BT Infinity & FTTx Discussion

TJM said:
It's a bit odd that you have a line speed of 91Mbps but the connection speed can't hit the maximum. Have you tried resyncing since the speed dropped? If so and it didn't help, just leave it alone and the DLM will slowly sort itself out if it can.
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DLM was start to trigger when openreach engineer working at the cabinet.
 
bulldog147 said:
In 2014 the engineer say I was the first customer on Fibre at the cabinet. He show me the tool that had the maximum rate of 124Meg down and 42Meg up.
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Yeah max attainable upload on the normal 17a profile is around upto ~35mbit for most people - I'm assuming the guy who installed ours was showing the theoretical max for a 30a profile.
 
TJM said:
It's a bit odd that you have a line speed of 91Mbps but the connection speed can't hit the maximum. Have you tried resyncing since the speed dropped? If so and it didn't help, just leave it alone and the DLM will slowly sort itself out if it can.
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Eh, my router's maximum sync rate has slowly crept up over the last month but the actual sync speed and speed I get when downloading have dropped slightly.
 
@bulldog147

Have you checked your phone line for noise using Quiet Line Test? That's quite a bit of interleaving there with g.inp on as well. As others have said, it does appear that you've got some bad crosstalk there, or some seriously bad faults on the line that needs clearing up.
 
Never been charged for using it personally. Don't think that's changed lately either. :) (I'm using BT by the way)

17070, then option 2.

It should basically be silent, baring some really quiet high frequency noise (like the old modem screeches, but very quietly). If there's crackling on the line, that needs to be looked into by calling your line provider.
 
If that's the case, then the likelihood that another subscriber along the same path as your line is causing major crosstalk interference. The SNR you have shouldn't be that high with that high a margin (well above 6), and being unable to connect at full speed. Something will have caused the DLM to shunt you down. Only hope if this is the case that they get their line sorted, otherwise you'll never be free of it.

In case it's not. As someone else suggested above though, you could try resync'ing to get a higher connection. But the key thing to remember is this:

When you resync, shut down the modem/router, pull the phone line out, and wait for a minimum of 30 minutes BEFORE you reconnect everything back in. Any time less than this and DLM see's it potentially as a fault to be added to it's collection of fault views on your line. But 30 minutes tells DLM to ignore it and treat it as a break point to retry anew without adding to DLM checks (and push speeds further down). Depending on how long ago it was your speed went down, I would suggest givining a certain amount of days before you attempt this so DLM can normalise things out before it sees your 30 min downtime. So if it was 8 days ago, wait another 8 days before trying this.
 
Meddling-Monk said:
When you resync, shut down the modem/router, pull the phone line out, and wait for a minimum of 30 minutes BEFORE you reconnect everything back in. Any time less than this and DLM see's it potentially as a fault to be added to it's collection of fault views on your line. But 30 minutes tells DLM to ignore it and treat it as a break point to retry anew without adding to DLM checks (and push speeds further down). Depending on how long ago it was your speed went down, I would suggest givining a certain amount of days before you attempt this so DLM can normalise things out before it sees your 30 min downtime. So if it was 8 days ago, wait another 8 days before trying this.
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What about the loss of power cut when i am not in the house and the power restored might cause this worse on DLM?
 
If the loss of power was restored in less than 30 minutes, there's a chance DLM may see it as a "fault" and add it to it's calculations on whether to drop you further in speed and add more interleaving, etc. So long as the "power off" stage is 30+ minutes, DLM won't take it into calculations on your line. So any resync attempts you make should factor this extra time needed (ie, so everyone in the household knows there's no net at that time).
 
My parents have BT FTTC connected to a Huawei cabinet approximately 1km away. I recently relocated the mastersocket upstairs (reducing the line length) and upgraded it to a NTE5C with VDSL faceplate, they have no internal wiring. The old unlocked HG612 used to sync at 38/42Mbit down and 10Mbit up. This was connected to a TP-Link router which struggled to supply WiFi coverage throughout due to thick old walls.

They recently received a HH6 so I swapped the HG612 and relocated the TP-Link downstairs which has greatly improved the WiFi, but the sync speeds the HH6 achieves is fairly rubbish at:

2py2lok.jpg


Yet the attainable the reported attainable rate can be achieved with the HG612. When I plugged the HG612 into the new socket it synced at 48Mbit, I’ll need to see tomorrow what it syncs at. Any recommendations apart from ditch the HH6 and buy another VDSL2 router? I’m reluctant to do so and find the sync speeds are the same as the HH6s :(.
 
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Grab a nice and cheap Broadcom VDSL2 modem like the TP Link W9970, it's fairly robust for a modem/bridge unit. I've had to switch over to this from a HH5a that refused to go anywhere near it's max speed, as well as the continuous disconnections from the HH5a phoning home all the time (every week). Causing further speed reductions from DLM kicking in and seeing it as a fault. Price shouldn't be that heavy, around £30 I think. But should do the job of improving on the HH series.
 
^

Yes I agree. HH5a and Plusnet Hub One will reduced sync rate and kick in DLM. (both should be replaced to different router otherwise loads of unhappy from BT and Plusnet customers blame ISP of poor speed not aware of any DLM kick in)
 
Meatball said:
My parents have BT FTTC connected to a Huawei cabinet approximately 1km away. I recently relocated the mastersocket upstairs (reducing the line length) and upgraded it to a NTE5C with VDSL faceplate, they have no internal wiring. The old unlocked HG612 used to sync at 38/42Mbit down and 10Mbit up. This was connected to a TP-Link router which struggled to supply WiFi coverage throughout due to thick old walls.

They recently received a HH6 so I swapped the HG612 and relocated the TP-Link downstairs which has greatly improved the WiFi, but the sync speeds the HH6 achieves is fairly rubbish at:



Yet the attainable the reported attainable rate can be achieved with the HG612. When I plugged the HG612 into the new socket it synced at 48Mbit, I’ll need to see tomorrow what it syncs at. Any recommendations apart from ditch the HH6 and buy another VDSL2 router? I’m reluctant to do so and find the sync speeds are the same as the HH6s :(.
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I had exactly the same happen to me. I was on HH5 and when I got my super duper Smart hub I plugged it in and watched my speed dwindle away over the next week.
It went from 51Mbps to 20 Mbps. I then plugged my HH5 back in and left it connected for 2 weeks hoping DLM would bring my line back up to speed but it never. I got the DLM reset in the end and was back up to full speed.
I was asked to send the smart hub back as they said it was faulty, they then sent me a new one. Last week I plugged it in just to to see and guess what.....My speed dropped to 40Mbps right away. So I switched back to HH5 right away and that was fine and has been since.
I will not be using another Smart Hub.
 
Meddling-Monk said:
Grab a nice and cheap Broadcom VDSL2 modem like the TP Link W9970, it's fairly robust for a modem/bridge unit. I've had to switch over to this from a HH5a that refused to go anywhere near it's max speed, as well as the continuous disconnections from the HH5a phoning home all the time (every week). Causing further speed reductions from DLM kicking in and seeing it as a fault. Price shouldn't be that heavy, around £30 I think. But should do the job of improving on the HH series.
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Can this be configured in modem only mode then, say if I wanted to use USG with this as the modem only?
 
@nightmare99

I can't speak for all versions. But this specific version (the W9970, the one I'm using) can definitely be switched over to modem only mode and you connect a router/switch/access point to it and get the other features that way. The only thing with the TP Link W9970 however is that it doesn't have a full set of line stats easily available (like say the old BT White Box Modem). It only has the basics for the casual user. For more line stats you'll need to look around for the info and apply either an unofficial "patch" (added instructions) to it, or live with "most" details through a java app that can pull the relevant info most people will want without messing around with firmware etc.

Personally, I found the W9970 to be able to hold a terribly unstable line fairly well, and permitted DLM to see a stable line (by not having the HH phone home and DC you every week) to let DLM slowly increase speeds back up. Also allowed the cabinet to switch me down to 3dB slowly and increased speed to maximum (currently at 4dB for full 79999 download speed; could never get this with the HH5a).

There are two versions of the W9970 now, and I'm unsure which one is preferable, but I can tell you mine is the V2 version (second) if that helps.
 
See my edit. The section number describes VDSL bridge mode where you only configure the VLAN tag (101) on the device. I wish TP Link would make a wifi-less version of that box that didn't look like a doorbell.
 
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