| [Speed] Comcast performance speeds fluctuate I recently signed up for Comcast's Performance package (20mbps down). I've noticed extreme fluctuations in the internet speed. I've run a speed test at which it scored about 18mbps down, and then a minute later it scored 3mbps. It seems to be all over the place. One consistent thing I've noticed though is that whenever downloading large files (over 100mb) I always get 10-20mbps, but as soon as I'm done downloading, it's back down to 3-5mbps. Any ideas on how this can be fixed, or is this just how it is with Comcast? |
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| »Comcast High Speed Internet FAQ »How To Get Help!
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»www.VAJeeps.com |
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| MORE INFO:
I'm in Provo, Utah. The speed fluctuations happen all day. I have a Motorola SB5101 modem with firmware version SB5101-2.7.8.0-GA-00-NOSH. I thought the issue may be my Cisco router at first, but I am plugged directly into my modem and still experience the speed problems. I'm running AVG 2012 (newest version). I have tested and found the problem on my Windows 7 PC and my Android phone, using both Firefox and Chrome browsers.
I'm subscribed to the Comcast Performance 20mbps down/4mbps up connection. |
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| post your modem signals too
and I am pretty sure performance is 15/2
unless your area is different |
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| Modem signals:
Frequency 555000000 Hz
Signal To Noise Ratio 38.9 dB
Power Level 8.8 dBmV
Channel ID 11
Frequency 28000000 Hz
Power 47.2 dBmV
I got an upgrade to 20mbps, and I do reach those speeds every once in a while, it's just very inconsistent. |
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| 20 probably includes PowerBoost. You need to provide all the info requested above so we can help you. Speed tests and all.
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»www.VAJeeps.com |
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| Here are some speed tests I ran yesterday on speedtest.net:
I'll just list the download speed, because the upload speed always stayed about the same (around 4mb/s) and ping was always around 45 ms
1. 15.32mb/s
2. 10.11 mb/s
3. 15.24 mb/s
4. 4.33 mb/s
5. 3.81 mb/s
6. 18.73 mb/s
7. 22.42 mb/s
8. 7.91 mb/s
This was all within an hour time period, and the speed fluctuates like this pretty much all throughout the day. I realize that it would be unreasonable to expect a constant 20mb/s as Comcast advertises, but I would think I should be getting pretty constant averages over 10mb/s. I contacted Comcast and the service rep just told me to reset my modem, which of course did not fix the problem. Any help here would be great. |
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| DiffProbe release. January 2012. Build 1008.
Shaper Detection Module.
Connected to server 38.107.216.19.
Estimating capacity:
Upstream: 1364 Kbps.
Downstream: 5464 Kbps.
The measurement will take upto 2.5 minutes. Please wait.
Checking for traffic shapers:
Upstream: No shaper detected.
Median received rate: 1344 Kbps.
Downstream: No shaper detected.
Median received rate: 5338 Kbps.
For more information, visit: »www.cc.gatech.edu/~partha/diffprobe |
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| Time to call Comcast. |
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| I was afraid of that. Any idea of what's causing the problem? |
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| Faulty modem, some type of noise issue possibly... Speaking of modems, which one do you have ?
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»www.VAJeeps.com |
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| I've got the SB5101. It's on rental from Comcast. |
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| Just go trade it in for a newer model modem. I did and all is good. |
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| reply to tmac
Yeah, you need a newer modem.
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»www.VAJeeps.com |
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| I'm thinking about just returning the rental modem and buying my own. Any recommendations for a good one for the service I have (20mbps down/4mbps up)?
Also, has anyone had any experience returning a Comcast rental modem? I'm hoping they will just take it and take off the $7/month I'm paying to rent it, but I'm worried that it may have been part of my contract, and I may be forced to rent it until my contract is up (in a year). |
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