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740型调解器是一种具有19、2千比特秒传输速率的同步设备,可以在二线、宽带和同轴电缆等网络中进行半双工或全双工工作.它用于全负荷的闭合电视(CATV)网络时无需作任何改进.并允许56台点对点设备工作在一个电视信道频谱上,当系统的信杂比为25分贝时,误差率可望达到1×10~(-8).它提供有六个状态指示器和九个控制开关、其中一个开关选择返环工作方式,即本设备重发它接收到的数据.本设备由美国数传机公司制造,售价750美元,13周以内交货.
The 740 Modem is a synchronous device with a 19,2 kilobit-second transfer rate for half-duplex or full-duplex operation in networks such as two-wire, broadband and coaxial cables. It is used for full-load closed-circuit television (CATV) network without any improvement and allows 56 point-to-point devices to work on a TV channel spectrum, when the system SNR is 25 dB, the error rate is expected to reach 1 × 10 -8. It There are six status indicators and nine control switches, one of the switches to select the loop back to work, that is, the device retransmits the data it receives.This device is manufactured by the American digital transmission company, priced at $ 750, 13 weeks Delivery within.