Sync rate
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- Re: Sync rate
Sync rate
25-06-2018 6:48 PM - edited 25-06-2018 6:49 PM
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Hi There,
I was wondering if you could assist with a drop in sync rate over the month of may.
My router was syncing at approx. 62mbit and has dropped over the month of may to what it now currently is 55-56mbit, sometimes 54mbit.
I notice on the openreach speed estimate that 55mbit is the limit on the low bracket of a clean line.
I have tried resetting the router, a different modem line cable, twisted pair versus supplied which actually makes things a fraction worse.
The reason I ask is that there has been a fair amount of construction next to the cabinet I connect to and cable laying which I suspect may be responsible for the sudden drop in speed.
Re: Sync rate
26-06-2018 9:34 AM
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Sorry to hear your sync speeds have dropped.
I'm afraid our tests aren't showing any cause for this and as the sync speeds are within the estimates we'd struggle to progress this as a fault.
It may be down to crosstalk which is interference from other lines on FTTC and that can drop your sync speed gradually over time.
Re: Sync rate
26-06-2018 12:44 PM - edited 26-06-2018 12:46 PM
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Re: Sync rate
26-06-2018 1:46 PM
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I wouldn't recommend swapping the cable as if a engineer were to go out they will test another cable and you could end up with a £65 charge due to faulty internal wiring.
We can progress this to a engineer visit but if they can't find any faults the same charge above would still apply
Re: Sync rate
26-06-2018 5:27 PM
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Hi Matthew,
I appreciate your candidness. I suppose I will sit on it for now and see if it gets worse still. It's a shame because through no fault of my own I'm paying the same amount for less. That's an odd scenario.
I realise you get cross talk and it could well be that it just seems odd it has suddenly presented itself over a one month period and I've lived here for 7 years with pretty stable speed throughout.
If an engineer is just going to get a TDM out and say... yeah it's a poor line but that's not a fault then I'm back where I started with a £65 bill. Any way to check my line length from the cabinet without a TDM?
Re: Sync rate
27-06-2018 9:26 AM
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Hi @Aurhinius,
I've taken a look into this today and from our testing we can see that the estimated line length from the cabinet to your property is 503 Metres.
Re: Sync rate
27-06-2018 5:59 PM
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Thanks for this so a line length of 503m and my router is providing a line attenuation of 16.8 which seems way too high for that line length or is it just miss reporting for VDSL 2?
If this is down to crosstalk is vectoring an option?
Re: Sync rate
27-06-2018 6:56 PM
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Re: Sync rate
27-06-2018 7:59 PM - edited 27-06-2018 8:07 PM
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Unfortunately I don't have a hard wired phone so can't test with the quiet line I just have a dect model.
Run out of idea's as to what might have caused the sync rate drop then if it's not crosstalk. No internal cabling changes.
Router is showing -
6. Data rate: | 19999 / 55953 |
7. Maximum data rate: | 20203 / 55973 |
8. Noise margin: | 6.0 / 6.0 |
9. Line attenuation: | 17.3 / 16.8 |
10. Signal attenuation: | 17.2 / 16.8 |
Re: Sync rate
27-06-2018 8:44 PM
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Dect phones can interfere with the router, is it close?
Are you able to move it further away?
Re: Sync rate
28-06-2018 9:41 AM - edited 28-06-2018 9:42 AM
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Hi there.
If it helps here are the stats we can see from our side:
Test Outcome | Pass |
Test Outcome Code | GTC_FTTC_SERVICE_0000 |
Description | GEA service test completed and no fault found . |
Main Fault Location | OK |
Sync Status | In Sync |
Downstream Speed | 56.0 Mbps |
Upstream Speed | 20.0 Mbps |
Appointment Required | N |
Fault Report Advised | N |
NTE Power Status | PowerOn |
Voice Line Test Result | Pass |
Bridge Tap | Not Detected |
Radio Frequency Ingress | Not Detected |
Repetitive Electrical Impulse Noise | Not Detected |
Cross Talk | Not Detected |
Estimated Line Length In Metres | 503.0 |
Upstream Rate Assessment | Very Good |
Downstream Rate Assessment | Reasonable |
Interference Pattern | Regular Interference Observed on Week Days |
Service Impact | Retrains Observed |
Interference Duration Longest Occurrence | From 17:00 to 17:15 |
Interference Location | Unknown |
Home Wiring Problem | Not Detected |
Downstream Policing Discard Rate | 0.0 |
Customer Traffic Level | Upstream and Downstream Traffic Detected |
Technology | VDSL |
Profile Name | 0.128M-80M Downstream, Error Protection Off - 0.128M-20M Upstream, Error Protection Off |
Time Stamp | 2018-06-15T09:45:00 |
Parameters | MIN | MAX | AVG |
Down Stream Line Rate | 53.9 Mbps | 56.5 Mbps | 55.8 Mbps |
Up Stream Line Rate | 20.0 Mbps | 20.0 Mbps | 20.0 Mbps |
Up Time | 580.0 Sec | 900.0 Sec | 898.9 Sec |
Retrains | 0.0 | 2.0 | 0.0 |
Current and Last 15 Minute Bin Performance | ||
Parameters | Last Traffic Count(Upto 15 mins) | Current Traffic Count(Upto 15 mins) |
Start Time Stamp | 2018-06-28T09:18:43.351+01:00 | 2018-06-28T09:33:43.351+01:00 |
Ingress Code Violation | 0 | 1 |
Egress Code Violation | 0 | 0 |
Errored Seconds | 4 | 1 |
Severely Errored Seconds | 0 | 0 |
Unavailable Seconds | 0 | 0 |
Even though you don't have a wired phone handset it may still be worth doing the quiet line test to check for any noise on your line.
Re: Sync rate
28-06-2018 5:12 PM
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thanks for the stats always very interested to see stuff like this.
I suppose it is what it is. Did the quiet line test and I hear some very quiet hiss which seems all very normal to me.
regular interference on weekday is intriguing how does it calculate that and ultimately is that even an issue that is fixable?
I suppose the question is where do we go with this? If it's not crosstalk at the cab but there is a approx. 7mbit sync loss which puts it still above the hand back limit all be it at the bottom of the low performance bracket.
It seems like we are where we are territory and there's not much anyone can do?
Re: Sync rate
28-06-2018 5:19 PM
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Yeah it looks like your line is performing as best as it can as your sync rate is within expectations/estimates and there aren't any signs of a fault on our tests.
The possible regular interference detected unfortunately isn't something we can solely base a fault report on.
We can push for an engineer visit but if an engineer goes out and finds no fault then we'd likely pass on to you £65 of the call-out charge.
Re: Sync rate
28-06-2018 6:17 PM
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As I don't want to end up with a £65 bill at the moment I think I will just live with it and see if it gets any worse. Everyone has been extremely helpful and obliging so I highly rate your support.
Thank you.
Re: Sync rate
28-06-2018 7:22 PM
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