一带二多功能同线电话保密器

• 作 者: 徐钢
• 机 构: 天津市市内电话局
• 出 处: 天津通信技术
• 发表日期: 1995年02期
• 关键词: 市内电话局 供电情况 接线盒 负载电阻 摘机 叉簧 双极性 发光二极管 振铃 主叫

一带二多功能同线电话保密器天津市市内电话局徐钢一带二多功能同线电话保密器是一种能在一对电话线上并接两部或两部以上话机、通话时相互保密，又能通过监视线路供电情况而判断通路是否正常的一种电子装置，一般放在话机接线盒中。现将我局试制的同线电话保密器介绍如下...

A belt along with two multi-function telephone confidentiality Tianjin Municipality Telephone Bureau Xu Gang area two multi-function with the same telephone confidentiality is a pair of phone lines and then connect two or more than two phones, call each other confidential , But also by monitoring the power supply line to determine the normal way of an electronic device, usually on the phone junction box. Now the Bureau of trial production of the same telephone security device introduced as follows ...