发明名称 |
Automatic detection of phone system settings for dial-up modem connections |
摘要 |
A method and apparatus for automatically establishing a data connection includes a telephone line interface circuit coupled to a subscriber telephone line, and a modulator and demodulator circuit coupled to the telephone line interface circuit. A control circuit is coupled to the modulator and demodulator circuit and conditions the modulator and demodulator circuit to establish a connection to the subscriber telephone line and comprises circuitry to determine whether a central office to which the subscriber telephone line is connected is a tone-dial central office or a pulse-dial-only central office, whether a dialing prefix is necessary to access the subscriber telephone line, and whether the call waiting feature is activated on the subscriber telephone line.
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申请公布号 |
US6546091(B1) |
申请公布日期 |
2003.04.08 |
申请号 |
US19980143249 |
申请日期 |
1998.08.28 |
申请人 |
THOMSON LICENSING S.A. |
发明人 |
WEHMEYER KEITH REYNOLDS;CRUPI DANIEL ROBERT;MORRISON HUGH BOYD |
分类号 |
H04M1/26;H04M1/30;H04M3/428;H04M11/00;H04M11/06;(IPC1-7):H04M11/00 |
主分类号 |
H04M1/26 |
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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