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[LA] Cable modem and wireless router

Can a certain wireless router channel interfere with a cable modem?


Phoenix, AZ
no it should not if the router and modem are working correctly

Omaha, NE
reply to JeffinNO
cordless phone maybe

reply to JeffinNO
I haven't seen it myself and I would suspect there are a LOT of wireless routers by cable modems out there.

What I have seen is my KU band HD satellite receiver would go nuts when I first got it. I had it near my high powered Ubiquiti access point(not your run of the mill regular low powered linksys, netgear, etc router). I simply moved the receiver about 5-6 foot away and the problem went away.

If you suspect there is a problem, just turn off the wireless portion of the router or plug in a PC straight to the cable modem and cut the power to the router. Don't forget to power cycle your modem if you are changing devices connected to the cable modem.


Phoenix, AZ
reply to JeffinNO
Can it? ... Yes
Should it? ... No

I would say usually if it does, it is probably the connection of the coax to the modem but even then since the wireless signal is 2.4GHz and the cable frequencies top out at 1GHz, it isn't likely but there can be harmonics "created" that cause interference... thinking of how moca can affect some cable channels on the ceton tuners (more prevalent on verizon fios). A "moca" filter might help in this case as it would in theory block the signals above 1Ghz from entering and producing the harmonics, some cable modems now have moca filters built in... Its much more likely that an LTE or other cell phone, or ham radio is interfering.

I one time had a switch that after a year or so the power brick wrecked havoc on systems... primarily it would block caller id functions in my house as well as the neighbor's on both sides as well as producing an audible "click, click, click" ... just by plugging it in and waiting 5 minutes even if it was not attached to a device. I believe it also interfered with some cable channels. My point is that any device however unlikely "can" cause interference to another.

Though it probably isn't your problem, something I thought of in mentioning "power bricks", one mistake I've often seen is people mistakenly switching the power lines between the two devices after unplugging a few times. Usually they are the same connector and often the same voltage but the amperage rating varies. As a result, there isn't enough power to one of the devices.

My signals:

Channel ID 229 230 231 232
Frequency 849000000 Hz 855000000 Hz 861000000 Hz 867000000 Hz
Signal to Noise Ratio 36 dB 36 dB 36 dB 35 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
-1 dBmV -1 dBmV -2 dBmV -2 dBmV

Channel ID 2
Frequency 28050000 Hz
Ranging Service ID 3626
Symbol Rate 2.560 Msym/sec
Power Level 44 dBmV
Upstream Modulation [3] QPSK
[2] 16QAM
[3] 64QAM

Ranging Status Success

Channel ID 229 230 231 232
Total Unerrored Codewords 7952664487 7952664848 7952664589 7952664507
Total Correctable Codewords 26 24 29 25
Total Uncorrectable Codewords 980 611 883 976


Phoenix, AZ
Those signals are near perfect (though many prefer slightly higher s/n but 36 lately has seemed to be the norm and the spec seems to be 35 and above) and your amount of errors are much better than most since its about 99.99999% reliable.

So why are you asking about possible wireless router interference with a modem?