Just a heads up that I no longer need help with this.
I upgraded my modem from Motorola Surfboard 5150U to a Motorola MB7420. I ended up going down to the Comcast/Xfinity location a town over and explained that my private modem was flagged obsolete and that I couldnt get to the information page because I didnt know my logon credentials since I havent had a need to use their e-mail etc. The guy behind the counter was really cool about this. He said kind of under his breath yeah you can buy a $50 modem or pay $6 a month and lots of people are buying their own to save money. I then responded that owning my own I saved about $450 over the last 7 years. I said they really should go back to the $3 a month lease fee because at that cost it might be worth while to lease because for $36 a year it would be worth the cost of $3 a month to not have to worry about replacing a modem if struck by lightning or it dies for some other reason.
I got this modem here for $69.99 on sale and then I was offered a 2-year extended warranty for $7.99. So I did the quick math and decided sure. I am still saving money this way and for 2-years BestBuy will have to replace it if it dies for any reason. So $77.98 for 2 years guaranteed, whereas 2 years guaranteed from Comcast/Xfinity would be $144 at 24 months X $6.00 a month. So I save $66.02 and for every month after the 24th month I save an additional $6.00 a month.
http://www.bestbuy.com/site/motorola-docsis-3-0-cable-modem-gray/5050001.p?skuId=5050001&extStoreId=&ref=212&loc=DICAT&ksid=6e412709-a31e-41e9-9153-7879a9c044e6&ksprof_id=3&ksaffcode=pg255266&ksdevice=c&lsft=ref:212,loc:2&gclid=EAIaIQobChMI9bXP8sG91QIVkDyBCh3ARgM8EAQYAiABEgI4ofD_BwEThe modem that the tech suggested to me originally was a $49.99 modem, but it didnt have as many channels and it bottlenecked at a lower speed. I figured it was best to spend just a little more in hopes that a higher bandwidth ceiling would mean I can stick with it a little longer than going as cheap as I can. Additionally I have trust in the Motorola Brand, and this other brand Arris I never heard of before which is this one here which is the exact model the cable company tech suggested:
http://www.bestbuy.com/site/arris-surfboard-docsis-3-0-cable-modem-silver/7534146.p?skuId=7534146He pretty much said that any DOCSIS 3.0 or higher Broadband Modem will work, most will have on them the Xfinity name etc to show that they support specific ISPs etc.
Sadly the local site for Comcast/Xfinity wasnt able to reset my password for my logon. I had to do this from home over the phone with tech support and have a computer handy to type in a security code to get to the screen to reset my password. But when I had the girl on the line helping me with this password reset, I also had her take the MAC address for the new modem and model number and when the telephone went dead, I knew that all I needed to do was swap over the modem, and then wait for them to flash it and then it go through a reboot, then turn my router on and then everything was back up and running again.
The nice thing also is that the girl at BestBuy who asked if I needed help and I was looking between the Motorola and Netgear Modems to decide which one to go with said you might find that you connect at a faster than advertised speed once you switch from your older DOCSIS 2.0 to DOCSIS 3.0 modem. She suggested the Motorola over the Netgear saying the Motorola was better which looking at the specs it was slightly better so it wasnt just a sales pitch to get me to spend more money. I thought it was uneducated info in the getting a faster speed than what my ISP advertises for my internet service. I figured it was a sales person who was pitching the line to make the sale, but surprisingly she was correct. My speed before modem upgrade was
7/1 and now its
12/2 mbps download/upload speed. So this made my day to get more bandwidth and not have to pay any more for my service to get that better bandwidth.
Now to decide if I am going to sell my old modem on ebay or not. There is a flood of them out there. I have 2 of them a Surfboard 5150 and a 5150U, one of them was a spare I picked up for free which works. But thinking it might be more of a headache if I did sell them to someone who doesnt know the difference between DOCSIS 2.0 and 3.0 and wants a refund when their ISP is only using 3.0 now etc.
thinking they are probably pretty worthless and unable to be used together to form a coax network bridge etc like copperlink modems. Not quite sure what hardware is needed to simulate a broadband connection to make a private broadband network bridge etc.
Here is the Netgear that I was comparing the Motorola to:
http://www.bestbuy.com/site/netgear-docsis-3-0-cable-modem-black/6794125.p?skuId=6794125