topic Re: Question about SNR, line attenuation and data rates. in Broadband & Landline

Question about SNR, line attenuation and data rates.

mrmichaelsankey — Tue, 11 Oct 2022 20:42:23 GMT

Ok, so after a month of hammering away to get connected, finally got Openreach to connect me up at the cabinet.

The engineer told me "you have a good signal, you could easily be in the 70/15 mbps range.....

Call EE - "we can't increase your speed, Openreach guidelines state the maximum you can get is 34/7 mbps"

I currently, after a week, have an download/upload of 30/8 mbps, downstream snr of 7.6-7.9dB, Line attenuation of 23.4dB, power of 12.1dbm.

Been having some power issues (RCD is playing up and tripping between 2 and 5 times a day at a very low level of 7-9 milliamps instead of 25-30 milliamps earth leakage) for the last 2 weeks, should be resolved this week. I know restarts can hamper progress at getting a speed increase, but thought it worth a mention.

Thoughts? Let it roll for a while and try for a speed increase? Wait for the eventual roll out of fibre?

Any advice is appreciated!

Re: Question about SNR, line attenuation and data rates.

XRaySpeX — Tue, 11 Oct 2022 21:33:55 GMT

Welcome to EE's Home Broadband Forum.

Losing power a few times a day for 2 weeks will play havoc with your speeds.

If you would like help with your BB speed or connection issues, please would you carry out the following steps for starters, which will enable us to diagnose the problem and advise you further. Do not restart your router to do these tests:

1. Post your full router stats:

For a BrightBox: login and go to Advanced Settings > System > DSL Status. Also post 'System Uptime' from top of System Log page.
For a SmartHub: login and go to Advanced Settings > Technical Log > Information. Obscure your names & any numbers in the BB Username & also the SSIDs.

Full router stats are key to any speed & connection issues.

2. What does BT Wholesale Broadband Availability Checker estimate for your phone number? Post just the whole table and the line above it, blanking out your phone number. If it doesn't recognise your phone number or you don't have one, use the Address Checker, not the Postcode Checker.

Re: Question about SNR, line attenuation and data rates.

Mustrum — Tue, 11 Oct 2022 21:37:07 GMT

@mrmichaelsankey your dodgy power will not be helping your broadband speeds that is for sure.

But to start with, what is your line capable of, and what are the current sync speeds. If you enter your phone number and post the results from the BTW DSL checker that at least will give a starting position. Hide your phone number and use the address checker if you don't have a phone number.

Re: Question about SNR, line attenuation and data rates.

mrmichaelsankey — Wed, 12 Oct 2022 10:58:39 GMT

Thanks for the responses.....

In reverse order:

wholesale checkerRouter stats

Please don't hate me for not using the brirghtbox, it just doesn't have the range and configurability of a DSL-AC88U.

I now, as of this morning, have a replacement RCD in our fuse box, this hopefully should give me some breathing room on the power going up and down.

I guess I just want instant results which I know I won't get in trying to get the best line speed possible.

Cheers,

Mike

Re: Question about SNR, line attenuation and data rates.

XRaySpeX — Wed, 12 Oct 2022 11:15:37 GMT

Not at all. That's an excellent modem-router.

The BT eng was talking thro' his hat when he said you'll get 70/15 Meg. The best you could expect is 47/8 Meg. As it is you are only slightly below the expected range with 30/7.8 Meg., almost certainly the result of your power supply tripping out frequently.

The DLM system has put you on a banded profile in response to these errors on your line, at the top of the up to 30 Meg band of these VDSL Banded Profiles, altho' you now have no significant errors. You need to give the DLM time to relent & remove any banding. If your sync speed at the test socket remains stuck at the same speed for 10 days you should ask EE to investigate the underlying fault, altho' hopefully the new RCD should fix it within that timescale. If a fault is found and fixed then the OR engineer may request a DLM reset. However should significant errors persist the DLM will reapply banding.