Kitz Forum
Broadband Related => FTTC and FTTP Issues => Topic started by: Lostinthewoods on February 24, 2021, 11:00:07 AM
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Hey guys
Long story short I went FTTC when my cab went live and was happily getting around 70-76Mb/s. Gradually this has gone down over time and since January I've been capped at 40Mb/s every resync. Called EE and I've had 2 Openreach visits and the summary is EE are now not able to offer me anything above their 40Mb/s package.
This is despite me being able to get it previously and my neighbour (I know there may be other things affecting this) being able to order 60-80Mb with Zen.
I just don't get it. Something must have changed somewhere, no?
Is there anything I can do?
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Sounds like increasing crosstalk as more and more neighbours have connected to FTTC, no? In that case, nothing can be done apart from, going to FTTP if available or going to bonded dual links (double speed) as I do. I have four very slow ADSL links bonded together.
See if you can find out about FTTP availability. Infinitely more reliable as well as faster.
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Yeah that's what I thought but I don't get how my neighbour gets offered such vastly increased speed than me? This is true for several of the houses in our close.
The BTw checker also lists higher speeds than EE have said they can offer me
We have no FTTP available, although CityFibre have started building the other end of our city so may be available in the next 4-5 years...!
Who do you get your bonded supply through?
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It would be rather unusual for crosstalk to lower the speed that much. Are you able to provide any stats from your connection? Also, can you check your expected speed with the BT Wholesale Broadband Availability Checker (https://www.broadbandchecker.btwholesale.com/) and copy the result here (with personal information removed).
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Sure -
Up/Down
Data Rate: 16.20Mbs/49.89Mbs
Max Data Rate: 16.2Mbs/50.39Mbs
Noise Margin: 6.1/4.1
Line attenuation: 25.2/18.5
Signal attenuation: 25.1/18.5
I'm currently syncing at a higher rate than the maximum EE says my line can get
BTw checker:
Featured Products Downstream Line Rate(Mbps) Upstream Line Rate (Mbps) Downstream Handback
Threshold(Mbps) WBC FTTC Availability Date WBC SOGEA Availability Date Left in Jumper
High Low High Low
VDSL Range A (Clean) 71.1 49 19 12.5 43 Available Available --
VDSL Range B (Impacted) 69.4 44.5 18.7 11.3 35 Available Available --
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Those figures don't give much encouragement unfortunately. Have you checked your own home wiring for anything which could degrade the signal? If it's possible for you to do, plugging the modem into the test socket (inside the master socket) would eliminate the home wiring from the connection. (Sorry if I'm telling you things you already know).
If that doesn't help, then hopefully someone else will have some ideas.
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I'll have to have a hunt around for a filter to use the test socket - I've got a splitter faceplate so use an RJ11 cable to the socket
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You were getting circa 70Mbps you say, and your connections now show circa 50Mbps - I lost about 18Mbps to cross-talk on my own line.
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I lost 13Mbit since being on Openreach, or 33Mbit if you count from when I had Digital Region.
If you include the attainable rate I had on Openreach then I'm about 53Mbit below what I had when nobody else was using the cabinet.
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You were getting circa 70Mbps you say, and your connections now show circa 50Mbps - I lost about 18Mbps to cross-talk on my own line.
Do you mean from internal phone lines etc?
I have no phones plugged in anywhere in my house
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Cross-talk, is basically interference from other circuits that are in the same distribution cable as you, from the green street cabinets through to where your own circuit 'drops off' to your house.
If you were customer 1 to go 'live' on FTTC broadband, then you would not suffer CT, as soon as customer 2 goes 'live', CT is introduced. It all depends on where in the distribution cable your circuit lies, and how many other circuits around you are also on FTTC, as to how much CT will affect your circuits performance.
There are other factors too, but to keep it in laymans terms, there's nothing you can do about it I'm afraid - it is what it is.
The only thing you can affect change on and maximise your speed/stability etc ... is the internal wiring set up within your premises. Too deep to go into as I simply haven't time to explain, but there's loads of people on here that can help, and/or start searching for ... 'star-wiring effects on broadband' ... 'bridged tap effects on broadband' ... got to go, but I'm sure someone will find the Kitz link that will assist you ??
Cheers.
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That reduction is on the high end but it does happen, BT's VDSL trials showed up to 40% loss in sync speed for unlucky lines, my own line has dropped from circa 110 attainable to as low as mid 60s in the past (it even got to as low as 50 but that was accepted as a fault so not counted), currently at mid to high 70s.
I am one of the lucky one's, others on my pole have speeds in the 50s. I am almost 30mbit above my handback threshold, which shows how powerful crosstalk can get.
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In a weird twist my sync speed has been climbing. Currently on 53.01Mb/s.
Could this be due to some reset the engineer did when he replaced some cabling?
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In a weird twist my sync speed has been climbing. Currently on 53.01Mb/s.
Could this be due to some reset the engineer did when he replaced some cabling?
Difficult to say without sight of the full statistics both pre- and post- cabling replacement.
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Stats now are:
Up/Down
Data Rate: 16.08Mbs/53.01Mbs
Max Data Rate: 16.90Mbs/54.23Mbs
Noise Margin: 6.2/3.8
Line attenuation: 25.3/18.5
Signal attenuation: 25.2/18.5
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So it looks as if the DLM process has lowered the DS target SNRM to 4 dB.
If the circuit remains stable, the DLM process may make one final reduction of the DS target SNRM to 3 dB . . . with a resulting increase in the DS synchronisation and throughput speeds.
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Fingers crossed! I’ll keep an eye on it the next day or two
Thanks!
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Sorry to drag up an old thread here but my line is getting worse and worse.
It dropped overnight on Sunday from around 55Mb to 18Mb. EE sent one of their guys round (who didn't do much), Openreach came the day after and did some line tests. With the EE box, there were faults. Without it there were none. So EE sent me a new box.
That came today but my speeds have not changed. I also have no dial tone on the line (tested on the test socket as well as the faceplate socket)
I just randomly went to check the BTw checker and the speeds on there have drastically changed...
Back in Feb it was this:
Featured Products Downstream Line Rate(Mbps) Upstream Line Rate (Mbps) Downstream Handback
Threshold(Mbps) WBC FTTC Availability Date WBC SOGEA Availability Date Left in Jumper
High Low High Low
VDSL Range A (Clean) 71.1 49 19 12.5 43 Available Available --
VDSL Range B (Impacted) 69.4 44.5 18.7 11.3 35 Available Available --
And now it's this:
Featured Products Downstream Line Rate(Mbps) Upstream Line Rate (Mbps) Downstream Handback
Threshold(Mbps) WBC FTTC Availability Date WBC SOGEA Availability Date Left in Jumper
High Low High Low
VDSL Range A (Clean) 50.5 35 9.5 6.6 30 Available Available --
VDSL Range B (Impacted) 49.2 32.4 9.4 6.2 25 Available Available --
What could have caused such a drop in these speeds??
My neighbour's hasn't budged at all.
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I also have no dial tone on the line (tested on the test socket as well as the faceplate socket)
Assuming you expect the telephony service to be working, i.e. to receive a dial tone, then there is a line fault. In Openreach-speak, you have a "one leg dis". A broadband service will continue to operate, with severely degraded speed, with one wire of the pair disconnected.
Just report a telephony fault to whoever provides your service (don't mention anything related to your broadband service). Once the pair is remade whole, your broadband service will recover.
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I still marvel at the concept that a single wire can somehow still work at all. Is this due to it effectively acting like a radio signal in that scenario?
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Had so many issues this year... I cannot wait for FTTP to arrive!
OR engineer is here now
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I still marvel at the concept that a single wire can somehow still work at all. Is this due to it effectively acting like a radio signal in that scenario?
xDSL technology is just usage of two extremely low power radio-frequency transceivers (the xTU-C and xTU-R) linked together by a transmission line (the telephony twisted pair). Sever one leg of that radio-frequency transmission line and there is a good chance that the circuit will continue to operate but with severely degraded performance.
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Agrees with Alex, it does seem miraculous. Think of a slinky (https://en.wikipedia.org/wiki/Slinky), if you can remember those wire helix toys from the 1970s. Or think of compression of air in acoustics. Temporarily, you can get away without having a current return path because there is charge storage available provided by capacitance. You just cannot transmit dc of course, but you can transmit high frequencies.