Sky fibre gone live.

Living close to a street cab around 80 yards all provider checks suggested i should have no trouble reaching the top figure of the up to 76mb rate.
It went live yesterday and the figure says 66mb down and 19999 up. Can this change as i believe there is a sort of testing period.

It will most probably increase by around 10mbps if G.INP is enabled in the next couple of days.

I started on 55/20 and after 2 days went up to 68/20 with G.INP activation.

Just leave it alone and let DLM do it's thing.

Yep, wolvesmad are correct there! Leave it alone as DLM will do it own things to add extra 10Mbps if G.INP went enabled in a couple of days. You should get 80/20 no problem.

If it really is 80 yards then there is somethingh amiss. I would expect an max achievable to be well into the 90s or higher and actual sync to be someting like: 79.998 or 80.000

66 is more like a line that is well over 400m

Can you describe how it�s all connected up in your home ... extension wiring can be to the detriment of sync rates on VDSL.

I would note what Zarjaz has said and make sure your internal wiring is the best it can be. At that range it should have max sync even without G.INP enabled etc.

Edited by lockyatlrg (Wed 29-Jan-20 15:30:39)

In reply to a post by MHC:

If it really is 80 yards then there is somethingh amiss. I would expect an max achievable to be well into the 90s or higher and actual sync to be someting like: 79.998 or 80.000

66 is more like a line that is well over 400m

Well if its 400m thats the shortest 400m i have ever travelled.

That suggests there is an issue somewhere. Could be inside of outside your house.

Follow Zarjaz's comment first and see also if you can get full link stats.

In reply to a post by Zarjaz:

Can you describe how it�s all connected up in your home ... extension wiring can be to the detriment of sync rates on VDSL.

The master socket is a filtered alien nation face plate, comes in close to the bedroom on landing window,router plugged straight into this.
Its only the SR102 router no idea if this matters, not as clued up as the helpers on here

Edited by deleted (Wed 29-Jan-20 17:50:49)

In reply to a post by boathouse:

Well if its 400m thats the shortest 400m i have ever travelled.

Or you aren't looking at your/an FTTC cabinet/PCP?

Edited by RobertoS (Wed 29-Jan-20 18:10:33)

OK, that sounds like it ought to be ideal then....

I believe Sky have an app to check speeds and stuff, it will also initiate a line test and raise faults with Openreach if any of these don�t come back as OK.

In reply to a post by RobertoS:

In reply to a post by boathouse:

Well if its 400m thats the shortest 400m i have ever travelled.

Or you aren't looking at your/an FTTC cabinet/PCP?

Well i know i am looking at FTTC cabinet, 2 new taller ones have been installed next to the original smaller cab which has been there donkeys years and still in use. BT lad told me 9 months ago they are for fibre connections.

Edited by deleted (Wed 29-Jan-20 18:46:11)

The SR102 has stats under Show Statistics which is at the bottom on the maintenance tab..

Username will be admin and password sky.

In reply to a post by Zarjaz:

OK, that sounds like it ought to be ideal then....

I believe Sky have an app to check speeds and stuff, it will also initiate a line test and raise faults with Openreach if any of these don�t come back as OK.

OK thanks.
I have upgraded from sky ADSL but they would not give me one of the newer routers as they said My SR102 will be fine but the wifi is rubbish on mine as well, but i always do checks when connected to wired connection.
Also one check with BT said i could get around 135mb on a ultrafast package (i think thats what they called it)

Edited by deleted (Wed 29-Jan-20 18:53:50)

That suggests your cabinet has a service called G.fast available, and the 135 Mbps is probably the estimate for that service.

May not be yours though.

I've got a cabinet 75m away from my house. I'm connected to one 350m away.

The way BT route lines can be weird and wonderful some times. Could go all round the block before it gets to you.

Some attenuation stats will give us an idea of the line length.

Edited by wolvesmad (Wed 29-Jan-20 21:25:53)

In reply to a post by adslmax:

if G.INP went enabled in a couple of days.

Whats G.INP?

In reply to a post by Zarjaz:

..

I believe Sky have an app to check speeds and stuff, .

They have a test my line option when i sign into my account, is this what you mean

Yep, I think so......

In reply to a post by boathouse:

Whats G.INP?

https://www.increasebroadbandspeed.co.uk/g.inp

https://kitz.co.uk/adsl/retransmission.htm

In reply to a post by boathouse:

Living close to a street cab around 80 yards all provider checks suggested i should have no trouble reaching the top figure of the up to 76mb rate.
It went live yesterday and the figure says 66mb down and 19999 up. Can this change as i believe there is a sort of testing period.

Could be that possible gas pipe laying issue which you mentioned in another thread...

Sky used to provide the Q hub (ER110 or ER115) for lines that connect faster than 40/10. If Sky won't provide you with one there are plenty on Bay of E for less than £20. Both have the benefit of being dual band. Altrnatively, sign up for the "Broadband Boost" package for an extra £5 a month and they will send you the latest SR203 hub.

wouldn't the max upload be the key here that something may be wrong ?

In reply to a post by Taras:

wouldn't the max upload be the key here that something may be wrong ?

How so? 66/20 is a perfectly normal sync speed.

Well it seems the line dropped during the night and came back like this


Router Statistics
System Up Time: 48:02:37
Port Status TxPkts RxPkts Collision Pkts Tx b/s Rx b/s Up Time
WAN MER 2861663 8210611 0 98554 5212452 14:49:00
LAN Up 105870 77194 0 221264 17103 48:02:37
WLAN Up 23604241 8073614 0 5262742 89831 48:02:05
Broadband Link Downstream Upstream
Connection Speed (Kbps) 76767 19999
Line Attenuation (dB) DS1:7.3 DS2:15.5 DS3:23.6 US0:2.6 US1:11.9 US2:17.0
Noise Margin (dB) DS1:6.4 DS2:6.4 DS3:6.3 US0:15.5 US1:15.4 US2:15.4
Poll Interval:
Seconds (at least 3s):
Set Interval Stop

With those attenuation figures I would say your line is about 340 meters long and you're connecting about right now. Leave the connection on and the DLM will start to lower your SNR and you will get max sync in about a week or two.

Crosstalk will be pulling your line down like many other FTTC lines now.

In reply to a post by lockyatlrg:

With those attenuation figures I would say your line is about 340 meters long and you're connecting about right now. Leave the connection on and the DLM will start to lower your SNR and you will get max sync in about a week or two.

Crosstalk will be pulling your line down like many other FTTC lines now.

I had a word this morning with a BT lad working on another cabinet, and he said the route to your house can sometimes take a little detour which can add a longer line from the cab to the house.Between me and the cabinet is a small cul de sac so maybe it takes a diversion.

But i am more than happy with 76mb.

@lockyatlrg I don't think his line isn't 340m more likely less than 220m to 210m than mine!


Line Attenuation (dB) DS1:7.3 DS2:15.5 DS3:23.6 US0:2.6 US1:11.9 US2:17.0
- boathouse line length 220m FTTC 76767k 19999k @ SNR 6.4dB

Line Attenuation (dB) DS1:6.8 DS2:15.8 DS3:26.1 US0:2.5 US1:13.1 US2:20.4
- adslmax line length 250m FTTC 79999k/19999k @ SNR 8.2dB

Edited by adslmax (Thu 30-Jan-20 22:56:45)

Mine length estimate is just a guess from lines i've seen, I could be well out.

Because if his line 340m away like u say then my G.fast will be no chance! As my G.fast are 229/50 with my VDSL2 line length at 250m but openreach say my G.fast line length is 280m away.

Your signature say G.fast 360m are wrong because otherwise G.fast won't be on your BTw checker!

Edited by adslmax (Thu 30-Jan-20 23:01:33)

It's not. The engineer said my DP was 330 meters and my line to my house is another 30 meters.

Very odd as normally BTWholesale will NOT selling any G.fast if line length is over 300m - look like my G.fast is 220m away not 280m cos my VDSL2 is 250m away. Easy to get mix up with line length

Edited by adslmax (Thu 30-Jan-20 23:26:58)

Mine is according to google map (dsl cable route to the pcp cabinet from back garden to the cabinet - not straight line)

831 ft - 253.1 metres line length - VDSL2
929 ft - 283.1 metres line length - G.fast or
732 ft - 223.1 metres line length - G.fast

Edited by adslmax (Fri 31-Jan-20 00:44:55)

In reply to a post by adslmax:

Very odd as normally BTWholesale will NOT selling any G.fast if line length is over 300m - look like my G.fast is 220m away not 280m cos my VDSL2 is 250m away. Easy to get mix up with line length

BTWholesale don't pick who to sell G.Fast to, it's OpenReach.

There's no arbitrary cut off distance either. Not 300m or 350m.
The only thing that matters is the sync speed.

If a line is 400m and syncs at 130Mb/s on G.Fast then OpenReach will sell it.
If a line is 250m but only syncs at 90Mb/s then OpenReach won't sell it.

You're obsessing with the exact distance for some reason. It doesn't matter much.
You can be told a distance by 1 engineer and the very next day a different engineer could have a different figure.

I wouldn't expect a GEA test and and engineer to give the exact same figures either.
It depends on a number of factors including what test equipment is being used to measure line length.

My last couple GEA tests estimated line length varied by nearly 50m between the 2 tests.

12 days since fibre went live, very stable so would it be ok now to switch my sky102 router to the sky ER115

In reply to a post by boathouse:

12 days since fibre went live, very stable so would it be ok now to switch my sky102 router to the sky ER115

Neither of those Sky supplied routers are great (in my opinion).

Edited by deleted (Sun 09-Feb-20 08:52:52)

In reply to a post by dect:

In reply to a post by boathouse:

12 days since fibre went live, very stable so would it be ok now to switch my sky102 router to the sky ER115

Neither of those Sky supplied routers are great (in my opinion).

No maybe not but thats all i have at present. Can you recommend a modem/router at not a high price?
I was looking at a Tp link one like this

https://www.ebay.co.uk/itm/TP-Link-Archer-VR400-AC12...

ER115 is much better than the 102.

Yes that will work,its slightly cheaper on Amazon if you have Prime, Amazon also great for returns if you find it's not for you.
https://www.amazon.co.uk/Wireless-Connections-Infini...

Ok thanks for replies i will take note, but its 13 days now since fibre went live, so would it be fine now to replace the SR102 with the ER115, line has been very stable.

In reply to a post by boathouse:

Ok thanks for replies i will take note, but its 13 days now since fibre went live, so would it be fine now to replace the SR102 with the ER115, line has been very stable.

Yes.

In reply to a post by boathouse:

Can you recommend a modem/router at not a high price?

Just remember Sky FTTC needs (unless things have changed) a router that allows you to enter your Sky Broadband Username and Password in DHCP Option 61

Edited by deleted (Sun 09-Feb-20 15:09:32)

It's still the same but TP-Link routers allow you too Choose Sky-MER as your provider and you can then enter Option 61 details, no need to extract password anymore, anything will do as long as in correct format.

In reply to a post by gmangt4:

It's still the same but TP-Link routers allow you too Choose Sky-MER as your provider and you can then enter Option 61 details, no need to extract password anymore, anything will do as long as in correct format.

Thanks for confirming, does make a joke of Sky still using Option 61 when they don't even bother authenticating the details.

In reply to a post by boathouse:

No maybe not but thats all i have at present. Can you recommend a modem/router at not a high price?
I was looking at a Tp link one like this

https://www.ebay.co.uk/itm/TP-Link-Archer-VR400-AC12...

Remember that the TP-Link interface is a bit restricted and if you want to run a monitoring program like DSLStats you need to use customised firmware. There is a topic on the Kitz forum about that (including Janet and John steps about how to make the changes).

In reply to a post by GonePostal:

In reply to a post by boathouse:

No maybe not but thats all i have at present. Can you recommend a modem/router at not a high price?
I was looking at a Tp link one like this

https://www.ebay.co.uk/itm/TP-Link-Archer-VR400-AC12...

Remember that the TP-Link interface is a bit restricted and if you want to run a monitoring program like DSLStats you need to use customised firmware. There is a topic on the Kitz forum about that (including Janet and John steps about how to make the changes).

Will check it out thanks. Any other modem/routers around the TP link level i could consider as long as it has the option 61 setting?

Edited by deleted (Sun 09-Feb-20 16:48:27)

In reply to a post by j0hn83:

In reply to a post by boathouse:

Ok thanks for replies i will take note, but its 13 days now since fibre went live, so would it be fine now to replace the SR102 with the ER115, line has been very stable.

Yes.

Swaped the SR102 for a ER115 and it syncs at the same down/up speed as before but doing a speedtest on various sites its slower than the SR102, its now around 30/35mbs down and 18mbs up. I will have to swap back to the SR102 to see if its the router or something else it may be?

click the Connection Status tab next to Show Statistics.

Disconnect the DSL for about 5 mins and reconnect to force a new IP and that will restore your throughput. it's some kind of wired issue with sky..

In reply to a post by lockyatlrg:

click the Connection Status tab next to Show Statistics.

Disconnect the DSL for about 5 mins and reconnect to force a new IP and that will restore your throughput. it's some kind of wired issue with sky..

Ok thanks for the reply, just done that and first test was 57mb down 18mb up, did another on another site and that was 66mb down and 18.3mb up,want it back to 72mb down i got with the SR102 on previous speedtest results.

In reply to a post by boathouse:

In reply to a post by lockyatlrg:

click the Connection Status tab next to Show Statistics.

Disconnect the DSL for about 5 mins and reconnect to force a new IP and that will restore your throughput. it's some kind of wired issue with sky..

Ok thanks for the reply, just done that and first test was 57mb down 18mb up, did another on another site and that was 66mb down and 18.3mb up,want it back to 72mb down i got with the SR102 on previous speedtest results.

Well i am synced at 77317 down, 19999 up and this is my latest speedtest result. Is this around what i should expect all being well.

down 73.7mbps up 18.9mbps


https://imgur.com/Xsin2py

Edited by deleted (Wed 12-Feb-20 18:00:02)

In reply to a post by boathouse:

In reply to a post by boathouse:

In reply to a post by lockyatlrg:

click the Connection Status tab next to Show Statistics.

Disconnect the DSL for about 5 mins and reconnect to force a new IP and that will restore your throughput. it's some kind of wired issue with sky..

Ok thanks for the reply, just done that and first test was 57mb down 18mb up, did another on another site and that was 66mb down and 18.3mb up,want it back to 72mb down i got with the SR102 on previous speedtest results.

Well i am synced at 77317 down, 19999 up and this is my latest speedtest result. Is this around what i should expect all being well.

down 73.7mbps up 18.9mbps


https://imgur.com/Xsin2py

This is my internet speed test https://i.imgur.com/6XC1WI7.jpg

Download 80.4 Mbps Upload 20 Mbps

Line 1
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 6.40 15.40
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60

This is how it is supposed to be!

In reply to a post by BLaZiNgSPEED:

In reply to a post by boathouse:

In reply to a post by boathouse:

... nested quotes trimmed ...

Ok thanks for the reply, just done that and first test was 57mb down 18mb up, did another on another site and that was 66mb down and 18.3mb up,want it back to 72mb down i got with the SR102 on previous speedtest results.

Well i am synced at 77317 down, 19999 up and this is my latest speedtest result. Is this around what i should expect all being well.

down 73.7mbps up 18.9mbps


https://imgur.com/Xsin2py

This is my internet speed test https://i.imgur.com/6XC1WI7.jpg

Download 80.4 Mbps Upload 20 Mbps

Line 1
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 6.40 15.40
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60

This is how it is supposed to be!

Your line attention is 17.90 and noise margin is 6.40 down ?

My line attention is 7.5 and noise is 6.5 down, so with my attention only 7.5 down is my line shorter from the street cab?

In reply to a post by boathouse:

In reply to a post by BLaZiNgSPEED:

In reply to a post by boathouse:

... nested quotes trimmed ...

Well i am synced at 77317 down, 19999 up and this is my latest speedtest result. Is this around what i should expect all being well.

down 73.7mbps up 18.9mbps


https://imgur.com/Xsin2py

This is my internet speed test https://i.imgur.com/6XC1WI7.jpg

Download 80.4 Mbps Upload 20 Mbps

Line 1
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 6.40 15.40
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60

This is how it is supposed to be!

Your line attention is 17.90 and noise margin is 6.40 down ?

My line attention is 7.5 and noise is 6.5 down, so with my attention only 7.5 down is my line shorter from the street cab?

If your line attentuation is indeed 7.5 dB you are definitely supposed to be syncing in at 80000kbps. Have you checked https://www.dslchecker.bt.com/adsl/ADSLChecker.Addre... ?
This should give you high and low. My cabinet is around 290 meters from my home. Approximately 250 meters to the entrance of my building with another 40 or so meters up to the 14th floor where I live.

There are people managing to sync in at 80 Mbps with 470 meters to street cabinet. If crosstalk is a problem then this can reduce internet speeds. Make sure your internal wiring at home is good and that you have a VDSL Faceplate installed in the master socket if you haven't got one already. This gets rid of the need to use a micro filter. An Openreach engineer came to my home as part of the upgrade to install one for free with TalkTalk.

The VDSL Faceplate should make a big difference to speeds and noise margins. Of-course noise margins are not necessarily indicators of shorter or longer lines, it is more to do with line stability. Generally the shorter the line the higher the noise margins as less noise is being accumulated.

If you only just signed up then you may have to wait for a few days so your router syncs at 80000 Kbps. But make sure you have the VDSL Faceplate installed, if you haven't got it already.

In reply to a post by BLaZiNgSPEED:

In reply to a post by boathouse:

In reply to a post by BLaZiNgSPEED:

... nested quotes trimmed ...

This is my internet speed test https://i.imgur.com/6XC1WI7.jpg

Download 80.4 Mbps Upload 20 Mbps

Line 1
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 6.40 15.40
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60

This is how it is supposed to be!

Your line attention is 17.90 and noise margin is 6.40 down ?

My line attention is 7.5 and noise is 6.5 down, so with my attention only 7.5 down is my line shorter from the street cab?

If your line attentuation is indeed 7.5 dB you are definitely supposed to be syncing in at 80000kbps. Have you checked https://www.dslchecker.bt.com/adsl/ADSLChecker.Addre... ?
This should give you high and low. My cabinet is around 290 meters from my home. Approximately 250 meters to the entrance of my building with another 40 or so meters up to the 14th floor where I live.

There are people managing to sync in at 80 Mbps with 470 meters to street cabinet. If crosstalk is a problem then this can reduce internet speeds. Make sure your internal wiring at home is good and that you have a VDSL Faceplate installed in the master socket if you haven't got one already. This gets rid of the need to use a micro filter. An Openreach engineer came to my home as part of the upgrade to install one for free with TalkTalk.

The VDSL Faceplate should make a big difference to speeds and noise margins. Of-course noise margins are not necessarily indicators of shorter or longer lines, it is more to do with line stability. Generally the shorter the line the higher the noise margins as less noise is being accumulated.

If you only just signed up then you may have to wait for a few days so your router syncs at 80000 Kbps. But make sure you have the VDSL Faceplate installed, if you haven't got it already.

Been activated now for 16 days and already have filtered face plate, but not the best of routers, sky ER115

https://imgur.com/cyWJO8k

Edited by deleted (Wed 12-Feb-20 19:52:19)

In reply to a post by boathouse:

In reply to a post by BLaZiNgSPEED:

In reply to a post by boathouse:

... nested quotes trimmed ...

Your line attention is 17.90 and noise margin is 6.40 down ?

My line attention is 7.5 and noise is 6.5 down, so with my attention only 7.5 down is my line shorter from the street cab?

If your line attentuation is indeed 7.5 dB you are definitely supposed to be syncing in at 80000kbps. Have you checked https://www.dslchecker.bt.com/adsl/ADSLChecker.Addre... ?
This should give you high and low. My cabinet is around 290 meters from my home. Approximately 250 meters to the entrance of my building with another 40 or so meters up to the 14th floor where I live.

There are people managing to sync in at 80 Mbps with 470 meters to street cabinet. If crosstalk is a problem then this can reduce internet speeds. Make sure your internal wiring at home is good and that you have a VDSL Faceplate installed in the master socket if you haven't got one already. This gets rid of the need to use a micro filter. An Openreach engineer came to my home as part of the upgrade to install one for free with TalkTalk.

The VDSL Faceplate should make a big difference to speeds and noise margins. Of-course noise margins are not necessarily indicators of shorter or longer lines, it is more to do with line stability. Generally the shorter the line the higher the noise margins as less noise is being accumulated.

If you only just signed up then you may have to wait for a few days so your router syncs at 80000 Kbps. But make sure you have the VDSL Faceplate installed, if you haven't got it already.

Been activated now for 16 days and already have filtered face plate, but not the best of routers, sky ER115

https://imgur.com/cyWJO8k

This is mine and it is very similar to yours.

WBC SOGEA Availability Date
High Low High Low
VDSL Range A (Clean) 80 68.2 20 19 62.1 Available --
VDSL Range B (Impacted) 80 65.1 20 19 56.6 Available --

My stats are slightly lower. My cabinet is 20 Bishopsgate and is located 46 Frostic Walk, Shadwell, London E1 5LT so when I inputted that in Google Maps for directions I see it adds up to 0.2 miles but total when connecting and adding it altogether it adds up to around 290 meters.

Your cabinet should also be around 300 meters or less judging by those stats. If you are seeing High 80 then your router should be syncing at 80000 or 79999 Kbps.

That Sky router is not the best especially if you are using WiFi. But it does have 2 Gigabit Ethernet LAN ports so I don't understand why you're not syncing at full speeds.

You haven't been turning off the router on and off during those days? Because this can make DLM think your line is unstable and increase your noise margins.

First few days when my service with TalkTalk went live on the 5th of February I was getting only 68 Mbps even when my router was syncing at 80000Kbps. But since yesterday my speeds went up to 75+ Mbps and sometimes hitting 80 Mbps on Internet Frog and 78.5 Mbps on Which Broadband Speed Test.

The VDSL Faceplate should make a big difference to speeds and noise margins. Of-course noise margins are not necessarily indicators of shorter or longer lines, it is more to do with line stability. Generally the shorter the line the higher the noise margins as less noise is being accumulated.

There are some �untruths� in this paragraph.

A VDSL faceplate will only make a difference if there is extension wiring attached to the NTE.

�the shorter the line the higher the noise margin� Not true. The noise margin will attempt to achieve its preset target margin.... (there�s more to it than that, but essentially that�s the gist)

The TP Link Archer is a good modem, it's got a decent broadcom chipset but the wireless on it isn't great. 5Ghz performance on it was really poor imo.

Being on a Huawei cab, I plugged in my old Huawei HG612 and bought a seperate cable router.

It's been rock solid. You're doing well getting full speed on that attenuation. It must be a nice clean line with little crosstalk.

17db my attenuation. 68/20mbps.

Probably the activation of G.INP and potentially an SNR reduction by DLM.

G.INP generally causes a 10mbps leap in sync speed.

Still very happy with a sync of 77mbps and speedtest of 73mbps

In reply to a post by Zarjaz:

The VDSL Faceplate should make a big difference to speeds and noise margins. Of-course noise margins are not necessarily indicators of shorter or longer lines, it is more to do with line stability. Generally the shorter the line the higher the noise margins as less noise is being accumulated.

There are some �untruths� in this paragraph.

A VDSL faceplate will only make a difference if there is extension wiring attached to the NTE.

�the shorter the line the higher the noise margin� Not true. The noise margin will attempt to achieve its preset target margin.... (there�s more to it than that, but essentially that�s the gist)

The VDSL Faceplate isolates the broadband from the telephone line and the orange ring wire. This should help eliminate any noise on the line. This is what the BT Openreach engineer told me when he came on the 3rd of February to install the Faceplate MK4.

Yeah, it is true that the noise margin will attempt to achieve the preset target margin. But it is also true that if there is line and the internet drops out, DLM will increase the noise margin to stabilize the connection and in the process this will lower the speed.

Generally speaking if you are able to achieve top speeds with a noise margin of 3-6 dB then you have a really clean line.

I only just moved to FTTC from ADSL on the 3rd of February. Before that I had ADSL at 12 Mbps with a noise margin of 9 dB because at 3 or 6 dB under ADSL my internet would drop out quite frequently like 2-5 times a day.

That was EO Line with a 1320 meters copper line to the exchange. But now with the FTTC cabinet that copper length has been slashed down to less than 300 meters.

This means that now under FTTC I have around a thousand meters less copper cable traveling from the cabinet to my property. Which is why now my line seems to be achieving stable sync with a 6.40 dB noise margin for the last 6 days or so. Previously this was impossible to achieve because that long 1000 meter copper line would collect a lot of noise on the line.

My understanding is if the router is syncing at 80000 Kbps and 19999 Kbps with a 6dB noise margin profile then DLM will not need to lower it down to 3dB as it is happily syncing at top speeds at 6dB.

In reply to a post by wolvesmad:

The TP Link Archer is a good modem, it's got a decent broadcom chipset but the wireless on it isn't great. 5Ghz performance on it was really poor imo.

Being on a Huawei cab, I plugged in my old Huawei HG612 and bought a seperate cable router.

It's been rock solid. You're doing well getting full speed on that attenuation. It must be a nice clean line with little crosstalk.

17db my attenuation. 68/20mbps.

Yes, indeed there seems to be little crosstalk, perhaps because my cabinet went live in October 2019 and many people in my building are unaware that there is Fibre. I am probably the first and only person to have identified my cabinet going live on the 1st of October. So with less people being on FTTC and most of them being tenants they are probably not informed yet.

Crosstalk might affect me after 1-2 years, who knows. But as long as most people in my building living as tenants then hopefully they are less likely to subscribe to an FTTC package and therefore less likely to contribute to crosstalk!

The OpenReach FTTC DLM is different to the BT Wholesale ADSL DLM.

Every line on ECI cabinets has a fixed 6dB target SNRM.

Every line on Huawei cabinets starts at a 6dB SNRM target.
If a line is stable enough the DLM can lower it to 5dB, 4dB or 3dB.

Unlike ADSL there is no 9dB or 12dB on the OpenReach DLM for FTTC.

Upstream target SNRM is always 6dB.

Important to note that the target SNRM and your current SNRM are not the same thing.
A modem should try sync at the target SNRM, but the current SNRM can move up or down after sync.

My understanding is if the router is syncing at 80000 Kbps and 19999 Kbps with a 6dB noise margin profile then DLM will not need to lower it down to 3dB as it is happily syncing at top speeds at 6dB.

Correct.
Your line is only just syncing at 80Mb.
It's likely as more take up FTTC on your cabinet that crosstalk will reduce your sync.
At this point DLM may reduce the target SNRM and get you right back to 80Mb.

Upstream target SNRM is always 6dB.

But in my case the Upstream SNRM is 15.40dB
https://i.imgur.com/0oZtZHE.jpg
It has been that way from the very beginning
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 6.30 15.40

6dB should be the target, but I am guessing since my router is syncing at the max 19999 upload at 15.40dB that too should happily stay that way unless crosstalk comes to lower the speed and DLM tries to drop it down.

The only tiny fluctuation I see is for download noise margin. On rare occasions it would hover between 6.30 to 6.40dB. While Upstream has been rock solid at 15.40dB.

This points to some very stable noise margins. With ADSL the noise margin would constantly fluctuate at every refresh of my router stat page.

My line Attenuation was 25.5dB with ADSL and with FTTC it's down to 17.90dB.