... 程控数字交换机 SPC digital switch 本地数字交换机 local digital switch ; LDS 数字交换机的功能 Digital exchange functions ...
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LDS Local Digital Switch 本地数字交换机
local digital switch
本地数字开关
以上为机器翻译结果,长、整句建议使用 人工翻译 。
With ISDN service, signaling that must be conveyed between the user station and the local switch is carried on a separate digital channel called the D channel.
与必须表达在用户驻地和本地开关之间的ISDN服务,发信号继续称D渠道的一条分开的数字通道。
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Under the Federal Communications Commission's requirement, cable operators must either switch to all-digital systems, or carry both the digital and analog signals of local stations in the first three years after the February 2009 conversion.
WSJ: Cable Must Air Broadcast Signals
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