D-Link dge-530t User Manual page 28

Section 3 - Advanced Features
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 DGE-530T and its
supporting switch proceeds automatically. If the switch has auto-negotiation functionality, it and the DGE-530T 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.
If the switch does not support auto-negotiation, the (single capability) message will be recognized by the DGE-530T auto-negotiation
facility, which will switch to those settings of its own capabilities, which match that of the switch.
Auto-negotiation reoccurs any time the linkage is restored, making the line ready again for optimal data communications.
D-Link DGE-530T User Manual 28