Not getting gigabit speeds when I should be...

My setup is like this. On the first floor, I have my DSL modem and my Airport Extreme. I have 2 computers hooked up, one with a gigabit card and the other with an older 10/100 card. I also have a piece of Cat6 cable running through the wall to the upstairs where it plugs into a netgear gigabit switch. This then feeds my MacBook, printer and AppleTV.
The problem is that I get gigabit speeds between devices connected to the netgear, and I get gigabit speeds directly off the Airport Extreme, but I'm only getting 100Mbps from the cable that comes upstairs. The cable is less than 50ft.
I wired the cable myself, so I'm not ruling out error on my part, however I've made other cables from the same spool of Cat6 and using the same RJ45 connectors and get gigabit speeds. Does anyone have any ideas?

I would not waste time trying to conform to Category 6. Until 10 Gb/s devices become commonplace I'm not going to think about it, and then you'll need 6a anyway. Category 5e is sufficient for Gigabit.
The TIA specification is hundreds of pages long and the links I had no longer work. For most do-it-yourself purposes a few key items to watch out for are:
No cheap cables. Proper cable will be marked tested to 350 MHz. Solid cable is better for long lengths, stranded is better for shorter lengths. Use shielded cable in the presence of strong magnetic fields.
Use the proper plugs and jacks rated for Category 5e. There are differences between plugs for stranded vs. solid cable and they're not interchangeable.
No more than 1/2" of untwisted cable. Fabricating ends that conform to this limitation is tedious.
Minimum 5 inch bend radius. Too small a radius will cause crosstalk.
Obviously all eight conductors must be intact for Gigabit. Pins 4,5,7, and 8 are not used for 100 Base-T. If one or more aren't properly terminated your connection will work but its speed will revert to 100 Mb/s.

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