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Author Topic: A Query Regarding VDSL2 Profile 30a  (Read 4066 times)

mofa2020

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A Query Regarding VDSL2 Profile 30a
« on: February 08, 2020, 07:13:41 PM »

I have a question about the profile 30a, I read that it can theoretically deliver upto 200/100mbps but for some reason many routers that support profile 30a stats that it support only upto 100mbps vdsl2 speed which is confusing me, for ex. vigor 2762 so how come this to be true? and what is the benefit of supporting 30a while limiting to 100mbps? other than having 100/100mbps speed.
« Last Edit: February 08, 2020, 08:18:05 PM by mofa2020 »
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burakkucat

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #1 on: February 09, 2020, 12:13:56 AM »

I doubt if any members (in the U.K.) will be able to give you a explanation.

Perhaps you could ask Draytek directly about the Vigor 2762?  Looking at the specifications of the version that is available for the U.K. and Irish markets it just mentions "VDSL2 Profile: 8a, 8b, 8c, 8d, 12a, 12b, 17a, 30a". I do not see any obvious mention of a 100 Mbps limit for Profile 30a.

There is one difference between Profile 30a and all of the other VDSL2 profiles -- the sub-carriers (tones) are spaced every 8.625 kHz rather then every 4.3125 kHz, as with Profiles 8a to 17a. 
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mofa2020

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #2 on: February 09, 2020, 11:58:14 AM »

I do not see any obvious mention of a 100 Mbps limit for Profile 30a.

This is strange because it is mentioned on draytek.com "global website I believe" and not the UK website, I know that for UK there will be some differences in specifications but thought the base line will be the same for the modem. :hmm:
« Last Edit: February 09, 2020, 12:01:06 PM by mofa2020 »
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Silverback

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #3 on: February 09, 2020, 12:16:35 PM »

The .com site shows the 2762 with a max NAT throughput on VDSL of 100Mbps.

https://www.draytek.com/products/vigor2762/#overview

Could that be the bottleneck you speak of?
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mofa2020

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #4 on: February 09, 2020, 12:42:33 PM »

The .com site shows the 2762 with a max NAT throughput on VDSL of 100Mbps.

https://www.draytek.com/products/vigor2762/#overview

Could that be the bottleneck you speak of?

Yes that is the point I am asking about.
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Alex Atkin UK

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #5 on: February 09, 2020, 06:49:21 PM »

Yes that is the point I am asking about.

Then its basically just the CPU that is under-powered, nothing to do with the modem.
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Silverback

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #6 on: February 09, 2020, 07:05:33 PM »

I've got a UK 2862.  On the .com site it's advertised with the same 100Mbits throughput limit but I see no mention of this limit an the co.uk site.  The co.uk site just lists a firewall throughput of 400Mbits.  I've raised the question with Draytek UK support with reference to 2862 (as that's what I have registered with them).  They will probably take a couple of days to respond...
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mofa2020

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #7 on: February 09, 2020, 07:28:21 PM »

Then its basically just the CPU that is under-powered, nothing to do with the modem.

I see, so it would probably hold 100/100mbps.

I've got a UK 2862.  On the .com site it's advertised with the same 100Mbits throughput limit but I see no mention of this limit an the co.uk site.  The co.uk site just lists a firewall throughput of 400Mbits.  I've raised the question with Draytek UK support with reference to 2862 (as that's what I have registered with them).  They will probably take a couple of days to respond...

Thank you Silverback, looking forward to hearing their replay.
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Alex Atkin UK

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #8 on: February 09, 2020, 07:29:35 PM »

I've got a UK 2862.  On the .com site it's advertised with the same 100Mbits throughput limit but I see no mention of this limit an the co.uk site.  The co.uk site just lists a firewall throughput of 400Mbits.  I've raised the question with Draytek UK support with reference to 2862 (as that's what I have registered with them).  They will probably take a couple of days to respond...

That's certainly curious as you'd except NAT throughput and Firewall throughput to basically mean the same thing.

Now throughput with PPP vs plain Ethernet, that will differ.
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PhilipD

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #9 on: February 10, 2020, 09:35:50 AM »

Hi

Long gave up with Draytek kit, seems very expensive for what you actually get, but anyway...

It is quite likely the VDSL modem chipset is connected internally using a 100Meg Ethernet connection, so that gives it that hard 100 limit.  The Firewall rating (400Meg) will be based on using the 1Gig WAN connection.  Even then 400 Meg isn't particularly brilliant and the whole thing is running at 18 watts power consumption so it looks like an old design (like their UI) using an old SoC or discrete processor.  Like I say, a lot of money for something that isn't very well specified.

Regards

Phil



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mofa2020

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #10 on: February 10, 2020, 09:54:43 AM »

Hi

Long gave up with Draytek kit, seems very expensive for what you actually get, but anyway...

It is quite likely the VDSL modem chipset is connected internally using a 100Meg Ethernet connection, so that gives it that hard 100 limit.  The Firewall rating (400Meg) will be based on using the 1Gig WAN connection.  Even then 400 Meg isn't particularly brilliant and the whole thing is running at 18 watts power consumption so it looks like an old design (like their UI) using an old SoC or discrete processor.  Like I say, a lot of money for something that isn't very well specified.

That would explain it, were thinking to get one actually but after what you said  :no: though the amount of information about line stats is awesome but still not worth it for me.
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PhilipD

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #11 on: February 10, 2020, 10:18:04 AM »

Hi

Do you have a profile 30a VDSL connection then?

Regards

Phil

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mofa2020

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #12 on: February 10, 2020, 10:23:43 AM »

No I do not at the time, but I were thinking to replace my current ZTE (ISP one, I am not from UK) router and buy something that would be future proof and reliable at the same time.
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Silverback

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #13 on: February 10, 2020, 10:38:01 AM »

Hi

Long gave up with Draytek kit, seems very expensive for what you actually get, but anyway...

It is quite likely the VDSL modem chipset is connected internally using a 100Meg Ethernet connection, so that gives it that hard 100 limit.  The Firewall rating (400Meg) will be based on using the 1Gig WAN connection.  Even then 400 Meg isn't particularly brilliant and the whole thing is running at 18 watts power consumption so it looks like an old design (like their UI) using an old SoC or discrete processor.  Like I say, a lot of money for something that isn't very well specified.

Regards

Phil

For me, the jury is still out.  With 17a VDSL2 the 100Mbit throughput limit is a non-issue really.  It's got an Gigabit Ethernet LAN port also.  I'm currently running it with a HG612 and I think that is maxed out at 80Mbps... would only become a problem if OpenReach go for 30a profile but form what I understand that is unlikely to happen.

The latest Draytek (2865, 2765, 165) all seem to tout 300Mbits DSL throughput.

The Draytekk don't seem to run the latest hardware, I guess that's a strategy.  It has a reasonable feature set. Having said that I don't think I would buy a dual modem / router again, but DSL modem choice is limited...
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j0hn

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Re: A Query Regarding VDSL2 Profile 30a
« Reply #14 on: February 10, 2020, 10:55:53 AM »

OpenReach can't/won't roll out profile 30a, there's no worries there.
It runs in the G.Fast spectrum and I don't think it's backward compatible with 17a.

Profile 35b was much more likely before G.Fast was chosen. Now neither are likely.
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