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It is dependability and stability to the main demand of system of communication power source.
The influence face that general communication equipment malfunctions is lesser, be local sex, but if communication power source ties unified day,malfunction, communication system will be interrupted entirely, so power source system should have backup facility, power source equipment should have spare parts of machine parts or tools kept in reserve, town report should have two-way or multichannel input, communication and dc each other are reserve.
Our country is to the requirement of communication power source: The measure that prevent thunder asks to perfect, the range of wave motion of communication input voltage that equipment permits is big, multiple reserve the system interrupts breakdown completely with preventing power source system to produce power source. Distributing as a result of electrified wire netting and use the conditional existence differ in thousands ways of town report, the range of wave motion of town report voltage of a lot of places is very big. Especially station of a few transformer substation, microwave, smooth communication station, module, sometimes limits of alternating voltage wave motion amounts to ±30 ％ above. To increase the availability of town report, equipment of demand power supply has wider working voltage range, be about to add stabilized voltage unit otherwise.
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