Auto-negotiation
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Auto-negotiation
The Auto-negotiation function automatically configures the Ethernet interface
parameters to establish an optimal Ethernet link based on the capabilities of the
near-end and far-end Ethernet interfaces.
Auto-negotiation for twisted-pair systems, defined in Clause 28 of the Standard
802.3-2002, has been extended to include all three speeds of Ethernet that are
supported over twisted-pair cable: 10Mbit/s 10Base-T, 100Mbit/s 100Base- TX, and
1000 Mbit/s 1000Base-T.
The physical signaling portion of all three twisted-pair systems use the same
Auto-negotiation signaling standard. While Auto-negotiation can be disabled on
10Base-T and 100Base-TX links, it is required on 1000- Base-T systems since Gigabit
Ethernet systems use Auto-negotiation to establish the master-slave signal timing
control that is required to make the link operational. For more information about the
master-slave mode, please refer the Metropolis
®
AMU User Operations Guide.
To be able to override the Auto-negotiation function, it is possible to disable
Auto-negotiation. This might be needed if Auto-negotiation cannot establish a link or if
a specific link speed / mode is required.
Features
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365-312-847R4.0
Issue 4, November 2006
Lucent Technologies - Proprietary
See notice on first page
3-21