| 发明名称 |
INFORMATION SYSTEM OF COMMUNICATION |
| 摘要 |
PURPOSE:To secure information of communication incapability for signal reception from terminal unit and operator when trouble occurs at the center by sending out alternately aural frequency signal and fault signal to the circuit at the time of the circuit reception. |
| 申请公布号 |
JPS5282105(A) |
申请公布日期 |
1977.07.09 |
| 申请号 |
JP19750158976 |
申请日期 |
1975.12.29 |
| 申请人 |
FUJITSU LTD |
发明人 |
FUCHIYAMA MASAKI;ONO SHIYOU |
| 分类号 |
H04M11/06;G06F13/00;H04L12/26;H04L29/14;H04M11/00 |
主分类号 |
H04M11/06 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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