发明名称 |
Private telephone network pass band filter telephone network connection having pass band /isolation sections with high installation impedance handset replaced mode allowing ringing tone passage. |
摘要 |
The narrow band terminal filtering network connects narrow band and wide band telephone networks. The filter has a pass band section (F) and an isolation circuit (I) providing a high input impedance producing installation isolation whilst the narrow band terminal has its receiver replaced and allowing the ringing tone through.
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申请公布号 |
FR2793369(A1) |
申请公布日期 |
2000.11.10 |
申请号 |
FR19990005202 |
申请日期 |
1999.04.23 |
申请人 |
FRANCE TELECOM |
发明人 |
RAHYER ALAIN;BENCIVENGO ALAIN;DUREL VINCENT |
分类号 |
H04L25/02;H04L25/12;H04M11/06;(IPC1-7):H04M1/76;H03H7/00;H04Q5/02 |
主分类号 |
H04L25/02 |
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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