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.

Abstract: In a system where jitter in a first telecommunications signal (e.g., TUG-3) which is being mapped into a second telecommunications signal (e.g., STS-3C) is reduced by moving the TUG-3 pointer in the opposite direction of the pointer movement of the STS-3C signal, and by suspending FIFO measurement from the time of the STS-3C pointer movement until the next TUG-3 stuff or destuff, the improvement is in further limiting jitter by moving the measurement points for the TUG-3 FIFO measurements without conducting TUG-3 pointer movements when the TUG-3 pointer movement would otherwise be moved into or over the transport overhead of the TUG-3 signal. The TUG-3 pointer movement is held in abeyance until two additional pointer movements in the same direction are received, and then the jump is made. During that time however, the measurement points for the TUG-3 FIFO depth measurements are moved by a byte each time the TUG-3 pointer movement is received.

Abstract: Jitter is limited in the mapping of a first telecommunications signal into a second telecommunications signal, by, upon receiving an indication that the payload pointer of the second telecommunications signal is moving in a first direction, generating a compensative payload pointer movement of the first telecommunications signal in a second direction which is opposite the first direction. The invention has particular application to the mapping of three E3 telecommunications signals which are in the format of a TUG-3 signal into an STS-3C SONET telecommunications signal in the STM-1 VC-4 format. When the STS-3C signal requires a pointer movement due to frequency compensation in the system, a compensative pointer movement at the TUG-3 level avoids eight units of jitter in the TUG-3 signal which could adversely affect system performance.