I recently upgraded to Comcast's 250Mb/s service. The modem I had at the time (Cisco DPC3008) is rated to support speeds up to 320Mb/s, so I expected it to work. My results were around 100Mb/s, and Comcast sent an email saying my equipment needed to be upgraded to support the new, higher speed.
From the Comcast compatibility page, I selected the Linksys CM3016. It's rated to support a maximum speed of 686Mb/s, so I expected it would run at 250Mb/s with no issue. I saw very little improvement, maybe speeds up to 125Mb/s, still only half of what my plan called for.
I spent an agonizing hour or so on the phone with tech support as they 'adjusted' my signal. When they were done, my speed had dropped back BELOW my previous plan (18Mb/s). They finally got the speed back up to ~120Mb/s, then told me my modem was defective.
I tested my speeds during the night - at 2am my speed was 228Mb/s, but by 5am that had dropped off to less than 150Mb/s, and by 8am, my speeds were back to under 120Mb/s, less than half the quoted speed for the service. That tells me the issue was never my modem, it was Comcast network congestion. Instead of admitting that, Comcast pointed the finger at customer-owned equipment and hoped I'd never figure it out.
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I can't find a forum dedicated to Comcast Wi-Fi hotspots troubleshooting, so I'm sorry if I'm the wrong place. I've tried for several days to use a Comcast Wi-Fi hotspot near where I work. I connect to the spot (great signal strength, full 54Mb/s speed). When I open a Web browser (Firefox, Chrome or IE), the browser goes to a Comcast sign in page, but nothing on the page ever loads. I stare at a blank Web page until the browser times out and I get a 'page not found' error. I've tried three different browsers, and two different laptops over several days, but have NEVER gotten to a screen where I could enter my Comcast username and password. Any ideas?
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