| 摘要 |
A digital/audio signal interface for craftperson's butt-in test set is configured to allow either audio signals or serial digital communication signals, such as those associated with the downloading of software for reconfiguring or upgrading the functionality of the test set, to be ported through a standard audio jack. The interface includes a controlled connectivity digital signal transport path coupled between the audio jack an d digital processor circuitry of the butt set. During a selected communication mode (audio or digital), the interface is operative to decouple the audio ja ck from test set circuitry associated with the other signal type (digital/audio ).
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