HomerJSimpson's profile

Contributor

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54 Messages

Thu, Dec 24, 2020 12:00 PM

Internet speeds dropped from ~230Mbps to 94Mbps

Don't know when it happened. Been a few weeks since I ran a speed test. Located in Maryland.

 

Rebooted modem, rebooted router. Checked the modem signals which I have attached.https://imgur.com/a/Ld19fWK 

Responses

EG

Expert

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87.1K Messages

6 m ago

The upstream power is too high / out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

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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Contributor

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54 Messages

6 m ago

Appreciate the advice but nothing has changed in at least 5+ years. There are no additional splitters. There's one Comcast splitter that connects every line in the house and only the modem line is in use because we only have internet.   I don't have records of the previous modem levels so I can't compare to anything else. Not having any issues with disconnects or dropped packets. Everything is smooth as can be except we're just not getting the service level we normally do.

MVV331

Frequent Visitor

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13 Messages

6 m ago

same as me and nothing has changed in the last 5 years for me either. It is definitely comcast. I have friends who live around me all experiencing this.  This is not good during this time of all times.  The service went bad tonight of all nights and you can see multiple posts on this forum for around the same time at night.

EG

Expert

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87.1K Messages

6 m ago


@HomerJSimpson wrote:

Appreciate the advice but nothing has changed in at least 5+ years. There are no additional splitters. There's one Comcast splitter that connects every line in the house and only the modem line is in use because we only have internet.   I don't have records of the previous modem levels so I can't compare to anything else. Not having any issues with disconnects or dropped packets. Everything is smooth as can be except we're just not getting the service level we normally do.


Please re-read the first sentence of my reply. The power level figures don't lie. It may or may not be the direct cause of the issue but it should be addressed regardless. Out of spec levels can cause speed problems. 

 

If there is nothing else that you can do, then it may be best to get a tech out to investigate as I also stated. Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !

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Contributor

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54 Messages

6 m ago

Unless their splitter went bad I'm guessing the issue is at the street. I don't have previous levels to compare it to so I can't say if these numbers are normal or not. Given the number of people I've seen complaining about speeds dropping over the last 2 days I'm guessing my issue isn't isolated.

EG

Expert

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87.1K Messages

6 m ago


@HomerJSimpson wrote:

Unless their splitter went bad I'm guessing the issue is at the street. I don't have previous levels to compare it to so I can't say if these numbers are normal or not.

 

There is no need to compare anything. Again. The upstream power is out of spec. It is NOT "normal"

 

Given the number of people I've seen complaining about speeds dropping over the last 2 days I'm guessing my issue isn't isolated.

 

Not everyone's issue is global..... Power problems are quite local to the individual connection.


 

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I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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Contributor

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54 Messages

6 m ago

Issue is fixed at least for now. Rebooted the modem 3 times and the third time the speed went back to 250Mbps. Didn't change anything, levels are the same.

EG

Expert

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87.1K Messages

6 m ago

FWIW, if the upstream power is still above 51 dB, it is a problem that will continue or just waiting to happen. Good luck !

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!tick

Official Employee

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2.5K Messages

6 m ago

Hi there, HomerJSimpson. Let me know if after keeping an eye on things, you'd like to get a technician out. Happy New Year!

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