The dS-NET-I/O Switcher provides cascadable 16-into-2 relay switching, and may be used for switching either analogue or digital (AES3) audio signals. The I/O Switcher is primarily intended for use with the dScope Series III test and measurement system. It is serially-controlled using the Prism Sound dS-NET protocol. The two 'Bus' connections are each provided on both male and female XLR connectors, allowing each to be used as either an 'input switcher' (to drive dScope's analyzer inputs from a selection of many EUT outputs) or an 'output switcher' (to drive a selection of EUT inputs from the dScope's generator outputs). Many I/O Switchers can be cascaded together to make larger input or output switching matrices by connecting the second XLR connector to a daisy-chain of I/O Switchers. Alternatively, one of the I/O Switcher's buses can be used as an 8-into-1 input switcher and the other as a 1-into-8 output switcher.