D-Link DFE-650TX Product Manual - Page 6
recognized by the DFE-650's autonegotiation facility, and the DFE
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DFE-650 Series Fast Ethernet PC Card User's Guide not.) The parameters to be negotiated between the DFE-650 and its supporting hub or switch include speed (100Mbps = Fast Ethernet, or 10Mbps = traditional Ethernet) and duplex mode (half-duplex or full-duplex). Startup communication between the two devices occurs when both devices are operating, the cable connection between them is good, and the connected notebook PC's network software is loaded. As soon as those conditions are satisfied, the preparatory process of autonegotiation between the DFE-650 and its supporting device begins and proceeds automatically. If the supporting hub or switch has autonegotiation functionality, then it and the DFE-650 exchange a series of messages in which each device signals its capabilities and listens for corresponding information about the other. The autonegotiation process requires only a few milliseconds, and the two devices select the best communication parameters supported by both devices. If the supporting device does not have autonegotiation functionality, then its monotone (single capability) message will be recognized by the DFE-650's autonegotiation facility, and the DFE650 will simply switch to the one of its own capabilities which matches that of the supporting device. Once the autonegotiation is completed, then the line is ready, and it will provide an optimal data channel between the DFE-650 and the supporting device. The line will remain ready without further autonegotiation action until the linkage is broken. Autonegotiation then reoccurs at any time that the linkage is restored, again making the line ready for optimal data communications. 4 Introduction
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