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Vap0rhead's avatar
Vap0rhead
New Contributor

Frequent loss of internet

Have had problems with my internet of the last couple weeks.

Typically, resetting everything, i.e. cable modem and router, will temporarily fix it, just to have it go down an hour or more later. Cox came out and within 10 seconds of entering my home and putting the coax cable in his tester, said signals are good. He suggested I replace my cable modem. I did, and I still have problems.

My signal page has the following levels:

Startup Procedure

ProcedureStatusComment
Acquire Downstream Channel 837000000 Hz Locked
Connectivity State OK Operational
Boot State    
Configuration File OK
Security Enabled BPI+

Downstream Bonded Channels
ChannelModulationFrequencyPowerSNRCorrectablesUncorrectables
1 QAM256 837000000 Hz 5.8 dBmV 40.5 dB 69 0
2 QAM256 843000000 Hz 6.4 dBmV 40.8 dB 38 0
3 QAM256 849000000 Hz 6.0 dBmV 40.7 dB 117 0
4 QAM256 855000000 Hz 6.9 dBmV 40.8 dB 102 0
5 QAM256 885000000 Hz 7.1 dBmV 40.8 dB 307 21
6 QAM256 891000000 Hz 7.3 dBmV 41.2 dB 40 0
7 QAM256 897000000 Hz 7.1 dBmV 41.1 dB 28 0
8 QAM256 903000000 Hz 7.0 dBmV 41.3 dB 16 0

Total CorrectablesTotal Uncorrectables
717 21


Upstream Bonded Channels
ChannelUS Channel TypeSymbol RateFrequencyPower
1 ATDMA 2560 Ksym/sec 38900000 Hz 49.5 dBmV
2 ATDMA 2560 Ksym/sec 22600000 Hz 49.5 dBmV
3 ATDMA 5120 Ksym/sec 27500000 Hz 49.5 dBmV
4 ATDMA 5120 Ksym/sec 34000000 Hz

51.0 dBmV

When I log into the modem, the upstream power is ALWAYS 49+, with usually 50+db. Cox says this is good, but I do not agree.I will also log in and see the modem only will bond to one upstream channel.

I replaced my cable modem, but with the newer cable modem (Surfboard SB6141) had even higher upstream Db than the one it replaced (Zoom 5341J). Seeing as the new modem didn't fix it, I put my Zoom back online.

I restored my router (ASUS RT-N66U) to default firmware as well, no difference.

Any suggestions?

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  • grymwulf's avatar
    grymwulf
    Contributor II

    Here's a FAQ from dslreports that shows the normal DOCSIS 3 range:

    http://www.dslreports.com/faq/3692

    Your TX does look high, at the upper limit of workable.  Most of the people in the industry I've worked with want the TX lower than that due to normal environmental fluctuations that can cause a +/- 2 to 3 point change.