发明名称 |
Digital line card having universal port for upgrading electronic messaging system |
摘要 |
A digital line card is provided for use in an electronic messaging system for enabling the receipt of voice and text or image data over a single communications port. The digital line card includes a digital signal processing integrated circuit, a microprocessor and a random access memory component for storing coding schemes employed by the digital signal processing integrated circuit. The digital line card is programmed to detect the presence of dual-tone multifrequency command signals in the incoming data stream, and to switch between voice and data processing responsive to the command signals.
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申请公布号 |
US5479498(A) |
申请公布日期 |
1995.12.26 |
申请号 |
US19930076440 |
申请日期 |
1993.06.11 |
申请人 |
OCTEL COMMUNICATIONS CORPORATION |
发明人 |
BRANDMAN, YIGAL;LIN, FRANK C. H.;OLSON, PETER D.;PURI, MANOJ;SUBRAMANIAM, JASON |
分类号 |
H04L27/30;H04Q1/457;(IPC1-7):H04M1/50 |
主分类号 |
H04L27/30 |
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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