Definition of: ISDN (Integrated Services digital Network) an international standard for switched, digital dial-up telephone service for voice and data.

定义：ISDN(综合服务数字网络)，是一个国际转换标准，是为了语音和数据的数码拨号上网电话服务。

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Introduction was made to the composition and working principle of a power-off time delay relay which adopts CMOS digital circuit, digital dial disc for switch setting and without auxiliary power.

介绍了一种采用CMOS数字电路、数字拨盘开关整定、无辅助电源的断电延时继电器的组成及工作原理。

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The article discusses about the proper selection of static relay test points through introducing the contactor sketch of rectifying static relays with digital dial switches and easy-happening faults.

通过对静态继电器整定用数字拨盘开关接点转换示意图和易发生的故障介绍，初步探讨了静态继电器的测试点的合理选择方法。

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Whether it's phone wire used for dial-up and digital subscriber lines (DSL), or the coaxial cables that carry cable modem connections, these connections are a bottleneck between the carrier's big pipes and your bandwidth-starved computer.

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Main.net's gear already serves 10, 000 European homes at speeds of 500 kilobits a second, roughly equal to average cable and digital subscriber line (DSL) speeds, but a tenfold increase over standard dial-up modems.

FORBES: Tilting at power lines