Orbi WiFi 7 RBE973
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CM1000 Xfinity issues

Danny80916
Luminary

Re: CM1000 Xfinity issues

So I have a cm1000 modem also my problem is vudu and apple tv both hang on trying to load movies.

Model: CM1000|DOCSIS® 3.1
Message 26 of 79
Neu318
Aspirant

Re: CM1000 Xfinity issues

Similar issue here.  I have a CM600 that is capable of gigabit speed.  I recently switched from Blast to extreme 150.  I'm getting between 80-90Mbps most of the time.  The CM600 has the latest firmware.  After troubleshooting 4 times with their tech support I asked them to send someone to my house.  They said everything looked good but they changed out the line that goes from the house to the pedestal box.  I still get the same speed.  I have an extra CM600 and a SB modem, don't recall model right now.  I'm thinking of swapping out the cm for the other cm and testing.  This is really aggravating.

Model: CM600|CM600 High Speed Cable Modem
Message 27 of 79
martyr444
Apprentice

Re: CM1000 Xfinity issues

For me its not the hardware itself since I have tried all the brands and same results. It may be firmware including the Arris OFMDA which we cannot do anything to change. My specs look good on the modem interface, but I still get up to a million  Uncorrectable Codewords daily. Comcast has changed lines and anything else they can guess at trying. After that doesn't work, they say they are checking the whole area for neighbors that are causing noise. You ask them to get back to you when they find the fix, and then you never hear from them again until you open a case again with the main office and start the vicious cycle all over again. Monopolies are a bad thing...............they quit caring or trying because the money keeps coming in. I send them screen shots when the drops and high pings start up with a command prompt and the modem interface at the same time so they can see these things with their own eyes.

Message 28 of 79
Sloner
Aspirant

Re: CM1000 Xfinity issues

Same problem, I don't get into the millions but hundreds of thousands of errored code words on every locked channel. Have had 5 technicians out in the past 20 days and lines and hardware has been changed multiple times.

Message 29 of 79
Slpope99
Aspirant

Re: CM1000 Xfinity issues

Same issue. I just upgraded to gigabit speed and I cant get more than 400mb down. As the day goes on my speed gets less and less until I reboot. I'm on the latest firmware. I've connect the modem direct to my pc using cat6 and I cant get full speed.
I've called comcast and they reposted the provision with no avail.
Message 30 of 79
vkdelta
NETGEAR Expert

Re: CM1000 Xfinity issues

@Slpope99

 

please post power table and event logs screenshots here.

Message 31 of 79
Slpope99
Aspirant

Re: CM1000 Xfinity issues

TimePriorityDescription
2018-02-21, 21:00:29Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 .;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:01:5c:81:9a:5e;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:01:5c:81:9a:5e;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2018-02-21, 20:59:21Critical (3)Resetting the cable modem due to docsDevResetNow
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:01:5c:81:9a:5e;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2018-02-21, 20:48:19Critical (3)Resetting the cable modem due to docsDevResetNow
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:01:5c:81:9a:5e;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:01:5c:81:9a:5e;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:b9:8a:af:7e:28;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

<tabindex=-1>Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel519000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only

<tabindex=-1>Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM2561519000000 Hz3.0 dBmV41.3 dB25625342600
2LockedQAM2562525000000 Hz3.0 dBmV41.3 dB25635470300
3LockedQAM2563531000000 Hz3.3 dBmV41.2 dB25636383250
4LockedQAM2564537000000 Hz3.4 dBmV41.3 dB25637244800
5LockedQAM2565543000000 Hz3.2 dBmV41.3 dB25638201760
6LockedQAM2566549000000 Hz2.9 dBmV41.1 dB25639173150
7LockedQAM2567555000000 Hz2.8 dBmV40.9 dB25639968700
8LockedQAM2568561000000 Hz3.3 dBmV40.9 dB25638755300
9LockedQAM2569567000000 Hz2.7 dBmV40.7 dB25642063800
10LockedQAM25610573000000 Hz2.8 dBmV40.8 dB25642938600
11LockedQAM25611579000000 Hz3.3 dBmV38.8 dB25643948600
12LockedQAM25612585000000 Hz3.3 dBmV39.7 dB25644839100
13LockedQAM25613591000000 Hz3.5 dBmV40.3 dB25645834000
14LockedQAM25614597000000 Hz3.1 dBmV40.4 dB25646736100
15LockedQAM25615603000000 Hz3.6 dBmV40.5 dB25647658700
16LockedQAM25616609000000 Hz3.2 dBmV40.5 dB25649426100
17LockedQAM25617615000000 Hz3.0 dBmV40.3 dB25650416500
18LockedQAM25618621000000 Hz3.5 dBmV40.4 dB25651357400
19LockedQAM25619627000000 Hz3.7 dBmV39.7 dB25652360900
20LockedQAM25620633000000 Hz4.4 dBmV40.3 dB25653188100
21LockedQAM25621639000000 Hz4.6 dBmV38.9 dB25654126200
22LockedQAM25622645000000 Hz4.6 dBmV37.2 dB25654577800
23LockedQAM25623651000000 Hz4.7 dBmV35.9 dB25655143300
24LockedQAM25624657000000 Hz4.2 dBmV37.8 dB25655667000
25Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
26Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
27Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
28Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
29Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
30Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
31Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

<tabindex=-1>Upstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA135800000 Hz43.8 dBmV
2LockedATDMA229400000 Hz43.3 dBmV
3LockedATDMA323000000 Hz42.5 dBmV
4Not LockedUnknown00 Hz0.0 dBmV
5Not LockedUnknown00 Hz0.0 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

<tabindex=-1>Downstream OFDM Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 125708000000 Hz4.2 dBmV36.0 dB1108 ~ 298726207888181649350
2Not Locked000 Hz2.0 dBmV0.0 dB0 ~ 4095000

<tabindex=-1>Upstream OFDMA Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV

Hardware Version2.02
 
Firmware VersionV3.01.04
 
Cable Modem Serial NumberRemoved 
 
CM certificateInstalled
 
CM MACb0:b9:8a:af:7e:28
 
Message 32 of 79
vkdelta
NETGEAR Expert

Re: CM1000 Xfinity issues

pls post it as screenshot linked to imgur.com or some other site as your columns got cutoff. I cannot see how many uncorrectables in each channel.

Message 33 of 79
Slpope99
Aspirant

Re: CM1000 Xfinity issues

 
Message 34 of 79
vkdelta
NETGEAR Expert

Re: CM1000 Xfinity issues

@Slpope99

 

please PM me. 

Message 35 of 79
jgnoonan
Star

Re: CM1000 Xfinity issues

@vkdeltadoes NetGear have any update on this original issue?  Has Comcast responded to NetGear about these issues?  I have this problem since early November.

Model: CM1000|DOCSIS® 3.1
Message 36 of 79
vkdelta
NETGEAR Expert

Re: CM1000 Xfinity issues

@jgnoonan

 

please PM me your info and I will ask you some questions.

there were some know CMTS Issues performance issues for while (dont think it is still fixed yet) but I would like to get specific customer info to work with Comcast.

 

 

Message 37 of 79
vkdelta
NETGEAR Expert

Re: CM1000 Xfinity issues

@Slpope99

 

I asked admin to delete your personal info. It was deleted within minutes .. as soon I saw it.

 

I have captured your info and will start from there.

Message 38 of 79
martyr444
Apprentice

Re: CM1000 Xfinity issues


@vkdeltawrote:

@Slpope99

 

I asked admin to delete your personal info. It was deleted within minutes .. as soon I saw it.

 

I have captured your info and will start from there.


This is less than one day of errors and my normal uploads should be 12MBPS. This has been going on for a long time and Xfinity cannot figure it out to fix the issue. I also get loads of T3 timeouts. Lots of the time my upload speed will drop to less than 1MBPS.
Modem errors 2-23-2018.JPG2-22-2018 jitter and low upload felt lag.JPG

Message 39 of 79
jgnoonan
Star

Re: CM1000 Xfinity issues

So to all on this thread I think I may be closer to a solution (I hope!)  I was called for a survey on Comcast and left a very angry and detailed reply.  Be aware that most companies use what's called Net Promotor Score (NPS) to rate themselves on customer satisfaction.  It is basically the response to a single question "Would you recommend us to others?"  If you answer that as 0, that gets a LOT of attention.  We use it at my place of work and it is seen at the very highest levels of a corporation.  In any case, I got a call from L2 support (FINALLY) and they said they were seeing issues with the lines.  They sent an engineer out this morning.  I disconnected my router and went straight and my top download speed was 90mbps.  I opened up the modem frequency page and showed him two frequencies with 10s of milliions of uncorrectable codewords.  He went all the way out to the tap on the street and the errors were still there.  He said those three frequencies were really bad and are seriously impacting my speed.  He also said I have a straight line from the tap, under the street and then trenched to the back of my house with no breaks.  He did replace the connectors at both ends because he said they did a crappy job of installing them.

23LockedQAM25622567000000 Hz7.4 dBmV27.8 dB162079794715558615853108
24LockedQAM25623573000000 Hz7.5 dBmV38.3 dB165368988700575512725377

 

He called in a service call because he said there has to be a bad amp somewhere downstream.  They are supposed to have it repaired in the next 24 hours.  He was really pissed off at L1 because he said he looked back at my case and these two frequencies were always a problem and he did not understand why they didn't follow protocol and raise it immediately to L2.  So my advice is don't give up.  Your number of uncorrectable codewords should be low (1200-1500).  Remember, if they survey you and you are still having a problem, answer the NPS question with a 0.  They will then prompt you to leave a message as to why you rated them that way and really let them know how dissatisfied you are.  I will keep you posted. Once they fix this.

Model: CM1000|DOCSIS® 3.1
Message 40 of 79
martyr444
Apprentice

Re: CM1000 Xfinity issues

I'm still getting Modem errors, the numbers are lower now. They found a couple of AT&T connections that weren't in service no more that were left connect causing ingress. There still be firmware changes needed for the Arris CMTS but who know when and if that will ever happen. If you are not persistent and staying on top of the issue, they will never fix it.

Model: CM1000|DOCSIS® 3.1
Message 41 of 79
jgnoonan
Star

Re: CM1000 Xfinity issues

@martyr444 Yeah you're right.  My wife left the house an hour after the Comcast engineer left and another Comcast truck was out and working on one of the ground boxes down the street.  I received a call 30 minutes later saying the repair had been completed.  They wanted me to verify but before I could walk across the room they hung up.  Needless to say both frequencies still are generating millions of unrecoverable code words. and the SNR is under 30.  Comcast called me because I sent a reset signal to the modem.  I actually factory reset the modem and Comcast reprovisioned it.  No dice.  Still the same 2 frequencies with the problem.  The person who called me was from L1 and the conversation went like this:

Comcast: OK sir, let me send a reset signal to your modem

Joe:  I already did that

Comcast:  You may see the modem lights blink off

Joe:  I already did that.  Knock yourself out

Comcast:  Sir, can you now reboot your computer

Joe:  Sure, anything to make Comcast happy

Comcast:  Has the computer restarted yet?

Joe:  You just asked me to do it.  This is Windows 10.  It's installing a bunch of updates.  It may take awhile.

Comcast:  Sir, I am going to put you on mute.  Let me know when the computer has rebooted.

10 minutes elapse

Joe:  OK it's rebooted.

Comcast:  OK Sir, let me walk you through how to do a speedtest

Joe:  I work for IBM, I've been in technology longer than you've been alive.  I know how to run a speedtest

Comcast:  OK Sir, can you open up a browser

Joe:  (rolling his eyes big time)  Yes I think I can manage that.

Comcast:  Is the browser up?

Joe:  Like I said, this is Windows 10.  Browsers don't just come up, you have to wine them and dine them first.

Comcast:  I am not sure I understand.

Joe:  It was a joke.  The browser is up and I have run the speedtest, it's showing 90mbps download.

Comcast:  OK Sir, can you type speedtest.xfinity.com in the browser address bar.

Joe:  (raising my voice)  I already did that.  I told you what the speed was.  90mbps

Comcast:  Sir, that's too low.  You are paying for 150.

Joe:  OK, I am done dealing with you.  You're wasting my time.  I need to talk to someone who knows that they're doing and can do more than read from a script.  Goodbye

 

Ten minutes later, I get a call from a supervisor apologizing all over the place.  They are now sending a "senior technician" (I know them all by name) and they will be there between 3 and 5pm.  I said knock yourself out but I guarantee they won't fix the problem.

 

In the meantime I am trying to download a 12gb file that I needed this morning and overnight the internet went down and shut down my session.  They shut the internet off 4 times trying to fix it and I still have another 4 hours to go before it downloads.  Comcast has rightfully earned it's reputation as the WORST company for customer service.

 

Hope you enjoyed my feeble attempt at humor.  I need to laugh or I am going to break something.

Model: CM1000|DOCSIS® 3.1
Message 42 of 79
martyr444
Apprentice

Re: CM1000 Xfinity issues

 
@ jgnoonan Yes, it can be very frustrating dealing with them and they have received many bad surveys responses from me. I prefer to use speed test like Frontier's speed test because they also give me an idea on how bad the jitter is. I also test for packet loss when issues are going on so I have all that info to throw at them to point them in the right direction for a fix until the next time another issue arises in the vicious cycle. 
Message 43 of 79
Johnson43
Aspirant

Re: CM1000 Xfinity issues

I have been having issues since mid December.  My CM1000 won’t lock on to the network, I was told today that is my problem not Xfinity’s.  I think I’ve had 5 technicians out but nothing has been fixed.  All of the connections have been replaced, I’ve bought 3 new CM100 but none of them work.  How do you update the firmware on the modem?

 

 

This is REALLY frustrating. 

Model: CM1000|DOCSIS® 3.1
Message 44 of 79
jgnoonan
Star

Re: CM1000 Xfinity issues

You can’t. Xfinity pushes down their version of the firmware when they provision the modem. 3.01.04 is the latest
Message 45 of 79
BigQuark
Guide

Re: CM1000 Xfinity issues

I ended up returning my CM1000 to BestBuy and I bought an Arris SB8200 instead. Problem solved. The ISP blamed Netgear, and Netgear blamed the ISP.
Consumer choice is a great thing!!
Message 46 of 79
jgnoonan
Star

Re: CM1000 Xfinity issues

@vkdelta    Update:  Still have the problem.  There are two download frequencies that have a very large number of uncorrectable codewords:  channel 23 frequence 567000000 Hz has a half a billion uncorrectible codewords and channel 24 frequency 573000000 Hz has about 200m.  Comcast is coming back tomorrow because that's all they know how to do.  It is now too late for me to return the CM1000.  I am not going to waste $180 and buy another modem.  It looks like I am just going to have to live with this.  At least I know not to let Comcast con me into getting gigbit Internet service once it's delivered to this area later this year.  I had a brief flicker of hope when the L2 engineer came out to the house but whatever amp the lineman replaced, it didn't fix the problem.  Even complaining on Twitter does no good because they start the "let's send a reset signal to your Modem Mr. Noonan".  I don't think they know any other phrase.

 

This is a pissing contest between Comcast and Netgear and consumers are stuck in the middle.

Model: CM1000|DOCSIS® 3.1
Message 47 of 79
Cygnis
Aspirant

Re: CM1000 Xfinity issues

I'm running Comcast's gigabit service as well as a CM1000 on the latest firmware and not reaching anywhere near my speeds I should be as well.  

 

Just to add my voice to the frustration. 

Model: CM1000|DOCSIS® 3.1
Message 48 of 79
jgnoonan
Star

Re: CM1000 Xfinity issues

Well it is finally fixed.  The tech showed up today and I showed him the two frequencies that were having the problem.  He checked outside, and then at the tap.  He came into the house and said he needed to call a bucket truck in to fix it.  I got a recorded call from Comcast that they were working to fix the issue.  I got a second call an hour later that the issue was fixed.  I ran a speed test and got a consistent 160mbps (yay!).  I used the reset button on the modem and let it re-provision.  All the signal/noise and power levels were good and there were no uncorrectable codewords.  They didn't tell me what they fixed, but at long last, it is fixed.

Model: CM1000|DOCSIS® 3.1
Message 49 of 79
NBCGLX
Guide

Re: CM1000 Xfinity issues

So I have the CM1000 with Comcast's gigabit service. Have never actually received gigabit speeds, and average speed when connected directly to the modem is about 400-500 Mbps. Great speed, sure, but nowhere near the gigabit speed I'm paying for. Highest I've ever seen is about 700 Mbps, and that is for very brief periods of time. For what it's worth, our neighborhood and house are brand new. Comcast has been useless thus far in trying to resolve this. They keep blaming the modem and say I need to use their equipment...event though the CM1000 is certified by their own damn company.

 

EDIT: I'm trying to post screenshots of the modem data, but nothing I'm doing is working. Tried hosting them externally, attaching them here, and tried clicking the Photos button to add them. Nothing works.

Message 50 of 79
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