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Author Topic: Improve long line speeds with MK3 vDSL faceplate?  (Read 7876 times)

Weaver

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Re: Improve long line speeds with MK3 vDSL faceplate?
« Reply #15 on: March 25, 2016, 06:32:31 PM »

> I'll report back if I see any improvements.

I'd be very interested in hearing about your experiences with it.
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sheddyian

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Re: Improve long line speeds with MK3 vDSL faceplate?
« Reply #16 on: April 06, 2016, 07:52:10 PM »

I fitted the new VDSL MK3 plate last week, and got some basic stats from the router.  I also changed a few settings along the way, and did some tests.  Summary : it made a slight difference, but not much.  And the TalkTalk DSL3680 (firmware v1.13t) possibly has a reporting bug.

Code: [Select]
                             Sync      Attn.     S/N
Setting          Reported  UP  DOWN  UP  DOWN  UP  DOWN
==============   ========  === ====  ==  ====  ==  ===
Plug in filter   G.DMT     896 6560  25  38    7   6
VDSL MK3         G.DMT     896 6528  25  38    7   6.5
Force ADSL2      G.DMT     960 7424  23  37.5  7   6
Force ADSL2+     G.DMT     928 7360  23  38    8   6
auto             G.DMT     928 6656  25  37.5  7   6
ADSL2            G.DMT     960 7392  23  37.5  7   6
reboot unchanged G.DMT     928 7328  23  37.5  7   6.5

worst to best results       64  832   2   0.5  1   0.5

1st test was with existing plug in filter into standard NTE5A.  I then removed the filter, removed the NTE5A and remade the connections inside (seemed a touch loose) and fitted the VDSL MK3.  I also replaced the router cable with a slightly better twisted pair one (original was VERY thin indeed).  I squirted all contacts with contact cleaner. 

Comparing the 1st and 2nd tests (before and after VDSL) you can see that this didn't really make any difference.  Perhaps because I'd not waited long enough for the contact cleaner to dry, as subsequent tests showed a small improvement with the same router settings.

I then changed the ADSL mode from auto to ADSL2, as suggested by burakkucat.   After a reboot, the router still reported it was using G.DMT mode - I double checked, I had set it to use ADSL2.  And note the curious thing - the attenuation UP consistently drops from 25 to 23 when I've set the router into ADSL2 or 2+ mode, even though it's reporting the connection as G.DMT.  When I set it back to auto, the attenuation jumps back to 25 again.  So I'm unclear what mode it was actually connecting in!  Router reporting bug, or actually choosing to use g.dmt regardless (but then why did the attenuation change consistently?)

So, slightly worth doing, and it looks tidier, but didn't gain much overall.

Thoughts?

Ian
« Last Edit: April 06, 2016, 09:34:28 PM by sheddyian »
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ejs

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Re: Improve long line speeds with MK3 vDSL faceplate?
« Reply #17 on: April 06, 2016, 08:10:24 PM »

I suspect it's always ending up using G.DMT (ADSL1). ADSL1 line rates are always exact multiples of 32, ADSL2/2+ rates don't have to be. I'm not sure why attempting to change the mode appears to have had some effect without actually changing the mode that ends up being used.
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burakkucat

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Re: Improve long line speeds with MK3 vDSL faceplate?
« Reply #18 on: April 06, 2016, 09:03:54 PM »

Perhaps try with a modem that is known to comply with its mode setting?

A Huawei HG610, HG612 or HG622, for example.

(In your conclusion line of the table, I see a typo for the US SNRM. You show zero but looking at the data above, it should be one.)
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sheddyian

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Re: Improve long line speeds with MK3 vDSL faceplate?
« Reply #19 on: April 06, 2016, 09:36:22 PM »

Perhaps try with a modem that is known to comply with its mode setting?

A Huawei HG610, HG612 or HG622, for example.

(In your conclusion line of the table, I see a typo for the US SNRM. You show zero but looking at the data above, it should be one.)

I've corrected the typo, thanks.

I nearly took along my unlocked HG612, but felt it was going to be a bit inconvenient, as I'm using it myself!  I may yet do so though.  If I can find a cheap 2nd hand one, I'd leave it there with a Raspberry Pi and monitor the line for a while..  ::)

Ian

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