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Gigabit Ethernet Auto-Negotiation

Overview The Auto-Negotiation standard allows devices based on several Ethernet standards, from 10BaseT to 1000BaseT, to coexist in the network by mitigating the risks of network disruption arising from incompatible technologies. This capability helps ensure a smooth migration path from Ethernet to Fast Ethernet and Gigabit Ethernet. This article provides an in-depth explanation of auto-negotiation and its functioning and also discusses special cases that may be encountered.

Gigabit transceivers at the physical layer (PHY) of the Open Systems Interconnection (OSI) model use auto-negotiation to advertise the following modes of operation: 1000BaseT in full or half duplex, 100BaseTX in full or half duplex, and 10BaseT in full or half duplex. Although auto-negotiation can be disabled for 100BaseTX or 10BaseT connectivity, it is always required for normal 1000BaseT operation.

Further White Paper Details
Publisher	Dell Computer	File Format	HTML & PDF
Date Published	January 2001	Downloads	53
Format	White Papers
Topics	Ethernet, Industry Standard Protocols, Fast Ethernet

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