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Slow uplink speed

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Community Team

Hi Robot5

 

We would now need to arrange a BT Openreach engineer visit if the connection is still dropping.

 

Would you like me to arrange this visit?

 

Thanks

 

Debbie

Highlighted
Robot5
Wizz Kid

Hi Debbie

I think my last post said " The SM are sending a BT Openreach engineer tomorrow"

 

but I would like an answer to the stats issue in the router logs please could you explain ?

 

others may be interested.

 

many thanks

 

Community Team

Hi Robot5

 

These are errors on the line, not router errors.

 

There are a really high number of errors showing on the line at the moment. Please let us know how you get on following the engineer visit.

 

Thanks

 

Debbie

Robot5
Wizz Kid

Hi Debbie

Ok, thank you for your reply.

If there are errors on the line, why do these not show as errors on the router stats, the router is on the internet via the line ?

Are you saying that the router only records errors when they are on the back haul network i.e. to a website, and not on your actual line ?

Surely the router is connected to the DSLAM and it is this section that it is monitoring  or is it something else please ?

I would like to understand this point.

Many thanks

Robot5
Wizz Kid

Hi Debbie

Good to know you are seeing the errors, I have to type this lots of times to get a message through. I hope they stay that way until the BT Openreach comes tomorrow, and that he does not 'knock off' the fault when he is testing , like before !

Many thanks

Community Team

Hi Robot5,

 

The line history is certainly showing very high errored seconds every hour from around 3:30am today. To be honest I don't know why the errors aren't shown in the router logs, could you post a screen shot of the logs please (please make sure that you to post any personal information)


Chris

Robot5
Wizz Kid

Hi Chris Internet router stas below.

Interface Received Sent  Byte Packet Error Discarded Byte Packet Error Discarded
Other_R_0_65000011922300
INTERNET_TR069_R_0_38221573939205109003010151118932000
Robot5
Wizz Kid

Hi Chris

Could it be you are seeing the physical layer and the HG633 router is showing the Network layer to me.

You would think that line errors would also cause network errors, but maybe the Network Layer corrects them or just asks for a repeat, so the only result is that it is very slow data rate ?

Or something else ?

Many thanks

Community Team

Hi Robot5,

 

DLM changed your profile in the early hours of this morning which has resulted in the error count dropping to zero since then

 

Our line history show errored seconds per hour, these are seconds containing at least one CRC error, they can affect speed performance as they require retransmission of data

 

I'll try to find out a bit more information about the errors in the router logs.

 

Chris

Robot5
Wizz Kid

Hi Chris

Many thanks for your reply.

It seems to me that the DLM is reducing the SNR ( by inserting extra line loss) to force an error free line to give the customer some kind of service, but at a lower speed. However when it does this on my line it reduces the speed to such a low amount ( I normally get only 2.5Mbps DOWNlink nowadays, but 5 years ago it was 3.2Mbps ) at around 1.5Mbps that it causes problems in using the service, even for e-mails.

So much stuff is running in the background nowadays (marketing tools for talktalk and google etc) that it takes forever to do anything.

i would appreciate more info on the router logs as I cannot see how I can see the line errors at all.

Many thanks

 

 

Community Team

Hi Robot5,

 

I've asked our product team why there's a difference between the errors showing in the router logs and the errors we can see on our systems. I'll let you know when I have any more information

 

Is your router still connected to the test socket at the moment?


Chris

Robot5
Wizz Kid

Hi Chris

Thank you for your reply.

My router is connected to my test socket at present, confirmed.

Are there line errors now Chris please ?

System Up Time 00:25:03

Port

Status

TxPkts

RxPkts

Collisions

Tx B/s

Rx B/s

Up Time

WAN

PPPoA

8045

10068

0

809

7826

00:23:12

LAN1

Link down

--

--

--

--

--

--

LAN2

Link down

LAN3

Link down

LAN4

Link down

WLAN

54M

42170

46222

0

14769

5479

00:24:23

 

 

ADSL Link

Downstream

Upstream

Link Rate

3517 Kbps

583 Kbps

Line Attenuation

54.5 dB

34.6 dB

Noise Margin

6.1 dB

7.2 dB

 

 

 

Above are my router stats (netgear router) from 2013 proof of much better speed from TT. Note the line loss is the same as today, so why is the speed so poor ?

Can you confirm that VDSL2 does not use the same band as ADSL ?

Perhaps this could be crosstalk from VDSL2 systems being installed in the last 5 years ?

Many thanks

 

 

 

 

Community Team

Looks as though DLM was optimised earlier today. Sync speed is now 2.5Mbps. There was one hour earlier this morning when the errors spiked again then couple of hours following the profile change that showed no connection data but multiple reconnections. The latest information that we have is from a couple of hours ago,

 

All I can say regarding potential cross talk is the line tests aren't picking up any issues

 

Chris

Robot5
Wizz Kid

Hi Chris

here is the latest router stats

DSL synchronization status:

Up

Connection status:

Showtime

Upstream line rate (kbit/s):

707

Downstream line rate (kbit/s):

2252

Maximum upstream rate (kbit/s):

692

Maximum downstream rate (kbit/s):

2884

Upstream noise safety coefficient (dB):

5.2

Downstream noise safety coefficient (dB):

6.8

Upstream interleave depth:

4

Downstream interleave depth:

96

Line standard:

ADSL_G.dmt.bis

Upstream line attenuation (dB):

44.6

Downstream line attenuation (dB):

54.8

Upstream output power (dBm):

12.6

Downstream output power (dBm):

17.4

Channel type:

Interleaved

 

15_5-2019 12:15

 

The line went down again at 11:00, the BT eng had gone by then.

 

What do you think caused this please ?

 

And it is connected at 2.2Mbps, not 2.5Mbps now.

 

Also notice how the line loss has now increased to 44dB in the UPlink direction ??

What is causing that please ?

 

Are you sure that a line test will actually measure crosstalk ?

I don't think it will not show up on DC tests Chris.

 

It would only show on noise if the tester actually measured in the ADSL Downlink band.

 

Is it possible to check if the VDSL2's being installed have notching below 2.2MHz t.e. they will not transmit in the ADSL bands.

 

Many thanks

 

Community Team

Hi Robot5,

 

I ran a line test which completed at 11:09,  this will have caused a disconnection

 

Line history shows that the upstream attenuation has been 42db then 44db since Monday night. It did appear to drop to 37db earlier this morning but has gone back to 44db - I don't know why it has varied.

 

"Is it possible to check if the VDSL2's being installed have notching below 2.2MHz t.e. they will not transmit in the ADSL bands."

 

Sorry, I have no way of checking this.

 

Chris

Robot5
Wizz Kid

Hi Chris

 

Thank you for your reply.

 

Is there any more line testing going on today or tomorrow please ?

 

What do you think might have caused the large drop in speed since 2013 then ?

 

Does the DLM change the line loss (UP or DOWN) as part of the DLM optimisation program i.e. to force the SNR down and thus to lower the speed for a more stable service ?

 

Many thanks

 

Community Team

Sorry, I don't know about the line testing, it's possible that our network team may run further tests following the engineer visit.

 

"What do you think might have caused the large drop in speed since 2013 then ?"

 

We were on a different DLM system back in 2013 which may account for some difference, but lines deteriorate over time which can cause an increase in noise which can affect speed

 

DLM changes the target SNR to adjust speed (it can't change line attenuation)

 

Chris

Robot5
Wizz Kid

Hi Chris

Thank you for your e-mail reply.

 

My line went down again this morning at 04:45 approx. and the Downlink speed is lower again now 2Mbps.

 

Can you see any line errors please ?

 

Many thanks

Community Team

DLM changed your profile, this will be the cause of the drop in connection and drop in speed.

 

The error count has been zero or low single figures every hour since around 7am yesterday, I think DLM has dropped the speed because there was a number of resyncs yesterday morning. The connection appears to have been OK since so DLM should move you to a faster profile if the connection remains stable (and error count remains low)


Chris

Robot5
Wizz Kid

Hi Chris

Many thanks for your reply and explanation.

I will check again in 24hrs and see if the speed rises.

 

Many thanks