| 发明名称 |
SPEAKING CURRENT SUPPLY AND SUPERVISION SYSTEM |
| 摘要 |
PURPOSE:To enable a simplified control by supplying automatically subscriber speaking current and PNPN element holding current in subscriber line side, and by performing the current supervision for the subscriber lines, restoring control of PNPN element, and sending of high level signal in trunk side. |
| 申请公布号 |
JPS5267504(A) |
申请公布日期 |
1977.06.04 |
| 申请号 |
JP19750142403 |
申请日期 |
1975.12.02 |
| 申请人 |
OKI DENKI KOGYO KK;NIPPON DENSHIN DENWA KOSHA |
发明人 |
ITOU NOBORU;AKIYAMA NOBUYOSHI |
| 分类号 |
H04M3/02;H04M19/00;H04Q3/52;H04Q3/72 |
主分类号 |
H04M3/02 |
| 代理机构 |
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