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Forum Discussion

ezicefield's avatar
ezicefield
Follower
Jan 27, 2016

C7000-100NAS randomly drops internet connection

Hello,   My C7000-100NAS modem seems to randomly drop it's Comcast connection. This happen on 2.4 ghz, 5 ghz, and wired connections. There is no pattern, however the dropped connection usually last...
Firmware
Hardware
Troubleshooting
NCsandhills's avatar
NCsandhills
Guide
Sep 08, 2016

I ran the test on "https://www.dslreports.com/speedtest/".  Great testing site, with lots of information.  I experienced the same change in download rates as reported before - initial test was low, second test was per contract with TWC, nearly a 5-fold change in the download rate of the initial try.  So, I still conclude that "If the repeated tests start with low rates and continue to increase, then it is most likely the ISP."  If this is casued by the router/modem - I have yet to determine how/why.

Yoe-F30's avatar
Yoe-F30
Initiate
Sep 08, 2016

Guys,

Don't how but mine got fixed. Has been almost 2 months now without a single drop, at least when I'm at home playing and streaming 4k content. Comcast came and changed all my cables ends and the filter between the post line and the house. Before I was getting -8 dbmv on 3 channels locked. Now is +7.5 dbmv with 16 channel locked for downstream and 3 channels for upstream as before. Don't know if this was the issue as you some off you guys have done it before. Mine got fixed for now. Knock on wood.

 

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel663000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)

 

Downstream Bonded Channels

ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2562663000000 Hz7.4 dBmV39.8 dB4287854929
2LockedQAM2561657000000 Hz7.5 dBmV39.9 dB4696039266
3LockedQAM2563669000000 Hz6.9 dBmV39.7 dB4331322189
4LockedQAM2564675000000 Hz6.7 dBmV38.5 dB4800438624
5LockedQAM2565681000000 Hz6.8 dBmV39.6 dB4285948958
6LockedQAM2566687000000 Hz6 dBmV39.3 dB4632327838
7LockedQAM2567693000000 Hz5.8 dBmV39.2 dB4654356253
8LockedQAM2568699000000 Hz5.8 dBmV39.2 dB4016651342
9LockedQAM2569705000000 Hz5.5 dBmV39 dB4619034510
10LockedQAM25610711000000 Hz5 dBmV38.9 dB4358664671
11LockedQAM25611717000000 Hz5.6 dBmV39.1 dB3859842897
12LockedQAM25612723000000 Hz5.9 dBmV39.2 dB4415037057
13LockedQAM25613729000000 Hz5.4 dBmV39 dB4254456421
14LockedQAM25614735000000 Hz5.6 dBmV39.1 dB3757627004
15LockedQAM25615741000000 Hz6.1 dBmV39.3 dB4338741498
16LockedQAM25616747000000 Hz5.8 dBmV39.2 dB3903352136
17Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
18Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
19Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
20Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
21Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
22Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
23Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
24Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
 

Upstream Bonded Channels

ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA815120 Ksym/sec34800000 Hz43 dBmV
2LockedATDMA825120 Ksym/sec27900000 Hz41 dBmV
3LockedATDMA835120 Ksym/sec21000000 Hz39.8 dBmV
4Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
5Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
 

Current System Time:Thu Sep 08 09:57:55 2016

 

  • NCsandhills's avatar
    NCsandhills
    Guide
    Sep 08, 2016

    Check out this link for details about "power levels".

     

    The specification for downstream power level is -15 dBmV to +15 dBmV for cable modems. A value of -7 dBmV or worse indicates a poor downstream signal path. An installation technician would aim for a value close to the optimal 0 dBmV, but a good cable modem is capable of working within the broader range of -10 to +10 dBmV, provided the downstream Signal to Noise Ratio remains good enough. Additionally all downstream channels should be within a +/-2db window with respect to each other.

     

    http://kb.netgear.com/app/answers/detail/a_id/24311/~/power-level-guidelines-for-a-netgear-cable-modem-router?cid=wmt_netgear_organic 

     

    Looks as if you still have a problem with correctables / noncorrectables.

     

    Try using "https://www.dslreports.com/speedtest" for additional information about how well your connection is working.