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ＩＳＤＮ终端的供电问题是必须解决的难点之一，终端设备耗电量远大于常规话机，这给终端的远供带来了困难。ＣＣＩＴＴ建议提出了对ＩＳＤＮ终端供电的三种方式和诸多要求，实际应用中有很多问题要解决。本文以ＣＣＩＴＴＩ．４３０建议为依据提出了一种供电方式，较为合理地设计ＩＳＤＮ终端的供电系统：采用分散供电的方法，常态时大幅度减轻了交换机侧电源的负担，保证了供电系统的可靠工作；采用开关电源的技术，使终端电源的设计简单易行。
The ISDN terminal power supply problem is one of the difficulties that must be solved. The power consumption of the terminal equipment is much larger than that of the conventional telephone set, which brings difficulty to the remote terminal of the terminal. The CCITT proposal proposes three ways and many requirements for powering ISDN terminals. There are many problems to be solved in practical application. This article by CCITTI. 430 proposed a power supply based on a more reasonable design ISDN terminal power supply system: the use of decentralized power supply, the normal time greatly reduce the burden on the switch side of the power supply to ensure the reliability of the power supply system work; the use of switching power supply The technology makes the design of the terminal power supply simple and easy.