This topic

Asus router - data rate is 73% of max rate

MP99 — Sun, 04 Jul 2021 18:39:10 GMT

I am on the "Fibre with BT Halo 2" package.

I have been using Home Hub 6 for some time now, and had pretty reliable service - 52 down / 15 up, with nice solid graphs. Downstream sync speed was around 60mbps.

https://www.thinkbroadband.com/speedtest/1624976134128012755

This weekend I am trying out an Asus DSL-AC68U router, which is giving me 46 down / 16 up:

https://www.thinkbroadband.com/speedtest/1625420306689075055

However, I see in the router's diagnostics that my downstream "data rate" doesn't come close to the "max rate" figure, which I assume is my sync speed? Data rate is 73% of max rate.

	Down	Up
Data Rate	52567 kbps	19272 kbps
Max Rate	72112 kbps	19273 kbps

I have previously had a situation where my download speeds were throttled (this might have been back in the ADSL2 days) and I wasnt't receiving the full speed that my line was capable of. I ssuspect I'm in the same situation again now.

I had a web-chat with support, who decided all was OK with my profile, so are now sending out a tech to investigate.

Is it possible that someone can check my line for an issue, which might avoid a visit? BTW, I had to reboot the new router a few times to get it working - it reported sync & an internet connection but browser could not display pages. It worked OK after I set MTU to 1400 & rebooted my PC - I suspect it was the reboot that picked up a new DHCP config. MTU is now reset to 1492.

If it helps, I ran the checker at https://www.broadbandchecker.btwholesale.com/#/ADSL - see below. An engineer rewired when I upgraded to VDSL - it says Master Socket 5C.

Alternatively - am I just mis-understanding what that "max rate" figure means?

Thanks for any help,

Martin

Featured Products	Down high	Down low	Up high	Up low	Handback threshold
VDSL Range A (Clean)	73.7	54	20	14	47
VDSL Range B (Impacted)	71.4	48.3	20	12.3	38.4

Observed Speeds	VDSL
Max Observed Downstream Speed	51.66
Max Observed Upstream Speed	19.16
Observed Date	2021-07-04

Premise Environment	Status
Bridge Tap	N
VRI	N
NTE Face Plate	N
Last Test Date	22-06-2021

Re: Asus router - data rate is 73% of max rate

imjolly — Sun, 04 Jul 2021 19:00:22 GMT

i suspect that all the resets which you did when changing routers and then again trying to get connection working have resulted in DLM taking action to reduce speed and increase noise margin. Unfortunately you have not posted the current noise margin but will be higher then normal 6db

If you maintain stable connection your speed should recover nearer attainable

Re: Asus router - data rate is 73% of max rate

MP99 — Sun, 04 Jul 2021 20:08:33 GMT

Downstream SNR is 3.1dB.

As I said, I suspect my sync (~72mbps) is much higher than with the home hub 6 (~60mbps), but there is something setting a limit to my data rates.

My speedtest (46.3) seems to be about 64% of my sync (72.5).

As you say, if DLM was interfering I would expect the SNR to be increased and the sync rate to be reduced (and for this to then gradually improve over a period of days). I understand (but very happy to be corrected) that DLM won't leave the SNR at 3dB but then limit the data rate.

Conversely, if I was on a 40mbps package, I'd expect my sync to max out and then see something like 37mbps speedtest over a 70mbps connection??

Again - happy to be corrected if I've mis-understood.

Thanks for all your help, Martin

Re: Asus router - data rate is 73% of max rate

imjolly — Sun, 04 Jul 2021 20:22:17 GMT

From what you have posted you do not have a sync speed of 72mb but currently your sync/connection speed is about 51/52mb from your router stats and the dslchecker results obviously as you connection speed is about 52mb then your download speed will be less probably 42/46mb by ethernet your connection time is only 2hrs is that manual reset or router dropping connection?

Any line noise. Dial 17070 option 2 should be silent and best with corded phone.

Re: Asus router - data rate is 73% of max rate

TimCurtis — Mon, 05 Jul 2021 08:01:49 GMT

@MP99

How do your settings compare to mine:-

Re: Asus router - data rate is 73% of max rate

bkehoe — Mon, 05 Jul 2021 08:47:39 GMT

Using this Asus router is highly likely to be part of the problem for sure. This model uses a Mediatek chipset which is known to have significant compatibility and performance issues, and I believe Openreach disable g.inp when detecting them being used which will reduce performance. Your stats show Interleaving is now in use which will generate an artificially high 'attainable' rate.
If you search some of the enthusiast forums such as kitz.co.uk you can find more info on why using any other router (including the BT Hub) is probably better. 🙂

Re: Asus router - data rate is 73% of max rate

TimCurtis — Mon, 05 Jul 2021 10:44:27 GMT

@bkehoe

Can't really agree with you there.

If I switch to a SmartHub my download speed increases slightly but my upload decreases noticeably . These are my stats currently:-

I've only recently been switched to Interleave but my ping is 7ms generally but I don't game so not bothered anyway.

You'll notice from my stats & those of @MP99 that the connection is showing G.INP as activated.

Re: Asus router - data rate is 73% of max rate

MP99 — Mon, 05 Jul 2021 12:07:51 GMT

Thanks for pointer to 17070. A little steady buzz on there. Wired handset, but pretty old, so not sure if there's any chance it could be the handset?

What would the 72112 kbps figure be if it's not the sync speed?

cheers, Martin

Re: Asus router - data rate is 73% of max rate

pippincp — Mon, 05 Jul 2021 12:52:46 GMT

Report a noisy line.

Re: Asus router - data rate is 73% of max rate

licquorice — Mon, 05 Jul 2021 13:05:15 GMT

@MP99 wrote:

What would the 72112 kbps figure be if it's not the sync speed?

It is not your actual sync speed, it is the predicted maximum speed your line is capable of. The 52M figure is your actual sync speed.

Re: Asus router - data rate is 73% of max rate

MP99 — Mon, 05 Jul 2021 14:01:08 GMT

Ah - thank you.

How common is it for the sync & maximum speeds to be that far apart?

Cheers, Martin

Re: Asus router - data rate is 73% of max rate

imjolly — Mon, 05 Jul 2021 14:06:38 GMT

connection speed and sync speed are normally quite close but with line problems and/or constant resets of router that can cause DLM to reduce connection speed to try and stabilise your line . if you have line noise then report phone fault to 151

Re: Asus router - data rate is 73% of max rate

licquorice — Mon, 05 Jul 2021 14:09:00 GMT

Very unusual except under fault conditions. However, there is something odd with your stats in that with that amount of discrepancy in the figures I would expect your snrm to be very high yet it is 3.1.