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523 posts

Ultimate Geek


Topic # 91924 23-Oct-2011 14:48 Send private message

I bought a new house a month ago, and I'm a bit disappointed with the sync to the exchange. I'm currently on naked bb with Vodafone. Only one jack point of three is in use, with the Vodafone complete modem/router combo plugged in. Stats are as follows

Downstream 6610kbps. Max Rate 7796. Attenuation 19.9 snr 9.5
Upstream is over 1mbps so thats fine attenuation 35

I'm guessing it might be a wiring issue. Is there anyone I can call to have a look at it. Corus don't seem to care as long as I have an active connection.

Any advice would be appreciated

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  Reply # 536727 23-Oct-2011 15:34 Send private message

Some details of the house wiring would be useful.

Structured cabling / daisy chained? Do you have a master filter?


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  Reply # 536728 23-Oct-2011 15:37 Send private message

I'm also curious as to how you have a 9.5dB noise margin, this should be ~12dB on a Telecom Wholesale connection and 6dB on most ULL connections.

Are you connected to cabinet or exchange, ULL or wholesale, and what is your approximate distance?




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Ultimate Geek


  Reply # 536781 23-Oct-2011 19:36 Send private message

sbiddle: Some details of the house wiring would be useful.

Structured cabling / daisy chained? Do you have a master filter?



Thanks for your reply.

I believe it is daisy chain. The wiring runs under the house, which was constructed in the 70's. I don't believe there is a master filter.

I am on ULL with Vodafone. Connected directly to the MSY/Exchange Im pretty sure looking at the map that I'm not connected to a cabinet.



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  Reply # 536787 23-Oct-2011 19:59 Send private message


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  Reply # 536792 23-Oct-2011 20:21 Send private message

Your modulation appears to be ADSL2 - can you set it to ADSL2+ ?



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  Reply # 536795 23-Oct-2011 20:35 Send private message

RunningMan: Your modulation appears to be ADSL2 - can you set it to ADSL2+ ?


I thought the same myself. After using the advanced login and un-ticking all options other than ADSL2+ saving and rebooting twice for some reason it still says ADSL2. With fresh logins I can confirm that no other box is selected in the modulation menu

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  Reply # 536800 23-Oct-2011 21:19 Send private message

Being on the edge of the MSY/Exchange area instead of a cabinet is the reason for 19dB attenuation -- means you have a distance issue but shouldn't be too bad. Your noise margin has fluctuated a bit for it to end up with 8dB, and ADSL2 has slowed down to keep the connection stable. It has may have switched to a long reach profile because of the high attenuation but should still be able to pickup faster speed if the signal can be improved.

Combined with the line distance, house wiring could have quite a noticeable effect on the signal and noise margin so, as sbiddle mentioned, a master filter would be a sensible investment.




Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^



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Ultimate Geek


  Reply # 536801 23-Oct-2011 21:24 Send private message

webwat: Being on the edge of the MSY/Exchange area instead of a cabinet is the reason for 19dB attenuation -- means you have a distance issue but shouldn't be too bad. Your noise margin has fluctuated a bit for it to end up with 8dB, and ADSL2 has slowed down to keep the connection stable. It has may have switched to a long reach profile because of the high attenuation but should still be able to pickup faster speed if the signal can be improved.

Combined with the line distance, house wiring could have quite a noticeable effect on the signal and noise margin so, as sbiddle mentioned, a master filter would be a sensible investment.


Thanks for your reply.

I've lived in 5 other houses with ADSL all of them have had higher attenuation that this house, So I didn't think that would be the issue. Who could I get to install a splitter? Also would I need one, as We don't have any phones plugged in?

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  Reply # 536838 24-Oct-2011 07:18 Send private message

Can you find where the line comes in to your house easily (demarc)? If so, if you have moderate hanyman skills, you can install a filter yourself without too much drama.

If you are running naked DSL with no phones, you don't technically need the filter, but it will isolate any dodgy existing wiring...



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Ultimate Geek


  Reply # 536842 24-Oct-2011 07:37 Send private message

RunningMan: Can you find where the line comes in to your house easily (demarc)? If so, if you have moderate hanyman skills, you can install a filter yourself without too much drama.

If you are running naked DSL with no phones, you don't technically need the filter, but it will isolate any dodgy existing wiring...


My handyman skills are very average, but I'd be willing too give it a go. Where can you purchase filters from? And are there any special tools needed for the job?




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  Reply # 536847 24-Oct-2011 09:02 Send private message

Wills1:
RunningMan: Can you find where the line comes in to your house easily (demarc)? If so, if you have moderate hanyman skills, you can install a filter yourself without too much drama.

If you are running naked DSL with no phones, you don't technically need the filter, but it will isolate any dodgy existing wiring...


My handyman skills are very average, but I'd be willing too give it a go. Where can you purchase filters from? And are there any special tools needed for the job?



Ok I've had a look under the house, and I think I'd rather pay someone who knows what they are doing.
There is no box as such just cables coming out of the ground. It looks a bit messy to me. What might it cost for someone to come out and have a look?

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  Reply # 536858 24-Oct-2011 10:06 Send private message

RunningMan: Can you find where the line comes in to your house easily (demarc)? If so, if you have moderate hanyman skills, you can install a filter yourself without too much drama. 


Do people install the filter in the demarc box itself?  Seems too small to fit it in there plus another line going out direct to the modem.  Just wondering where people put the master filter on a retrofit job as opposed to a new build with a central hub type setup.

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  Reply # 536873 24-Oct-2011 11:03 Send private message

Jaxson:
RunningMan: Can you find where the line comes in to your house easily (demarc)? If so, if you have moderate hanyman skills, you can install a filter yourself without too much drama. 


Do people install the filter in the demarc box itself?  Seems too small to fit it in there plus another line going out direct to the modem.  Just wondering where people put the master filter on a retrofit job as opposed to a new build with a central hub type setup.


A master filter fits very nicely in the demarc box - it's exactly what i've done at my place. 

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  Reply # 536881 24-Oct-2011 11:15 Send private message

Wills1: I've lived in 5 other houses with ADSL all of them have had higher attenuation that this house, So I didn't think that would be the issue. Who could I get to install a splitter? Also would I need one, as We don't have any phones plugged in?


Whether you have a phone or not actually means very little. Every jackpoint connected to a line causes interference, if you have unused jackpoints these will all cause reflections on the line and impact on DSL performance. You could also very easily have poor connections in the wiring that will also impact on the DSL performance.

Reality at the end of the day is that the vast majority of users with ADSL2+ without a master filter installed will have degraded performance. In the ADSL days these weren't so important, but with ADSL2+ and VDSL2 are essential.






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Ultimate Geek


  Reply # 536893 24-Oct-2011 11:58 Send private message

sbiddle:
Wills1: I've lived in 5 other houses with ADSL all of them have had higher attenuation that this house, So I didn't think that would be the issue. Who could I get to install a splitter? Also would I need one, as We don't have any phones plugged in?


Whether you have a phone or not actually means very little. Every jackpoint connected to a line causes interference, if you have unused jackpoints these will all cause reflections on the line and impact on DSL performance. You could also very easily have poor connections in the wiring that will also impact on the DSL performance.

Reality at the end of the day is that the vast majority of users with ADSL2+ without a master filter installed will have degraded performance. In the ADSL days these weren't so important, but with ADSL2+ and VDSL2 are essential.





So a master filter would sort out any issues I have with crap cabling?

Can I also select which jackpoint I want to use? At the moment I'm using the point that was installed by a sky tech. Its the closest jackpoint to the telephone cables from the street. Literally a few meters, but it is probably spliced from the jack in the kitchen, which is further away from the cable entrance to the house. I suspect the kitchen jackpoint is the main jackpoint.

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