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所谓“明线高频载波电话设备”是指传输频率在150kHz以上的载波电话设备,如高12路、超24路和超12路载波电话设备等.高12路自70年代初投入使用以来,已在全国广泛推广应用,到目前为止,大约有一千多套高12路服务于通信事业,通信距离最长的约1100多公里.超24路自1978年研制,1979年进行线路试验,1982年投入正式使用,通信距离最长的约670余公里.超12路自1983年研制,1984年进行线路试验,1985年经省级鉴定,现已投入批量生产.上述高频载波电话设备,对节省线路投
The so-called “open-line high-frequency carrier telephone equipment” refers to the carrier frequency of 150kHz above the transmission of telephone equipment, such as high 12 Road, Super 24 and Super 12 carrier telephone equipment, etc. High 12 Road since the early 70s has been put into use, Extensively applied in the country, so far, there are about a thousand sets of 12 high service in the telecommunications industry, the longest communication distance of about 1100 kilometers.Extra 24 developed since 1978, 1979 line test, 1982 Put into official use, the longest communication distance of about 670 kilometers. Super 12 Road since 1983, developed in 1984, line test in 1985 by the provincial appraisal, has now been put into mass production. The above high-frequency carrier phone equipment, save Line cast