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CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

lordhung
Aspirant

CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

I think I posted on wrong forum- re posting here:
 
Spectrum Ticket: 33699396
 
 

Just got my modem 3 days ago and set it up.  Had a Spectrum tech come out yesterday and took out extra splitters and checked all my signals.  I don't think it made much a difference.  My upstream power hovers around 51-52 dB so any flucutations to that spikes it over 53 dB and causes a T3 error and disconnect.

 

Almost every Spectrum rep wants to blame my for using my own equipment, even though I had this problem with my old modem and bought this modem to upgrade.  I just had it re-provisioned this morning after a factory reset of the modem and the issue is still happening.

 

My coax is running straight from a grounding box to my outlet, then to a splitter that goes to my HD-DVR box and my modem.  There was am amp there before that the tech took out yesterday; he said it was bad.  However, before the tech visit and after, I did not see a noticable change in upstream power. 

 

Is there anything I can do?  Would exchanging the modem for another CM1100 have any difference?  I'm not sure it would, as when there is connection, the model works great, but the disconnects happen sometimes every minute.

Model: CM1100|Nighthawk Multi-Gig Speed Cable Modem—DOCSIS 3.1
Message 1 of 7
FURRYe38
Guru

Re: CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

The user of High Power signals on the line are probably one issue. 
The CM1100 is a solid modem if the signals are set right. The ISP should know this. 

 

Message 2 of 7
lordhung
Aspirant

Re: CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

Modem Status:

Apply             Cancel    
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency

 

ProcedureStatusComment
Acquire Downstream Channel777000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv4 only

ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25628777000000 Hz-3.4 dBmV42.0 dB11562486319602806
2LockedQAM2561615000000 Hz0.2 dBmV43.6 dB11448263047596042
3LockedQAM2562621000000 Hz0.5 dBmV43.4 dB11448028847555886
4LockedQAM2563627000000 Hz0.4 dBmV43.8 dB11448490343695681
5LockedQAM2564633000000 Hz-0.2 dBmV43.5 dB11448886541345424
6LockedQAM2565639000000 Hz0.0 dBmV43.7 dB11449265940215240
7LockedQAM2566645000000 Hz0.0 dBmV43.5 dB11449591939175175
8LockedQAM2567651000000 Hz-0.2 dBmV43.4 dB11449961238515067
9LockedQAM2568657000000 Hz-0.6 dBmV43.4 dB11450292436544684
10LockedQAM2569663000000 Hz-0.8 dBmV43.3 dB11450793235054461
11LockedQAM25610669000000 Hz-0.9 dBmV43.1 dB11451211035174279
12LockedQAM25611675000000 Hz-1.5 dBmV42.6 dB11451578633044310
13LockedQAM25612681000000 Hz-2.1 dBmV42.6 dB11451967733174263
14LockedQAM25613687000000 Hz-1.7 dBmV42.6 dB11452332531294266
15LockedQAM25614693000000 Hz-1.5 dBmV42.6 dB11452660731814094
16LockedQAM25615699000000 Hz-1.7 dBmV42.5 dB11453188731573861
17LockedQAM25616705000000 Hz-1.9 dBmV42.2 dB11453543530724596
18LockedQAM25617711000000 Hz-1.4 dBmV42.3 dB11454011228023708
19LockedQAM25618717000000 Hz-0.9 dBmV42.7 dB11454432426553504
20LockedQAM25619723000000 Hz-1.5 dBmV42.6 dB11454819624973442
21LockedQAM25620729000000 Hz-1.6 dBmV42.5 dB11455205724643434
22LockedQAM25621735000000 Hz-1.4 dBmV42.9 dB11455602023453271
23LockedQAM25622741000000 Hz-1.3 dBmV43.0 dB11456020721263014
24LockedQAM25623747000000 Hz-1.9 dBmV42.8 dB11456375923962999
25LockedQAM25624753000000 Hz-2.2 dBmV42.6 dB11456768020273026
26LockedQAM25625759000000 Hz-1.9 dBmV42.8 dB11457179521312969
27LockedQAM25626765000000 Hz-2.2 dBmV42.8 dB11457559320622805
28LockedQAM25627771000000 Hz-2.7 dBmV42.4 dB11457991620062881
29LockedQAM25629783000000 Hz-2.6 dBmV42.6 dB11460360219112843
30LockedQAM25630789000000 Hz-2.3 dBmV42.7 dB11458799517192595
31LockedQAM25631795000000 Hz-2.8 dBmV42.3 dB11459133516892554
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

<Upstream Bonded Channels (Partial Service)<

ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA117600000 Hz51.3 dBmV
2LockedATDMA224000000 Hz52.8 dBmV
3LockedATDMA330400000 Hz58.8 dBmV
4LockedATDMA436800000 Hz53.3 dBmV
5Not LockedUnknown00 Hz0.0 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

Downstream OFDM Channels

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 255159848000000 Hz-3.0 dBmV39.8 dB1108 ~ 298730128183521015473925
2Not Locked0, 25500 Hz1.9 dBmV0.0 dB0 ~ 4095000

Upstream OFDMA Channels

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV

 

Model: CM1100|Nighthawk Multi-Gig Speed Cable Modem—DOCSIS 3.1
Message 3 of 7
plemans
Guru

Re: CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

The 58dbmv would cause issues on the line. 

Spectrum would need to recheck the line. They fight checking lines. 

I've actually had to rent one of their modems to prove to them it wasn't the "third party" device and get them to fix a line. Then once its fixed, going back to my own modem. 

Message 4 of 7
lordhung
Aspirant

Re: CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

So a tech came today and checked everything from the pole drop to the modem line.  Replaced pole connectors, the tech who came yesreday forgot to crimp a fitting smdh.

 

However, there is an issue with the modem too.

 

I still have my old modem so I hooked and rehooked it up to compare the 12 year old SBG6580 and the 3 day old CM1100.

 

Why is there an extra 2-3 dBmV on the CM1100?  Is this normal or do I have a bad modem?

 

SBG6580:

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1LockedQAM2561615000000 Hz3.3 dBmV42.0 dB00
2LockedQAM2562621000000 Hz3.3 dBmV42.5 dB00
3LockedQAM2563627000000 Hz3.4 dBmV42.0 dB00
4LockedQAM2564633000000 Hz2.9 dBmV41.9 dB00
5LockedQAM2565639000000 Hz2.5 dBmV41.9 dB00
6LockedQAM2566645000000 Hz2.9 dBmV42.0 dB00
7LockedQAM2567651000000 Hz2.6 dBmV42.0 dB00
8LockedQAM2568657000000 Hz2.2 dBmV41.4 dB00

 

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA25120 Ksym/sec24000000 Hz47.0 dBmV
2LockedATDMA15120 Ksym/sec17600000 Hz46.2 dBmV
3LockedATDMA35120 Ksym/sec30400000 Hz47.7 dBmV
4LockedATDMA45120 Ksym/sec36800000 Hz48.2 dBmV

 

CM1100:

 

Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency

Startup Procedure

ProcedureStatusComment
Acquire Downstream Channel759000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv4 only

Downstream Bonded Channels

ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25625759000000 Hz0.0 dBmV40.5 dB6268337800
2LockedQAM2561615000000 Hz2.1 dBmV43.3 dB6172461300
3LockedQAM2562621000000 Hz2.2 dBmV43.3 dB6172786400
4LockedQAM2563627000000 Hz2.0 dBmV43.2 dB6173161700
5LockedQAM2564633000000 Hz1.5 dBmV42.9 dB6173474500
6LockedQAM2565639000000 Hz1.6 dBmV43.1 dB6173655200
7LockedQAM2566645000000 Hz1.4 dBmV43.0 dB6174190100
8LockedQAM2567651000000 Hz1.2 dBmV42.7 dB6174604600
9LockedQAM2568657000000 Hz1.1 dBmV42.7 dB6174929700
10LockedQAM2569663000000 Hz0.9 dBmV42.4 dB6175285900
11LockedQAM25610669000000 Hz0.9 dBmV42.4 dB6175632400
12LockedQAM25611675000000 Hz0.5 dBmV41.6 dB6176162100
13LockedQAM25612681000000 Hz0.3 dBmV42.0 dB6176477800
14LockedQAM25613687000000 Hz0.6 dBmV41.6 dB6176853300
15LockedQAM25614693000000 Hz0.6 dBmV41.0 dB6177303000
16LockedQAM25615699000000 Hz0.3 dBmV40.6 dB6177669600
17LockedQAM25616705000000 Hz0.0 dBmV40.1 dB61778387211867
18LockedQAM25617711000000 Hz0.4 dBmV39.8 dB61783098118494
19LockedQAM25618717000000 Hz0.7 dBmV40.0 dB6178768500
20LockedQAM25619723000000 Hz0.1 dBmV40.3 dB6179114800
21LockedQAM25620729000000 Hz-0.1 dBmV41.3 dB6179442100
22LockedQAM25621735000000 Hz0.1 dBmV42.2 dB6179830200
23LockedQAM25622741000000 Hz0.3 dBmV41.6 dB6180255600
24LockedQAM25623747000000 Hz-0.2 dBmV40.7 dB6180596100
25LockedQAM25624753000000 Hz-0.3 dBmV40.4 dB6181000910
26LockedQAM25626765000000 Hz-0.1 dBmV40.6 dB6181354900
27LockedQAM25627771000000 Hz-0.6 dBmV40.4 dB6181716000
28LockedQAM25628777000000 Hz-1.3 dBmV40.4 dB6181038737946724
29LockedQAM25629783000000 Hz-0.5 dBmV40.9 dB6182055422651617
30LockedQAM25630789000000 Hz-0.2 dBmV40.9 dB6182520400
31LockedQAM25631795000000 Hz-0.9 dBmV40.6 dB6182780200
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

Upstream Bonded Channels

ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA117600000 Hz49.5 dBmV
2LockedATDMA224000000 Hz50.5 dBmV
3LockedATDMA330400000 Hz50.5 dBmV
4LockedATDMA436800000 Hz51.0 dBmV
5Not LockedUnknown00 Hz0.0 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

Downstream OFDM Channels

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 255159848000000 Hz-1.0 dBmV39.5 dB1108 ~ 29871619675201114236130
2Not Locked0, 25500 Hz5.5 dBmV0.0 dB0 ~ 4095000

Upstream OFDMA Channels

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV

 

Model: CM1100|Nighthawk Multi-Gig Speed Cable Modem—DOCSIS 3.1
Message 5 of 7
plemans
Guru

Re: CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

Your signal power levels are entirely within spec now. It could be because you're going from 2 different manufacturers. or going from a 8x4 modem to a 32x8 modem with docsis 3.1. 

tough to say exactly. 

Message 6 of 7
FURRYe38
Guru

Re: CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

Take the CM modem back and get it replaced. Possible faulty modem you have. 

Message 7 of 7
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