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Standard User TomPoolHD
(regular) Tue 18-Mar-14 19:53:57
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SNR tweak and new faceplate making no change in speed?


[link to this post]
 
Hello, I have been using a Billion 7800N on a fairly short line for a few weeks and decided to upgrade to try and get a bit more speed, On a 27db attenuation im sure its more like a 16-17mbp/s connection expected but i cannot figure out why the router always syncs in the region of 14000-15000. Using a BT openreach MK2 faceplate i fitted today we have gained about 100kb/s as before with the old master socket witch i think is to do with when i restarted the router not the new face plate. I tweaked the snr on the router down to 4.5db from 6db and we gained no speed? Can someone explain as when i use a snr tweak on my line (53db attenuation) i can pull out 6000kb/s from a normal 4900kb/s sync.

Thanks in advance.

ADSL Status
Parameters
DSP Firmware Version A2pB025f.d22k
DMT Status No Defect
Operational Mode ADSL2+
Upstream 1181
Downstream 14328
SNR Margin(Upstream) 5.9
SNR Margin(Downstream) 4.4
Line Attenuation(Upstream) 13.9
Line Attenuation(Downstream) 27.0
Standard User babis3g
(regular) Thu 20-Mar-14 02:51:00
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Re: SNR tweak and new faceplate making no change in speed?


[re: TomPoolHD] [link to this post]
 
seems the provider has capped the speed so is not going more than 14000

try with the modem direct at the test socket with out any filter if will make any difference

Edited by babis3g (Thu 20-Mar-14 02:54:12)

Standard User tommy45
(knowledge is power) Thu 20-Mar-14 03:21:02
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Re: SNR tweak and new faceplate making no change in speed?


[re: TomPoolHD] [link to this post]
 
Is this a BT based broadband product ? if so it could be DLM or the IP profile for the line or a combination of but preventing you getting more speed, interleave can also have an impact on sync speed the most iv'e had from a 28db line was 19.5mbps sync that was with a 4.0db margin , but was a llu based connection so no DLM or IP profiles, and was set to fastpath, (ADSL2 + ) Then with a different provider ,same line with annex M i got 16.5mbps on a 3db margin with annex m disabled i only got 17.5mbps , Different hardware chipsets sometimes make a difference too,

Edited by tommy45 (Thu 20-Mar-14 03:26:19)


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Administrator MrSaffron
(staff) Thu 20-Mar-14 10:54:08
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Re: SNR tweak and new faceplate making no change in speed?


[re: tommy45] [link to this post]
 
IP Profile Only affects throughput, it does not limit sync speed. It is actually calculated from the sync speed.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Administrator MrSaffron
(staff) Thu 20-Mar-14 10:57:24
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Re: SNR tweak and new faceplate making no change in speed?


[re: TomPoolHD] [link to this post]
 
If this is a BT Wholesale connection is it possible a technique known as Banding has been applied that keeps the sync speed within a certain range has been applied.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User TomPoolHD
(regular) Thu 20-Mar-14 20:03:47
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Re: SNR tweak and new faceplate making no change in speed?


[re: tommy45] [link to this post]
 
Yes it's unlimited BT broadband, I'm using a Billion 7800n but have tried the BT HH5 and the sync speed is the same. The bt wholesale checker gives a reading of:
High Low High Low
FTTC Range A (Clean) 80 79.5 20 19.9 -- Available
FTTC Range B (Impacted) 80 70.2 20 17.9 -- Available


WBC ADSL 2+ Up to 8.5 -- 6.5 to 9 Available
WBC ADSL 2+ Annex M Up to 8.5 Up to 1 6.5 to 9 Available
ADSL Max Up to 8 -- 7 to 8 Available
WBC Fixed Rate 2 -- -- Available
Fixed Rate 2 -- -- Available
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