【摘 要】
：
称作SPS 300的300 路系统是在增加对称电缆的容量,提高话路密集度中发展起来的.基群或超群可以被直接地组织到长途网络中去的该系统能够在现有的干线上提供相当数量的补充电
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称作SPS 300的300 路系统是在增加对称电缆的容量,提高话路密集度中发展起来的.基群或超群可以被直接地组织到长途网络中去的该系统能够在现有的干线上提供相当数量的补充电路,以把投资缩减到最小.它可借助于一根对称电缆的未被占用的四芯线(或称两个线对)传输300条频带宽度为4千赫的话路,一个线对用于群信号的传输,另一个线对用于业务话路,而两个线对的组合用于增音机的远供电流,安装无须任何平衡测试,甚至不必
The 300-channel system, known as the SPS 300, was developed to increase the capacity and symmetry of symmetrical cables, and the ability of the base or superstructure to be directly organized into long-haul networks can be enhanced over existing trunks A substantial number of complementary circuits are provided to minimize investment and it can transmit 300 channels of 4 kHz bandwidth using unoccupied four-core lines (or two pairs) of a symmetrical cable, One pair is used for the transmission of the group signal and the other pair is used for the speech path of the service. The combination of the two pairs is used for the remote supply current of the repeater. The installation does not need any balance test,
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