D-Link DFE-530TX+ - Manual (Page 10)

DFE-5307X lO/lOOMbps Ethernet Adapter for PC/ Bus
the best data communication scheme which is supported by
both modems, and which is suitable for the quality of the
telephone line linkage between them. The parameters to
be settled between the two modems include best baud rate,
compression method, and error correction method. When
the two modems have tested the phone-line quality and
settled on the combination of shared options and
parameters
which will provide the b e s t d a t a
communication over the connecting phone line, then you
are given the “ onnect” message which signals the end of
the intermodem negotiation and the beginning of your
intended communication with the remote computer.
Auto-negotiation between devices within an Ethernet LAN
is similar in concept, but much briefer. The two devices
involved in the auto-negotiation will be the DFE-530TX
Adapter serving your station (installed in your computer),
and the hub through which it is connected into the LAN.
The options to be negotiated between the DFE-530TX and
its supporting hub include Ethernet type (lOOBASE-TX
Fast Ethernet or lOBASE-T Ethernet) and duplex mode
(half-duplex, being one-way-at-a-time, or full duplex, being
simultaneous transmit-and-receive).
Startup communication between the two devices occurs
when both devices are power-on, the cable connection
between them is good, and the Network Operating System
software is running.
As soon as those conditions are
satisfied, the preparatory process of auto-negotiation
between the DFE-530TX and its supporting hub proceeds
automatically. If the hub has auto-negotiation function-
ality, then it and the DFE-530TX 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,
installation 3