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Standard User RobertoS
(elder) Thu 11-May-17 12:58:40
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Re: Best ADSL modem for long line?


[re: radiomarko] [link to this post]
 
Oh dear frown. The old one we had to ask lots of people next to railway lines, and in particular if they were close to level crossings.

LED street lights will inevitably spread.

My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 63086/13719Kbps @ 600m. BQMs - IPv4 & IPv6

Edited by RobertoS (Thu 11-May-17 12:58:55)

Standard User 4M2
(knowledge is power) Thu 11-May-17 14:26:08
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Re: Best ADSL modem for long line?


[re: dewi] [link to this post]
 
In reply to a post by dewi:
The line didn't drop last night. I'll continue to monitor.


Monitoring with RouterStats-Lite I found useful - I was able to easily show the visiting OR SFI engineer the pattern of noise bursts causing a sudden downstream SNRM fall from 6dB to 0dB and the subsequent resync.

Best of luck.
Standard User MHC
(sensei) Thu 11-May-17 18:48:50
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Re: Best ADSL modem for long line?


[re: dewi] [link to this post]
 
Just watch tonight and see when teh lights go on! LED lights are known to give very high levels of RFI.

Keep checking the status page for sync speed and take screen shots ... Include the little bit loading graph at the bottom too.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

M H C


taurus excreta cerebrum vincit


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Standard User dewi
(regular) Wed 17-May-17 13:06:44
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Re: Best ADSL modem for long line?


[re: dewi] [link to this post]
 
The 2700HGV hasn't lost connection since Zen forced interleaving on last Wednesday, meaning that it remains connected at 2777 kbps. I'm very happy with that, as it's towards the upper end of the line speeds I was seeing with the Billion 7800N.

The noise margin is about 14.5 to 15.5 dB during the day, dropping to 5.5 dB every night.
Standard User CecilWard
(newbie) Sun 30-Jul-17 01:56:38
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Re: Best ADSL modem for long line?


[re: dewi] [link to this post]
 
My lines are rather longer than yours 4.55 mi and 67dB downstream attenuation. I get 2600-2900k downstream and around 400-500k upstream. Modems that have been very successful for me are dlink dsl 320b-z1 (needs config tweaking for sanity as defaults are nutty when set up as a straight pppoe modem, and must not be used as a router as it is horrendous and unsafe in that case). The dlink modems are what I am using now. Pert of their high speed comes from the favtvthatbtheybseem ti run at a really really low downstream SNR margin compared to their target. An initial 6dB or 3dB downstream target soon drops down to 1dB or less at which point they start to become a little too aggressive and are pushing their luck. They are an ideal choice for me tho as I want extreme speed at all costs, and since I have three bonded dsl lines with very fast load-spreading and failover, then I don't care about a modem resyncing once a week or so as I never even notice it since the others just almost instantly take over as the ISP's routers (and my own) react having detected the failure within seconds.

I have recently very briefly tried a ZyXel VMG13120-B10A (see http://forum.kitz.co.uk/index.php/topic,19011.msg338... ) which was extremely fast. Haven't got it properly set up yet. This device, used as a modem-only, not a router synced at 3100k instead of a typical 2700k (best ever 2900k) with the otherwise excellent DLinks. According to that article linked to and various other sageful opinions, the variant B10A has better hardware for long DSL lines than the B10D, but unfortunately I am told that the more desireable 10A model is becoming harder to get hold of. (Ebay?) I should have got two more units quick myself.
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