D-Link DFE-538TX Product Manual - Page 7

About Auto-Negotiation - dos

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About Auto-Negotiation You have probably had the experience of making a dialup connection through a modem, and have heard the sound exchange between your modem and the modem at the other end of the telephone line. As irritating as those few seconds of noise may be, they do let you know that your modem and the remote modem are on the job, preparing for your intended communication with the remote computer. When the two modems have tested the phone-line quality and settled on the combination of shared options and parameters which will provide the best data communication over the connecting phone line, then you are given the "connect" 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 DFE538TX Adapter serving your station (installed in your computer), and the switch through which it is connected to the LAN. The options to be negotiated between the DFE-538TX and its supporting switch includes Ethernet type (100BASE-TX Fast Ethernet or 10BASE-T Ethernet) and duplex mode (half-duplex, being oneway-at-a-time, or full duplex, being simultaneous transmit-and receive.) Startup communication between the two devices occurs when both devices are powered up. Once the cable connection and the Network Operating System software is satisfied, the preparatory process of auto-negotiation between the DFE-538TX and its supporting switch proceeds automatically. If the switch has auto-negotiation functionality, it and the DFE-538TX exchange a series of messages, 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 parameters supported by both. 4

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4
About Auto-Negotiation
You have probably had the experience of making a dialup connection through a
modem, and have heard the sound exchange between your modem and the modem
at the other end of the telephone line.
As irritating as those few seconds of noise
may be, they do let you know that your modem and the remote modem are on the
job, preparing for your intended communication with the remote computer.
When the two modems have tested the phone-line quality and settled on the
combination of shared options and parameters which will provide the best data
communication over the connecting phone line, then you are given the “connect”
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-
538TX Adapter serving your station (installed in your computer), and the switch
through which it is connected to the LAN.
The options to be negotiated between
the DFE-538TX and its supporting switch includes Ethernet type (100BASE-TX
Fast Ethernet or 10BASE-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 powered up.
Once the cable connection and the Network Operating
System software is satisfied, the preparatory process of auto-negotiation
between the DFE-538TX and its supporting switch proceeds automatically.
If
the switch has auto-negotiation functionality, it and the DFE-538TX exchange
a series of messages, 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 parameters supported by both.