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8-12 Mbps download speed (on 100 Mbps plan) but upload is fine at 10Mbps

X
The Many
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Hi everyone,

After several hours on the phone with my ISP, they told me several times that everything on their end is fine, that I need to contact the modem manufacturer for further guidance. 

My internet plan is 100 Mbps download/ 10 Mbps upload.  For several months now my download speed has been hovering around roughly 10, but my upload has been solid at 10+.  If I reboot the modem the download speed will jump to 15 or so but only for 1-2 minutes, then back down into single digits. 

I have this SB8200 modem and a Netgear WNDR4500 router; these speeds are consistent across all my devices, both wi-fi and hard-wired into the router.

For the life of me, I can’t connect to the internet when plugged straight into my modem, but I am able to manually set my IP (like the work around sticky says) and obtain my bonded channel status.  It looks like 5 of them have a SNR/MER below the levels recommended in the FAQ (one of them is 0!), and 6 channels have uncorrectables that are insanely high-- this particular status was obtained only a few hours after rebooting my modem. 

I don’t trust ISP’s in the slightest, and would love to have a tech come out and realize that my coax is damaged somewhere or something like that, but I’d prefer to check with y’all before running the risk of eating the $$$ tech fee. 

Is there any other info I need to provide?  I don’t know what else to try.  Thank you very much!  

 

Bonded Channel Status

 

Best answer by plemans

with the errors it indicates a line issue. 

Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.

If that doesn’t help and you’re still getting the error with the rented modem, they will need to check the lines

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S
Wi-Fi Warriors
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The values of Power/SNR on the downstream and upstream channels are within the range,  but the corrected and uncorrectable's need to be on 0 values wherein it shows all of them are in number values. Contact ISP(Internet Service Provider) to fix the same.

All channels on the downstream need to be locked: channel 22 which is unlocked to be on the locked category.

After making the necessary changes as mentioned above, Run a speed test.net to check the speed again. If still the speed is slow then try the steps below:

  • Swap the ends of the ethernet cable 
  • Try with different ethernet cables (cat 6/7/8)

As you had mentioned no internet after disconnecting from the router, and directly connecting the modem to the computer, do a power cycle on the modem to obtain a proper IP address and check for the internet.

To do a Power Cycle follow the steps below:

  • Unplug the power and co-axial cable
  • Wait for 30 seconds 
  • Plug back the co-axial and then power cable back 
  • Wait for the lights to come back on the modem 

Also, check the below information:

  • Place the gateway in the center of the house
  • Don’t place it  behind any electronics or appliances
  • Don’t keep it too close to cordless phones (landline not cell), baby monitors, or your microwave
  • Make sure it’s not behind a metal or concrete wall as the signal will be facing a hard time to go through them.

If still no internet check if the co-axial cable is properly connected without any loose ends /cuts or damaged cable then reach ISP (Internet Service Provider).

 

 

 

SURFboard Community Moderator Team
X
The Many
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  • x02947The Many
  • Author
  • The Many
  • 1 reply
  • August 8, 2023

Thank you very much for your response!

I contacted my ISP and asked them about the correctable/uncorrectables.  They said it is not their job to fix and that I could pay for a tech visit to troubleshoot on site.  I declined and opted to rent a modem from them for one month to see if the the problem follows modems or not.

I have tried 3 different ethernet cables ( Cat 5e and 6, I don’t have 7 or 8), but the issue has not changed.  I have moved my modem around, and was also able to connect to internet directly after power cycling, with no result.  In the next day or two I will follow the coax through my crawlspace as far as possible to make sure it is not damaged. 

I’ll update when I get the ISP modem and let you know if the issue is resolved or stays the same.  Again, thanks!

plemans
Juggernaut
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  • plemansJuggernaut
  • Juggernaut
  • 2266 replies
  • Answer
  • August 9, 2023

with the errors it indicates a line issue. 

Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.

If that doesn’t help and you’re still getting the error with the rented modem, they will need to check the lines

Current setup: Netgear CM3000-->Netgear RBE973S-->2.5gig tp-link switch, Xfinity 2.4gig/350mbps

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