Visitor
•
3 Messages
High Corrected OFDM PLC Errors
I'm looking for some direction with High Corrected OFDM PLC Errors. Over the last year, I've noticed I have to restart my modem every other week and sometimes once a week as it quits responding. If I pay attention before this occurs I notice my bandwidth is way low (300-400 mbs) compared to the gigabit I pay for and start to lose packets. I've tried to correlate a number of corrected errors before the issues start to take place but it's all over the place, the screenshot below is after my modem was up for 5-10 minutes.
Testes when this occurs or before include:
* Pinging modem
* Logging into the modem
* Pinging internet via IP not FQDN
* Trace route
Do my values look right, would these corrected errors cause this?
EG
Expert
•
110K Messages
2 years ago
The OFDM is a very wide bandwidth channel that packs a lot of data within. Due to that fact, seeing a large number of corrected errors is normal. The FEC (Forward Error Correction) circuitry / system is doing its job. All of those errors are *corrected* ones. There are zero *uncorrected* errors.
That said. The upstream power is too high and it may be intermittently fluctuating even higher 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 an 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 5-1000 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.
Also check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, etc.
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.
Good luck with it !
0
XfinityAmandaB
Official Employee
•
2.1K Messages
2 years ago
@TestAccount000 Thank you so much for your post on the connection issues you have been noticing. From what you have shared @EG is right on point. Please review the steps provided in that comment and if you are still encountering Issues with the High Upstream Power impacting your connection I am happy to help with getting a technician appointment set up for you! If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you. To send a Direct Message, please click on the chat icon in the top-right corner of the screen, next to the bell icon, and then type or select "Xfinity Support" to initiate a direct message.
Here are the detailed steps to direct message us: • Click "Sign In" if necessary • Click the "Peer to peer chat" icon (upper right corner of this page) • Click the "New message" (pencil and paper) icon • Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list • Type your message in the text area near the bottom of the window • Press Enter to send your message
0
0
TestAccount000
Visitor
•
3 Messages
2 years ago
The Xfinity technician just left, and below is what he found.
He replaced the line going into my house with a new coax. He also added a junction closer to my ground and ran a new ground wire to the new junction.
The run is currently - From the Xfinity distribution box to my house --> single line splitter to POP next to grounding rod --> single line splitter to modem --> Modem
I am back online and will need to test the download speed this evening/early morning as I am currently not seeing the 1.2/40 I typically see. I also now see quite a bit higher ping rate during the upload part of the speed test (I know this can be normal, but it's much higher than was before). I am still seeing corrects for channel 48 OFDM. The technician stated this is a bit expected as the channel is 3.1, and Xfinity is still trying to debug and correct those with new technology. I haven't seen any modem issues, but I will update this thread.
Any thoughts or comments on resolving high ping or current modem stats?
0
0
TestAccount000
Visitor
•
3 Messages
1 year ago
Well, here we are again. Lately, I've been seeing delayed audio (3-5 seconds) and, at times, extremely slow downloads. Support is saying nothing is wrong with the signal to my modem, but the screenshot below shows worse signals at times than the previous show.
Does anyone have any thoughts?
3
0