I've noticed that people on the forum have mentioned Comcast changing from 64 to 256 QAM. I assume this is some sort of upgrade. How can we tell if this was done in our area? I have been experiencing connection issues recently, and they seem simlar to those of people who have had the QAM change recently.
It has apparently caused a problem with my connection/modem. Any constant-bandwidth programs (like online games) will only stay connected for 1-5 minutes before disconnecting. For several years my connection has been rock solid, and apparently much faster than most people's cable connection (according to the tech support guys in my area), but suddenly in the past couple weeks, this new problem has arisen. It affects all games, and I have tried it with and without my router connected, and on different computers. I believe it might be the modem or my signal. How can I tell?
QAM upgrades will only impact your connection if your SNR is borderline or too low. In other words, QAM 256, is more sensitive to niose than QAM 64. Your best bet is to contact us and have the tech run diagnostics on your line to see if your signal levels look good. We can always send out a tech if needed.
You can check your cable tv stations, channel 2, 3, 4, 5, 6 and 7. If those channels are fuzzy, You definately have a signal issue and need a tech out there to resolve it.
If you are able to, go to you local payment center and swap out the modem, if the problem stops after swapping out the modem, there ya go.
You could also try the following.
Open a command window and run a continues ping to a website then play your game. WHen you experience the latency on the game. Log out and check the ping results and see if it is happening there as well. Not sure if you know how to access a command prompt or run a ping, but my website will help with that. www.shunney.net it will also help with other troubleshooting issues too
I ran the diagnostics and found the following results:
Frequency: 591000000 Hz Locked
Signal to Noise Ratio: 30 dB
Power Level: -2 dBmV
Frequency: 34000000 Hz Ranged
Power Level: 42 dBmV
The item that concerns me is the SNR being 30dB. From what I have read, for QAM 256, the SNR should be 33 dB or higher. Michael, is this accurate? If so, what should I do?