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1958年荷兰对其国内载波电话所用纸绝缘的对称电缆所进行的试验证明,这种电缆所能适用的传输频率,至少可达500千赫.荷兰邮电部随即作出决定,将过去传输48路载波体系的对称电缆,改用于120路载波体系.飞利浦电信设备制造公司与荷兰邮电部相配合,为适应这种需要,乃设计了一种新线路设备.这种设备采用晶体管,并由装在地下人孔里面通过电缆供电的简化增音机合组而成.本文除阐明其有关线路设备的各项设计问题外,并对其在实验电路上所测得的主要结果作了讨论.
Tests carried out by the Netherlands on paper-insulated symmetrical cables for domestic carrier phones in 1958 proved that the transmission frequency of such cables was at least as high as 500 kHz. The Dutch Ministry of Post and Telecommunication then made a decision to transmit the 48-channel carrier System symmetrical cable, switched to carrier system 120. Philips telecom equipment manufacturing company with the Netherlands Ministry of Posts and Telecommunications to meet this need, is the design of a new line equipment.This device uses transistors, and installed in the Underground manhole which is simplified by a cable power amplifier.This article in addition to clarify its design problems on the line equipment, and its main results measured in the experimental circuit are discussed.