IMPROVEMENTS IN OR RELATING TO AN ATM SWITCH

摘要

An ATM routing switch for bidirectional transmission of at least two types of cell (61), one type accepting variable bit rate of transmission and a second type accepting some loss of cells in transmission, includes first reserve buffer capacity (160) for cells of the first type, a second reserve buffer capacity (150) for cells of said second type and control circuitry (39, 40, 41) for generating a flow control signal (FCT) if a predetermined threshold for the first buffer capacity (160) is reached by input of cells of said first type, and discarding input cells of said second type if a predetermined threshold for said second buffer capacity (150) has been reached by input of cells of said second type.