Today I installed a new modem, the Netgear CM500. Internet works, but the upstream light is constantly amber, and I can notice trouble when multiuple people are trying to access an upstream-- it just takes too long to load webpages. For some reason, there is only one upstream channel. I have no clue how to fix this and have not encountered this problem anywehre else on the internet. (this is a 4x16 router so I should have 4 upstreams... I don't understand why only one is showing up)
Your upstream level is too high (ideal is ~45dBmV). You aren't getting a good enough connection upstream, so your modem has defaulted to a single channel. Usually, this is caused by too many splitters or bad/substandard wiring. It's possible it is a Comcast issue, but most likely the problem exists between the tap (pole) and your modem.
See the troubleshooting guide.
Ok, but we don't have any splitters in our house, it's a very small condo. Do you think I should give Comcast a call?
Hello, I would like to look into this for you from here. To protect the privacy of your account, can you provide your full name, and the full account number or phone number associated with your services. To send a private message click on my name, then click private message me.