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netgear c7000 combo modem error questions

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netgear c7000 combo modem error questions

i just got this netgear c7000 modem/router unit. and i have 100mbps download speed i pay for and when i do a test using speedtest.net i get 30mbps and then it may go up to 100mbps or not. but my main questions is when i go into the event logs i see 1,000's of errors for rainging.  now i did see them with the c3700 modem i just replaced but that modem also gave me tons of this site is not safe and also my phones and tablets could not connect to the internet. i think i had a power spike after an outage.

this is what i see in the basic cable connection page.

 

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 345000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD honorMdd(4)
 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 33 345000000 Hz 3.4 dBmV 41.9 dB 1 0
2 Locked QAM256 34 351000000 Hz 3.3 dBmV 41.8 dB 0 0
3 Locked QAM256 35 357000000 Hz 3.1 dBmV 41.7 dB 1011 3671
4 Locked QAM256 36 363000000 Hz 3 dBmV 41.7 dB 1080 3862
5 Locked QAM256 1 369000000 Hz 2.9 dBmV 41.4 dB 4381 22182
6 Locked QAM256 2 375000000 Hz 2.9 dBmV 41.6 dB 1153 4492
7 Locked QAM256 3 381000000 Hz 3.1 dBmV 41.7 dB 3887 7071
8 Locked QAM256 4 387000000 Hz 3.1 dBmV 41.9 dB 3002 6230
9 Locked QAM256 5 393000000 Hz 3.2 dBmV 42 dB 2978 6432
10 Locked QAM256 6 399000000 Hz 3.2 dBmV 41.9 dB 2938 6232
11 Locked QAM256 7 405000000 Hz 3.1 dBmV 42 dB 2873 6347
12 Locked QAM256 8 411000000 Hz 3 dBmV 41.9 dB 2895 5942
13 Locked QAM256 9 417000000 Hz 2.8 dBmV 41.7 dB 2881 5853
14 Locked QAM256 10 423000000 Hz 2.8 dBmV 41.7 dB 2815 6109
15 Locked QAM256 11 429000000 Hz 2.8 dBmV 41.5 dB 2961 5514
16 Locked QAM256 12 435000000 Hz 3 dBmV 41.7 dB 3015 5607
17 Locked QAM256 13 441000000 Hz 3.3 dBmV 41.9 dB 0 0
18 Locked QAM256 14 453000000 Hz 3.5 dBmV 42.4 dB 0 0
19 Locked QAM256 15 459000000 Hz 3.4 dBmV 42 dB 0 0
20 Locked QAM256 16 465000000 Hz 3.1 dBmV 42 dB 0 0
21 Locked QAM256 17 471000000 Hz 3 dBmV 41.9 dB 0 0
22 Locked QAM256 18 477000000 Hz 2.7 dBmV 42 dB 0 0
23 Locked QAM256 19 483000000 Hz 2.5 dBmV 41.8 dB 0 0
24 Locked QAM256 20 489000000 Hz 2.7 dBmV 41.9 dB 0 0
 
Upstream Bonded Channels (Partial Service)
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 25800000 Hz 38.5 dBmV
2 Not Locked Unknown 2 0 Ksym/sec 19400000 Hz 0.0 dBmV
3 Not Locked Unknown 3 0 Ksym/sec 14600000 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Extended Upstream Transmit Power
Enable Extended Upstream Transmit Power

 

 

this is the advance admin event log

 

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=a0:40:a0:39:76:b0;CMTS-MAC=00:01:5c:71:3e:5b;CM-QOS=1.1;CM-VER=3.0;

 

 

16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=a0:40:a0:39:76:b0;CMTS-MAC=00:01:5c:71:3e:5b;CM-QOS=1.1;CM-VER=3.0;

 

so what might i have to do that get this fixed it it is a real issue?

 

i did have this on the c3700 modem at the end but i may have had it all along as i did not ever look for these logs untill i started to get those messages when i was browsing and the this site is not safe started to show.  then i started  looking at these logs trying to understand the errors i got last week with a failing modem. 

 

this modem i have now the c7000 came from ebay and it very well could be bad.  the next step i guess will be to get a comcast modem and then when the tech installs it have him check the event log and the other logs in that section and if it shows these same issues have him fix it. then rent the modem for a bit and then go back to my own modem. that way if the rental has no errors i can figure the lines are good all the way back to the head end?   correct? thanks

 

 

 

 

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Diamond Problem Solver

Re: netgear c7000 combo modem error questions

You’re missing 2 upstream channels. You should have 3 or possibly 4, depending on your market. Either your modem isn’t reading them or maintenance has put a high pass filter on your drop (to fix ingress/noise/interference). Try your previous modem and see if those channels are there

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Re: netgear c7000 combo modem error questions

the other modem they were not there either so how can i get this fixed? i was on the phone with tech trying to get this modem connected and they did not notice that, but they did have a time with connections..

 

when i look at the basic-cable connections where is show all the connections i see tons of correctibles. so what ar those? and can i n=move the starting frequency around to make thst correctibls go away? or is that given to  me by the cable company?  

 

my last modem i think got spiked eith by a power outage 2 weeks ago or by me when i was testing the breakers for installing a generator, and i turned off the breaker to themodem a few times in a row and i may have spiked it. it is on a surge protector power strip, but a spike may have got thru. or that modem just failed.  but after that failure started and i was getting just about every time i went to any site on the internet, i got this site is not safe and i got blocked. 

i thought comcast at that time put a block on my internet but i did get thru somtimes. the last time they put a filter/block on my internet, i still got cable but no internet and they said i was broadcasting. i do not understand that as i have one line from the pole tap to the house ground block and then on into the house to the modem. at that point they put in a splitter that has the output taps that say -3.5 on them. one goes to the tv and one goes to the modem.  i did take the cable off that splitter and connected the modem thry a barrel connector to the modem and nothing changed, so i figure that splitter is still good. in fact when i cleared the logs and they came back the same. and then i turned off the modem to reset it and they were the same.

 

they told me i have 1 upstream becasue i have 5mbps upstream, that was the same with the other modem, that modem had 8x4  the new modem has 24x8  and i do see the 24 channel down but still 1 up. thanks

 

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Diamond Problem Solver

Re: netgear c7000 combo modem error questions

Basically, have a tech out and look for a high pass filter. Unless, it’s your equipment that’s not reading those channels. You should have at least 3 regardless of speed. It’s not something that will get fixed over the phone

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Re: netgear c7000 combo modem error questions

ok thanks i will start a chat with comcast and have them send out a tch to get this fixed. like i said i have the cable companys cable from the tap on the pole to the ground block. that is a bit thicker than the rest that goes from the tap all the way to the splitter above the modem. that cable is a bit smaller. i do not remember the cat size now, and the tap was installed by the tech years ago.

 

on thing i just did was take the cable out of the staples i had it fastened to the floor joists. i cleared the errors and they came back just as fast. 

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=a0:40:a0:39:76:b0;CMTS-MAC=00:01:5c:71:3e:5b;CM-QOS=1.1;CM-VER=3.0;

so taking the wire off the staples did nothing so that was not this issue. the staples were not crimpling the wire the cable was loose in those, what i will do is drill holes now and just run that cable thru the floor joists and that should take that out of the picture. 

 

also i still have that splitter in there that they installed way back like 20 years ago it has a -3.5 on the output ports. i did swap them from the tv and that made no difference.

 

on thing is my cable goes from the ground lug down the metal siding all the way along the house and a few bends under windows and then up the corner and then into the garage where it then follows the sheetrock and then thru the floor joist to the splitter, once it got into the house i did staple it to the underside of the joists, but my stapler did not pinch the wire.  

 

i do have on of those ota antenna signal meters will that tell me the signal i have at the ent of the cable before it goes into the modem? or can i test that power with my dvm? and if i can what setting would i use? but being the modem tells me i have like 3.5 dbmv there on down and 38.5 dbmv up but only 1 us channel

 

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Diamond Problem Solver

Re: netgear c7000 combo modem error questions

Try bypassing that splitter and see if the channels come back

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Re: netgear c7000 combo modem error questions

i did and it did not change when i did that a few days ago.  also i just had the cable off the modem for like 30 minutes as i drilled holes in the floor joists and re ran the cable thru them and back to the modem. this time i did not put any bends, i pushed the 3' extra cable up into the support for the floor joists and that gave it a relaxed curve. and i did chack the cable for nicks and nothing out of the ordanary.  i do have some rg6 form the cable company my brother gave me and i'm leaning on running that from the ground block thru the house, istead of along the aluminum siding like they did.

anyway after i reconnected the cable back and the modem came back online almost instantly the errors all came back.  so it is either the modem of which i'm not thinking is causeing that as the old failing modem ahd the exact same issue. so i'm goint to start a chant sith comcast and schedule a high level tech to stop out and fix it. unless they tell me they can't fix it. then i may just cancel cable and go with frountier. as i already use ota for tv and on the cable box all i get is the same channels. and believe it or not when the ots is out so it the same cable channels. i only have the cable because it was cheaper for the bundle that just internet.

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Expert

Re: netgear c7000 combo modem error questions

FWIW, noise ingress into the lines / return path somewhere can also cause the un-bonding of the upstream channels. 

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

 

You can call in to Customer Service and ask a rep about them. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. Good luck !



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Re: netgear c7000 combo modem error questions

thanks. now after i just did all this whish was nothing more than re route the cable now my speed is down to 30mbps.   i checked the connection and i have 0 correctibles and uncorrectibles so this looks good. 2.7 to 3.0 dbmv on all 24 down channels and 35.8dbmv on the up channel i have.

 

but still getting all those errors. tons of them.

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=a0:40:a0:39:76:b0;CMTS-MAC=00:01:5c:71:3e:5b;CM-QOS=1.1;CM-VER=3.0;

 so liek i said i will start a chat and ask for a tech to stop out and go to the pole and see if i have a filter or if they can figure out why i'm getting all those errors. 

 

i get 35mbps on speedtest.net but 115 on comcast so what one is the truth? i guess the speed is not that important as i seem to be getting all the sites fast for me. but i pay for 100mbps so it seems i should be getting that. and i have a modem that comcast tells me is capible of 856 mbps  thanks

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Expert

Re: netgear c7000 combo modem error questions


@corvairbob wrote:

 

i get 35mbps on speedtest.net but 115 on comcast so what one is the truth?


The reason that their *in house* speed tests show faster speed is because their speed testing servers lie on *their* network's edge, therefore they are not subject to any third party's potential backbone deficiencies / routing deficiencies / distance related latency issues etc;

https://www.dslreports.com/forum/r31251250-



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Re: netgear c7000 combo modem error questions

when i was on the phone last night with the tech they made me go to comcast's speed test not the speedtest.net. they said the comcast speed test was all they can go by.  i just now did the comcast test and i get 92mbps out of the 100mbps i pay for. then on the speedtest.net site i get 25mbps.  

 

i still have 0 correctibles and un correctibles so that is good. maybe all those errors i'm seeing are not that important if i get online and everything i do seems normal. so maybe i'm messing with things that are of no realavance to me? but ihave 30 day to keep this modem and that is one reason i'm after it because if it turns out to be bad i need to return it before the 30 days are up or i'm out 150$ that i do not want to eat for a bad modem. thanks

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Re: netgear c7000 combo modem error questions

ok this is what i did. i can't say that it is the 100% fix yet only time is going to tell .  

based on the reply form  eg entered below my reply,  i got a kit that lets me reterminate the cable ends. to what comcast used. now theya re all the same from the pole to the device and tv.  

 

then after about 8 hours it seemed to reset and now it is working ok speed back up and steady at 120mpbs

 

 ed's reply thanks ed.

FWIW, noise ingress into the lines / return path somewhere can also cause the un-bonding of the upstream channels. 

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

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Expert

Re: netgear c7000 combo modem error questions

O/k good. Hope things hold up for you ! Marked "answered" thread now being closed. Please post back with a new topic if the issue returns.



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