This topic

Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 18:48:48 GMT

Hi All

I am having a mare and wondering if someone can help my downstream snr is stuck at 8db i want it lowered had 2 engineer visits neither wanted to do it because im getting 67meg

Ive lived in the flat upstairs 3db for 2 years no issues.

Please help

Product name:

BT Hub 6A

Serial number:

+084316+NQ74439782

Firmware version:

SG4B1000E020

Firmware updated:

12-Jan-2021

Board version:

1.0

Gui version:

1.115.0

DSL uptime:

0 Days, 6 Hours 16 Minutes 59 Seconds

Data rate:

20.00 Mbps / 80.00 Mbps

Maximum data rate:

26025 / 90949

Noise margin:

9.6 dB / 8 dB

Line attenuation:

20.9 dB

Signal attenuation:

13.6 dB / 20.9 dB

VPI / VCI:

0/38

Modulation:

G_993_2_ANNEX_B

Latency type:

Fast Path

Data sent / received:

695 MB Uploaded / 2 GB Downloaded

Broadband username:

bthomehub@btbroadband.com

BT Wi-fi:

Active

2.4 GHz wireless network name:

BTHub6-7R9C

2.4 GHz wireless channel:

Smart (Channel 6)

5 GHz wireless network name:

BTHub6-7R9C

5 GHz wireless channel:

Smart (Channel 36)

Wireless security:

WPA2 (Recommended)

Wireless mode:

Mode 1

Firewall:

MAC address:

A0:39:EE:67:3F:95

Software variant:

Boot loader:

9.2.0

Re: Openreach wont drop SNR

licquorice — Tue, 16 Feb 2021 18:55:57 GMT

Your SNR is high because you are receiving the maximum speed possible 80M.

Re: Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 18:57:57 GMT

Yeah but i had the same in the upstairs flat and managed to get it lowered.

Re: Openreach wont drop SNR

licquorice — Tue, 16 Feb 2021 19:00:12 GMT

You are at the maximum speed for fibre 2. SNR figure is totally irrelevant.

Re: Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 19:03:08 GMT

Im not because my throughput is 71 meg. I did say!

Re: Openreach wont drop SNR

licquorice — Tue, 16 Feb 2021 19:17:41 GMT

Your sync speed is 80M, the maximum for fibre2, and governs the SNR figure. Throughput will always be lower than sync speed and has nothing to do with SNR.

Re: Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 19:25:35 GMT

Then how come when I got it lowered to 3db I hit 75 meg? I know what I’m after I’m sick of going around in circles!

Re: Openreach wont drop SNR

licquorice — Tue, 16 Feb 2021 19:31:35 GMT

I can assure you SNR is only related to sync speed and not throughput and as you are syncing at maximum speed it is totally irrelevant. It is impossible to lower it.

Re: Openreach wont drop SNR

imjolly — Tue, 16 Feb 2021 19:35:06 GMT

As @licquorice has said your noise margin is high at 8db and is correct as you have max connection speed of 80mb but a far higher attainable speed. You will not get a lower noise margin unless your difference in speed between actual and attainable reduces.

Re: Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 20:00:43 GMT

Sorry but that’s bs because 74 meg on 4db what I got in the flat upstairs last summer... same bloody junction box.

this is what frustrates me... lower the SNR. Job done.. what’s so hard about it!!

Re: Openreach wont drop SNR

licquorice — Tue, 16 Feb 2021 20:20:15 GMT

It is not possible to change the laws of physics

Re: Openreach wont drop SNR

bkehoe — Tue, 16 Feb 2021 20:22:38 GMT

The flat upstairs had a far worse quality phone line. Without decreasing the quality of your phone line you will not lower the SNR.

SNR stands for 'Signal to Noise Ratio'. Read that phrase and tell us why you think less signal/more noise is better.

Re: Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 20:35:17 GMT

How was the line worse? it was exactly the same!! I managed to get one Openreach guy to do this last summer. He rang up the helpdesk, requested the 3db I was after. Bam I went up from 71 meg to 74 meg. Standard SNR is 6 always, Unless Talk Talk I know like to use 9db.

I would post a screenshot but the image is too large. But trust me when I say what I am saying.. You lower the SNR to 3db you get more speed. May not seem alot but when your in the sticks like me you will grab anything offered.

Look I get what all of you are saying but your completely missing my point... When I have been put on a profile that is able to get 73.7meg I expect 73.7 meg... not 67, 70. I want 73.7 meg.

Anyway.. Got an engineer coming Friday so hopefully 3rd time lucky!

Re: Openreach wont drop SNR

licquorice — Tue, 16 Feb 2021 20:49:45 GMT

@bkehoe wrote:

SNR stands for 'Signal to Noise Ratio'. Read that phrase and tell us why you think less signal/more noise is better.

Except the figure is SNRm Signal to Noise Ratio Margin, however, the fact remains that when sync speed is at the maximum possible, by definition the SNRm is at its mimimum. End of.

Re: Openreach wont drop SNR

imjolly — Tue, 16 Feb 2021 20:56:23 GMT

Look forward to new stats with a 3db noise margin

Re: Openreach wont drop SNR

samtheaspie — Tue, 16 Feb 2021 22:41:04 GMT

Will post them when I can

Re: Openreach wont drop SNR

Gary_C — Wed, 17 Feb 2021 06:28:44 GMT

This got nasty quickly 😘

Anyway, what they are trying to say is, the system is happy that it has set your line at the maximum achievable speed that you have paid for and will refuse to lower the signal to noise ratio margin as it doesn't see any need to do so.
Your hub stats show that you have a rate of 80mbps so the DLM is not going to lower your SNRM any more.

Data rate:

20.00 Mbps / 80.00 Mbps

You are getting the maximum speed you are allowed to get to the modem

Maximum data rate:

26025 / 90949

You can't get these speeds, but in theory the link could operate up to them, so there is quite a big margin between your sync speed and the maximum theoretical speed, and therefore quite a big SNRM. For people with bad lines, the system would lower the SNRM to try to push the attainable closer to the maximum, but yours doesn't need to.

Now you say that your not getting the speed you had upstairs and there the SNRM was lower. These are two slightly different questions.
I imagine your DLM still achieved 80mbps sync but had to lower the SNRM more due to a slightly noisier line.
Now, as to why you are getting different measured speeds, dont know. As your hub stats are showing, you are connected at 80mbps and the measured speed will always be lower due to overheads of the equipment. Are you using the same modem/route, same speed measuring software, same computer ?

But, at the end of the day, you are getting a far better VDSL broadband speed than 80% of the country and to be honest the extra speed you think you are loosing would hardly be noticeable.

Re: Openreach wont drop SNR

samtheaspie — Wed, 17 Feb 2021 08:07:11 GMT

Finally a sensible answer, needless to say it didn’t need to get nasty, I just can’t stand people not listening to me, I know what I am talking about as I work in IT and have networking qualifications.

The only reason why I’m asking for the extra speed is because I live in the sticks, when you live in a rural area which is often forgotten about due to big cities getting all the attention, making your line noiser to gain extra speed is sometimes worth it.. nevertheless I’m trying to push for the the rural gigabit scheme for my village.

I know there’s a lot of crosstalk on my line too. But anyway thanks for your reply.

Re: Openreach wont drop SNR

JohnC2 — Wed, 17 Feb 2021 12:05:50 GMT

Hi All, please remember to keep your posts friendly.

cheers
John

Re: Openreach wont drop SNR

pompey1898 — Wed, 17 Feb 2021 12:26:47 GMT

@samtheaspiewrote:
I’m trying to push for the the rural gigabit scheme for my village. Good luck with that, post back to let us know how you get on please