About Autonegotiation
continued
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 auto-negotiation
between the DFE-650TXD and its supporting device
begins and proceeds automatically.
If the supporting switch or hub has autonegotiation functional-
ity, then it and the DFE-650TXD exchange a series of
messages in which each device signals its capabilities and
listens for corresponding information about the other. The
auto-negotiation process requires only a few milliseconds,
and the two devices select the best communication parame-
ters supported by both devices.
If the supporting device does not have autonegotiation func-
tionality, then its monotone (single capability) message will be
recognized by the DFE-650TXD's autonegotiation facility,
and the DFE-650TXD will simply switch to the one of its
own capabilities which matches that of the supporting device.
Once the auto-negotiation is completed, then the line is
ready, and it will provide an optimal data channel between the
DFE-650TXD and the supporting device. The line will
remain ready without further auto-negotiation action until the
linkage is broken. Auto-negotiation then reoccurs at any time
that the linkage is restored, again making the line ready for
optimal data communications.
3
Summary of Contents for DFE-650TXD
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