Line syncing at 75mbps, never receive more than 66mbps.

[kargo]

Hi all,

Since moving into a new property in 2019 and my Sky Talk/Fibre being installed,  I have had this issue and have never been able to discover the reason.     My line is syncing at 75399kbps and usually does so,  sometimes reaches 79999kbps - yet I have never been able to receive more than around 66mbps in speed when connected by both wifi and ethernet. 

It's almost as if something is capped but I'll always be receiving at least 9mbps less than what the router is syncing at.  I appreciate that there's always going to be some speed loss but in my previous property, this was no more than 1mbps (I'd sync at 80 and receive 78.5-79).

The only difference is my previous place had a VDSL faceplate and this is using filters.  I've experimented with a different filter but this didn't make a difference.   Not that I expected it to as the line is syncing at a good speed and exactly what I was quoted by Sky - 74mbps. 

I'm using the ER115 router with firmware version 4.12.0203.R.   Is there perhaps a setting in the router that needs changing?

[cookiemonsteruk]

@kargo 

If you are using ethernet you would expect a drop in speed from the line speed of 5-10% on your devices

Using 5ghz wifi that drop could be 10-20%

Using 2.4ghz wifi the drop could be as much as 20-50%

,

These are network overheads that involve adding extra bits to direct the traffic to the correct device on your lan

[jamesn123]

@kargo 

That is an expected amount of loss for a VDSL line. My line syncs at 80mbps but I can only get around 72mbps via a speedtest. 

[Mr+Slant]

From memory (and its been a while) you will have between 8 and 14% overheads on a non-vectored VDSL line depending on interleave depth and whether g.INP has been enabled. 74Mbps is about the maximum IP layer speed obtainable on an 80Mbps sync speed.

The OP couldn't ever have got the figures they claimed so I assume their memory is failing them 🙂

[jamesn123]

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@Mr+Slant wrote:

From memory (and its been a while) you will have between 8 and 14% overheads on a non-vectored VDSL line depending on interleave depth and whether g.INP has been enabled. 74Mbps is about the maximum IP layer speed obtainable on an 80Mbps sync speed.

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Not sure if thats quite right. I used to get 76-77mbps on a previous line & property. This was a long time ago when the area & fibre cabinet was quiet. 

[Mr+Slant]

It was at one point in time but not now (again from memory) as the power profiles on the Huawei boxes have changed. Might still be possible to get 76Mbps on an ECI cab if you're one of the very few people with g.INP enabled.

Anyway no chance of getting 78.5-79Mbps at the IP layer under any scenario whatsoever with an 80Mbps sync on any VDSL system in the world so OP is misremembering 🙂

[jamesn123]

Ah you could be right there perphaps I was on a different cab previously. Yeah no chance of 79mbps.