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What is the Maximum Link Distance for 1000Base-T?


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Article ID: 4875

Standards
802.3ab
1000Base-T

Related to
Ethernet
Gigabit
10/100/1000

Goals
Maximum link distance for 1000Base-T

Symptoms
No link
Gigabit link cannot be established

Solution
The maximum link distance for a full duplex 1000Base-T Gigabit Ethernet link utilizing four pairs of Category 5 UTP cabling is 100 meters.

This distance is stated in the 802.3ab Ratification press release.

Unless all four pairs are utilized for 10/100/1000 port attachment, the peer ports may or may not be able to attain link; and if they attain link, they will likely not be able to reliably pass traffic. This is true of both straight-through and crossover pinouts, at any line speed.

See also: 4593.

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