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Flibitijibibo
15 pts.
 Cat 6 crossover only getting 100 Mbps?
Cabling, CAT 6, Category 6 cable, gigabit, Gigabit ethernet, Gigabit network adapters, Windows 7
So I'm trying to make a 1000 Mbps connection between two machines with gigabit ethernet ports. Problem is, even with cat 6 cable, my transfer rate is peaking at 12.8 MB/s (should peak at 128, yes?). It says in the connection status on both ends that the speed is 100 Mbps. Is there something I need to do to get the connection at 1000 Mbps?

Software/Hardware used:
Both running Windows 7 Home Premium x64, 1st machine: Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller, 2nd machine: Intel(R) 82566DC Gigabit Network Connection
ASKED: December 16, 2009  5:25 PM
UPDATED: September 11, 2012  4:40 PM
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Answer Wiki:
Mark sure that the computers are both set to 1000 instead of auto. Try using a network switch which has Gig ports on it and see if that helps any. Also make sure that DMA is turned on on both side of the communication. DMA is Direct Memory Access, a protocol used by disk drives to skip the processor in processing I/O operations. If it is not enabled, I have seen problems such as the ones you've described before. Thanks! Ryan
Last Wiki Answer Submitted:  January 7, 2010  5:42 pm  by  Denny Cherry   64,520 pts.
All Answer Wiki Contributors:  Denny Cherry   64,520 pts.
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Found out the problem. Turns out the Marvell Yukon is not actually a gigabit connection, even though it was advertised as such when I bought it. Tested it with another system that actually had gigabit, and all was well when I edited the necessary driver properties.

Thanks for the help, good sir.

Flibitijibibo
 15 pts.
 

Make sure the you are following 1 Giga Speed cross cable color coding as there is a difference in Cat 5 & 6 color coding, the below coding is for cat 6 starting from pin 1 to 8

Cat 6 Coding

End A End B
White – Orange White – Green
Orange Green
White – Green White – Orange
Blue Brown
White – Blue White – Brown
Green Orange
White – Brown White – Blue
Brown Blue

Yasir Irfan
 5,395 pts.