No Ranging Response received - T3 time-out on Netgear CM700

[killerhertz]

I've been seeing this error for the past couple weeks but we've been plagued by connectivity issues for 2-3 months. I tried using the support chat, but it hasnt' been very helpful - just the usual restart the modem, run a test, etc. I have since upgraded to a mesh WIFI but the packetloss and speed issues persist on both WIFI and wired LAN.

What does this error indicate? It appears almost every day. Restarting the modem appears to help. Is there something I can check or does a tech have to come out? I haven't changed the cabling or anything since this issue arose.

Here is the connection summary:

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables UnCorrectables 1 Locked QAM 256 1 507000000 Hz -10.0 dBmV 37.3 dB 8948 0 2 Locked QAM 256 2 513000000 Hz -10.2 dBmV 37.6 dB 9962 0 3 Locked QAM 256 3 519000000 Hz -10.2 dBmV 36.6 dB 12370 0 4 Locked QAM 256 4 525000000 Hz -10.2 dBmV 36.6 dB 11756 0 5 Locked QAM 256 5 531000000 Hz -10.4 dBmV 36.6 dB 13670 0 6 Locked QAM 256 6 537000000 Hz -10.9 dBmV 37.3 dB 13597 0 7 Locked QAM 256 7 543000000 Hz -11.2 dBmV 36.6 dB 14806 0 8 Locked QAM 256 8 549000000 Hz -12.5 dBmV 36.6 dB 19588 0 9 Locked QAM 256 9 555000000 Hz -12.0 dBmV 36.3 dB 16181 0 10 Locked QAM 256 10 561000000 Hz -11.4 dBmV 36.6 dB 18900 0 11 Locked QAM 256 11 567000000 Hz -10.9 dBmV 36.6 dB 19629 0 12 Locked QAM 256 12 573000000 Hz -10.7 dBmV 36.6 dB 18561 0 13 Locked QAM 256 13 579000000 Hz -11.2 dBmV 36.6 dB 28028 0 14 Locked QAM 256 14 585000000 Hz -10.9 dBmV 36.6 dB 25205 0 15 Locked QAM 256 15 591000000 Hz -11.2 dBmV 36.6 dB 28177 0 16 Locked QAM 256 16 597000000 Hz -11.5 dBmV 36.3 dB 36358 0 17 Locked QAM 256 17 603000000 Hz -11.7 dBmV 36.3 dB 33348 0 18 Locked QAM 256 18 609000000 Hz -11.7 dBmV 36.3 dB 44088 1 19 Locked QAM 256 19 615000000 Hz -11.2 dBmV 36.3 dB 43409 0 20 Locked QAM 256 20 621000000 Hz -11.5 dBmV 36.3 dB 43434 0 21 Locked QAM 256 21 627000000 Hz -11.7 dBmV 36.3 dB 53303 0 22 Locked QAM 256 22 633000000 Hz -12.0 dBmV 35.5 dB 56809 0 23 Locked QAM 256 23 639000000 Hz -12.0 dBmV 35.5 dB 64019 0 24 Locked QAM 256 24 645000000 Hz -12.0 dBmV 35.7 dB 68253 0 25 Locked QAM 256 25 651000000 Hz -12.2 dBmV 35.9 dB 59582 0 26 Locked QAM 256 26 657000000 Hz -12.5 dBmV 35.9 dB 74360 0 27 Locked QAM 256 27 663000000 Hz -12.2 dBmV 36.1 dB 72734 0 28 Locked QAM 256 28 669000000 Hz -12.2 dBmV 35.9 dB 75825 0 29 Locked QAM 256 30 675000000 Hz -12.4 dBmV 35.7 dB 72925 0 30 Locked QAM 256 31 681000000 Hz -12.2 dBmV 35.9 dB 62040 0 31 Locked QAM 256 32 687000000 Hz -12.5 dBmV 35.9 dB 61009 0 32 Locked QAM 256 33 693000000 Hz -12.7 dBmV 35.8 dB 62017 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 85 5120 Ksym/sec 17300000 Hz 50.0 dBmV 2 Locked ATDMA 86 5120 Ksym/sec 23700000 Hz 50.0 dBmV 3 Locked ATDMA 87 5120 Ksym/sec 30100000 Hz 50.0 dBmV 4 Locked ATDMA 88 5120 Ksym/sec 36500000 Hz 49.5 dBmV 5 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV

I dont' have any way to monitor/log these, but whenever I check the modem I get power monitor values within the DOCSIS spec per this link:

http://www.dslreports.com/faq/16085

[CCAndrew]

Using the link you provided, you’ll notice none of your modem levels are “acceptable” SNR is very close too (the higher the better). What kind of wiring setup do you have?

[EG]

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.