Skip to main content

Picking a Cable Modem for Xfinity

There are a lot of cable modems on the market, and many are compatible with Xfinity service.

However, that doesn't mean that every modem is perfect.

My basic requirements are:

  • Currently certified by my ISP.  Buying a cable modem that isn't currently certified is simply unlikely to work.
  • Capable of supporting needed service speeds.  Buying a cable modem which cannot deliver the service needed is going to be an immediate bottlebeck.  Buying a cable modem which is far more capable that the service speed is likely a waste of money,
  • No built-in WiFi capability or Telephone line capability.  A personally-owned WiFi router is likely a better choice than an all-in-one unit that will need to be positioned exactly where the cable is within the house. 
  • Don't over-buy.  Cable modems do not last forever.  Manufacturers abandon support, and cable modems aren't infinitely durable due to things like lightning strikes and being powered on for years at a time.

So what are the good modems?

Assuming a very high speed plan (more than gigabit), at this point there are only two modems that meet my criteria:

Why?  Because these are the only modems that meet all of my requirements:

  • Appear on Xfinity's NextGen Speed Tier list (as of June 26th)
  • Appear on Xfinity's "Recommended" list (as of June 26th)
  • Have a 2.5 Gbit Ethernet port
  • Do not have WiFi or an "analog" Telephone port

Which one to get?  They all mostly use the same class of chipsets.  I'd get the cheapest. Shop around, as prices change.  Used modems are often good deals, as they are often just store returns that have seen little to no usage.

Slower plans

For slower plans, which is what most people should have, I recommend getting the very cheapest that meets the service plan.  For example, I bought a Arris SB6190 that can be purchased used for about $20. It has been working perfectly for years. 

Other options and ideas

  • If the plan includes a "free modem", consider using it.  Free is a good price, and the free modems are usually good.
  • For a small apartment, an all-in-one modem/wifi router might do the trick.
  • If service has been troublesome, perhaps stick with the leased modem so the provider can't pass the buck when the service isn't working well.
  • When buying, remember that your purchase may not last forever.  
    • The manufacturer may abandon the device
    • The ISP may change their technology, leaving your device obsolete
    • A new service provider may emerge with a better deal
    • You may move and end up with a new ISP
    • Your device might fail due after the warranty expires, or due to an incident 

 

 

 

Labels:

Popular posts from this blog

Fixing a SodaStream Jet, part 1: Disassembly Guide

I've had my SodaStream Jet for years, and once in a while something has gone wrong. Disassembly is the first step to repair.  Start with this article to see how to disassemble the SodaStream, and then once you have that down, scroll through my other articles to see how I repaired specfic SodaStream problems. SodaStream Jet Disassembly Guide Tools Required Flat head screwdriver Phillips head screwdriver 1. Remove the Carbonator.  Duh. 2. Remove the black panel lever The front big black tilt lever needs to be removed first. Removing this panel is tricky, but it isn't impossible. Looking up at the bottom of the black panel, there are two tabs, one on the left and one on the right. These tabs fully secure the panel in place. The trick is to use a flat-head screwdriver under the plastic to gently lever the tabs out of the way.  Note in the pictures how I approach these tabs with my screwdriver.  I usually release the left side first, and then I release ...
Read more

Sodastream Carbonator Leakage, Usage, and Weight

SodaStream 60L "Carbonator" CO2 cylinders have a specific weight when empty, plus about 410 or so grams for the CO2 they should have when they're "full".  A little while ago I went to buy a replacement Carbonator from my local hardware store. The dealer pulled a new Carbonator out of the box and sensed it was lighter than usual.  He put the "light" Carbonator in the "empty" pile and sold me a different one.  At that moment I concluded that it would be smart of me to weigh both new and empty SodaStream carbonators.  Here are the results. Weighing a SodaStream Carbonator - for both Science and Consumer Protection.       The dealer told me that sometimes the carbonators leak after they leave the SodaStream filling facility.  That means there could be an opportunity for customers like me to get ripped off! The SodaStream cylinders I buy claim to have a net product weight of 410 grams - and that means that a full Soda Stream Carbonator shou...
Read more

Robust Installation of an HDHomeRun Networked TV Tuner. 64 OTA channels!

I added an HDHomerun (HDHR) over-the-air (OTA) streaming box to my home network, bringing over-the-air broadcast TV to my computers, phones and tablets.  The HDHR is a big upgrade from my previous setup: using a simple "window mount" antenna directly connected to my TV. A TV-attached antenna is good for watching some TV for free, but the HDHR offers so much more flexibility. Figure 0: HDHomeRun on my basement wall   My original OTA TV setup was haphazard at best. It was finicky, ugly, and hard for other people at home to use. I would actually tape my antenna to a window whenever I wanted to watch OTA TV. Plus, it only worked on my TV and not with my other devices. I wanted a cleaner and more modern OTA setup. After looking at possibilities, I developed two goals: (1) bring my OTA TV into the modern Internet-connected era, and (2) set it up in a reliable and pretty way so that other family members wouldn't have to fool around with the antenna or anything else.  With that,...
Read more

Fixing my Wahl 9918 Groomsman Beard and Mustache Trimmer

Not everyone would bother repairing a $25 beard trimmer, but why not fix something for under $5 instead of spending another $25? My  Wahl 9918 Groomsman Beard and Mustache Trimmer  has admirably performed its beauty duty for many years, but the time came when the battery just wasn't holding a charge any more.  Most people would just put the trimmer in the trash and buy a new one, but I figured I could repair my otherwise excellent Wahl and save some money. In fact, even high priced trimmer and rotary shaver brands, like Norelco and Remington, can be easily repaired using a process similar to the one I used to fix my Wahl.  Read on to find out how. I opened up the Wahl by popping off the black plastic faceplate with a tiny flathead screwdriver, which revealed two screws.  By removing the two screws I was able to easily open up the unit, revealing the guts of the device. Backplate off, Revealing the screws The internals are rather simple: a motor, a...
Read more

Fixing a SodaStream Jet, Repair #2 - Broken Fill Button

My Soda Stream Jet's fill button broke, which means I can not longer carbonate water by pressing the pushbutton. This caused all sorts of grief in my household. Here is how I managed to repair my Jet to give it another 10 years of life (hopefully). First, a look at the button The fill button on the top of the SodaStream is actually a simple lever. Pressing down on the button moves a pin that does the actual work of pressing open the Carbonator's valve. Unfortunately, the axis point is fairly thin and can see a lot of stress. That's where my Soda Stream button cracked. [ I think the usage tip here is "don't over-press the button like a gorilla, it doesn't do anything but put high stress on the button."] Cracked levering point of the button The Pesky Lever Retaining Pin The Fix It was pretty easy for me to replace the button: Take off the back of the Soda Stream and remove the carbonator. Push out the the button lever's steel retaining pin. This takes qu...
Read more

Adding a Water Flood Sensor to my Vista-20p alarm system

My Honeywell Vista 20p alarm system is fairly comprehensive, but I want one more feature: an alarm that lets me know when my sump pump isn't working properly. Here is how I added one for about $8 in special parts.   I'm afraid of a flood in my finished basement. I'm fortunate - my basement sump pump system is already redundant, with two independent pumps and two outflow pipes. The primary pump kicks in when the water level reaches 6 inches, and if that doesn't work, then the backup pump kicks in when the water level reaches 7 inches.  The backup pump should never kick in unless the primary pump is having a problem pumping.   But there is a problem with this setup: I might never know if my primary pump has failed, leaving me with no redundancy.  I want to be informed when I have one (or god forbid, two) pump failures. My goal is to have my Vista 20p alert me when the sump's water level is ever beyond the point where my primary pump should have kicked in, alertin...
Read more

Other Posts

Show more