发明名称 |
Circuit arrangement for additional data transmission via a two-wire subscriber connection line |
摘要 |
The simultaneous use of a subscriber connection line for the transmission of telephony and data signals is made possible by transmitting the data signals with the aid of a carrier frequency outside the speech band. This prevents the subscriber from being engaged in the incoming direction during a data transmission, for example in the context of the videotex service.
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申请公布号 |
DE3238087(A1) |
申请公布日期 |
1984.04.19 |
申请号 |
DE19823238087 |
申请日期 |
1982.10.14 |
申请人 |
TELEFONBAU UND NORMALZEIT GMBH |
发明人 |
RICHTER,REINHARD,ING.;ZIER,HARTMUT,ING. |
分类号 |
H04M11/06;(IPC1-7):H04M11/06;H04N1/00 |
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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