WiFi less responsive after modem swap

iMas70

macrumors 65816
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Sep 4, 2012
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I decided to buy my own modem so I could stop paying Comcast $10.00 per month to rent theirs. I went with the Motorola ARRIS SB6141. It has a lot of good reviews and was also recommended by the guy at Best Buy. I have this connected to my Airport Extreme and then to my Mac Mini. Speed are pretty much the same. 120-125 Mbps on the Mac Mini. WiFi speed vary. Sometimes they are in the 110-120 Mbps range and other times a little slower. Something that I've been noticing, and it seems to be happening after the modem swap, is sites don't pull up as fast as they used to. I would click on a site before and it would come right up. Now it seems like there is more of a delay. I've even seen a message come up on my phone and iPad that said something like "slow connection". I just did a speed test on my iPhone and iPad as I'm typing this. Speeds are all over the place.

Three tests with the phone ranged from 20-25 Mbps. I did a few more tests with the iPad. Three were only 1-2 Mbps. I restarted it then did it again. That produced one 57, one 96 and one 107 Mbps. Ping Nothing else is on WiFi as I'm doing this. Actually, I just did two more with the phone before I posted this. Both started off slow. I thought they would give me results in the 25-30 range. Then they spiked up to 103-105.

Any ideas?

Thanks!
 

iMas70

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Original poster
Sep 4, 2012
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Going through the router -





And direct from the modem -



 
Last edited:

Weaselboy

Moderator
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Jan 23, 2005
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What I meant was connect directly to the cable modem then do some speeds tests and see if that fixes it.

Your downstream signal levels are good, but that upstream level 56 dBmV is way high and that is likely the problem. That upstream level should be under +49. What happens when that level is so high is the modem will try to reconnect at lower speeds and that causes the log entries and slow speeds you are seeing.

I would have the cable co. come out and check your coax cables and connections out the the street and see if they can fix that upstream signal issue you have.

If you have any splitters between the cable modem and the connection to the house, try removing those.

http://www.dslreports.com/faq/16085
 

iMas70

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Original poster
Sep 4, 2012
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The first set of images were going through the router and the second set was connected directly to the modem. I contacted Motorola. The person I spoke to said the same thing that you did. The upstream level is to high. He also asked if I have a splitter. I don't have one. I called Comcast after that. The person there wasn't to helpful. Didn't seem to have the knowledge that you and the gentleman from Motorola have and though everything was good because my computer is seeing the speeds that it should. I had to remind him that the issue is with my WiFi. After that he said there must be an issue with the router (Airport Extreme). I've used my iPad to do a number of tests in the last hour. Results are in the 42-51 Mbps range. Results last night were from 76-120.

I'm going to call Comcast again. Maybe I can get someone that is more knowledgeable.
 

iMas70

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Original poster
Sep 4, 2012
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I've spent some time on the phone with Comcast. Talked to three different reps. No luck. One suggested that a technical come out to check the connection from the pole to the house and then the wires inside so that is scheduled for later tomorrow afternoon.

There is one other thing that I can think of doing on my end. That is getting another modem that has WiFi to see what my speed is with that. If I see a consistent 100+, then the problem might be my Airport Extreme. If not, then it's a connection issue. It least that will give me a little more to go on. I did at least 15 tests while I was talking to Comcast. These are the results in order -

7 tests in the 37-51 range then
61
66
12
108
25
67
74
55
 

hallux

macrumors 68030
Apr 25, 2012
2,944
592
The problem with your screenshots is that it's showing what the modem is seeing for connection speeds in both captures. Run speed tests on the computer with a LAN cable plugged in directly between the modem and the computer. That will eliminate the Airport in the network and may isolate the issue to your cable connection or your Airport.
 

iMas70

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Original poster
Sep 4, 2012
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I've done that a few times. The second set of images is with the Airport eliminated. Actual speeds on the computer don't change much. Just a few Mbps slower without the router. Those were about 118-122.

I'm pretty good with a lot of this stuff but a little green when it comes to internet testing beyond actual speeds.
 

iMas70

macrumors 65816
Original poster
Sep 4, 2012
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I don't know if this matters or not but I just installed the latest beta software after reading about it on the front page here -

Thus far, OS X 10.10.4 betas have not included outward facing design changes or feature additions, but the last beta introduced a significant behind-the-scenes update that may improve networking performance for users who have experienced issues with OS X Yosemite.

Discoveryd, a somewhat problematic networking process that has been linked to multiple bugs in OS X 10.10, was removed in favor of the older bug-free mDNSresponder.

Now I'm seeing results in the 91-122 Mbps range. That was from close to 40 tests between my iPad and iPhone. The needle sweeps right over past 100 without looking like it's struggling like it used to. Coincidence? Who knows but it's working now!
 
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