Modem Speed Test - Check Your Internet Connection Speed
If you are not getting your subscribed Internet speed, there may be several issues at fault. Here are some things you can try before calling your cable provider. First and foremost, when running a speed test, make sure only the cable modem is connected and disconnect any router. Running a speed test on a modem with a router connected will not give you an accurate reading. Since the routers job is splitting the speed and signal to multiple devices, a true speed test result will not be given.
Once you've completed these steps, you can run a speed test to be sure you are getting the proper speeds you are subscribed to. If this does not give a close result to your subscribed speed, the modem itself may be to blame. Run Speed Test Now
Of course, this is a general guideline. Each cable Internet provider has it's own requirements and only allows certain modems to be used on their networks. You can find compatible modems for your ISP here. Please note "At least" noted above. You can buy a cable modem that has more download channels than you need. In fact, we recommend doing so. That way if you up your internet speed, than you won't have to buy a new modem. Or your provider may up your speeds for free, like Comcast just did. Yes, it does happen.
Also, see that anything over 500 Mbps requires a DOCSIS 3.1 modem. 3.1 modems are relatively new and are not differentiated by any channel bonding at this time. They are, however, backwards compatible to DOCSIS 3.0 with 32x8 bonded channels. Basically, overall if you do not have the right modem for your selected speed tier, than this is going to hinder speed performance.
Once you have checked for all of these issues and you still are not getting your subscribed speeds, it's time to call your provider.
In short, try these tips before calling your cable provider with Internet speed or latency issues.