Internet cutting out often

[starzen]

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

[EG]

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.

[starzen]

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?

thanks again

[EG]

40 to 45 dB is the preferred area.

[kanick]

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@EG wrote:

... Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, ...

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What are the brand names we should be looking for and from where can we buy them?  Any links appreciated.  Thanks.

[EG]

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