Modem signal levels

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I've Been Here Awhile
Posts: 4

Re: Modem signal levels

Thanks Gdkitty for the response. That's what I thought, the signals don't seem too bad. Speeds are fine.

 

I've tried to update the DNS servers to Google's DNS and Open DNS, but the connection stops working completely whenever I change the setting to manual and enter the new server information. Seems like there is a bug in the firmware? Anyone know if this is a known issue?

 

The sporadic dns behaviour doesn't seem as bad today, but pages do still feel like they are taking longer to resolve than they should.

 

Thanks again.

 

Resident Expert
Resident Expert
Posts: 13,944

Re: Modem signal levels

So your trying to change the DNS on the router side?

Never done that myself..

I run the google DNS, but i set it on a device by device bassis.

You could try setting it on the specific device itself, see if that makes a difference?



I've Been Here Awhile
Posts: 4

Re: Modem signal levels

Yeah, I have tried changing it on the router side but it causes the Internet to completely stop working.

 

I've set the DNS on my devices to Google and it seems to have helped a bit. Still seeing slow page loading but it's tolerable.

I've Been Here Awhile
Posts: 4

Re: Modem signal levels

I've been having this issue with my CGN3ACSMR

 

I've been experiencing this problem with my internet. It disconnects constantly and can never go a day without disconnecting, sometimes it stays disconnected and doesn't come back up. I've tried alot of things (replaced the surge protector, plugged router directly into the wall, thought maybe it's a wifi problem but same thing with a wired connection aswell, I've also hooked it up in Bridge mode and connected it through a R7000 modem) but still no luck, keeps disconnecting. Decided that I need some help from the community in figuring this out as it's very frustrating.

Here's what DOCWAN says:

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1645000000256QAM5.70010536.387
2591000000256QAM6.3009736.610
3597000000256QAM6.1009836.387
4603000000256QAM6.4009936.387
5609000000256QAM6.70010036.610
6615000000256QAM6.60010136.387
7621000000256QAM6.30010236.387
8633000000256QAM7.30010336.387
9639000000256QAM6.80010436.387
10651000000256QAM6.80010636.387
11657000000256QAM6.50010735.780
12663000000256QAM5.80010835.595
13669000000256QAM6.10010935.595
14675000000256QAM6.10011035.595
15681000000256QAM6.20011136.610
16687000000256QAM7.40011236.610
17693000000256QAM7.50011336.387
18699000000256QAM7.50011436.610
19705000000256QAM7.50011536.610
20711000000256QAM7.20011636.387
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandWidth
138596000ATDMA - 64QAM35.18053200000
223700000ATDMA - 64QAM33.75076400000
330596000ATDMA - 64QAM33.75066400000
Resident Expert
Resident Expert
Posts: 6,141

Re: Modem signal levels

Your downstream signal levels are high, signal to noise is good.  The upstream signal levels are low.  Usually the downstream is at or around 0 dBmV with a signal to noise ratio in the 36 to 40 dB range, and the upstream is in the 36 to 40 dBmV range.  Are you in an apartment, condo, highrise, etc, etc, by any chance?



I've Been Here Awhile
Posts: 4

Re: Modem signal levels

I'm in a detached house, using a wired connection going down to a basement.

Resident Expert
Resident Expert
Posts: 6,141

Re: Modem signal levels

1.  Are you running more than one Rogers device, ie, Internet modem, Cable Box, Home Phone?

 

2.  Can you check where the cable enters the house and see if there is a "powered" inline amplifier installed that connects to all of the other devices.  If there is one, that would explain the high downstream levels.  The old style amps amplify everything and cause packet loss.  The new amps have a non-amped port which is used for VOIP devices and the Internet modem.

 

Edit:  If there is no power brick attached, you would have a non-powered multi-port splitter if there is more than one Rogers box in the house.  That would drop the power levels for every attached device, and if that is what you have, its interesting that your power levels are still as high as they are.



I've Been Here Awhile
Posts: 4

Re: Modem signal levels

Thank you, I didn't know that and will go home and check out on that.

I have the Internet modem, then through that I have vonage, android streaming box, chromecast, cellphones, etc. So everything is connected through the rogers router.
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I've Been Here Awhile
Posts: 4

Re: Modem signal levels

Actually signal level should be as follows

TX :35 to 51dBmV 

RX: -10 to 10

SNR: over 25

 

You can pull these from your modem web page under Status | DOCSIS WAN and use attenuators to adjust the numbers