Community Forum

Gigabit Packet Loss

Highlighted
Regular Visitor

Gigabit Packet Loss

Been having some packet loss the past week or so and it's really starting to get annoying in my gaming. Valorant is showing constant spikes of packet loss as I'm playing. PingPlotter is showing constant packet loss as well pinging google. Modem stats attached, but seemed fine. Only strange thing to me was that one downstream channel is OFDM PLC while all others are QAM256. I'm not super well versed in this, but I feel like I haven't seen that before. It's also that channel that has corrections so I feel like it's likely to be an area to look into. Called comcast today and everything looked fine from their end since my speed itself is fine... it's just the consistency/reliability of the connection that's an issue. Anything on packetlosstest.com shows terrible results depending on what settings I select... usually 5-15% packet loss and often a lot of late packets.

 

image backup: https://imgur.com/a/FcwUQuq

www.google.com.pngmodem.JPG

Highlighted
Expert

Re: Gigabit Packet Loss

The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

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.



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!
Highlighted
Regular Visitor

Re: Gigabit Packet Loss

Thanks for the reply.

 

Looks like I have an Antronix CMC 2004H 4-way splitter 5-1002Mhz (-7dB to each port). I only actually have a modem plugged in though.  When splitter is removed, this is my modem result: https://imgur.com/a/lqIJzRF

Added PingPlotter after removing splitter: https://imgur.com/a/W7XkZ2U

 

Still showing packet loss.

 

I did also notice there was an Antronix GLF-1002 Filter. Should I keep that on?

Highlighted
Expert

Re: Gigabit Packet Loss

That's a MoCA point of entry filter. If you are not using MoCA on your network, then remove it. 

 

The bottom line is to live with things the way that they are now for a bit and see if the issue returns. 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!
Highlighted
Regular Visitor

Re: Gigabit Packet Loss

To clarify, are you suggesting it might correct itself? Even with the splitter removed, I'm still getting packet loss in game and also via tests like PingPlotter and packetlosstest.com. 

Highlighted
Expert

Re: Gigabit Packet Loss

The signal stats look better without the splitter in the mix.



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!