Moved: DSL-N16 Packet Loss Hi guys. I’ve been having packet loss issues on the upstream part of my FTTC (VDSL2) line, in the UK. I can test this by looking at the amount of...

[UK Sentinel]

802.11a is an older protocol which uses the 5 GHz and has a theoretical max speed of 54 Mbps but in reality 20 Mbps is more common

Do you still get packet loss when testing with other device  (mobile phone) ?

What other routers have you tried  ?

 

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[Betatester548]

I’ve realised that the speed test I’m using is probably either too sensitive, or possibly giving incorrect results. I only seem to get retransmission errors when I have higher upload sync speeds set on my router. Here is Mlab’s test:

https://speed.measurementlab.net/#/

I tested my connection at default sync settings and only got a tiny amount of packet loss in Google Stadia (less than 0.01%). Prioritising upstream packets via the QOS page seemed to resolve packet loss issues on Stadia.

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[UK Sentinel]

Great news

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[Betatester548]

Could you try running the Mlab test please, and let me know what results you get?

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[UK Sentinel]

No problem, I used the Mlab tool and results below.

FYI: As my Son and I game, we have our set-up optimised for Gaming etc, and I do not use a DSl-N16

 

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   Mlab.png
   

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[Betatester548]

I wonder if a certain amount of packet loss is considered normal / fine on most FTTC/VDSL2 connections in the UK?

This graphic (admittedly from 2012) shows packet loss on various FTTC providers and Virgin Media’s network (see attachment).

My ISP (Cuckoo Broadband) uses Talktalk Business for their network backhaul apparently (same DNS servers too).

Which ISP are you using?

Note –  I’ve also tried altering the MTU settings on my router and network adapter, but no luck.

 

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   packetloss_uk_broadband_isps_may2012.jpg
   

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[UK Sentinel]

Betatester548 wrote:

I wonder if a certain amount of packet loss is considered normal / fine on most FTTC/VDSL2 connections in the UK?

The primary cause of network packet loss is congestion and anything above 1% should be of concern, for myself in a built up area, I expect no packet loss.

I am with BT and was with Plusnet, both good for service etc.

DSL-N16 was good for ADSL, not so good for VDSL.

What routers have you tried before ?

 

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[Betatester548]

I’ve tried a couple of Broadcom  based (Technicolor) routers. I’ve also got a TP Link VR200 with a Lantiq chipset. These routers all got some packet loss on the Mlab test on my line. I think there was some in game streaming services like google Stadia too.

With my Asus router, the line has been set to 9dB for both the downstream and upstream about 2 days ago, by Openreach’s DLM. I’ve got no CRC errors reported. With Telnet I can see some FEC errors, but these are not going up very often (not increasing whenever I use the connection).

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[UK Sentinel]

Did the TP Link VR200 have any CRC errors ?

9dB which will provide a better quality connection, but I am sure DLM will kick in after a few days and adjust downwards – do you still get packet loss even with the higher SNR ?

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[Betatester548]

I tried it about a week ago. It did has some initially (a few thousand if I recall) when it connected, at least with Bitswap enabled.

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[UK Sentinel]

That is a tad high, when you plug in Cuckoo Broadband hub, do u still have CRC etc ?

 

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[Betatester548]

I do think it’s very strange that however small I set the MTU on my network adapter, there is always some packet loss (without altering any fundamental VDSL settings).

Lowering the MTU on the network adapter to 500 actually increases packet loss to anywhere between 2% to 11%.

This test doesn’t report actual packets lost though, only retransmission.

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[UK Sentinel]

Does Cuckoo Broadband hub, report CRC errors ?

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[Betatester548]

When I limit the upstream sync speed (frequency) heavily though (I think between 500-100kbps), the packet loss is always 0% (tested 5 times in a row).

I’m beginning to think the upstream signal just isn’t strong enough to provide higher upstream rates completely reliably. The line attenuation for the upstream bands is 18.5db and 28.9db.

I’m unsure if any of the routers I have would help to improve the attenuation.

I think we’d need an Openreach engineer to look at the line, and possibly the wiring in my street. I’m guessing that would cost hundreds.

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[UK Sentinel]

MediaTEK based DSL chipsets are no good beyond 30-35dB attenuation, this is why I ask about your Cuckoo Broadband hub and CRC’s etc.

if BT engineer finds fault then there is no charge, hence If ISP hub is in and reporting errors and this is effecting calls or voip etc, then Cuckoo can ask for Engineer visit

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