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.
