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Author Topic: Download speed is lower than I would perhaps expect?  (Read 2181 times)

chris3234

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Re: Download speed is lower than I would perhaps expect?
« Reply #15 on: January 13, 2022, 11:38:23 AM »

Yes sync is already maxed out. I just find it curious that I seem to be capped just under 70Mbps
you will not ever get 100% of sync speed as download speeds it dosnt work like that at lest some oof it is used by the overheads in mx experence its around 5-10% so your only a few mb sort of full speed possible a bit more if you have ginp or interleaving enabled
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tiffy

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Re: Download speed is lower than I would perhaps expect?
« Reply #16 on: January 13, 2022, 12:58:57 PM »

Have you ever established what your line DS BRAS profile is?

The normal way of checking this is via BTw performance checker:
https://speedtest.btwholesale.com/
Proceed to additional diagnostics and enter phone number after the speed test is performed.
(Note, speed test results are notoriously inaccurate on this checker but BRAS profile should be authentic)

Or via mouselike.org BRAS checker:
https://windows.mouselike.org/be/index.asp?DoAction=BrasChecker

However, from memory, these suggestions may not work on Talk-Talk provided VDSL service lines, perhaps other TT service users can advise further.
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burakkucat

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Re: Download speed is lower than I would perhaps expect?
« Reply #17 on: January 13, 2022, 03:41:05 PM »

However, from memory, these suggestions may not work on Talk-Talk provided VDSL service lines, perhaps other TT service users can advise further.

Your memory is correct. Neither of those utilities will work for a circuit defined by a TT telephone number.
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meritez

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Re: Download speed is lower than I would perhaps expect?
« Reply #18 on: January 13, 2022, 04:26:28 PM »

TalkTalk's on network speed tester is https://www.supportal-test.co.uk/
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Alex Atkin UK

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Re: Download speed is lower than I would perhaps expect?
« Reply #19 on: January 13, 2022, 04:37:07 PM »

For reference, when synced at the full 79.995 Mb/s / 20.000 Mb/s you only get throughput of around 74Mb / 17Mb max.

I will agree you should be getting more than 60Mb though, which as someone else mentioned could very well be your line profile is wrong and up to Talk Talk to sort out.

I can achieve the full 80/20, though Talktalk seems to cap me at 76/20.

I'm moving to a Gamma BTW SoGEA on the 11th as I'm sure Talktalk are stopping at a 4db profile when my line is capable of 3db.

That's interesting as I've never seen above 74Mbit down.
« Last Edit: January 13, 2022, 04:41:31 PM by Alex Atkin UK »
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j0hn

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Re: Download speed is lower than I would perhaps expect?
« Reply #20 on: January 13, 2022, 05:23:33 PM »

That's interesting as I've never seen above 74Mbit down.

I'm sure he means his sync doesn't go above 76Mb, because the DLM is stopping at 4dB instead of trying 3dB.

That's certainly not a Talktalk limitation (or a limitation any ISP can have) but possibly just his lines DLM history.

It's certainly possible to get above 74Mb/s throughput on FTTC though.
With fastpath on a full 80Mb sync the BT IP profile is usually 96.79% of the sync speed. That gives an IP profile of 77.43Mb.
You can get 77Mb/s throughput with that.
With Retransmission Low the IP profile is 96.69% of sync.

With either of those you should be able to manage throughput of 76mb/s.

Retransmission High gives IP profile between 91-92%.

There's been quite a few threads over the past couple years where users have been getting IP profiles around 88% but nobody ever knew the reason why.
« Last Edit: January 14, 2022, 01:45:26 PM by j0hn »
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tiffy

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Re: Download speed is lower than I would perhaps expect?
« Reply #21 on: January 13, 2022, 05:44:51 PM »

TalkTalk's on network speed tester is https://www.supportal-test.co.uk/

So, is there any way of finding what the DLM BRAS profiles are on TT provided VDSL-2 service which as far as I know use the OR/BTw FTTC infrastructure as per any other ISP, unlike their POTS/ADSL service where TT have a substantial LLU presence in most major exchanges?
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Alex Atkin UK

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Re: Download speed is lower than I would perhaps expect?
« Reply #22 on: January 13, 2022, 06:09:31 PM »

With either of those you should be able to manage throughput of 76mb/s.

Retransmission Low gives IP profile between 91-92%.

There's been quite a few threads over the past couple years where users have been getting IP profiles around 88% but nobody ever knew the reason why.

It must be the latter as I turned off QoS recently on pfSense and its still capping out at 74MBit.  The same router pushes 500Mbit over 5G though obviously no PPP overheads there (at least not on pfSense, not sure how data works on mobile these days).

I do seem to recall pfSense performed worse than a direct connection to the modem on Windows though, haven't checked that in a while.
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Reformed

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Re: Download speed is lower than I would perhaps expect?
« Reply #23 on: January 13, 2022, 09:23:35 PM »

Reminder that TalkTalk Retail doesn't use PPP, Ethernet all the way.

meritez

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Re: Download speed is lower than I would perhaps expect?
« Reply #24 on: January 14, 2022, 12:24:19 AM »

Reminder that TalkTalk Retail doesn't use PPP, Ethernet all the way.

You mean IPoE not PPPoE for FTTC?

Their system states this:
Code: [Select]
Authentication Types
Full Network - Full Network Authentication does not require a Username or Password in the Customer's router. Authentication is done purely by using the Network ID from the MSAN/DSLAM.

Network - Network Authentication requires a Username in the Customer's router, but does not require a Password. Instead the Network ID from the MSAN/DSLAM is used to authenticate the Customer.

Password - Password Authentication requires a Username and Password in the Customer's router.

NonManaged - Authentication details are held off the TalkTalk network. TalkTalk authenticate at a realm level (e.g. @3rdpartyISP.net) and the authentication is then passed onto the 3rd party.

I would guess the Full Network one is the IPoE one, the Password one must be a PPPoE connection, and NonManaged is TalkTalk Business Wholesale partners like Zen, Shell, Post Office etc?

What would Network be, PPPoE where the username is correct but the password does not matter?
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Weaver

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Re: Download speed is lower than I would perhaps expect?
« Reply #25 on: January 14, 2022, 07:22:04 AM »

J0hn wrote:
> Retransmission Low gives IP profile between 91-92%.

@J0hn - shouldn’t that be "High", not "Low" ?
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j0hn

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Re: Download speed is lower than I would perhaps expect?
« Reply #26 on: January 14, 2022, 01:45:45 PM »

J0hn wrote:
> Retransmission Low gives IP profile between 91-92%.

@J0hn - shouldn’t that be "High", not "Low" ?
Yes. Edited my post.
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j0hn

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Re: Download speed is lower than I would perhaps expect?
« Reply #27 on: January 14, 2022, 01:53:19 PM »

You mean IPoE not PPPoE for FTTC?

IPoE/DHCP for FTTC (both VDSL2 & G.Fast) and FTTP. Only residential customers though.
IPoE being IP over Ethernet.

Their system states this:
Code: [Select]
Authentication Types
Full Network - Full Network Authentication does not require a Username or Password in the Customer's router. Authentication is done purely by using the Network ID from the MSAN/DSLAM.

Network - Network Authentication requires a Username in the Customer's router, but does not require a Password. Instead the Network ID from the MSAN/DSLAM is used to authenticate the Customer.

Password - Password Authentication requires a Username and Password in the Customer's router.

NonManaged - Authentication details are held off the TalkTalk network. TalkTalk authenticate at a realm level (e.g. @3rdpartyISP.net) and the authentication is then passed onto the 3rd party.

I would guess the Full Network one is the IPoE one, the Password one must be a PPPoE connection, and NonManaged is TalkTalk Business Wholesale partners like Zen, Shell, Post Office etc?

What would Network be, PPPoE where the username is correct but the password does not matter?

Pretty much yes.
« Last Edit: January 14, 2022, 02:00:21 PM by j0hn »
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burakkucat

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Re: Download speed is lower than I would perhaps expect?
« Reply #28 on: January 14, 2022, 03:20:18 PM »

Reminder that TalkTalk Retail doesn't use PPP, Ethernet all the way.

You mean IPoE not PPPoE for FTTC?

That is my understanding of what Reformed has typed and, as a user of a TalkTalk consumer/domestic/retail (call it what you like) service delivered over the Openreach FTTC infrastructure, that is the case.
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burakkucat

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Re: Download speed is lower than I would perhaps expect?
« Reply #29 on: January 14, 2022, 06:06:33 PM »

Irrelevant, off-topic, posts have been removed.
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