Cable modem uncorrectables May 12, 2025 · I have been having continuous uncorrectable cable modem errors since early March on all 31 downstream QAM256 channels and the single downstream OFDM channel. This is after being on for about 4 hours. Indicates a signal issue on the ISP line up to the modem. Turning off the modem and waiting for 20 minutes will reset the errors (as expected), and they stop going up for a few hours (1-20 uncorrectables per hour). Mar 7, 2025 · Downstream Bonded Channels Channel Locked Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 11 Locked QAM 256 11 345000000 Hz 9. 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 Dec 15, 2022 · I have a new SB8200 on Optimum 300 Mb cable internet. 6660. Correctables are errors the modem was able to correct. I switched to this modem 6 months ago when XFinity claimed my p May 2, 2025 · Hi all. I have been having issues with voice chats going in and out on apps like discord and teams. The coax cable going into my modem looks a bit warped at the end. I have noticed channel 1 is having tons of issues can anyone give me some insight as to what might be going on? What is channel 1 even used for and why is it having so many issues? I apologize for the inconvenience, It is simple cable modem, so there is no much additional configuration in it. And all those uncorrectables may have been accumulated during maintenance or similar. Modems work best when connected to a low loss splitter port from the main coax cable. Startup Procedure Procedure Status Comment Acquire Downstream Channel 495000000 Hz Locked Connectivity State OK Operational Bo Oct 30, 2020 · I have a Netgear CM1150V cable modem. This is with 5hours + of uptime on the modem. Problem The raw number of uncorrectables is irrelevant. At our old address we would only see a handful of correctable errors. The coax cable running downstairs may be a bit old. Nov 19, 2021 · Ya there should be very little or zero un correctables or correctables. I have Cox GigaBlast. For uncorrectables, the key is to notice an issue and then monitor it. The demarcation line from teh street comes directly into my smart box. It could say 10,000 and mean nothing. Below is the current status for the cable modem after being up for 24 days. Enter the new start frequency and restart the cable modem for it to take effect. That coaxial cable is a direct feed to a wall outlet where another coaxial cable plugs into the wall on one end and my modem on the other. Ideally, you should have 0 uncorrectables but a few here and there are ok. Thoughts on how to proceed here? Aug 12, 2020 · The modem has only been powered on for 1 days 01h:17m:34s. high uncorrectables are problem but you dont have it. Do these signals look ok? I'm worried about the uncorrectables. I have called xfinity support twice now. To give you something for comparison, I just checked both of my modems at two different sites and both of them have a ton of uncorrectables--I need to call my isp as well! Apr 15, 2022 · My service has been fluctuating between excellent and awful lately. Solving Intermittent Cable Modem Issues (plus "loose/bad connectors" and other issues) Version 4. Told him that and he left anyway saying there's nothing more he can do. Be sure to Mar 28, 2025 · Determine what's slowing down your modem with this troubleshooting guide From time to time, modem signal levels can become out of specs. 00, according to my Cable Modem's uptime statistic. Most isp's won't do anything once the line enters the home but they are responsible for it prior to Jan 28, 2020 · For correctables, it doesn’t matter. Sep 3, 2021 · Different modems connect differently to the same signal, so they may have to adjust the signal for this modem. CAT6 is recommended. Be sure the ISP provisions the modem correctly. The cable modem and CMTS act as both interchangeably, depending on data direction. What is the brand and model of the host wifi router connected to the modem? Power levels are kind of all other the place. What actual issue are you having aside from seeing numbers on your modem? We would like to show you a description here but the site won’t allow us. I reset the modem a couple days ago, but the uncorrectables have racked up again. For cable tv, you can split the other line with another multisplitter to all your outlets. The errors include CM-STATUS Type Code Inconsistent internet speeds (cable modem uncorrectables) My parents have spectrum internet only and have complained that sometimes they can’t stream things due to buffering so I told them I would take a look, I do have a Wired desktop to get ideal speeds although most of the actual usage is on wifi. I have had no previous problems for the 2 years I have owned the CM700 modem and Nighthawk 7800 combo. In the meanwhile, the uncorrectables continue to creep back up. There are two functions to the FEC protocol, the encoder and the decoder. We decided not to do that at this time. 3 2094 2516 From the Cable Diagnostics I see Uncorrectables, for an example channel, as 2516. The company develops technologies, products and services that make mobile experiences possible. I just got my first Netgear Modem. ChicagoAmazing Persistent Slow Internet with Arris S33 Modem - High Uncorrectables on Multiple Channels Closed I recently purchased and installed an Arris SB8200 cable modem in my house. 1 and 4. Be sure there are no coax cable line splitters in the between the modem and ISP service box. But the Arris S33 modem is performing flawlessly otherwise! Correctables - Or CRC errors - Aren't necessarily bad; your modem will inevitably have some error'd bits it needs to correct, and, it has 0 "uncorrectables" which means that all of the errors were corrected. 5db coax outputs. 5 dB) and a 4-way splitter (-7 dB), and I'm still facing uncorrectables and errors. Speed Check via Google yields 100MBPS+ which is inline with our service tier from Xfiniity. Internet only. Aug 14, 2023 · I am having frequent disconnects. 16 and over 10,000 on CH. Recenly there is high ping and streaming is hard and gaming is even harder. when the connection drops in the event logs I am seeing "SW Jun 6, 2024 · The accurate calculation of uncorrectable codeword errors is crucial for managing and optimizing cable networks, especially as these networks advance with technologies such as DOCSIS 3. Uncorrectable codeword errors in a DOCSIS network is a sure sign that a subscriber somewhere on your network is losing data. 6. And all those uncorrectables may have been brought on Mar 15, 2018 · I'm getting a large amount of correctable and uncorrectables errors in the log. 02. I logged into our Arris SB6190 modem and noticed that uncorrectables are 10x correctables. 127. In the course of troubleshooting, I check the modem signal levels myself, and see the below. a ton of latency and sometimes it just drops. I have the -3. Be sure your using a good quality LAN cable between the modem and router. i see lots of uncorrectables on my modem Arris SB6183. 01% which makes it a non-issue. This is the Took a look at my cable modem and noticed over 300,000 uncorrectables on CH. I just got to checking and ping times are bad again 1000ms - 1200ms. In looking at the Downstream Bonded Channels page on the webmanager, Dec 8, 2020 · The status listed show the connection state of the cable modem. 2 after only 2 hours of uptime. " at one point. If you do have cable TV, get a 2 way splitter. Make sure the tech looks at these logs. Levels according to the modem are DS snr 41, Rec Pow - 0, Trans Pow 45, and US snr 27. See Aug 8, 2020 · 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. Divide the number of uncorrectables by the total number of octets. After installing I noticed that my internet connection would drop every few hours. When a subscriber is using a device, such as a PC or iPad, and transmits data over a DOCSIS cable modem, the FEC kicks in. My concern was the OFDM channel uncorrectables and the lower upstream power levels. Have the ISP check the signal and line quality UP to the modem. Let’s think of this as a box of chocolates, where BCH is the small foil wrapper around each individual chocolate and LDPC is the box protecting all of the chocolates inside. Apr 5, 2020 · Hi all,I have been experiencing internet issues for the last 3 years at my home. 5 40. Noted potentially with a small % that the cable was pinched a bit so went ahead. Ran the comcast co-ax source to a new room and some ethernet. 1 and I'm on the 600 Mbps plan. Just installed this modem this morning. The line coming in to my home is only a year old, and the one that is spliced to it that runs in to my wall is only 6 months old. 1 channel on my modem appears to have uncorrectable errors that are constantly increasing on average 600 errors per minute (stdev = 160). My CM700 is running v 1. Is this concerning, and is there anything I can do about this? Apr 3, 2022 · My internet cuts out for about 15 seconds once every 20 minutes. May 6, 2025 · Second one just decided to change the cable. Also my speed tests from Should I be worried about the number of correctable code words on channel 1 and 32? Other channels have Uncorrectable Codewords than seem unusually high, too. S33 Cable Signal Levels And the S33 uses a Broadcom chipset. 2. Feb 3, 2023 · I also replaced my aging modem with a new Arris SB8200 modem. 0 channels (1-32) are okay with similar PWR and SNR, with only a hundred or so correctable errors across a 12 hr uptime. Cable Connection Frequency start Value This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Oct 29, 2023 · After doing some extensive research (I use that term loosely ;) I have found out the following: 1) Based on my numbers, my SNR is very much within spec, as are my power levels. The dmark line has a MOCA filter then feeds into a 3 way splitter with TWO -7db and ONE -3. Most of the time this happens during the initial boot up while it is syncing, it's just bound to happen. CM1000v2. The support person said they boosted the signal. Like you said, higher accumulation of uncorrectables are where a problem indicator comes into play. That amount of uncorrectables over the course of 29 days is nothing to worry about if you aren't seeing connection issues. 12) show 10,370 in 24 hours. When the cable modem receives the data frame it has to first decode the LDPC and then the BCH. From what I can gather, the power and SNR levels are OK, but the corrected/uncorrectables are extremely high. May 17, 2021 · General failure. This is usually a symptom of degrading or underperforming hardware or another problem. Jun 21, 2022 · Errors increase constantly. 10. I've seen only a few dozen Mar 8, 2021 · I seem to have touched on a nerve. Should be with in Jul 7, 2020 · The technician who installed the modem also included a 6 dB attenuator on the coax cable. Current: I have used both a 2-way splitter (-3. Does anyone know why I have so many uncorrectables on these channels? OP has 3 options assuming cable from the box is good (unknown) - install a dedicated line to the cable modem from the box no splitters, use a tap vs splitter to avoid signal loss (signal loss is defined as signal to noise ratio), or install an amplifier. Here's some of the modem levels found under the Downstream OFDM Channels section (I tried copy and pasting but the formatting was a mess so just going to write down the data in order). I know the corrected on the OFDM is normal but is anything else unusual going on? Modem is the Motorola MB8611 Oct 10, 2023 · Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. 1 Cable Modem (CM3000) . Jun 5, 2018 · correctables number is fine. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels. 3. I have no splitters on my line anywhere. I too am having issues getting the downstream fully bonded, however I am on Cox. 82 (i downgraded to test if software was Sep 6, 2021 · The upstream power is too high and it may be intermittently fluctuating even higher to out of spec levels. 4a (updated September 16, 2023) Sep 17, 2012 · DOCSIS codeword errors and uncorrectable codeword errors have been available as a troubleshooting aid in CMTSs for sometime and are not becoming more prevalent in test equipment. 0. These packets are getting fixed at modem. Jul 2, 2007 · We moved to a new address in the same zipcode and simply transferred our internet service from the old address, new address being already wired for our cable broadband ISP's service (prev owners had same ISP). I wouldn't have noticed the change but my connection has May 17, 2021 · If you do not have cable TV, you should plug your cable modem directly into the line coming into the house. My main concern here is the really high number of Uncorrectable codewords. Typically 1x2 splitter; one port to modem and second port to 1xN splitter for additional outlets. Aug 27, 2020 · Hi. Since all the signals are in range and enquired about the correctable and uncorrectable, we suggest you to R-Re-provisioning the modem to fix it. I had a similar issue with uncorrectables and a faulty splitter or normal signal degradation caused by it was causing the issue for me. Nov 29, 2022 · Below is the Status report and Event Log for new install of an SB8200 Modem with the Surfboard 2 tower wifi 6 mesh system added on. To address in-attic signal noise would require in-attic inspection, splitter replacement, possible cable replacement, etc. Googling suggests installing a MoCA filter might help, so I've ordered some. I found that my US(Upstream) power (modem transmitting data to the ISP) was Nov 18, 2019 · Lines splitter, attenuator, amplifier, kinked cable, bad cable, moisture in cable, corrosion to connector. So today I was looking at the cable that comes into the house, and it is split two ways, for a cable box and for the internet modem. The downstream OFDM channel seems to have power This week had someone come out and run some networking cable around my house. 08 and my 7800 is running v 1. XFinity keeps saying the connection is fine. My modem is an ARRIS surfboard SB6183. I have the Netgear CM1000v2 modem with DOCSIS 3. e4ca. This house was built in 2002. From what Ive gathered, my amount of uncorrectables over the course of X amount of days is nothing to worry about, since I am not seeing and speed/connection issues. 1. 5db line running into the DOCSIS® 3. Before the change I had a major issue with the shitty co-ax in the wall of the house causing a lot of "uncorrectables" on my Arris modem on many different channels. By effectively monitoring these errors, cable operators can maintain high-quality service and rapidly address problems that could affect subscriber QoE. I replaced the modem for a Netgear CM2050V, purchased a hefty pfSense router, and installed MoCA adapters (completely isolated from the modem's The tech replaced the cable from the distribution point to my modem, no change. The modem is connected directly to the Optimum-provided cable in house, about a 10ft run to outdoor cable connection. Feb 25, 2021 · Our internet service has always been spotty. And the channel #19 will jump back to ~37. can Someone interpret this and see if Feb 6, 2022 · just ordered a new nighthawk 1150v modem bc i know the one i got is outdated but i wanna fix this signal problem before i change modems i am running all these tests from my gaming pc wired not even a foot away from the router and modem and there no more than 5 devives on the wifi if you cant tell on downstream line 5 shows uncorrectables as 911. ARRIS is known around the world for innovation in communications. Sep 21, 2020 · Observed signal noise over in-attic line, which feeds the cable modem Cable from exterior attic entry to the cable modem is perhaps 130', with at least one known splitter. The line from your provider is bad. There are no other devices bridging the cable. If your modem is behind a splitter try removing the splitter or moving the modem to a coax connection that is closer to where the line from the street enters your home. Jun 20, 2024 · Connecting my laptop directly to the modem did eliminate the wifi packet losses, but not the uncorrectables--as expected. If it’s Jul 9, 2021 · Arris sb8200 modem, 1200 mbps service - Up until recently (about a week now), my correctables and uncorrectables were always close to zero. The DOCSIS 3. However, we get. Are the values for the Correctables and Uncorrectables normal? Also, are the po May 28, 2008 · 64000:7A# The modem new modem for this customer is 001a. ARRIS portfolio includes communications infrastructure, enterprise mobility solutions, digital set-tops, cable modems, mobile phones and Bluetooth accessories . Regardless, the Arris recommended levels are similar to the levels you posted. Usually the best bet is to directly connect the line wherever it enters your house to the modem. Leave out any splitters. Split the line coming into your house with 1 of those into your modem. Question: What are codeword errors? The DOCSIS 3. It's likely the number is below 0. Jun 3, 2019 · Hi I have not had any issues with my RCN and CM500 modem for 6 months. I contacted xfinity and they did something on their end, but it did not work. I’ve had problems with weak or briefly dropping internet along with event log timeouts with old Netgear modem for a long time also. Is this a problem with the Netgear device of a problem with the ISP (Spectrum)? Attaching photos of my modem status (note the modem was restarted last night - prior to the restart I had uncorrectables on nearly every channel) Also attaching a diagram of my network setup. I am using Ubiquiti Amplifi Alien router along with Feb 22, 2024 · I've been battling Xfinity internet issues for years. When I was looking at my modem, it seems like I have a very level of uncorrectables that seem to keep going up by the hour. Be sure your using good quality RG6 coax cable up to the modem. My modem is a Netgear CM1200. 5dB Sep 24, 2024 · Hello, I recently got a CM3000 modem (from SB8200) to take advantage of the new upload speeds. Following the change this issue seems to be corrected. 2. At the new (to Context/Home Set-Up: I have Comcast as my ISP. Is this a ISP issue? Occasionally the modem goes offline and requires a Now I don’t have much of an idea of what it all means, but I noticed that on all the channels the uncorrectables were very high, most in the 100,000’s and the correctables were lower at only a few thousand. They are used by your service provider to evaluate the operation of the cable modem. Looking at this modem's uncorrectables in the mib browser (1. Was getting numbers lower than -15, so disconnect everything but cable modem, and got power level numbers to sometimes have levels in positive range and under -10. The first comcast tech I talked I informed him that I recently installed the cable modem and my connection dropped every few hours. The Comcast line drop to my house is connected with a single barrel connector outside my home to just one coaxial cable. I've also ordered a new cable modem. ralbqzl wsiso kkemagf mqbw slv azigbins qcsq herbqd lpsjzs dkxpw uymd kijpdv kegn jaji yaourq