Gig1 - Stable but not getting more than about 200MBit - lots of postRS!

[seymansey]

Hi,

I've noticed in the past week or so that my connection has significantly dropped in speed. It's actually quite stable, and i've not really noticed any latecy issues. I only happened upon this issue when I idly ran a wired speed test. 

Some information - note that everything has been tested directly via ethernet!

* I run the Hub 4 modem in modem only mode, connected to a Unifi Dream Machine pro. 

* I 60-second reset the modem back to defaults (thus isolating the unifi equipment) and did a sam-knows test - that topped out at about 200Mbit in the tests I did. 

* Physical connections have been checked, removed and re-tightened.

* I did try the think-broadband test, but it resulted in dropped packets. I guess the unifi threat management is doing its job!

* See router status in next post. Look at all those postRS errors! Even when the router stabilises after a few hours, channels 11 and 12 always have massive counts. 

I think I need an engineer on this one please 🙂

Thanks!

[seymansey]

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

25	331000000	0.500000	38.983261	QAM256	25
6	179000000	-2.500000	37.636276	QAM256	6
7	187000000	-2.599998	38.605377	QAM256	7
8	195000000	-3.400002	37.935909	QAM256	8
9	203000000	-3.099998	38.605377	QAM256	9
10	211000000	-3.500000	33.956509	QAM256	10
11	219000000	-3.500000	26.195726	QAM256	11
12	227000000	-4.400002	24.455643	QAM256	12
13	235000000	-4.500000	38.983261	QAM256	13
14	243000000	-4.400002	38.605377	QAM256	14
15	251000000	-4.500000	38.983261	QAM256	15
16	259000000	-3.299999	38.983261	QAM256	16
17	267000000	-2.799999	38.983261	QAM256	17
18	275000000	-1.900002	38.983261	QAM256	18
19	283000000	-2.400002	38.605377	QAM256	19
20	291000000	-1.700001	40.366287	QAM256	20
21	299000000	-1.500000	38.983261	QAM256	21
22	307000000	-1.000000	38.983261	QAM256	22
23	315000000	-0.400002	38.983261	QAM256	23
24	323000000	0.000000	40.366287	QAM256	24
26	339000000	0.400002	38.983261	QAM256	26
27	347000000	0.500000	38.983261	QAM256	27
28	355000000	-0.700001	38.983261	QAM256	28
29	363000000	-0.299999	38.983261	QAM256	29
30	371000000	-0.400002	40.366287	QAM256	30
31	379000000	-0.099998	40.366287	QAM256	31
32	387000000	-0.400002	38.983261	QAM256	32
34	395000000	0.099998	37.355988	QAM256	34
35	403000000	0.099998	38.983261	QAM256	35
36	411000000	-0.299999	38.983261	QAM256	36
37	419000000	-0.099998	40.366287	QAM256	37

3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

25	Locked	38.983261	2	0
6	Locked	37.636276	42	8
7	Locked	38.605377	60	10
8	Locked	37.935909	51	15
9	Locked	38.605377	46	5
10	Locked	33.956509	6556	34
11	Locked	26.195726	1469667	18795335
12	Locked	24.455643	1515073	18815340
13	Locked	38.983261	8	0
14	Locked	38.605377	37	0
15	Locked	38.983261	37	4
16	Locked	38.983261	23	0
17	Locked	38.983261	20	0
18	Locked	38.983261	19	0
19	Locked	38.605377	13	0
20	Locked	40.366287	1	0
21	Locked	38.983261	2	0
22	Locked	38.983261	0	0
23	Locked	38.983261	0	0
24	Locked	40.366287	0	0
26	Locked	38.983261	0	0
27	Locked	38.983261	0	0
28	Locked	38.983261	0	0
29	Locked	38.983261	0	0
30	Locked	40.366287	0	0
31	Locked	40.366287	0	0
32	Locked	38.983261	0	0
34	Locked	37.355988	366	16
35	Locked	38.983261	0	0
36	Locked	38.983261	0	0
37	Locked	40.366287	0	0

[seymansey]

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

33

96

4K

1880

QAM4096

759

3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

33

Locked

41

-6.4

6966980

0

[legacy1]

Yes TCP when seeing dropped packets limits the speed if all Docsis channels at not 100%

[seymansey]

Bumping for mods to notice. 

[Natalie_L]

Hi seymansey, 

Thank you for reaching out to us here on the Community. 

I am very sorry to hear you are experiencing issues with your broadband. 

I have taken a look from our side and can see there have been some errors detected from our side. 

With this being the case, we will need to investigate further. I am going to pop you over a private message now and this will be available via the purple envelope on the top right of this page. 

Speak soon, 

[Chris_W1]

Hi seymansey, thanks for the message and sorry to hear that you are having issues with the service. 

Would you be able to run a test via Sam knows and speedtest.net and let us know the results. 

Kind regards 

Chris

[seymansey · Accepted solution]

Hi Chris,

Thanks for the message - as per my original post, I had already carried out the samknows test, which topped out around 200Mbps.

I had an engineer around today which was kindly arranged by your colleague. The problem was very clear - a very old and crispy cable underneath my lawn leading to the entry point of my house. That was replaced and I'm back at full speed. 

[Martin_N]

We're glad to hear that has now been resolved for you. 

^Martin