications signal is mapped into a second telecommunications signal, where a FIFO is used to store first signal data bits which are being mapped into the second signal, and the number of bits stored in the FIFO (i.e., FIFO 'depth') is used in determining whether to generate a stuff or destuff signal, jitter is partially limited by, upon receiving an indication that the payload pointer of the second signal is moving in a first direction, generating a compensative payload pointer movement of the first signal in a second direction which is opposite the first direction. Additional jitter is removed by suspending the FIFO measurement from the time of the pointer movement in the second telecommunications signal until after the pointer movement and byte stuff or byte destuff in the first telecommunications signal has been accomplished, at which time the FIFO measurement resumes. In the case of the mapping of TUG-3 signals into an STS-3C signal, measurement of the FIFOs stops from the time the byte after the H2 byte of data is received from the STS-3C signal (right after the STS-3C pointer movement is detected) to the time after the next H1, H2, H3, and the byte after the H3 byte of data are written in the TUG-3 signal (after the TUG-3 pointer movement takes place).

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