时间：2023-03-25 14:58:02 | 来源：营销百科
时间：2023-03-25 14:58:02 来源：营销百科
网络工程师考试级别：ISDN，which stands for Integrated Services Digital Network， is a system of digital phone connections， which has been available for over a decade.This system allows data to be transmitted simultaneously across the world using （1） digital connectivity.With ISDN，voice and data are carried by bearer channels occupying a bandwith of （2） （bits per second）.Some switches limit B channels to capacity of 56 Kbps.A data channel （3） handles signaling at 16Kbps or 64Kbps，depending on （4） .Note that，in ISDN terminology，'k' means （5），and not 1024（2^10） as in many computer applications;therefore，a 64Kbps channel carries data at a rate of 64000bps. A new set of standard prefixes has recently been created to handle this. Under this scheme，'K'（Kilo） means 1000（10^3），'M' （Mega） means 1000000（10^6），and soon ，and 'Ki'（Kibi） means 1024 （2^10），'Mi' （Mebi） means 1048576（2^20）.and soon。关键词：级别,考试,工程师,网络
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