发明名称 DISCRIMINATOR FOR OUTGOING AND INCOMING CALLS OF CENTRALIZED SERVICE OBSERVATION SYSTEM
摘要 PURPOSE:To make it possible to discriminate between an outgoing call and incoming call by a master-station device, to simplify centralized service observation, and to improve the efficiency of the observation, by discriminating an outgoing or incoming call at a centralized observation branch station and by receiving and displaying the information on it at the master station. CONSTITUTION:Through the off-hook of a subscriber on an observation circuit, the connection operation of the automatic telephone switchboard advances and main link 2 is closed, so that the outgoing-incoming call discriminator will generate signals through the relay operation of observation unit 3. As a result, obervation common control unit 4 sends out outgoing-call information to master-station device 5 via an inter-office junction line and device 5 indicates the originating by lighting up a lamp. In addition, if an incoming call is generated to the observation circuit, unit 4 starts operation via unit 3 and the outgoing-incoming call discriminator before link 2 is held and, conseguently,incoming discrimination information is sent to device 5, so that the lamp will come on.
申请公布号 JPS5455107(A) 申请公布日期 1979.05.02
申请号 JP19770121437 申请日期 1977.10.12
申请人 HITACHI LTD 发明人 NAKAYAMADA MASAYOSHI
分类号 H04M3/36 主分类号 H04M3/36
代理机构 代理人
主权项
地址