Inconsistent speeds, occasional dropped connection

Hello all,

Ive been going a little nutty trying to figure out if the issue lies with my router (Nighthawk R7000), modem (SB6190), my house, Comcast or some combination. I've tried a few different modems, most recently the SB6190 and the first night the speeds were great but they've been definitely fluctuating. My plan is for 200mbps. Right now I'm seeing around 40. Additionally my modem seemed to lose its connection several hours ago.

Here are the current status numbers. I noticed two channels aren't locked (how many are supposed to be locked?) and there seems to be uncorrectables around those channels:

Startup Procedure
Procedure	Status	Comment
Acquire Downstream Channel		Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+
DOCSIS Network Access Enabled	Allowed

Downstream Bonded Channels
Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Corrected	Uncorrectables
1	Locked	256QAM	16	471.00 MHz	6.00 dBmV	38.98 dB	0	0
2	Locked	256QAM	12	447.00 MHz	6.00 dBmV	38.98 dB	10	0
3	Locked	256QAM	13	453.00 MHz	6.20 dBmV	40.37 dB	10	0
4	Locked	256QAM	14	459.00 MHz	6.20 dBmV	38.98 dB	0	0
5	Locked	256QAM	15	465.00 MHz	6.10 dBmV	38.98 dB	7	0
6	Locked	256QAM	17	477.00 MHz	6.00 dBmV	38.98 dB	0	0
7	Locked	256QAM	18	483.00 MHz	6.20 dBmV	38.98 dB	18	0
8	Locked	256QAM	19	489.00 MHz	6.20 dBmV	38.98 dB	0	0
9	Locked	256QAM	20	495.00 MHz	6.20 dBmV	38.98 dB	6	0
10	Locked	256QAM	21	507.00 MHz	6.00 dBmV	38.61 dB	1	0
11	Locked	256QAM	22	513.00 MHz	6.00 dBmV	38.98 dB	0	0
12	Locked	256QAM	23	519.00 MHz	6.00 dBmV	38.98 dB	2	0
13	Locked	256QAM	24	525.00 MHz	5.90 dBmV	38.98 dB	8	0
14	Locked	256QAM	25	531.00 MHz	5.90 dBmV	38.98 dB	23	0
15	Locked	256QAM	26	543.00 MHz	5.90 dBmV	40.37 dB	9	0
16	Locked	256QAM	27	549.00 MHz	5.90 dBmV	38.98 dB	0	0
17	Locked	256QAM	28	555.00 MHz	6.30 dBmV	38.98 dB	0	0
18	Locked	256QAM	29	561.00 MHz	6.20 dBmV	38.98 dB	0	0
19	Locked	256QAM	30	567.00 MHz	6.20 dBmV	38.98 dB	0	0
20	Locked	256QAM	31	573.00 MHz	6.20 dBmV	38.98 dB	0	0
21	Locked	256QAM	32	579.00 MHz	6.40 dBmV	38.98 dB	0	0
22	Locked	256QAM	33	585.00 MHz	6.60 dBmV	38.61 dB	0	0
23	Locked	256QAM	34	591.00 MHz	6.50 dBmV	38.98 dB	0	0
24	Locked	256QAM	35	597.00 MHz	6.70 dBmV	40.37 dB	4	0
25	Locked	256QAM	36	603.00 MHz	6.70 dBmV	38.90 dB	1	0
26	Locked	256QAM	37	609.00 MHz	6.90 dBmV	39.50 dB	0	0
27	Locked	256QAM	38	615.00 MHz	6.70 dBmV	38.60 dB	242	38
28	Not Locked	----	39	621.00 MHz	----	----	----	----
29	Not Locked	----	40	627.00 MHz	----	----	----	----
30	Locked	256QAM	41	633.00 MHz	7.00 dBmV	33.30 dB	83374	18994
31	Locked	256QAM	42	639.00 MHz	6.80 dBmV	38.90 dB	3	0
32	Locked	256QAM	43	645.00 MHz	6.80 dBmV	39.50 dB	2	0

Upstream Bonded Channels
Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	2	5120 kSym/s	23.70 MHz	39.75 dBmV
2	Locked	ATDMA	4	5120 kSym/s	36.70 MHz	39.25 dBmV
3	Locked	ATDMA	3	5120 kSym/s	30.30 MHz	39.50 dBmV
4	Locked	ATDMA	1	5120 kSym/s	17.30 MHz	39.75 dBmV

Another thing I noticed was that my previous modem (CM600 also had issues at the same frequencies, 615-633 MHz). Is this something a tech would come out and fix?

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Responses

Accepted Solution

RandoCalrissian

New Poster

•

3 Messages

5 years ago

Just following up. Another tech came out today and after I convinced him that there was probably something wrong with the line, he replace the drop line and now all of my channels are locked and I’m getting the speeds I should!

0

EG

Expert

•

111.4K Messages

5 years ago

Yeah. Some of the downstream channels are not locking in. There is probably noise ingressing into the line somewhere at those frequencies. A tech would have the proper testing tool to locate the source.

In the interim, here are some things that you can try;

In a self troubleshooting effort to try to obtain better connectivity, 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.

Good luck !

0

RandoCalrissian

New Poster

•

3 Messages

5 years ago

Thanks, so it sounds like having all of my downstream channels locked is expected.

My cable setup is pretty easy, just a single cable line that comes into the house. No splitters or anything that I can see. I guess I’ll have a tech try to take a look. Why would it be the case that a new modem would be super fast for a few hours then regress again? Does noise “accumulate”?

0

EG

Expert

•

111.4K Messages

5 years ago

Noise ingress is typically variable / intermittent, though it can also be steady.

0

EG

Expert

•

111.4K Messages

5 years ago

Glad that it got straightened out ! Good luck ! Now closing this topic.

0

Your Home Network

RandoCalrissian

Inconsistent speeds, occasional dropped connection

RandoCalrissian

EG

RandoCalrissian

EG

EG

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