SFPs for VDSL/ADSL?

A. non Eyemouse

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Apr 23, 2020, 3:14:27 PM4/23/20

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Does anybody have any experience or know of availability of SFPs with
built-in VDSL modems? There was some talk on the Mikrotik forum and the
RevK blog going back a couple of years but I can't find any UK suppliers
showing them available.

I have an installation where I need to use a Mikrotik router and this
would be a tidier solution than having to bolt on a Vigor 130 or a
recycled Openreach modem.

--
Mouse.
Where Morse meets House.

Graham J

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Apr 23, 2020, 3:43:06 PM4/23/20

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Someting like this?

<https://www.cxr.com/en/produits/sfp-vdsl-238.html>

--
Graham J

A. non Eyemouse

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Apr 23, 2020, 3:57:24 PM4/23/20

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Yes, exactly those. Not made it across the Channel yet though.

Andy Burns

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Apr 23, 2020, 4:25:08 PM4/23/20

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A. non Eyemouse wrote:

> Graham J wrote:
>
>> A. non Eyemouse wrote:
>>
>>> Does anybody have any experience or know of availability of SFPs with
>>> built-in VDSL modems?
>>

>> <https://www.cxr.com/en/produits/sfp-vdsl-238.html>

Neat. GPON SFPs for FTTP caught my eye a few weeks ago.

> Yes, exactly those. Not made it across the Channel yet though.

Near enough, surely?

<https://www.reichelt.com/gb/en/mini-gbic-vdsl2-allnet-all4781v-p239043.html>

Brian Gregory

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Apr 23, 2020, 7:06:21 PM4/23/20

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I don't see how they can be a good choice.

No room for a properly rated isolation transformer and surge protection.

--
Brian Gregory (in England).

Brian Gregory

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Apr 23, 2020, 7:10:20 PM4/23/20

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On 24/04/2020 00:06, Brian Gregory wrote:
>> Near enough, surely?
>>
>> <https://www.reichelt.com/gb/en/mini-gbic-vdsl2-allnet-all4781v-p239043.html>
>>
>
> I don't see how they can be a good choice.
>
> No room for a properly rated isolation transformer and surge protection.

That one's data sheet says "Up to 20 Mbps upstream / 50 Mbps downstream"
which is, at least potentially, rather disappointing.

Theo

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Apr 24, 2020, 11:54:12 AM4/24/20

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Brian Gregory <void-invalid...@gmail.com> wrote:
> On 24/04/2020 00:06, Brian Gregory wrote:
> >> Near enough, surely?
> >>
> >> <https://www.reichelt.com/gb/en/mini-gbic-vdsl2-allnet-all4781v-p239043.html>

Oh, interesting...

> > I don't see how they can be a good choice.
> >
> > No room for a properly rated isolation transformer and surge protection.
>
> That one's data sheet says "Up to 20 Mbps upstream / 50 Mbps downstream"
> which is, at least potentially, rather disappointing.

It appears that might be because that's what you get over VDSL2 in Germany.
There is apparently some firmware to do 100/40, but its sync is unstable:
https://forum.turris.cz/t/user-experience-allnet-all4781-vdsl2-sfp-switch-modul-mini-gbic-vdsl2/7062

There's a variety of other ones around that might be more stable.

Theo

Theo

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Apr 24, 2020, 12:23:54 PM4/24/20

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Theo <theom...@chiark.greenend.org.uk> wrote:
> There's a variety of other ones around that might be more stable.

Looks like someone got one working on Sky:
https://forum.turris.cz/t/vdsl-sfp-bridge-modem/1296/35

and there's a Windows tool called DSLMonitor Lite for getting stats out of
it. They all seem to be the Metanoia MT-V5311 in disguise.

Theo

A. non Eyemouse

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Apr 24, 2020, 6:50:55 PM4/24/20

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On 24/04/2020 00:06, Brian Gregory wrote:

>

> No room for a properly rated isolation transformer and surge protection.
>

Good point. I'll take the cover off my Openreach modem and see what's in
there in terms of protection.

A. non Eyemouse

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Apr 24, 2020, 6:52:53 PM4/24/20

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So realistically it doesn't appear to be mature enough technology for UK
VDSl at present then. Looks like I'll have to park the idea and carry on
with the 2nd white box.