Slight Loss Of Speed

quandam · Mar 16, 2009, 10:06:23

It's three days now since I got the 2700 up and running and have noticed a loss in speed. On my old Netgear I was getting beween 6.7mb and 7+ virtually all day long, I am now getting around 6mb ish with the 2700.

Could this be down to the numerous times I had disconnected the ADSL line over several days during my marathon set up fiasco and the line is monitoring and will eventually return to the higher speeds?

Any thoughts would be welcome

Rik · Mar 16, 2009, 10:15:31

It could be down to the disconnections. Go to:

http://192.168.1.254/xslt?PAGE=J03&THISPAGE=A02_POST&NEXTPAGE=J03

and let me know what figures you have for downstream attenuation, noise margin and sync speed would you.

Simon · Mar 16, 2009, 10:16:23

I believe it can take up to 5 days for things to level out, after a period of disruption, but someone more qualified will be along to confirm that.

quandam · Mar 16, 2009, 10:18:35

Quote from: Rik on Mar 16, 2009, 10:15:31
It could be down to the disconnections. Go to:

http://192.168.1.254/xslt?PAGE=J03&THISPAGE=A02_POST&NEXTPAGE=J03

and let me know what figures you have for downstream attenuation, noise margin and sync speed would you.

Rik

The link is not connecting. (404 error)

Rik · Mar 16, 2009, 10:20:48

Possibly a difference in firmware. Try:

http://192.168.1.254/xslt

then Broadband link > Details.

quandam · Mar 16, 2009, 10:34:47

Quote from: Rik on Mar 16, 2009, 10:20:48
Possibly a difference in firmware. Try:

http://192.168.1.254/xslt

then Broadband link > Details.

Rik

Downstream attenuation= 14.6

Noise Margin= 16db

Couldn't find sync speed, sorry!

Rik · Mar 16, 2009, 10:38:02

Run a BT speed test if you will, Q, that will give us the rest of the picture. With that attenuation, I'd expect you to sync at 8128, so I'm suspicious your profile may have dropped.

quandam · Mar 16, 2009, 10:45:54

Quote from: Rik on Mar 16, 2009, 10:38:02
Run a BT speed test if you will, Q, that will give us the rest of the picture. With that attenuation, I'd expect you to sync at 8128, so I'm suspicious your profile may have dropped.

Here it is Rik

Results Image not loaded

Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 7616 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 6500 kbps
Actual IP throughput achieved during the test was - 6008 kbps

If you wish to discuss these results please contact your ISP.

If you are experiencing problems with specific applications, servers or websites please contact your ISP for assistance.

Your test has completed please close this window to exit the performance tester.

Rik · Mar 16, 2009, 10:48:25

That's a perfect test for your sync speed, Q. You've got interleaving turned on, which is dropping your max sync speed to 7616. It might be worth having a word with support and asking for it to be turned off.

quandam · Mar 16, 2009, 10:51:39

Quote from: Rik on Mar 16, 2009, 10:48:25
That's a perfect test for your sync speed, Q. You've got interleaving turned on, which is dropping your max sync speed to 7616. It might be worth having a word with support and asking for it to be turned off.

Thanks Rik. I will give them a call

quandam · Mar 16, 2009, 11:02:27

Quote from: Rik on Mar 16, 2009, 10:48:25
That's a perfect test for your sync speed, Q. You've got interleaving turned on, which is dropping your max sync speed to 7616. It might be worth having a word with support and asking for it to be turned off.

Rik

Rang CS, answered , wait for it, without a ring in about 10 seconds. Request sent to BT should be active from tomorrow. How does interleaving 'off' make a difference? (keep it simple

)

Thanks for the advice

Rik · Mar 16, 2009, 11:06:23

Interleaving is used when a line is thought to be error prone. Instead of sending data as a consecutive stream of packets, it re-arranges the packets so that they are sent 'out of order' and need to be re-assembled when they arrive. The idea is that one bad packet will require less re-transmission than if they were in normal sequential order. However, there is a processing 'cost' in interleaving which reduces the maximum sync speed. It also increases latency, by the order of 20ms according to accepted theory, though I have an interleaved line and can ping at 19-26ms, so I'm not totally convinced of that.

Steve · Mar 16, 2009, 12:24:40

Interleave appeared on my line during my brief foray (lack of UPnP) with the BT2700 HGV. It has now been removed and has not since been reintroduced.

I wonder how many users of the 2700HGV on the forum are interleaved?

Perhaps an unfair question in some ways as some are used on long lines when interleave may have a positive benefit. I am obviously more interested in responses from users with high downstream sync rates.

Rik · Mar 16, 2009, 12:35:08

I am.

quandam · Mar 16, 2009, 12:36:26

Quote from: stevethegas on Mar 16, 2009, 12:24:40
Interleave appeared on my line during my brief foray (lack of UPnP) with the BT2700 HGV. It has now been removed and has not since been reintroduced.

I wonder how many users of the 2700HGV on the forum are interleaved?

Perhaps an unfair question in some ways as some are used on long lines when interleave may have a positive benefit. I am obviously more interested in responses from users with high downstream sync rates.

Steve

I am approx 400 meters from the exchange with a steady connection so am hoping turning interleaving off will bring me back up to the higher speed

Steve · Mar 16, 2009, 12:43:06

In practical purposes I think the only thing you'll notice Q is the reduction in latency with interleave off. The difference in performance between a profile of 6500 and 7150 is at best marginal, only shown in speedtest results and not in overall download performance.

Rik · Mar 16, 2009, 12:44:18

You may be interested in a fuller explanation of interleaving, Q:

http://www.kitz.co.uk/adsl/interleaving.htm

quandam · Mar 16, 2009, 14:33:59

Quote from: Rik on Mar 16, 2009, 12:44:18
You may be interested in a fuller explanation of interleaving, Q:

http://www.kitz.co.uk/adsl/interleaving.htm

Thanks Rik

Den · Mar 16, 2009, 17:13:02

My profile for down load is 7616kbs with interleaving on, are we saying that if Idnet turn interleaving off I can go even faster. My 2700HGV has held the line for a couple of months now.

Lance · Mar 16, 2009, 17:17:39

Depending on your remaining noise margin, you might be able to go up to 8128!

Rik · Mar 16, 2009, 17:48:08

Which would give you a profile of 7150 rather than 6500, Den.

Steve · Mar 16, 2009, 18:28:45

Quote from: Den on Mar 16, 2009, 17:13:02
My profile for down load is 7616kbs with interleaving on, are we saying that if Idnet turn interleaving off I can go even faster. My 2700HGV has held the line for a couple of months now.

Another member with a potential full sync on the 2 wire with interleave on. Perhaps just coincidence.

quandam · Mar 17, 2009, 10:13:45

Quote from: stevethegas on Mar 16, 2009, 12:43:06
In practical purposes I think the only thing you'll notice Q is the reduction in latency with interleave off. The difference in performance between a profile of 6500 and 7150 is at best marginal, only shown in speedtest results and not in overall download performance.

Steve

It appears that BT have switched off interleaving and as you say I am still getting the slower speed reading (still good though!) as reported yesterday BUT everything is running much quicker and sharper and the ping reading has virtually halved. So, I think it is definitely a matter of leaving things well alone, as Shakespeare said

"If it ain't broke don't fix it!"
Thanks all for the advice.

Rik · Mar 17, 2009, 10:20:43

Shakespeare was a wise old bard.

Rik · Mar 17, 2009, 10:22:44

Afterthought, Q. You'll need to force a re-sync to go back to 8128...

quandam · Mar 17, 2009, 10:27:35

Quote from: Rik on Mar 17, 2009, 10:22:44
Afterthought, Q. You'll need to force a re-sync to go back to 8128...

Rik

Have done a BT test this morning and it says that I am back to 8128. Do you think I need to re-sync?

Rik · Mar 17, 2009, 10:28:17

Not if BT report 8182. What was the profile?

quandam · Mar 17, 2009, 10:31:33

Quote from: Rik on Mar 17, 2009, 10:28:17
Not if BT report 8182. What was the profile?

Profile 6500.

Rik · Mar 17, 2009, 10:33:05

That should recover to 7150 in the next few days.

quandam · Mar 17, 2009, 10:34:25

Quote from: Rik on Mar 17, 2009, 10:33:05
That should recover to 7150 in the next few days.

OK Rik, will remember what Shakespeare said and leave things well alone, thanks.

David · Mar 17, 2009, 10:39:33

That Shakespere was just Avon you on I think

sorry Q

Rik · Mar 17, 2009, 10:46:24

David · Mar 17, 2009, 10:51:42

Sticking to topic Rik any thoughts on these figures,
   24/02/09 12:26 5182.82 Kbps    378.40 Kbps
   20/02/09 11:17    5653.13 Kbps    378.05 Kbps
   19/02/09 23:02    5453.33 Kbps    378.52 Kbps
   19/02/09 19:59    5374.55 Kbps    378.36 Kbps
   18/02/09 12:03    5642.39 Kbps    378.46 Kbps
   17/02/09 20:36    5796.99 Kbps    377.94 Kbps
   17/02/09 14:28    6075.38 Kbps    378.19 Kbps
   17/02/09 10:50    5199.60 Kbps    378.49 Kbps

Now

   17/03/09 10:45    4730.49 Kbps    377.90 Kbps
   15/03/09 14:39    4731.71 Kbps    377.90 Kbps
   14/03/09 13:36    4706.19 Kbps    377.88 Kbps
   12/03/09 09:47    4733.53 Kbps    377.94 Kbps
   11/03/09 10:25    4728.78 Kbps    378.22 Kbps
   10/03/09 18:37    4694.89 Kbps    378.48 Kbps
   10/03/09 09:51    4692.50 Kbps    378.40 Kbps
   09/03/09 21:19    4544.08 Kbps    377.38 Kbps
   08/03/09 20:37    4753.95 Kbps    379.06 Kbps

Cant seem to get back to the optimum cant think why ?

Edit: IP address removed

Rik · Mar 17, 2009, 10:55:50

I've removed the file, David, as it quoted your IP address.

There's not a lot I can say, in isolation, as the figures alone show your line is slower, but not why. To be able to help, I need to know your sync speed, noise margin and attenuation 'before and after'. Ideally, I also need to know your profile. Try a BT test, that will tell us a bit more about now.

David · Mar 17, 2009, 10:58:22

Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 6112 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5000 kbps
Actual IP throughput achieved during the test was - 4690 kbps

sunday 8th March

Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 6112 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5000 kbps
Actual IP throughput achieved during the test was - 4435 kbps

Monday

Tuesday
Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 6112 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5000 kbps
Actual IP throughput achieved during the test was - 4613 kbp

13h march

est1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 6112 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5000 kbps
Actual IP throughput achieved during the test was - 4677 kbps

16th march

Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 6112 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5000 kbps
Actual IP throughput achieved during the test was - 4365 kbps

17th March

Test1 comprises of Best Effort Test: -provides background information.
Your DSL connection rate: 6112 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5000 kbps
Actual IP throughput achieved during the test was - 4636 kbps

Rik · Mar 17, 2009, 11:00:56

Well, the sync speed and profile are correctly related, so I can only assume that your sync speed has dropped between February and March. Do you know if either your noise margin or attenuation have increased?

David · Mar 17, 2009, 11:02:07

No Rik,would a ping test show this ?

Rik · Mar 17, 2009, 11:03:28

No, your router will though - at least it will give the current figures.

David · Mar 17, 2009, 11:04:44

OK

David · Mar 17, 2009, 11:16:11

David · Mar 26, 2009, 21:29:43

Your DSL connection rate: 6528 kbps(DOWN-STREAM), 448 kbps(UP-STREAM)
IP profile for your line is - 5500 kbps
Actual IP throughput achieved during the test was - 5137 kbps

Picking up again

Sebby · Mar 26, 2009, 23:17:58

The noise is easing, it would seem.

Rik · Mar 27, 2009, 09:05:20

What's you noise margin, David?

David · Mar 27, 2009, 10:06:11

I cen never get onto my routers log in Rik

David · Mar 27, 2009, 10:20:16

roadband Link – Statistics
   ATM Statistics
   IP Statistics
DSL       Down       Up
Current Rate:       6528 kbs       448 kbs
Max Rate:       7088 kbs       1072 kbs
Current Connection:
   Current Noise Margin:       8.0 dB       25.0 dB
   Current Attenuation:       42.7 dB       22.5 dB
   Current Output Power:       19.6 dBm       12.1 dBm
ATM       Cells       Errors       %
Transmit:       10333406       0       0
Receive:       79833384       0       0
IP       Bytes       Packets       Errors       %
Transmit:       380315470       2376629       0       0
Receive:       3714669370       3474123       0       0

Oh yes I can

Rik · Mar 27, 2009, 11:06:08

You're on a 9db target or more, so if you can maintain stability, things will pick up by 5-700kbps.

David · Mar 27, 2009, 11:13:49

Stability in this case is out of my control though ? so its

isnt it ?

Rik · Mar 27, 2009, 11:14:22

It is.

David · Mar 27, 2009, 11:17:40

Sebby · Mar 27, 2009, 12:50:46

Quote from: badpianoplayer on Mar 27, 2009, 11:13:49
Stability in this case is out of my control though ? so its isnt it ?

Just stop moving about so much.

David · Mar 27, 2009, 12:53:01

Or take more water with it

Im waiting with great anticipation for the new service as my exchange is enabled now and has been for about a month or more

quandam · Apr 02, 2009, 09:59:21

Quote from: Rik on Mar 17, 2009, 10:33:05
That should recover to 7150 in the next few days.

Rik

You were right, now back to 7150, speeds between 6.6Mb and 7+Mb virtually all day long. Everything running well with the 2700

Very happy!

Rik · Apr 02, 2009, 10:00:37

I'm pleased to hear it, Q, enjoy!

quandam · Apr 11, 2009, 17:54:28

Hi! Chaps & Chapess's

The 2700 is working fine, in use it is zipping along nicely and very enjoyable. If I do a speed test (on several) the readings are the worst I have had for a long, long time down to around 1.5Mb for most of the day. Is there any reason for this? As I say, in use, things tick over with apparent ease but it is odd that the speed test readings are very low (for me). Any ideas?

Sebby · Apr 11, 2009, 17:57:08

Probably exchange congestion. Which speed tester are you using? It's worth using BT's to see if the results are the same. If they are, you might want to let IDNet know and see if there's anything they can do.

Rik · Apr 11, 2009, 18:03:45

It would be helpful to have your router's stats too, Q.

quandam · Apr 11, 2009, 18:11:20

Quote from: Sebby on Apr 11, 2009, 17:57:08
Probably exchange congestion. Which speed tester are you using? It's worth using BT's to see if the results are the same. If they are, you might want to let IDNet know and see if there's anything they can do.

Sebby, I think you may well be right re exchange congestion. It has only arisen since the schools went on Easter break a few days ago and the little darlings are giving it some welly

I will give BT's tester a go and see what happens

quandam · Apr 11, 2009, 18:22:09

Have completed a BT test and the DL speed was 4420 which is pretty good (not the usual 6.5+). I do think that I should sit tight until the Easter holidays are completed and then take a look at the situation then. After all, speeds are pretty good even allowing for the little darlings doing their stuff

Rik · Apr 11, 2009, 18:23:29

What profile did you get, Q?

quandam · Apr 11, 2009, 18:56:46

Quote from: Rik on Apr 11, 2009, 18:23:29
What profile did you get, Q?

Rik

I think Sebby is on the right track here re exchange congestion due to Easter holidays. I feel a bit mean as my internet experience is mostly enjoyable and others have more serious problems than I have.

I think I will sit tight until the holiday period is over and then take a serious look at the situation after that

Thanks for your input.

Rik · Apr 11, 2009, 19:01:15

As long as your profile hasn't dropped, Q, chances are it's exchange congestion.

quandam · Apr 11, 2009, 21:32:18

Rik

I have just checked and my profile has dropped to 7150 from 8128. What is my next move?

Ted · Apr 11, 2009, 22:04:54

Quote from: quandam on Apr 11, 2009, 21:32:18
Rik

I have just checked and my profile has dropped to 7150 from 8128. What is my next move?

I believe 7150 is the highest profile and 8128 is the best sync rate.

quandam · Apr 12, 2009, 08:22:25

Quote from: Ted on Apr 11, 2009, 22:04:54
I believe 7150 is the highest profile and 8128 is the best sync rate.

Ted

It points to exchange congestion then. Many thanks.

quandam · Apr 12, 2009, 08:33:07

Just done some early (ish) speed tests and speeds have returned to normal (see immediately below). As it is fairly early on Easter Sunday morning one would assume that the exchange is quiet and without congestion. Happy Easter to all and thanks

Rik · Apr 12, 2009, 09:55:26

Glad to help, Q. That's as clear a case of exchange congestion as you will ever see, unfortunately.

Sebby · Apr 12, 2009, 14:12:14

Quote from: Ted on Apr 11, 2009, 22:04:54
I believe 7150 is the highest profile and 8128 is the best sync rate.

Yep, 7150 is the correct profile for 8128k sync.