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Author Topic: Anyone on 20CN  (Read 534 times)

Weaver

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Anyone on 20CN
« on: June 20, 2018, 12:36:32 PM »

Any Kitizens using 20CN lines?
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burakkucat

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Re: Anyone on 20CN
« Reply #1 on: June 20, 2018, 05:17:05 PM »

I believe that sheddyian, at his new home in Wales, is currently connected via a G.992.1 service. I.e. 20CN.

In his most recent post there are two sentences which, taken together, says "20CN" to me --

Down/Up speeds are still 1920/480.

It is connecting in G.DMT mode, if I try to force it to anything else, it won't connect at all.
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Chrysalis

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Re: Anyone on 20CN
« Reply #2 on: June 20, 2018, 06:45:25 PM »

I remember those days for me horrible compared to now :(

choice of unreliable adsl1 which had massive noise bursts every office day, or NTL with congestion at "unreal" levels.
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Weaver

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Re: Anyone on 20CN
« Reply #3 on: June 20, 2018, 07:06:32 PM »

In November 2015 I was still on 20CN with:
  • horrible stupid DLM behaviour with huge unnecessary delays before IP profiles would go back up,
  • horrible stupid 0.25Mbps or 0.5Mbps rungs, so on average 125kbps or 250kbps simply wasted for absolutely no reason,
  • stuck on G.992.1, without the improved performance of G.992.3
I was stuck on 500k fixed for two years and on DSLMax 20CN for 9.5 years while the rest of the world moved on, ADSL2 came, then ADSL2+ then VDSL2 while here time stood still until the end of 2015. I got switched over to ADSL2 on christmas day 2015 or something like that.

So that is only two and a half years ago. Seems like an eternity.

Now speeds are vastly improved, up from 5.25-6.0 Mbps back in 2015 to 7.3-8.0 Mbps now, and no horrible DLM behaviour.
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ejs

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Re: Anyone on 20CN
« Reply #4 on: June 20, 2018, 07:51:37 PM »

I believe that sheddyian, at his new home in Wales, is currently connected via a G.992.1 service. I.e. 20CN.

One of the earlier posts in that thread showed WBC ADSL2+ is available. Plusnet tend to put long lines on ADSL1.
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Weaver

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Re: Anyone on 20CN
« Reply #5 on: June 20, 2018, 08:12:57 PM »

If OlusNet is doing that then I think they are insane. Long line users need all the help they can get and ADSL2 has a number of performance improvements such as single bit constellations ie one bit per tone not a minimum of two. There are a number of other things in the standard which I forget. ADSL2 offers G.INP, which no one implements per-se, but I do now enjoy the Broadcom proprietary equivalent PhyR. PhyR seems to have been a really big deal for me, possibly being part of the recent improvements that have given me a much more stable connection in terms of SNRM fluctuations and connection up-time, and it has allowed reduced interleave depth, for people who care about such things.

I simply cannot for the life of me imagine how anyone could justify choosing G.992.1 over G.992.3. There is a reason why they did all that work and rightly called those developments improvements.
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ejs

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Re: Anyone on 20CN
« Reply #6 on: June 20, 2018, 08:27:19 PM »

It's because the oldest type of ADSL2+ exchange equipment does it so badly that ADSL1 is probably going to be better than ADSL2+ on those lines, and the ISP is not going to know what type of exchange equipment it is. Yet people don't complain about the different types of exchange equipment like they complain about ECI FTTC cabinets.
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kitz

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Re: Anyone on 20CN
« Reply #7 on: June 21, 2018, 02:13:32 AM »

^ Yep.   

In addition there were also the Marconi MSANs which don't do more than 448kbps upstream very well.   Jelv knows all about that one.
Going back further there were the Junipers that had a problem with >2Mbps /maxdsl.  Can't recall what that was now it was so long ago.   
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Weaver

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Re: Anyone on 20CN
« Reply #8 on: June 21, 2018, 02:47:15 AM »

I didn't know that. So it is all about crappy implementation nothing to do with the standards at all - I forgot about that aspect. Thanks for explaining it to me.
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