Broadband Related > FTTC and FTTP Issues

Transition from Zen to Plusnet

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Vanburen:
I recently transitioned my home VDSL connection from Zen to Plusnet.

I was happy with the performance of my line, and thought it would largely stay the same (I use Plusnet at work and have been happy with them as well).

However after the switch I have had some very erratic performance (please see broadband quality links below), this increase increase in jitter and latency was also accompanied with the loss of approx 10mbs of bandwidth. The router and modem used is the same for both Zen and Plusnet.

I spoke to Plusnet support and they indicated that there was a 10 day training period, and that I should wait for the line to stabilise.

I was just wondering if its normal to have this sort of instability when changing ISP's, when the line has been stable on the previous ISP?

And is it something to be concerned about or will it hopefully resolve itself?

07/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/5a46e1b4e5d33ee19306befb17d7d7ec4d9dfd65-07-05-201908/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/65d92340dbc5ed90a5d9b0510e6ac00698d6a590-08-05-201909/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/8f0c08241562ec89ac41b17fafb8945f35b99763-09-05-201910/05/19 (Switchover)https://www.thinkbroadband.com/broadband/monitoring/quality/share/495da71f8510941b4114f2b0f1bdeee24256888a-10-05-201911/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/2cc67211a0a04ed9f0b5a9e15a51bad222203531-11-05-201912/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/bbf15bb724c1f5ee3a66df7a7b0a6af3e72dae0f-12-05-201913/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/78d7c383c5b0a91d3375a760eba8b946d5d0c4a7-13-05-201914/05/19https://www.thinkbroadband.com/broadband/monitoring/quality/share/b22be4de00e689af87df5a390b93bdc84fd1b18d-14-05-2019

displaced:
Whilst you were with Zen, the DLM (Dynamic Line Management) settings for your line would have had time to enable/disable VDSL features to give you the fastest, most stable service your line could physically support.

When you change supplier, these settings are reset, so DLM needs to re-learn about your line.

At the moment, your line will be running without any bells and whistles enabled to combat interference or suboptimal line conditions. 

In particular, a feature called G.INP, designed to limit the impact of crosstalkers (other VDSL users' signals), will currently be switched off.

Over the next week or so, DLM will start enabling features (G.INP, Interleaving) to increase your line's stability.  It may also start lowering the SNRM (signal-to-noise ratio margin) if your line reaches a level of stability that'll support faster speeds.

As you're using the same modem as before, there's no reason why DLM won't eventually bring you back to the rates you were seeing before. 

Vanburen:
Thanks for the confirmation that the retraining is happening.

It's a shame the settings cannot be transferred between ISPs, forcing the line to be retrained every time you switch ISP is a disincentive to switch ISPs.

dambuilder:
I recently went the other way and gained 7 meg on download 2 meg on upload and ping went from circa 20 to 12 so well happy.

Vanburen:

--- Quote from: dambuilder on May 15, 2019, 09:30:42 AM ---I recently went the other way and gained 7 meg on download 2 meg on upload and ping went from circa 20 to 12 so well happy.

--- End quote ---

Out of interest, was that an immediate improvement? Or did you have to wait for the DLM re-training to finish? and if so how long did that take?

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