| 摘要 |
A modem utilizin a DAA having line side circuitry including a telephone network interface and system side circuitry including a host system interface. The line side circuitry and the system side circuitry are separated by a high voltage isolation barrier. In accordance with the invention, the high voltage isolation barrier and other DAA circuitry are configured such that information may be communicated between the system side circuitry and the line side circuitry in a digital format. In one embodiment of the invention, the high voltage isolation barrier comprises a single capacitor for communicating bidirectional digital data. In another embodiment of the invention, a pair of capacitors are provided in the high voltage isolation barrier, with the digital signals being driven in a differential manner. In yet another embodiment of the invention, a transformer is utilized for supplying clock signals and power across the high voltage isolation barrier, while a pair of capacitors (or a second transformer) is utilized to communicate bidirectional data.
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