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Communications blackout
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Communications blackout : ウィキペディア英語版
Communications blackout

In telecommunications, communications blackouts are
* a cessation of communications or communications capability, caused by a lack of power to a communications facility or to communications equipment.
* a total lack of radio communications capability, caused by ionospheric anomalies, e.g., during strong auroral activity or during re-entry of a spacecraft into the Earth's atmosphere.
==Technical failures==
Uptime being a key goal of most communications networks, uninterruptible power supplies and backup generators are typically used to ensure high-reliability power.
Wireless networks may be subject to radio jamming; wired networks can be physically severed. Network design can also play a role in maintaining communications reliability; depending on the constraints in building a fiber-optic network, a self-healing ring topology may be used.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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