Recently it started that our internet keeps dropping for a few minutes. Of course comcasthides behind their covid response and is besides rebooting the modem no help at all.
the log shows the following
Started Unicast Maintenance Ranging - No Response received - T3 time-out
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
16 consecutive T3 timeouts while trying to range on upstream channel 3
No Ranging Response received - T3 time-out
Resetting the cable modem due to docsDevResetNow
1 Locked QAM256 38 423000000 Hz 0.1 dBmV 38.7 dB 202 446 2 Locked QAM256 39 429000000 Hz 0.0 dBmV 38.7 dB 208 588 3 Locked QAM256 40 435000000 Hz 0.0 dBmV 38.7 dB 186 483 4 Locked QAM256 41 441000000 Hz 0.0 dBmV 38.7 dB 172 467 5 Locked QAM256 33 447000000 Hz 0.1 dBmV 38.7 dB 140 383 6 Locked QAM256 34 453000000 Hz 0.0 dBmV 38.6 dB 212 413 7 Locked QAM256 35 459000000 Hz -0.3 dBmV 38.3 dB 237 370 8 Locked QAM256 36 465000000 Hz 0.0 dBmV 38.3 dB 162 366 9 Locked QAM256 1 471000000 Hz -0.2 dBmV 38.2 dB 195 236 10 Locked QAM256 2 477000000 Hz -0.2 dBmV 38.3 dB 192 401 11 Locked QAM256 3 483000000 Hz -0.2 dBmV 38.1 dB 193 343 12 Locked QAM256 4 489000000 Hz -0.1 dBmV 38.3 dB 215 374 13 Locked QAM256 5 495000000 Hz -0.2 dBmV 37.0 dB 213 424 14 Locked QAM256 6 507000000 Hz 0.0 dBmV 36.9 dB 168 350 15 Locked QAM256 7 513000000 Hz 0.0 dBmV 37.7 dB 190 305 16 Locked QAM256 8 519000000 Hz 0.1 dBmV 38.4 dB 226 281 1 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 48.5 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 49.3 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 49.3 dBmV 4 Locked ATDMA 7 5120 Ksym/sec 16400000 Hz 49.3 dBmV
The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
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.
thanks for your answer.
A few years ago we had issues with HD TV and a tech came out and replaced all the splitters
there is a 2 way splitter at the side of the house. one feeds the downstairs and one upstairs.
there is another splitter upstairs that the modem and all upstairs rooms are then connected to.
would be nice without the outside 2 way but i would need to run a cable from the attic downstairs and there isnt an easy way to do that.
it has been working well until very recently. it started cutting out here and there but now it is doing it very frequently to the point where it is almost unusable
i guess one thign i could do is to connect the modem downstairs and see what the numbers look like there just to see if the numbers are better there.
What would be good numbers for upstream power?
40 to 45 dB is the preferred area.
Here are some quality brand splitters that Comcast actually uses in different market areas;
Antronix CMC2002H 2-Way Splitter: http://www.amazon.com/Antronix-CMC2002H-2-Way-Splitter/dp/B001E4OH1E
Regal 2 WAY 1 GHZ Splitter: http://www.amazon.com/DIG702867-Regal-WAY-GHZ-SPLITTER/dp/B0018BQMUM/ref=sr_1_2?s=electronics&ie=UTF...
Extreme Broadband BDS102H 2-Way Digital Coax Splitter: http://www.amazon.com/EXTREME-DIGITAL-PERFORMANCE-CABLE-SPLITTER/dp/B007YV0UQW
Holland 2-way horizontal splitter 5-1000 MHz with ground.http://www.3starinc.com/holland_2-way_horizontal_splitter_5-1000_mhz-w-ground.html
Sv-2g 2-way Splitter 5-1000mhz: http://www.amazon.com/Sv-2g-2-way-Splitter-5-1000mhz-Sv2g/dp/B003TH36CK