High-speed data transmission in a rack system with coaxial board connectors

The speed at which data can be transmitted in communication rack systems is limited by crosstalk simultaneous switching noise in the data signal. The relationship between this noise and transmission speed is experimentally evaluated. The experimental rack system has 24 independently driven channels consisting of a driver-printed board assembly (PBA), connector, back panel (BP), connector and receiver-PBA. A small, high-density multicoaxial package connector is used and an error-rate detector is used to determine the error-free transmission speed at various receiver reference voltages. For a 45-cm line, the maximum speed of the rack system is 622 Mb/s for a 45 cm line.