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来自维基百科,自由的百科全书
信令,是指为使通信网中各种设备协调运作,在设备之间传递的有关控制信息。它用来说明各自的运行情况,提出对相关设备的接续要求。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.