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PSTN:PublicServiceTelphoneNet-Work的缩写,意为公共电话服务网络。BPS:BitPerSecond每秒通过的比特数,是带宽的单位,用于衡量数据信道的信息传输率。调制解调器(MODEM):即Modulatot/Llel’1(x:llllato,是把数字信号和模拟信号相互转换的机器,它在发送端将计算机
PSTN: PublicServiceTelphoneNet-Work acronym for the public telephone service network. BPS: BitPerSecond The number of bits passed per second is the unit of bandwidth used to measure the data transmission rate of the data channel. Modem (MODEM): Modulatot / Llel’1 (x: llllato, is a digital signal and analog signal conversion machine, which sends the computer