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Very Slow Download/Upload Speed-- Gigibit Internet

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Very Slow Download/Upload Speed-- Gigibit Internet

I have had comcast for 2 years and in the last few weeks, the internet has been extremely slow. I have had 150 blast speed, and was only getting 20mbps. I upgraded 2 weeks ago to the 1gig/s speed (gigibit) and I am still only getting 100mbps speeds. I have checked everything, and spent an hour on the phone with comcast resetting my modem and router. Nothing has solved the problem. It is a brand new personally purcahsed netgear docsis 3.1 modem and I had the same issue with the old modem with the slower 150 blast service, so it cant be the modems.  I am attaching a pic of the modems stats.

Could it be a cable line issue?

 

https://imgur.com/aAOT2q8

https://imgur.com/MC2BhDM

 

 

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Re: Very Slow Download/Upload Speed-- Gigibit Internet


@tokyov wrote:

I have had comcast for 2 years and in the last few weeks, the internet has been extremely slow. I have had 150 blast speed, and was only getting 20mbps. I upgraded 2 weeks ago to the 1gig/s speed (gigibit) and I am still only getting 100mbps speeds. I have checked everything, and spent an hour on the phone with comcast resetting my modem and router. Nothing has solved the problem. It is a brand new personally purcahsed netgear docsis 3.1 modem and I had the same issue with the old modem with the slower 150 blast service, so it cant be the modems.  I am attaching a pic of the modems stats.

Could it be a cable line issue?

 

https://imgur.com/aAOT2q8

https://imgur.com/MC2BhDM

 

 


Did you see this?

https://forums.xfinity.com/t5/Your-Home-Network/Troubleshooting-Gigabit-internet-speeds/m-p/3145413#...


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Expert

Re: Very Slow Download/Upload Speed-- Gigibit Internet

The SNR is too low / out of spec on many of the downstream channels. Seem that you have a noisy line / connection quality issue. Try some of this stuff and see if any of it applies;

 

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.



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