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Abstract

A back-pressure type ATM switch wherein a variety of high-quality and flexible services can be served with high hardware/software efficiency. A resource manager provided to each input buffer, performs rejection control of cells according to RTQL (Rejection Threshold Queue Length) of each of s.times.n input queues, RTQL of each of s QoS-class virtual resources and a minimum guaranteed resource of each of the s.times.n input queues referring to RTQL of a common resource. A shaper accompanying each of the s.times.n input buffers shifts cells into a virtual queue at a speed obtained by (minimum guaranteed speed)+(rate information).times.(active VC number of the input queue). A rate controller calculates the rate information as a function of the sum of the virtual queue of each of the s.times.n input queues of every of the input buffers. A back-pressure connector provided to the input queue read controller of each input buffer defines correspondence between back-pressures generated by output buffers and back-pressures referred to by the input queue read controller.

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