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odd loss of 9mbit downstream rate
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- odd loss of 9mbit downstream rate
odd loss of 9mbit downstream rate
29-06-2015 1:18 PM
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Folks,
I'm at a loss to explain this. I need your help
I've been syncing at a downstream rate of 74-75mbit/s for over a year. (It only dropped below that when g.inp kicked in, but I switched to a 8800nl and all was well again.)
I have very low error rates. No errored seconds. A few hundred rs correctable errors per day.
A few days ago, I noticed my downstream snr had dropped from 6.4 to 4.6. I've never seen this behaviour before, so I rebooted the router.
Now, my downstream rate is always in the 66mbit/s ballpark. Still the same number of low errors. Still the same downstream snr of 6.4. Still the same downstream attenuation of 14.6. Same ping. Same interleaver depth of 8 and 1 with g.inp enabled.
I've turned the modem off for over 30 mins and disconnected it, but no change when I powered back on.
I'm at a loss to know why I've suddenly lost around 9mbit/s in downstream rate.
Any ideas?
Thanks!
-- gyre --
I'm at a loss to explain this. I need your help
I've been syncing at a downstream rate of 74-75mbit/s for over a year. (It only dropped below that when g.inp kicked in, but I switched to a 8800nl and all was well again.)
I have very low error rates. No errored seconds. A few hundred rs correctable errors per day.
A few days ago, I noticed my downstream snr had dropped from 6.4 to 4.6. I've never seen this behaviour before, so I rebooted the router.
Now, my downstream rate is always in the 66mbit/s ballpark. Still the same number of low errors. Still the same downstream snr of 6.4. Still the same downstream attenuation of 14.6. Same ping. Same interleaver depth of 8 and 1 with g.inp enabled.
I've turned the modem off for over 30 mins and disconnected it, but no change when I powered back on.
I'm at a loss to know why I've suddenly lost around 9mbit/s in downstream rate.
Any ideas?
Thanks!
-- gyre --
Message 1 of 8
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Re: odd loss of 9mbit downstream rate
29-06-2015 1:30 PM
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It is hard to pin down the exact reason, but it could be an increase of FTTC uptake on your cab, resulting in more users and thus more crosstalk. What modem are you using?
If G.INP has been applied to the downstream, then I wouldn't of thought interleaving would be applied as well (to the downstream), perhaps interleaving has been applied to the upstream, but the G.INP fix that has been rolled out, applies G.INP to the down and some error correction to the up (not interleaved), unless your upstream is unstable.
Some stats would be great, if you could post them.
If G.INP has been applied to the downstream, then I wouldn't of thought interleaving would be applied as well (to the downstream), perhaps interleaving has been applied to the upstream, but the G.INP fix that has been rolled out, applies G.INP to the down and some error correction to the up (not interleaved), unless your upstream is unstable.
Some stats would be great, if you could post them.
Message 2 of 8
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Re: odd loss of 9mbit downstream rate
29-06-2015 1:38 PM
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I'm using a Billion 8800NL. g.inp has been applied to the downstream. Stats included below.
I've been monitoring the router stats several times a day for the last few months. This wasn't a slow degradation. One minute I have 75mbit/s. I could reboot 5 times and I'd still have 75mbit/s as long as the DLM didn't kick in
However, after noticing the unusual 4.6 snr margin, I rebooted and have been stuck on 66mbit/s since.
-- gyre --
I've been monitoring the router stats several times a day for the last few months. This wasn't a slow degradation. One minute I have 75mbit/s. I could reboot 5 times and I'd still have 75mbit/s as long as the DLM didn't kick in
However, after noticing the unusual 4.6 snr margin, I rebooted and have been stuck on 66mbit/s since.
-- gyre --
Message 3 of 8
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Re: odd loss of 9mbit downstream rate
29-06-2015 2:56 PM
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Have you been re-sync'ing more than once?
DLM may of intervened if you have rebooted your CPE multiple times. Try to minimise reboots (none at all if you can resist), preferably early in the morning.
I would wait until DLM deems fit, and re-sync's, hopefully then you will gain your sync speed back.
If your speeds do not increase over time, I would try a new filter, if no increase, it will most likely be down to interference/crosstalk.
DLM may of intervened if you have rebooted your CPE multiple times. Try to minimise reboots (none at all if you can resist), preferably early in the morning.
I would wait until DLM deems fit, and re-sync's, hopefully then you will gain your sync speed back.
If your speeds do not increase over time, I would try a new filter, if no increase, it will most likely be down to interference/crosstalk.
Message 4 of 8
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Re: odd loss of 9mbit downstream rate
29-06-2015 6:11 PM
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Crosstalk so they say, I have had the same problem, Gone from 77.43Mb/s to 66Mb/s.... Funny how all of us with this problem have dropped down to the same Downstream.!!!!!!!!!!
Message 5 of 8
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Re: odd loss of 9mbit downstream rate
29-06-2015 7:39 PM
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Can I join the group, I had the G.inp ‘problem’ and changed to a Billion 8800NL and everything was fine, around 73 to 77 down for months, then last week around 8 in the morning a re-sync.
No reason just an out of the blue re-sync and speed dropped to 68 down (from the BT tester site) although the Billion still reports a download speed of 78584 but a connection max speed of 72399 ???.
I have some before and after stats if anyone would like them but they don't seem much help.
Regards P.
No reason just an out of the blue re-sync and speed dropped to 68 down (from the BT tester site) although the Billion still reports a download speed of 78584 but a connection max speed of 72399 ???.
I have some before and after stats if anyone would like them but they don't seem much help.
Regards P.
Message 6 of 8
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Re: odd loss of 9mbit downstream rate
30-06-2015 10:13 AM
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@gyre
I've run a few tests and I can't see any issues I'm afraid. As others have mentioned it could well be crosstalk that's caused this.
@Pendragon
I'm not sure why your getting results of 68mbps as your profile on ours and BT's end is set around 75mbps. Is this still ongoing?
I've run a few tests and I can't see any issues I'm afraid. As others have mentioned it could well be crosstalk that's caused this.
@Pendragon
I'm not sure why your getting results of 68mbps as your profile on ours and BT's end is set around 75mbps. Is this still ongoing?
Message 7 of 8
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Re: odd loss of 9mbit downstream rate
30-06-2015 10:50 AM
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Morning Matthew,
Just done a BT speed test and everything seems almost back to normal today (72.09 down and 16.09 up), it might have been nothing more than local congestion at our local cabinet.
The speed drop was right after the re-sync and we have had no others since then to put the speed back so it must have been local.
I might get a ‘crosstalk’ drop on Thursday as our new neighbours are having their phone connected and broadband as well, I would expect them to go for FTTC as they have two boys with Xboxes (that should screw our download speed ::)).
Just bad luck with the BT test is seems, so please ignore, regards Pendragon.
Just done a BT speed test and everything seems almost back to normal today (72.09 down and 16.09 up), it might have been nothing more than local congestion at our local cabinet.
The speed drop was right after the re-sync and we have had no others since then to put the speed back so it must have been local.
I might get a ‘crosstalk’ drop on Thursday as our new neighbours are having their phone connected and broadband as well, I would expect them to go for FTTC as they have two boys with Xboxes (that should screw our download speed ::)).
Just bad luck with the BT test is seems, so please ignore, regards Pendragon.
Message 8 of 8
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