Abstract
AbstractAn asynchronous transfer mode (ATM) switching network handles not only traffic of various bandwidths, but multirate bursty traffic including constant bit rate and variable bit rate traffic as well. Consequently, to simplify the design and operation of the facility, it is desirable for the ATM network to be nonblocking at the connection level. The nonblocking issue when the network must handle variable bit rate traffic is related closely to the connection admission control (CAC) employed.While the nonblocking feature for a linear CAC function has been studied in the past, the relation between the switching network cell‐level quality and non‐blocking characteristic for a specific CAC premising variable bit rate traffic has not been analyzed.This paper examines a nonlinear CAC, evaluates the cell loss probability and statistical multiplex gain when it is applied and proposes the definition for a non‐blocking feature called “(p0, p, q) nonblocking.” Next, a cell distribution‐type, three‐stage ATM switching network is shown that ensures (p0, p, q) nonblocking for traffic including multicast connections without expanding the internal link capacity either in terms of space or speed.
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