digital switch network 数字交换网络
DSN Digital Switch Network 数字交换网络
digital optical switch network 数字光开关网络
digital network switch
数字网络交换机
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If digital communications are disrupted, the site can switch to analogue technology with assistance from the Radio Amateurs' Emergency Network.
BBC: Bunker mentality: The Cold War bunkers still in use
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