Intermittant internet

[jl07960]

Two days ago our internet starting disconnecting for a minute, every 10 minutes or so.  Not so great during home schooling times!

I called customer service and they were not helpful.

I looked in the event log on my netgear modem/router (an approved one by xfinity) and there are errors that say the below message.  I saw a lot of messages on here about that error message but do not understand what people actually did to correct it.

Started Unicast Maintenance Ranging - No Response received - T3 time-out

[EG]

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?

[jl07960]

I will get the exact model#, below is a copy and paste of the spot I could find downsream, upstream, and SNR unless there is a specific spot I look for exact numbers?

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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

Procedure Status Comment Acquire Downstream Channel 597000000 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 26 597000000 Hz -14.1 dBmV 36.7 dB 20 0 2 Locked QAM256 27 603000000 Hz -14.9 dBmV 36.2 dB 37 1 3 Locked QAM256 28 609000000 Hz -15.3 dBmV 36.2 dB 33 0 4 Locked QAM256 29 615000000 Hz -15.3 dBmV 36.3 dB 18 0 5 Locked QAM256 30 621000000 Hz -15.3 dBmV 36.3 dB 21 0 6 Locked QAM256 31 627000000 Hz -15.1 dBmV 36 dB 26 6 7 Locked QAM256 32 633000000 Hz -14.6 dBmV 36.7 dB 25 0 8 Locked QAM256 33 639000000 Hz -14.4 dBmV 36.8 dB 32 1 9 Locked QAM256 34 645000000 Hz -14.2 dBmV 36.9 dB 31 0 10 Locked QAM256 35 651000000 Hz -14.4 dBmV 36.7 dB 32 1 11 Locked QAM256 36 657000000 Hz -14.2 dBmV 36.8 dB 16 0 12 Locked QAM256 37 663000000 Hz -13.9 dBmV 37 dB 32 0 13 Locked QAM256 38 669000000 Hz -13.6 dBmV 37.2 dB 16 0 14 Locked QAM256 39 675000000 Hz -13.4 dBmV 37 dB 14 0 15 Locked QAM256 40 681000000 Hz -13.2 dBmV 37.6 dB 29 0 16 Locked QAM256 41 687000000 Hz -13.1 dBmV 37.7 dB 14 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 12 5120 Ksym/sec 17300000 Hz 49 dBmV 2 Locked ATDMA 9 5120 Ksym/sec 36500000 Hz 49 dBmV 3 Locked ATDMA 10 5120 Ksym/sec 30100000 Hz 49.5 dBmV 4 Locked ATDMA 11 5120 Ksym/sec 23700000 Hz 49.8 dBmV

[jl07960]

Netgear AC1600 wi-fi cable modem router model C6250

[EG]

The signals are terrible ! 

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

[jl07960]

I went through my entire line run from outside, got rid of uneeded splitters from past homeowners here, got to the below signals with that downstream ot -5ish but it still craps out intermittantly with the error now "MDD message timeout;CM-MAC=a0:40:a0:31:be:18;CMTS-MAC=00:01:5c:82:96:47;CM-QOS=1.1;CM-VER=3.0;"

Here is the cable connection status:

Procedure Status Comment Acquire Downstream Channel 447000000 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 1 447000000 Hz -5.4 dBmV 40.1 dB 289 697 2 Locked QAM256 2 453000000 Hz -5.4 dBmV 40 dB 28 0 3 Locked QAM256 3 459000000 Hz -5.6 dBmV 40 dB 16 79 4 Locked QAM256 4 465000000 Hz -5.2 dBmV 40.1 dB 27 0 5 Locked QAM256 5 471000000 Hz -5.6 dBmV 40 dB 29 0 6 Locked QAM256 6 477000000 Hz -5.5 dBmV 40 dB 25 0 7 Locked QAM256 7 483000000 Hz -5.9 dBmV 39.9 dB 28 0 8 Locked QAM256 8 489000000 Hz -5.9 dBmV 39.9 dB 26 0 9 Locked QAM256 9 495000000 Hz -6 dBmV 39.8 dB 23 0 10 Locked QAM256 10 507000000 Hz -5.9 dBmV 39.3 dB 26 0 11 Locked QAM256 11 513000000 Hz -6.3 dBmV 39.7 dB 11 23 12 Locked QAM256 12 519000000 Hz -6.4 dBmV 39.7 dB 32 0 13 Locked QAM256 13 525000000 Hz -6.5 dBmV 39.6 dB 30 0 14 Locked QAM256 14 531000000 Hz -6.3 dBmV 39.7 dB 27 0 15 Locked QAM256 15 537000000 Hz -6.4 dBmV 39.7 dB 22 10 16 Locked QAM256 16 543000000 Hz -6.5 dBmV 39.5 dB 28 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 10 5120 Ksym/sec 30100000 Hz 42.5 dBmV 2 Locked ATDMA 9 5120 Ksym/sec 36500000 Hz 42 dBmV 3 Locked ATDMA 11 5120 Ksym/sec 23700000 Hz 42.3 dBmV 4 Locked ATDMA 12 5120 Ksym/sec 17300000 Hz 41.8 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Thu Apr 16 15:13:40 2020

System Up Time:00:34:06

[EG]

Much better but the downstream is still on the weak side, and it may be intermittently fluctuating even lower out of spec. I like to see more wiggle room there. It may be best to book a tech visit for this one.