Why Is Upstream Speed Slow With Cox?


A slow upstream speed limits your Internet activities. It prevents you from uploading files, making Internet calls, and sending emails. Cox offers a variety of support resources to help you solve Internet speed issues; by taking steps to optimize your network, you can boost upstream speed and eliminate the need for service calls.

Checking Internet Speed

  • When you are experiencing trouble with your upstream speed, Cox recommends that you use their Internet Speed Check tool or a website like speedtest.net. If your upload speed results are close to the speed cap for your Cox package, you cannot do much to improve the upload speed, short of upgrading. Results that are significantly lower than your speed cap, however, can indicate a problem with your settings, equipment or environment. Speed limits for each region are published on the Cox website; see the Resources section below.


  • The modem you use can cause problems with slow speeds, as some modems are not compatible with Cox Internet packages. Cox recommends that you check their list of approved routers if your upload speed is not reflecting the network caps. If your modem is on the list, check for damaged cable connections, overheating or constant restarting that may indicate physical problems.


  • According to Cox, the connection between your modem and router affects the way the Internet performs. Slow upload speeds can result from a router that is not optimized for Cox service. For best performance, the company recommends that you use a router that has 100 Base T support; look for a label on the router packaging. Without it, the connection between router and modem can become the slowest part of the network, causing a bottleneck that limits speed.

Wireless Interference

  • Wireless interference can inhibit your upstream speed. Although it will also affect download speed, it may not be as noticeable because upload speeds are generally lower to begin with. Most buildings have many sources of interference: brick walls, cement, large aquariums and metal objects like refrigerators are among the most common. Household devices like microwaves and cordless phones can also inhibit the signal. Moving the router closer to computers and at least six feet from problematic devices or materials can resolve the issue.

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