> 802.3-2008 40.4.4 says: > > > Implementation of an automatic MDI/MDI-X configuration is optional > for 1000BASE-T devices.
Just downloaded 802.3-2012 from the IEEE, In Section3 40.8.2 (p269) explains, or tries to. There is also the pinout for the two Variants, (incompatible to 10/100baseT Xover). So Iff you want to have autoneg OFF, you must use the correct wiring. Switch MDI-X, device MDI, if both are the same you must make use of the magic 1000baseT-crossover Cable at the farest possible end (so at the end-device, not on the switch, not between any patchpanels on the way). If you have autoneg ON, the pairs will be matched, so normally, you can use simple straight patch-cords. Hey, tomorrow I will call my local dealer for an GigabitCrossover Cable. "I need a 5 feet 1000BaseT Crossover Cable Class D (for you: CAT5) according to IEEE Std 802.3-2012 Section Three" He will think I got mad. Or he will tell me: "Well, that's a relative new version of the standard, So those cables are quite expensive, we do not have much on stock her, oops, Currently sold out." Juergen. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
