Can't get full speed out of Comcast Blast (16/2) when connected to AEBS

I just moved into to a new townhouse that I had prewired with Cat 6 and have subscribed to Comcast Blast service. (No Fios here.) When I connect my Mac directly to the modem, I can get download speeds as high as 16-17 Mbps and upload speeds around 1.5 Mbps at times. However, when I try to connect through my home network (modem > AEBS > Gbit switch > Mac), I'm lucky to get > 4Mbps down and about 1.5 Mbps up. (Download speed is obviously more of a concern.) The AEBS is running v7.2.1 and I confirmed through Network Utility that I'm connected to my network at 1Gb. Any suggestions?
Thanks in advance,
Paul

Hey Paul:
Okay.
This should NOT be happening. Something is obviously awry here. Try checking the cable that is used to connect your Comcast Modem to your Airport Base Station. It may / may not be the problem. Usually however Comcast does not supply high quality patch cords and they're not anywhere near the cat 5 or 5e spec. Forget about Cat 6 being given away by them.
So go buy a handful of patch cords that are spec'd at cat 6. (And get ready to pay thru the nose for them!) Use these to replace all the connections from the Cable Modem to the AEBS and from the AEBS to your Gigabyte Switch. You can get a reading that says you're connecting at gigabyte speeds but if your cables won't run it, then you do not get the throughput that you're looking for. Remember you are going through multiple ethernet ports here (cable modem to AEBS to Switch to Computers.
Also, do you have your Gigabyte capable devices on the GB switch ONLY? No 10/100 printers or computers with slower ethernet ports connected to THAT switch? I know they say 10/100/1000 but generally that's total BS. You'll find that isolating the slower speed devices/computers onto their own switch/hub makes a huge difference. A NON-Gigabyte ethernet device (just like a non-N Wireless device) mixed into the same network can slow down the who network. The solution is to put the slower stuff on a little 8 port powered 10/100 switch of it's own with a Gigabyte UpStream connection to your GB switch. That way the slower devices don't slow your entire network down to a crawl. Don't forget to use a CAT 6 Cable from the GB Switch to the 10/100 switch with a GB Upstream port. Yes. It matter that much. The faster the network goes the less forgiving it becomes.
Also, you said you had the house wired for CAT 6. Did the installers use CAT 6 certified Jacks, Cable, Connectors? Lots of really lousy electricians will charge you for CAT6 and then use the cheaper connectors and jacks. You've got the right cable. But nothing else. And the whole thing is NOT going to work at the maximum speeds until the hardware is all CAT6 and installed correctly.
I paid over $30k to wire the office for CAT 6 and POE for the phones. The contractor used the cheaper cat 5 jacks and connectors. They didn't even terminate the connectors properly. Cost me a fortune in trouble shooting to find the problem and more money/time to correct it. When I took the first guy to court for breach of contract and fraud he said "I didn't know that CAT6 required special jacks and connectors and cable terminations." The judge agreed with me that as an electrical contractor charging that kind of money - he should have known and supplied what he specified. Not what was handy and cheaper. I got my money back. And court costs. And he got fined an additional $50k for the fraud and misrepresentation. So find out what your contractors actually installed. I'd almost bet that somewhere along the way, you're back to cat 5 or cat 3 and don't even know it.
Good luck!
Isn't data communications FUN?
Let me know what you discover!
M in LA

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