This stuff is great, I work for an ISP and semi-regularly have to remember how SNR/Power/MER work and you're the only person on youtube doing videos with such quality and conciseness. Keep it up!
This was helpful. My issue was my main coax coming into the house was plugged into a splitter that was occupied by 6 different cables that weren't being used. The cable I was using for the modem was fed into a wall splitter that screwed into another angeled splitter. Taking off all the unused cables from the main splitter and removing the angeled splitter resolved my issue. I also found out about coax terminators that you can use to cap off unused connections on the main splitter.
Good info. I went to a gigabit cable sub back in March and for 2 months had no issues. Then last week I started to get disconnected multiple times a day. I tried various 'fixes' and the ISP kept saying everything looks good to the modem. Since ISP modems don't allow access to logs or stats I bought my own, a Netgear CM2000. I saw many error messages like No Ranging Response received - T3 Timeout, SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing, to name a couple. So I contacted my ISP and they sent out a tech and for the most part saw a great connection but then packet losses every so often. So he replaced the splitter at the box on the side of the house and removed the only splitter inside the house and made a new connector due to possible oxidation. That appeared to resolve my problems since I've gone 15 hours since the last disconnect. So if you are having issues, look at your connection from the box outside to your modem and remove as many splitters as you can. I don't need any inside the house because all I have is internet. We stream now to our TVs with Firesticks so for us a strong wi-fi signal is more important than having coax in every room. If there are additional issues the tech recommended escalating to the next tier to have someone look at the tap at the pole. He thinks the one we have was put there in the 1980s but he can't tell because all identifying labels are no longer visible.
This video helped me diagnosing the reason for my dropped connections. I love the simple (simple for me at least) explanations about the different sections as it helped me understand what the heck I was looking at. End result..... I need a new modem! Thanks! Liked and subscribed!
Don't get me wrong, John is great...he is so knowledgeable about broadband...but content like this is what helps newer techs in the industry. Easy to digest info. John can go off on a tangent and will get very technical, and I'm sure those same newer techs will be sitting there, scratching their head 🤣.... again, great stuff
Hi Brady, thank you for this great information. You've mentioned that downstream receive power should be between -10 to +10dBmv, I would like to ask if this is a standard receive level for a DOCSIS 3.0 system? Because other cable operator imposes -8 to +8dBmv receive power. Thank you
Hello @engrboltz, a standard downstream receive power range for cable modems is - 10 to +10 dBmV, with an ideal level of 0 dBmV. It is advisable to maintain a receive power between - 8 and +8 dBmV, as this further optimizes the level and offers greater stability during temperature fluctuations, plant alterations, and other factors. This way, the modem is less likely to fall outside the acceptable +/- 10 dBmV range.
Where would I find a setting to change my mtu setting ? I just want to get the best performance out of my gateway. I saw a different video explaining something about pinging to find out the max setting that could be used for the mtu setting.
Hi Borb57JC you can change the MTU settings directly on Linux machines by running the following command: "ifconfig mtu up". This is done on an interface level. There are likely similar commands for Windows and Mac. You want to match this on all switches in the network.
thank you this was very helpful my internet was being over boosted :( removed my drop amp and the downsteam numbers got much better went from +16dbmv to -7.5dbmv
So I have been having issues for over 6 months now and I’ve had 3 Techs come out to try and resolve my issue. My Wi-Fi cuts out randomly for about 5-10 mins multiple times a day. I logged into my gateway online and I’m having a ton of Uncorrectable Codewords. Do you have any suggestions on things I can do myself to try and fix the issue? My SNE, power, etc is all good. Any suggestions? Thanks
Hi Main Legit, if you have uncorrectable codewords showing on the modem, then your WiFi maybe cutting out because data is cutting out to your modem. My recommendation is first ensure its not your in-home wiring. Get a good piece of coax and run the coax directly from the outside drop to your modem. If your uncorrectables go away, then its bad coax/connectors/splitters, etc. in your home. Find them and eliminate. If you still have uncorrectables over time, then you need to show what you did (running coax from the drop to your modem) to the next tech that shows up and also show him/her the uncorrectables when connected to the drop and let them know they need to 1) replace the drop and 2) if that doesn't fix it they need to work on the outside plant - its their issue to resolve.
Hi, I really hope you answer. So I have a 32 channel modem, i noticed that channels 25-27 build up alot of uncorrectables in the morning and the power goes up around +8 dBmV on all three of them and when this happens my modem stalls for a few seconds causing my router to lose internet connection and disconnects all my devices for a minute. This happens 2 times a day, one in the morning, one in the evening. My question is, if I buy a 16x4 modem, will this problem go away, since these uncorrectables always occur on channels 24+ ?
Maybe and maybe not. If your 16x4 locks to the same downstream channels that are causing issues with your 32x8 modem then you will still have the same problems. First check your home wiring and make sure this is not an issue with a high power sodium light turning on. Since it occurs in the morning and night its likely a noisy light or something similar turning on and disrupting the signal. The noise is most likely getting in around your drop or inside your house. If not there, then let your cable operator know about the issue and especially the time of the issue. This is very helpful trouble shooting info for them.
Splitters usually don’t need to be grounded inside the home. I am not sure of the requirements on outside dwelling splitter grounding. I don’t usually see this done however, so I don’t believe it is required. A ground block is required.
@@Volpefirm In my case it made all the difference. I always had very poor net for online gaming but after grounding my home splitter all the sudden it was unreal my net became great for online gaming. But this means that probably i have interferences in my home right?
Hi @Byynx, I hesitate to guess on what the root cause is in this situation. I'm glad your network has improved, but I'm not sure what the root cause may be.
Thanks for the video. I have 7 unlocked upstream channels and my ISP says it looks like it’s a problem from their end. I had feared my modem (less than 2years old) was going bad.
Hi Carol, unlocked channels are almost never related to a bad cable modem. When a cable modem goes bad they usually are just dead due to a bad power supply and not LEDs work. So you did good. :)
Great info! Question- my Motorola mg7700 modem is showing t3 errors in the log file only on powerup. The front downstream led comes on at boot up but goes totally out. After connecting to the internet. the downstream channels are all locked. Downstream Snr = 37 - 38.5 db Upstream power is 54 dbmv with channels locked. The modem wifi radios are turned off since I’m letting mesh handle tx/rx radio duties. I read somewhere that the upstream my have excessive noise causing downstream issues. Or maybe high upstream power? Have you seen this before? I have the ISP tech coming to check the lines tomorrow. If it’s my equipment they said they are charging me $70. Just wondering if I should call them off. Thanks!
Hi Big Kid, sorry I missed this before your tech came out. It looks like your modem was at max transmit which may have been due to a bad drop or in home wiring. What did they find out?
Hi Volpe - what would be your recommendation for trouble shooting this issue with spectrum. reboot cable modem, get full advertised speeds but after ~1 hour performance is diminished to 1mb download speed.
Hi JJnATX have you confirmed you are not being throttled due to usage caps? If you are not, do you notice the speed slows during any specific time? Network congestion could be the issue if it is occurring intermittently. Also, I would recommend eliminating the wireless network and perform a speedtest when directly connected toe the modem / router. Finally, please do rule out the router by doing a direct connect to the modem. Let us know what you find.
how do you lock a channel. I have 32 channels and all are locked but 1. I have very slow speeds. I did all the resets and reprovisions. not sure what I should do next. xfinty sent signal after signal and Netgear changed channel after channel. nothing is working
Unless you're experiencing issues, you will be fine with 31 out of 32 channels locked. If you are experiencing issues, then I recommend checking your in home wiring and connectors - make sure connectors are tight and there is no damage to your coax cable. Next steps are to call your cable operator - Comcast does have very good troubleshooting tools, but you may need to be very clear of the issues you have.
I installed the arris S33 modem on my internet because it was on the so-called "recommended list" of DOCSIS 3.1 modems from xfinity for my address. This modem did not perform well only delivering 100-200Mbps to my network and seemed to overheat. I returned it and bought a Netgear CM1000v2 modem which has Xfinity on the box. When I activated it with Xfinity a warming symbol came up saying that I needed to upgrade to DOCSIS 3.1 even though this router is a DOCSIS 3.1 modem. When directly connected from new modem to my computer I was getting 750Mbps internet speed which seems reasonably decent. When I inserted my ASUS AT-RX1800s router back my internet speeds dropped to about 350Mbps with all of the settings optimized. Is the router bottlenecking my internet speed? When I log on to my Netgear CM1000v2 modem, only possible when it is directly connected to my computer, I only am allowed to change password, and log at the log file. I cannot obtain any detailed status about this modem. Does Xfinity turn this off?
Hi Glenn, Its unlikely there is anything being blocked in the modem. This is more likely an issue between the modem and router. Ideally you will want to put the modem in bridge modem so that is not doing any routing and have your router manage all traffic.
@@Volpefirm I am not sure what you mean by "put the modem in bridge modem". I simply inserted the router between the computer and cable modem. The router is handling all of the routing and my connection was measured in the "wired" mode. I see a small reduction in speed in wireless mode to my MacBook Pro, both router and computer are equiped with wifi6. If the router is handling multiple routes to other computers that could also degrade the speed.
My Arris SGB10 cable modem won't connect to the DNS server for some reason. I called the modem company technical support line and was connected with a service rep in Asia that didn't speak English well enough to effectively assist me.
Hi Traveler10 your modem should get the DNS server information from your cable provider. You will need to contact the cable provider in order to have them troubleshoot a modem DNS issue.
Hi! I have been trying to find information whether a DOCSIS 3.1 modem from the US-region would work in Europe? I know differences between earlier EURODOCSIS and DOCSIS standards but I'm curious to know if modern modems are able to adapt to any environment or is the hardware so fundamentally different (hard to believe) to truly warrant different models? The reason I'm asking is that the situation with many ISPs here in Europe is such that none that I know of offer a modem only solution. I know many home network builders would prefer a pure modem instead of a wifi modem/router. I haven't received a clear answer to this even from my ISP and seeing that some modems (like the Technicolor TC4400) have a "dual mode" that lists both DOCSIS 3.1/EURODOCSIS as supported makes me wonder if they would simply work if plugged in :) I would be very grateful if you could shed some light on this.
Hi Mikko, in many cases there will be a good possibility that the firmware in the modem will be programmed to frequencies and a diplex filter bandwidth that will not be compatible with your cable service provider. There are some modems that will be fully supported, but it would very difficult, even for me to be able to make this determination.
I'm experiencing latency jitter that varies quite a bit but every other ping is a 10+MS spike. The modem shows 1439575373 corrected errors on channel ID 25. These corrected errors seem to keep increasing each refresh of the page. They are sending someone out to check everything which they failed to check today. The guy replaced the modem with basically the same modem as well. What type of problem causes that many errors?
Hi Derektrash8142 correctable and uncorrectable errors maybe caused by the outside plant or in home wiring (like bad connectors and cables). If you have a neighbor with a cable modem see if you can check their modem and if they have errors as well. If they do not, then the root cause is likely bad connectors or cables from the drop to your house or wiring inside your house. You can move your modem closer to the entry of your house and see if errors are reduced. Think "divide and conquer". If your neighbor does have errors too, then its an outside plant issue that will need to be escalated to the cable operator. You can also escalate for your in-home wiring, but I like to try and do some troubleshooting myself just in case I have a bad cable that I can replace on my own.
@@Volpefirm I will do that, I will also mention that on that port 25 (OFDM) there's multiple profiles (Profile 0, 1, 2 & 255) The active profile has 775,066,634 corrected codewords out of 775,170,751 possible. The other profile 255 is 125 billion out of 126 billion possible corrections. The profile 1 & 0 have little to no corrections. I just find it really weird. They said they're looking into it. The guy who came said he replaced an old cable but it didn't do anything.
Hi Natural Gaming, your modem likely is not getting enough downstream level - at least that is the most probable issue. Check your cables and connectors. If they are good and snug, you will need to contact your cable operator.
I had an sb6190, and after 6 months it stopped working today. I had a technician come out and take a look and he said that it was sending electricity through the lines, causing interference. He said to get a new modem, and things should work fine. I got a new one (same type of modem) and it’s still not getting past the second light. When I checked the website, it says the Downstream channel (the first step) isn’t locked. At this point, is it safe to assume its not the modem, but rather the coax or ISP?
Hi @Dat Boi yes it is very seldom that the modem is the problem. Also, modems do not and are not capable of sending electricity down the lines as stated. There are devices called RF chokes that prevent this. So it is very safe to say that it’s not the modem 😖
How do I deal with Pocket Loss everything was OK until I set up my New Docsis 3.1 it seemed ok I lost Connection alright got back on Downstream lighted Green, Upstream light Green but as soon as I talked to my Cable Provider they say I have Packet Loss all I'm getting is kinda slow Imternet what do I do
Hi Badass, how is your packet loss now? Its been three months since you made this post and cable operators have learned a lot in the past few months about OFDMA. Curious if your problems have improved.
Hey my DOCSIS Event says warning Mimo event mimo you said not to worry sbout this messages but my internet is really bad and i feel like this error means something what do i do
Hi GTA5film - MIMO is indicating whether your modems supports IPv4 or IPv6. This is messaging between the modem and CMTS as regular status updates on the modem can do and does not indicate any problems. Are you seeing any uncorrectable codewords? If not, I recommend you connect your computer to the modem with an Ethernet cable to rule out Wifi issues. If it gets better then you may need to improve your WiFi network.
so my cable modem is an arris router and my problem is that it became slow and scuffy. In my router lights it supposed to have 2 lights, the recieve and send blue light. When it is only 1 blue light the problem starts. I did what i can like resseting the settings and the router. What should i do? edit: when i check the router settings it is only 1 Upstream Bonded Channel. before the problem it has 4 upstream bonded channel
Hi Charles, when your modem has only 1 upstream channel this may cause slow upstream speeds. If you also have only one downstream, that will cause slow downstream speeds. The modem drops channels due to channel impairments. Rebooting the modem may allow the modem to pickup the channels again until the impairments are fixed. The impairments could be in your house. Be sure to check all connectors and cables from your modem to as far as you can to the cable operator network. Use good connectors and cables and make sure they are tight.
It would be too simple to start by saying look at your DSL-1 & DSL-2 lights and Internet light and see if they are lit, telling you the server is sending something?
Hi Bob, its likely that your cable operator has locked this page out so you can't get access. This has become more frequency since CableHaunt hit last year.
HFC ISPs should straight up just pay you to train their employees on everything DOCSIS, then pay Metageek and Jerry Jongerius / Duckware for WiFi training. No need to reinvent the wheel when experts like yourself explain these kinds of things in amazing detail without getting overly technical.
Hi Calen thanks for watching. The SYNC error message is fairly common. Every 200 msec (that’s 5 times per second) the CMTS sends a SYNCronization message to the modem. If the modem misses one of these messages it throws up that alarm. It’s not a big deal unless the modem goes offline and you see a flood of those messages. So a few here and there is not an issue. A log full of them 5 every second indicates a downstream problem.
All my problems here in Idaho with Spectrum has to do with a system that is over 50 years old. Having my residential service line replaced solved ALL my problems with dropped signal. However, every time it rains my band width drops from 250mbs to less than 10mbs. Every time a tech comes out, they want to blame problems on my in house wifi. They don't know that I have brand new equipment, modem, nest router, laptop. My ethernet connection bandwidth is within 10% of my wifi. I'm convinced technicians don't like climbing ladders. Someone needs to make a video on how to successfully make Spectrum address THEIR system deficiencies.
i’m having trouble connecting to the internet, my upstream and down stream LED colors are solid blue, my power light and internet light are both solid white, what do i do?
Hi Christopher, what are you seeing in the Cable modem diagnostic screens in terms of downstream power level and downstream MER? Same for upstream transmit level? Also, please record these values over the next day and see if they fluctuate very much. Finally, please see the video I just posted on fixing your internal wiring to make sure you don't have any faulty coax in or around your house.
Hey it's Chris here found out the voltage on the upstream's power was about 54.6 dBmV I live in a apartment complex I went to the main cable central Hub unit found out the connection at the main tap was shorting out fixed it since then I now get all four channels in no more T3 and T4 timeouts. The power now is 40.7 dBmV
Hi Raaid, this error often happens when you have a config file that is not correct for your cable modem. Have you contacted your cable operator about the error message?
@@Volpefirm I got it fixed so basically the upstairs cable was bad and we decided to connect to the first floor cable instead and our internet got fixed and it hasn’t gone done in months. I’m guessing the second floor has some wiring problems.
Hi Mike, if you are getting a "disabled / denied" status it could be a couple of things. Usually disabled or denied indicated your service has been terminated because you have not paid your bill. However, a new issue has occurred with DOCSIS 2.0 and 3.0 modems where the BPI+ (for security) certificates expired in March and April of 2021. Modems with expired certs will be rejected by the CMTS. If you purchased your own modem many years ago, check with your cable provider and see if this is the issue. You can rent a modem or buy a new one and this will resolve the issue - or check with you cable operator and verify your all paid up.
In 9hrs Uptime on my modem My Uncorrectables were all betwen 60,000 and the highest amout of uncorrectables were 111,675. is there an issue here? I do experience packet loss.. if so what do I do?
I also do need to mention that the highest correctable was only 21,433. ( i have saved screen shots because my modem always crashes and resets this data..)
Hi Seth. What are the total code words? You need to calculate the percentage of code word errors. This is done by the following: ( code word errors / total code words ) x 100 That will give you the percentage. Ideally it should be less than 1%.
I pasted my error message in google and nothing useful came up. I pasted in RUclips and this video came up. Turns out I had a wonky 90-degree/right-angle connector that was of the swivel type which made the outside connector loose af. Since removing it from the equation, no issue! Subscribe for more cable fun facts!
when suddenlink limits me to 300 gigs per month the hikes up the bill if exceeded and then i find out my friend who lives in town who also has suddenlink and UNLIMITED data AND HIS BILL IS CHEAPER. I which i had the drive to harass the crap out of them [ the guy who answered the call i think he gets a pass bc he doesn't have any authority. everyone else is fair game. I WISH I HAD THE SKILL TO ASK STUPID AND/OR IRRELEVANT QUESTIONS ** Power to cry ** Tell sad storys to manipulate ** Talk someones ear off [truly fascinating sight to see. "they don't want to listen to this."
I feel you. My refrigerator broke recently. 1 month after its warranty ran out. I too wish I had the skill, energy and right questions to harass the refrigerator company to make refrigerators "like they used to". Maybe the same situation, but I get it!
Hi Tall Guy, we need competition in the market, so having both Broadcom and Maxlinear (Puma) is good. We hope that both companies continue to produce better chipsets moving forward.
*". .troubleshoot your modem...."* 1 ring your provider and spend an hour listening to the message stating how important your call is. 2 Get an interpreter to translate the call agent. 3 Spend vast amounts of time unplugging the ethernet, checking network status and rebooting the modem and all your equipment. 4 Try not harm your neighbour because your stress levels are growing at an exponential rate. 5 Blow your lid as the agent threatens you with call out charges if the problem is found to be with your kit 6 Threaten to move to a new provider if they don't sort your shitty problem out by tomorrow 7 Stand by as you're passed off to the retentions department 8 Repeat everything again to the retentions department. 9 Seethe with rage when the retentions agent says *"... I'm sorry sir, let me put you through to the faults department who can help you with that problem..."* 10 Holding your partner off the ground by their throat isn't good for them, let them go because it's not their fault.
Going through this right now. There's some hope because the neighbor also has issues. Last tech they sent couldn't fully speak English, and was oblivious to the modem status page. They ignored the thousands of uncorrected errors and the 55dbmv spikes on the upstream channels. They just said the signal looks good, ran a 2 second speed test, then left. Next best thing is to switch ISPs. Now to convince my partner to move their email. Arguing with that tech sounds less stressful.
Troubleshooting, not a tutorial on channels, receive power blabla. Your explaining stuff no one cares about. My units not working, why do I care about mer blabla!
This stuff is great, I work for an ISP and semi-regularly have to remember how SNR/Power/MER work and you're the only person on youtube doing videos with such quality and conciseness. Keep it up!
Thanks for watching and glad to help!
This was helpful. My issue was my main coax coming into the house was plugged into a splitter that was occupied by 6 different cables that weren't being used. The cable I was using for the modem was fed into a wall splitter that screwed into another angeled splitter. Taking off all the unused cables from the main splitter and removing the angeled splitter resolved my issue. I also found out about coax terminators that you can use to cap off unused connections on the main splitter.
Great job troubleshooting!
Good info. I went to a gigabit cable sub back in March and for 2 months had no issues. Then last week I started to get disconnected multiple times a day. I tried various 'fixes' and the ISP kept saying everything looks good to the modem. Since ISP modems don't allow access to logs or stats I bought my own, a Netgear CM2000. I saw many error messages like No Ranging Response received - T3 Timeout, SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing, to name a couple. So I contacted my ISP and they sent out a tech and for the most part saw a great connection but then packet losses every so often. So he replaced the splitter at the box on the side of the house and removed the only splitter inside the house and made a new connector due to possible oxidation. That appeared to resolve my problems since I've gone 15 hours since the last disconnect. So if you are having issues, look at your connection from the box outside to your modem and remove as many splitters as you can. I don't need any inside the house because all I have is internet. We stream now to our TVs with Firesticks so for us a strong wi-fi signal is more important than having coax in every room. If there are additional issues the tech recommended escalating to the next tier to have someone look at the tap at the pole. He thinks the one we have was put there in the 1980s but he can't tell because all identifying labels are no longer visible.
Hi Patrick, great success story and great advice. Thanks for sharing.
This video helped me diagnosing the reason for my dropped connections.
I love the simple (simple for me at least) explanations about the different sections as it helped me understand what the heck I was looking at.
End result..... I need a new modem! Thanks! Liked and subscribed!
Thank you so much! Glad we could help out.
Don't get me wrong, John is great...he is so knowledgeable about broadband...but content like this is what helps newer techs in the industry. Easy to digest info. John can go off on a tangent and will get very technical, and I'm sure those same newer techs will be sitting there, scratching their head 🤣.... again, great stuff
Thanks for the feedback. Will try to some more episodes with a back to basics focus. 👍
Hi Brady, thank you for this great information. You've mentioned that downstream receive power should be between -10 to +10dBmv, I would like to ask if this is a standard receive level for a DOCSIS 3.0 system? Because other cable operator imposes -8 to +8dBmv receive power. Thank you
Hello @engrboltz, a standard downstream receive power range for cable modems is - 10 to +10 dBmV, with an ideal level of 0 dBmV. It is advisable to maintain a receive power between - 8 and +8 dBmV, as this further optimizes the level and offers greater stability during temperature fluctuations, plant alterations, and other factors. This way, the modem is less likely to fall outside the acceptable +/- 10 dBmV range.
Where would I find a setting to change my mtu setting ? I just want to get the best performance out of my gateway. I saw a different video explaining something about pinging to find out the max setting that could be used for the mtu setting.
Hi Borb57JC you can change the MTU settings directly on Linux machines by running the following command: "ifconfig mtu up". This is done on an interface level. There are likely similar commands for Windows and Mac. You want to match this on all switches in the network.
WOW i loved this video. great work man. very informative !!!
is anything wrong if im getting 230Hz-400Hz on my downstream channels ?
Not at all
thank you this was very helpful my internet was being over boosted :( removed my drop amp and the downsteam numbers got much better went from +16dbmv to -7.5dbmv
Glad this helped
This was an awesome video!! I'm trying to track down issues with spurious drops of signal so the analyzer will be a nice tool to use.
Awesome Dave. Thanks for the feedback!
VEry helpful thanks. Trying to troubleshoot downstream scanning issues on Orbi CBR750
So I have been having issues for over 6 months now and I’ve had 3 Techs come out to try and resolve my issue. My Wi-Fi cuts out randomly for about 5-10 mins multiple times a day. I logged into my gateway online and I’m having a ton of Uncorrectable Codewords. Do you have any suggestions on things I can do myself to try and fix the issue? My SNE, power, etc is all good. Any suggestions? Thanks
Hi Main Legit, if you have uncorrectable codewords showing on the modem, then your WiFi maybe cutting out because data is cutting out to your modem. My recommendation is first ensure its not your in-home wiring. Get a good piece of coax and run the coax directly from the outside drop to your modem. If your uncorrectables go away, then its bad coax/connectors/splitters, etc. in your home. Find them and eliminate. If you still have uncorrectables over time, then you need to show what you did (running coax from the drop to your modem) to the next tech that shows up and also show him/her the uncorrectables when connected to the drop and let them know they need to 1) replace the drop and 2) if that doesn't fix it they need to work on the outside plant - its their issue to resolve.
Hi, I really hope you answer. So I have a 32 channel modem, i noticed that channels 25-27 build up alot of uncorrectables in the morning and the power goes up around +8 dBmV on all three of them and when this happens my modem stalls for a few seconds causing my router to lose internet connection and disconnects all my devices for a minute. This happens 2 times a day, one in the morning, one in the evening.
My question is, if I buy a 16x4 modem, will this problem go away, since these uncorrectables always occur on channels 24+ ?
Maybe and maybe not. If your 16x4 locks to the same downstream channels that are causing issues with your 32x8 modem then you will still have the same problems. First check your home wiring and make sure this is not an issue with a high power sodium light turning on. Since it occurs in the morning and night its likely a noisy light or something similar turning on and disrupting the signal. The noise is most likely getting in around your drop or inside your house. If not there, then let your cable operator know about the issue and especially the time of the issue. This is very helpful trouble shooting info for them.
A little off topic but how important is having splitters grounded?
Splitters usually don’t need to be grounded inside the home. I am not sure of the requirements on outside dwelling splitter grounding. I don’t usually see this done however, so I don’t believe it is required. A ground block is required.
@@Volpefirm In my case it made all the difference. I always had very poor net for online gaming but after grounding my home splitter all the sudden it was unreal my net became great for online gaming. But this means that probably i have interferences in my home right?
Hi @Byynx, I hesitate to guess on what the root cause is in this situation. I'm glad your network has improved, but I'm not sure what the root cause may be.
What's the difference between 3,0 to 3,1
Well quite a bit. I recommend you watch some more of videos and you can also read up on the basics at our blog on volpefirm.com
Thanks for the video. I have 7 unlocked upstream channels and my ISP says it looks like it’s a problem from their end. I had feared my modem (less than 2years old) was going bad.
Hi Carol, unlocked channels are almost never related to a bad cable modem. When a cable modem goes bad they usually are just dead due to a bad power supply and not LEDs work. So you did good. :)
Great info!
Question- my Motorola mg7700 modem is showing t3 errors in the log file only on powerup. The front downstream led comes on at boot up but goes totally out. After connecting to the internet. the downstream channels are all locked. Downstream Snr = 37 - 38.5 db
Upstream power is 54 dbmv with channels locked.
The modem wifi radios are turned off since I’m letting mesh handle tx/rx radio duties.
I read somewhere that the upstream my have excessive noise causing downstream issues. Or maybe high upstream power?
Have you seen this before?
I have the ISP tech coming to check the lines tomorrow. If it’s my equipment they said they are charging me $70. Just wondering if I should call them off.
Thanks!
Hi Big Kid, sorry I missed this before your tech came out. It looks like your modem was at max transmit which may have been due to a bad drop or in home wiring. What did they find out?
Hi Volpe - what would be your recommendation for trouble shooting this issue with spectrum. reboot cable modem, get full advertised speeds but after ~1 hour performance is diminished to 1mb download speed.
Hi JJnATX have you confirmed you are not being throttled due to usage caps? If you are not, do you notice the speed slows during any specific time? Network congestion could be the issue if it is occurring intermittently. Also, I would recommend eliminating the wireless network and perform a speedtest when directly connected toe the modem / router. Finally, please do rule out the router by doing a direct connect to the modem.
Let us know what you find.
how do you lock a channel. I have 32 channels and all are locked but 1. I have very slow speeds. I did all the resets and reprovisions. not sure what I should do next. xfinty sent signal after signal and Netgear changed channel after channel. nothing is working
Unless you're experiencing issues, you will be fine with 31 out of 32 channels locked. If you are experiencing issues, then I recommend checking your in home wiring and connectors - make sure connectors are tight and there is no damage to your coax cable. Next steps are to call your cable operator - Comcast does have very good troubleshooting tools, but you may need to be very clear of the issues you have.
I installed the arris S33 modem on my internet because it was on the so-called "recommended list" of DOCSIS 3.1 modems from xfinity for my address. This modem did not perform well only delivering 100-200Mbps to my network and seemed to overheat. I returned it and bought a Netgear CM1000v2 modem which has Xfinity on the box. When I activated it with Xfinity a warming symbol came up saying that I needed to upgrade to DOCSIS 3.1 even though this router is a DOCSIS 3.1 modem. When directly connected from new modem to my computer I was getting 750Mbps internet speed which seems reasonably decent. When I inserted my ASUS AT-RX1800s router back my internet speeds dropped to about 350Mbps with all of the settings optimized.
Is the router bottlenecking my internet speed?
When I log on to my Netgear CM1000v2 modem, only possible when it is directly connected to my computer, I only am allowed to change password, and log at the log file. I cannot obtain any detailed status about this modem. Does Xfinity turn this off?
Hi Glenn,
Its unlikely there is anything being blocked in the modem. This is more likely an issue between the modem and router. Ideally you will want to put the modem in bridge modem so that is not doing any routing and have your router manage all traffic.
@@Volpefirm I am not sure what you mean by "put the modem in bridge modem". I simply inserted the router between the computer and cable modem. The router is handling all of the routing and my connection was measured in the "wired" mode. I see a small reduction in speed in wireless mode to my MacBook Pro, both router and computer are equiped with wifi6. If the router is handling multiple routes to other computers that could also degrade the speed.
My Arris SGB10 cable modem won't connect to the DNS server for some reason. I called the modem company technical support line and was connected with a service rep in Asia that didn't speak English well enough to effectively assist me.
Hi Traveler10 your modem should get the DNS server information from your cable provider. You will need to contact the cable provider in order to have them troubleshoot a modem DNS issue.
Hi!
I have been trying to find information whether a DOCSIS 3.1 modem from the US-region would work in Europe?
I know differences between earlier EURODOCSIS and DOCSIS standards but I'm curious to know if modern modems are able to adapt to any environment or is the hardware so fundamentally different (hard to believe) to truly warrant different models?
The reason I'm asking is that the situation with many ISPs here in Europe is such that none that I know of offer a modem only solution. I know many home network builders would prefer a pure modem instead of a wifi modem/router.
I haven't received a clear answer to this even from my ISP and seeing that some modems (like the Technicolor TC4400) have a "dual mode" that lists both DOCSIS 3.1/EURODOCSIS as supported makes me wonder if they would simply work if plugged in :)
I would be very grateful if you could shed some light on this.
Hi Mikko, in many cases there will be a good possibility that the firmware in the modem will be programmed to frequencies and a diplex filter bandwidth that will not be compatible with your cable service provider. There are some modems that will be fully supported, but it would very difficult, even for me to be able to make this determination.
I'm experiencing latency jitter that varies quite a bit but every other ping is a 10+MS spike. The modem shows 1439575373 corrected errors on channel ID 25. These corrected errors seem to keep increasing each refresh of the page. They are sending someone out to check everything which they failed to check today. The guy replaced the modem with basically the same modem as well. What type of problem causes that many errors?
Hi Derektrash8142 correctable and uncorrectable errors maybe caused by the outside plant or in home wiring (like bad connectors and cables). If you have a neighbor with a cable modem see if you can check their modem and if they have errors as well. If they do not, then the root cause is likely bad connectors or cables from the drop to your house or wiring inside your house. You can move your modem closer to the entry of your house and see if errors are reduced. Think "divide and conquer". If your neighbor does have errors too, then its an outside plant issue that will need to be escalated to the cable operator. You can also escalate for your in-home wiring, but I like to try and do some troubleshooting myself just in case I have a bad cable that I can replace on my own.
@@Volpefirm I will do that, I will also mention that on that port 25 (OFDM) there's multiple profiles (Profile 0, 1, 2 & 255) The active profile has 775,066,634 corrected codewords out of 775,170,751 possible.
The other profile 255 is 125 billion out of 126 billion possible corrections. The profile 1 & 0 have little to no corrections. I just find it really weird. They said they're looking into it. The guy who came said he replaced an old cable but it didn't do anything.
Hi volpe my cm 2000 netgear modem is blinking down stream and I keep getting MDD TIMEOUTS
Hi Natural Gaming, your modem likely is not getting enough downstream level - at least that is the most probable issue. Check your cables and connectors. If they are good and snug, you will need to contact your cable operator.
@@Volpefirm get update so my shits working great right now what do you think was happening at the maintenance pol
I had an sb6190, and after 6 months it stopped working today. I had a technician come out and take a look and he said that it was sending electricity through the lines, causing interference. He said to get a new modem, and things should work fine. I got a new one (same type of modem) and it’s still not getting past the second light. When I checked the website, it says the Downstream channel (the first step) isn’t locked. At this point, is it safe to assume its not the modem, but rather the coax or ISP?
Hi @Dat Boi yes it is very seldom that the modem is the problem. Also, modems do not and are not capable of sending electricity down the lines as stated. There are devices called RF chokes that prevent this. So it is very safe to say that it’s not the modem 😖
How do I deal with Pocket Loss everything was OK until I set up my New Docsis 3.1 it seemed ok I lost Connection alright got back on Downstream lighted Green, Upstream light Green
but as soon as I talked to my Cable Provider they say I have Packet Loss all I'm getting is kinda slow Imternet what do I do
Hi Badass, how is your packet loss now? Its been three months since you made this post and cable operators have learned a lot in the past few months about OFDMA. Curious if your problems have improved.
Hey my DOCSIS Event says warning Mimo event mimo you said not to worry sbout this messages but my internet is really bad and i feel like this error means something what do i do
Hi GTA5film - MIMO is indicating whether your modems supports IPv4 or IPv6. This is messaging between the modem and CMTS as regular status updates on the modem can do and does not indicate any problems. Are you seeing any uncorrectable codewords? If not, I recommend you connect your computer to the modem with an Ethernet cable to rule out Wifi issues. If it gets better then you may need to improve your WiFi network.
so my cable modem is an arris router and my problem is that it became slow and scuffy. In my router lights it supposed to have 2 lights, the recieve and send blue light. When it is only 1 blue light the problem starts. I did what i can like resseting the settings and the router. What should i do?
edit: when i check the router settings it is only 1 Upstream Bonded Channel. before the problem it has 4 upstream bonded channel
Hi Charles, when your modem has only 1 upstream channel this may cause slow upstream speeds. If you also have only one downstream, that will cause slow downstream speeds. The modem drops channels due to channel impairments. Rebooting the modem may allow the modem to pickup the channels again until the impairments are fixed. The impairments could be in your house. Be sure to check all connectors and cables from your modem to as far as you can to the cable operator network. Use good connectors and cables and make sure they are tight.
It would be too simple to start by saying look at your DSL-1 & DSL-2 lights and Internet light and see if they are lit, telling you the server is sending something?
They keep making the lights dumber and dumber. Not my fav.
I get 403 Forbidden whenever I try to do this - any suggestions?
Hi Bob, its likely that your cable operator has locked this page out so you can't get access. This has become more frequency since CableHaunt hit last year.
I plugged my PC into my modem (SB8200) and there is no internet connection. What does this mean?
Could be a lot things. I recommend trying a reboot first of the modem, then the PC.
@@Volpefirm sadly there is still no connection. Could it be an issue with the modem?
Hey man I need help ASAP , I have a red globe and my internet isn’t working what should I do
HFC ISPs should straight up just pay you to train their employees on everything DOCSIS, then pay Metageek and Jerry Jongerius / Duckware for WiFi training. No need to reinvent the wheel when experts like yourself explain these kinds of things in amazing detail without getting overly technical.
Thanks 👍
What does it mean when my corrected and uncorrected values are all 0
That means you have no errors. It’s a good thing to see and indicates your modem is performing well 👍
It means its not plugged in yet,
how to do manual firmware update on arris sb8200 ?
Hi and thanks for watching. Firmware updates must be done by your cable provider.
Great information!
Thank you for the feedback and for watching
Hey Volpe! Great video. I'm having a trouble called "SYNC Timing Synchronization failure" - Have you seen this error before and what could it mean?
Hi Calen thanks for watching. The SYNC error message is fairly common. Every 200 msec (that’s 5 times per second) the CMTS sends a SYNCronization message to the modem. If the modem misses one of these messages it throws up that alarm. It’s not a big deal unless the modem goes offline and you see a flood of those messages. So a few here and there is not an issue. A log full of them 5 every second indicates a downstream problem.
@@Volpefirm Thanks! I will keep track of this! Definetly subscribing
All my problems here in Idaho with Spectrum has to do with a system that is over 50 years old. Having my residential service line replaced solved ALL my problems with dropped signal. However, every time it rains my band width drops from 250mbs to less than 10mbs. Every time a tech comes out, they want to blame problems on my in house wifi. They don't know that I have brand new equipment, modem, nest router, laptop. My ethernet connection bandwidth is within 10% of my wifi. I'm convinced technicians don't like climbing ladders. Someone needs to make a video on how to successfully make Spectrum address THEIR system deficiencies.
i have the same modem but i have a speed of 50 mbs download when my service is for 200 mbs download !any idea what s going on ?
Hmmm I have Arris TM822g and the Startup stuff is not shown...
BTW - Great video. My screen though looks a bit different than yous.
Thanks. Often it’s updated modem firmware
i’m having trouble connecting to the internet, my upstream and down stream LED colors are solid blue, my power light and internet light are both solid white, what do i do?
Please let me know the make and model of the modem.
Does entering 192.168.100.1:8080 for the spectrum analyzer works on 3.0? Or that’s a 3.1 feature?
This was introduced on D3.0 modems
@@Volpefirm Didnt work when typed in
Fyi, Comcast sometimes assigns an IP address of 10.0.0.1 or 10.1.10.1 by default when using their "all in one" gateways (which I usually dislike).
Thanks for the comment. I forgot to mention that 192.168.100.1 can be changed by the cable operator.
Hi I have a Arris cable modem I'm getting a T3 and T4 problem how do I fix this? And I only have 2 Upstream channels running when the four I had four
Hi Christopher, what are you seeing in the Cable modem diagnostic screens in terms of downstream power level and downstream MER? Same for upstream transmit level? Also, please record these values over the next day and see if they fluctuate very much. Finally, please see the video I just posted on fixing your internal wiring to make sure you don't have any faulty coax in or around your house.
Hey it's Chris here found out the voltage on the upstream's power was about 54.6 dBmV I live in a apartment complex I went to the main cable central Hub unit found out the connection at the main tap was shorting out fixed it since then I now get all four channels in no more T3 and T4 timeouts. The power now is 40.7 dBmV
@@christophermoriarty7847 How did you know it was shorting out? What did you do to fix it?
Great video. Clear and illuminating.
I’m having TLV-11 unrecognized error and Started Unicast Maintenance every like 30 min my internet completely stops working. How do I fix this?
Hi Raaid, this error often happens when you have a config file that is not correct for your cable modem. Have you contacted your cable operator about the error message?
@@Volpefirm I got it fixed so basically the upstairs cable was bad and we decided to connect to the first floor cable instead and our internet got fixed and it hasn’t gone done in months. I’m guessing the second floor has some wiring problems.
i’m having trouble with my modem, it’s showing blue lights in the middle and white from the outside
Hi Joseline, I'm sorry. Are you still having problems?
What does it mean when your statuses are in progress, in progress, in progress, disabled and denied
Hi Mike, if you are getting a "disabled / denied" status it could be a couple of things. Usually disabled or denied indicated your service has been terminated because you have not paid your bill. However, a new issue has occurred with DOCSIS 2.0 and 3.0 modems where the BPI+ (for security) certificates expired in March and April of 2021. Modems with expired certs will be rejected by the CMTS. If you purchased your own modem many years ago, check with your cable provider and see if this is the issue. You can rent a modem or buy a new one and this will resolve the issue - or check with you cable operator and verify your all paid up.
In 9hrs Uptime on my modem My Uncorrectables were all betwen 60,000 and the highest amout of uncorrectables were 111,675. is there an issue here? I do experience packet loss.. if so what do I do?
I also do need to mention that the highest correctable was only 21,433. ( i have saved screen shots because my modem always crashes and resets this data..)
Hi Seth. What are the total code words? You need to calculate the percentage of code word errors. This is done by the following:
( code word errors / total code words ) x 100
That will give you the percentage. Ideally it should be less than 1%.
I pasted my error message in google and nothing useful came up. I pasted in RUclips and this video came up. Turns out I had a wonky 90-degree/right-angle connector that was of the swivel type which made the outside connector loose af. Since removing it from the equation, no issue! Subscribe for more cable fun facts!
Nice find. The less connectors the better. Less things to go bad or come loose.
Holy wow 45 dB SNR, you off a node+0 system, thats great levels.
Hi Keith, I have my own CMTS for testing purposes, so yes, I get really good SNR (MER). 😀
when suddenlink limits me to 300 gigs per month the hikes up the bill if exceeded
and then i find out my friend who lives in town who also has suddenlink and UNLIMITED data AND HIS BILL IS CHEAPER.
I which i had the drive to harass the crap out of them [ the guy who answered the call i think he gets a pass bc he doesn't have any authority. everyone else is fair game.
I WISH I HAD THE SKILL TO ASK STUPID AND/OR IRRELEVANT QUESTIONS
** Power to cry
** Tell sad storys to manipulate
** Talk someones ear off [truly fascinating sight to see. "they don't want to listen to this."
I feel you. My refrigerator broke recently. 1 month after its warranty ran out. I too wish I had the skill, energy and right questions to harass the refrigerator company to make refrigerators "like they used to". Maybe the same situation, but I get it!
WOW the audio lag....
Its your Internet 🤓
If it has that awful Intel Puma 6 chipset nothing can fix it just throw it in the trash. They almost started a class action lawsuit against them
Hi Tall Guy, we need competition in the market, so having both Broadcom and Maxlinear (Puma) is good. We hope that both companies continue to produce better chipsets moving forward.
I’m having stupid issues with down stream and I just can’t fucking handle this anymore I need help with this shit
*". .troubleshoot your modem...."*
1 ring your provider and spend an hour listening to the message stating how important your call is.
2 Get an interpreter to translate the call agent.
3 Spend vast amounts of time unplugging the ethernet, checking network status and rebooting the modem and all your equipment.
4 Try not harm your neighbour because your stress levels are growing at an exponential rate.
5 Blow your lid as the agent threatens you with call out charges if the problem is found to be with your kit
6 Threaten to move to a new provider if they don't sort your shitty problem out by tomorrow
7 Stand by as you're passed off to the retentions department
8 Repeat everything again to the retentions department.
9 Seethe with rage when the retentions agent says *"... I'm sorry sir, let me put you through to the faults department who can help you with that problem..."*
10 Holding your partner off the ground by their throat isn't good for them, let them go because it's not their fault.
LOL - Thank you for putting a smile on my face today. I may use your list in a future post as it it is all too true. 😂
Going through this right now. There's some hope because the neighbor also has issues. Last tech they sent couldn't fully speak English, and was oblivious to the modem status page. They ignored the thousands of uncorrected errors and the 55dbmv spikes on the upstream channels. They just said the signal looks good, ran a 2 second speed test, then left. Next best thing is to switch ISPs. Now to convince my partner to move their email. Arguing with that tech sounds less stressful.
Troubleshooting, not a tutorial on channels, receive power blabla. Your explaining stuff no one cares about. My units not working, why do I care about mer blabla!
These are not the droids you are looking for