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Author Topic: ADSL Loop Extender / ADSL DSLAM in All in One Cab?  (Read 848 times)

Weaver

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  • Retd sw dev; A&A; 4 × 7km ADSL2; IPv6; Firebrick
Re: ADSL Loop Extender / ADSL DSLAM in All in One Cab?
« Reply #15 on: December 05, 2020, 01:25:13 PM »

My 3G failover system is orovided by a USB ‘dongle’ 3G NIC which looks like a modem to the router and the router switches over diverting traffic to 3G when all copper lines fail at the same time. My ISP does a PPP LCP ‘ping’ (not an ICMP usual ping, but they can do the latter too) of each of my lines every few seconds and my router similarly PPP LCP pings some [? which  ???] router at the ISP end every few seconds similarly to test whether or not each line is up, so if one link goes down then it redirects upstream traffic. If my router detects all lines really going down at the same time, it then switches over to 3G instead.

So both the ISP and my own router know from one second to the next whether a link is really up or down by testing all the way to the far end; ie a modem might report that a line is ‘up’ but there is an outage further away so the link effectively is still no good, but since we use end-to-end test continuously we really know whether the link is truly working or not (and we also know the latency too).

I have a program I wrote running in my iPad that talks to all my four modems (which contain custom firmware written by my friend here ‘johnson’  ;D ) and the program queries each modem for sync rates down and up. It converts the upstream rate received from sync rate to IP PDU rate (using the aforementioned multiplication) and generates an appropriate snippet of router XML config containing correct speed limits upstream for each modem (hence the 0.95 ‘modem loading factor’ which is used as well as the ‘protocol efficiency factor’ which for you and for me would be 0.884434 assuming your ADSL2 like me has a 32 byte protocol overhead for the combined total of all ADSL protocols below IP). This snippet of XML is inserted into an XML config file template and then the combined result is uploaded into my router. This means that the upstream speeds are set correctly for each line whenever I run the program, but this is not automatic, I have not yet got this to run on a monitoring server and change the speeds when needed. In any event that might not be such a good thing, since changing the ‘upstream egress rates’ on a link results in a tiny downtime, hardly noticeable, but it does happen if the old and new speeds differ. So I don’t routinely do it, not unless a link’s speed has gone down significantly.


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Weaver

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  • Posts: 9523
  • Retd sw dev; A&A; 4 × 7km ADSL2; IPv6; Firebrick
Re: ADSL Loop Extender / ADSL DSLAM in All in One Cab?
« Reply #16 on: December 05, 2020, 01:31:26 PM »

My modems are all ZyXEL VMG 1312-B10As containing johnson’s excellent firmware; they are in straight modem-only mode. `here are thr current speeds:

Live sync rates:
  #1: down 3122 kbps, up 528 kbps
  #2: down 3066 kbps, up 576 kbps
  #3: down 3096 kbps, up 396 kbps
  #4: down 3139 kbps, up 570 kbps


Firebrick current upstream rate limiters' IP PDU tx rates (egress speeds), in-force right now ::
  #1: 443632 bps
  #2: 483962 bps
  #3: 332724 bps
  #4: 478920 bps
Total combined rate: 1.739238 Mbps (note: that latter is a theoretical combined total; what it should be, not what it is.)

Fractional speed contributions:
  #1: 25.507%
  #2: 27.826%
  #3: 19.130%
  #4: 27.536%
--
Obtained from live-querying the Firebrick.
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cancunia

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Re: ADSL Loop Extender / ADSL DSLAM in All in One Cab?
« Reply #17 on: December 05, 2020, 02:15:19 PM »

I'm now at the point where it's become clear that BT's offerings for the USO are FTTP & 4G via EE.
In 2018 LR-VDSL which was for a while seen as the answer to cabinet based improvements to long copper lines was withdrawn after the PoC leaving the 2 options above.
https://www.ispreview.co.uk/index.php/2018/04/openreach-start-removing-lr-vdsl-broadband-from-uk-trial-areas.html
It's not really worth getting into why LR-VDSL did not fly, it's simply not available any more, at least not for now. Maybe an alternative will appear at some point.

I'm going to see what happens when my MP's office reply to my complaint and will report back if anything useful happens. 
In the mean time, many thanks to those that have replied to my post.
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Weaver

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  • Posts: 9523
  • Retd sw dev; A&A; 4 × 7km ADSL2; IPv6; Firebrick
Re: ADSL Loop Extender / ADSL DSLAM in All in One Cab?
« Reply #18 on: December 05, 2020, 03:14:35 PM »

A speed test today using my own ISP’s speed tester at https://speedtest2.aa.net.uk give 10.6 Mbps downstream and a miserable 1.0 Mbps upstream; testmy.net at https://testmy.net/upload gives a rather better 1.3Mbps upstream and 1.4Mbps some days. I can’t guarantee that there isn’t some other source of traffic using my own link here as my wife may be using the internet right now.

My router is a Firebrick FB2900 with the ‘fully loaded’ software load, which is required to support IP bonding. It’s a stunning firewall/router aside from the thing about bonding; it’s extremely powerful, superbly built and it comes with limitless lifetime support and help with configuring it as you need it. You can either get it all configured for you ready to go or you can configure it yourself and you or your reseller (typically aa.net.uk). See:
    https://www.aa.net.uk/firebrick/
    https://support.aa.net.uk/Category:FireBrick

All the manuals are available on the web too, eg: https://download.firebrick.co.uk/manuals-plain.php?PRODUCT=2900 so you can read all about one.

I’ve only just remembered that Firbricks can now be rented very cheaply which is great if our don’t have nearly £700 burning a hole in your pocket. I regularly get lightning strikes being so high and exposed where I am (some half a mile north of IV499BN) with such long copper lines and some years back I asked about repair costs for my Firebrick FB2700 router and AA (from whom I had bought it) just gave me a new device foc!  ;D I was definitely delighted.

Rental details:
    https://www.aa.net.uk/firebrick/rental/

I have being moaning in and on for years and years about how good this device is in terms of its build quilts, power and outstanding ease of use, so before I get rightly banned, I shall suggest trawling through older threads where I have written a lot about the FB2500 FB2700 and now FB2900 firewall-routers.
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