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VanMildert
Aspiring Contributor
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Message 1 of 25

Sync speed gradually reducing

Using Home Hub 4, sync speed has reduced from approx 17MBps to a current value of 10.4MBps over a period of about 4 months. I have tested house telephone wiring impact and established it makes very little difference. During this period there have been no additions to the devices used within the home. Any ideas why this drop should have occurred would be appreciated

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24 REPLIES 24
Keith_Beddoe
Distinguished Sage
Distinguished Sage
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Message 2 of 25

Re: Sync speed gradually reducing

Welcome to this forum.

 

Probably increased crosstalk from other new broadband circuits, especially Infinity.

These reduce the number and quality of the available tone frequencies needed to carry the broadband signal.

 

If you look in the home hub event logs, you should be able to see what the current noise margin is, just after you restart the home hub.

Generally a noise margin of 6dB is typical.

Sometimes, restarting the home hub early in the morning, can result in a higher synch speed.

 

This page has a lot of info on it, especially the bit by RogerB.

http://forumhelp.dyndns.info/speed/speed_drop.html

 

 

john46
Distinguished Sage
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Message 3 of 25

Re: Sync speed gradually reducing

the log entries should look like this

19:11:29, 07 Nov. (2290101.460000) DSL noise margin: 7.00 dB upstream, 6.10 dB downstream
19:11:29, 07 Nov. (2290101.390000) DSL line rate: 448 Kbps upstream, 288 Kbps downstream
imjolly
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Message 4 of 25

Re: Sync speed gradually reducing

enter your phone number and post results  remember to delete number  https://www.btwholesale.com/includes/adsl/main.html



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VanMildert
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Message 5 of 25

Re: Sync speed gradually reducing

Thanks.

 

I will check out the noise level and give the early morning reset a try

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imjolly
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Message 6 of 25

Re: Sync speed gradually reducing

I know when I used to reset my router I found about lunchtime was best as noise margin was usually at highest giving better scope for faster speed



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VanMildert
Aspiring Contributor
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Message 7 of 25

Re: Sync speed gradually reducing

Reset my hub this morning and here are the values from the log:

 

07:53:35, 23 Feb.

( 98.070000) DSL noise margin: 6.00 dB upstream, 15.10 dB downstream

07:53:34, 23 Feb.

( 97.050000) DSL line rate: 1167 Kbps upstream, 10391 Kbps downstream

Are these acceptable?

 

How can I check if a device within the house is having an impact on the speed?

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imjolly
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Message 8 of 25

Re: Sync speed gradually reducing

your noise margin is very high at 15.1db as normal is about 6db and for some with very good line it can be 3db.  this high noise margin is the reason for the lower speed

 

 



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imjolly
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Message 9 of 25

Re: Sync speed gradually reducing

try quiet line test  dial 17070 option 2  should be quiet and best with corded phone  if cordless then dull hum normal

 

are you connected to test socket with new filter?  if not is it possible to connect to test socket especially if you have extension sockets which may be causing a problem



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john46
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Message 10 of 25

Re: Sync speed gradually reducing

Due to all the disconnections / restarts of your hub you are now in a banded profile you need to maintain a stable connection for 3/5 days and you will start to lift out of the banding automatically
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