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一、概述 HZD—1型市话单路用户载波电话设备用于市内自动电话网的用户线,即在每一对音频用户线上增加一个载波电路。载波电话与原有的实线电话互不影响,各自占一个电活号码(即各自占交换机的一个门子)。这样在不增加用户电缆线对的情况下,现存的市内电话的容量可以增加一倍,即市话电缆的线对可以100％地复用。 如果在自动电话局装上足够容量的HZD—1型市话单路用户载波设备,那么提供任何临时性的或永久性的电话设施的问题都可以非常迅速地得到解决,因为HZD—1型的用户机就象普通电话机一样安装简单,不需要任何调整和测试。
I. Overview HZD-1-type single-channel local telephone carrier telephone equipment for the city’s automatic telephone network subscriber line, that is, each pair of audio subscriber line to add a carrier circuit. Carrier phones and the existing real-line phones do not affect each other, each accounting for an e-life number (that is, each occupy a switch gate). In this way, the capacity of the existing local telephone can be doubled without increasing the number of user cable pairs, that is, the line pair of the local cable can be 100% multiplexed. The problem of providing any temporary or permanent telephone facility can be resolved very quickly if the automatic telephone office is equipped with a HZD-1 type single-homed subscriber carrier device of sufficient capacity, since users of the HZD-1 type The machine is as easy to install as an ordinary phone without any adjustment or testing.