Switching system for switching a fixed-length cell

摘要

The invention relates to a multi-stage message channel switch comprising for exchanging communication data between a given number of incoming terminals and a given number of outgoing terminals. This switch comprises a first stage including a plurality of unit switches (primary switches) each having an integral number m of incoming lines, an integral number r of outgoing lines and the ratio of 1 to x between the incoming line speed and the outgoing line speed, a middle stage including a plurality of unit switches (secondary switches) each having an integral number k of incoming lines and an integral number k of outgoing lines, and the ratio of 1 to 1 between the incoming line speed and the outgoing line speed, and a final stage including a plurality of unit switches (tertiary switches) each having an integral number r of incoming lines, an integral number m of outgoing lines, and the ratio of x to 1 between the incoming line speed and the outgoing line speed, the primary switches being in the number of k, the secondary switches in the number of r, and the tertiary switches being in the number of k, the r outgoing lines of the primary switches being connected to the secondary switches respectively, the k outgoing lines of the secondary switches being connected to the tertiary switches, respectively, the relationship $(the\; symbol$ indicates\; the\; minimum\; integral\; number\; equal\; to\; or\; larger\; than\; (m-1)/(x-1))\; being\; held.\mathop{\mathrm{image}}$$