发明名称 |
High speed modem. |
摘要 |
<p>A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing between lower-speed, interactive operation and higher-speed operation based upon data transmission demands. The operation is controlled by a processor monitoring the contents of a transmit data buffer and providing a mode control command to the modem transmitter. The modem also adapts its speed to the quality of the telephone line by fallback or fallforward to a different speed based upon predetermined data frame retransmission criteria.</p> |
申请公布号 |
EP0260470(A2) |
申请公布日期 |
1988.03.23 |
申请号 |
EP19870112112 |
申请日期 |
1987.08.20 |
申请人 |
RACAL DATA COMMUNICATIONS, INC. |
发明人 |
MAXWELL, RONALD;ZORZI, KARL J.;YOSHIKAWA, HARUNORI (NMI);PRASAD, VENKAT S.(NMI);SMITH, FRED G. |
分类号 |
H04L29/06;H04L1/00;H04L1/18;H04L5/14;H04L5/16;H04L27/00 |
主分类号 |
H04L29/06 |
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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