Sign up with GoogleIs there anyone out there that is able to explain why when on Fastpath my SNR is 13.5db and when ASSIA is enabled the SNR drops to 8db? I have asked Telkom and they say it is not supposed to happen but cannot explain why it is happening.
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Is anyone able to explain
- Thread starter ronnie_94
- Start date
All DSL technologies work over a frequency band (ADSL uses 2MHz, VDSL a lot more) that is broken up into multiple channels (aka broadband
as opposed to narrowband).Each channel can accomodate a number of "bits" for communication. DSL requires and uses 3dB of SNR for a single bit, so the more bits a single channel encodes, the higher SNR is required and the lower the SNR margin that remains....
Now, ASSIA does spectrum management and I think what happens is that the system tries to allocate spectrum in such a way so that neighboring copper lines don't interfere too much with each other by ensuring that they don't all use the same frequency channels at the same time (or at the same levels).
This will influence your SNR margins because your router will now have to encode more bits in other channels to reach the target sync rate and the more bits allocated per channel, the less margin remains.
EDIT: I've also experienced what you have and only after countless complaints and attempts did Telkom get it right. Hoewever I think the guy that helped me back then is no longer part of Telkom's social media team.
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Thanks, you don't possibly know what the guy did? I would love for them to enable ASSIA on my line but without having it run right i don't want it enabled.
All DSL technologies work over a frequency band (ADSL uses 2MHz, VDSL a lot more) that is broken up into multiple channels (aka broadband
Each channel can accomodate a number of "bits" for communication. DSL requires and uses 3dB of SNR for a single bit, so the more bits a single channel encodes, the higher SNR is required and the lower the SNR margin that remains....
Now, ASSIA does spectrum management and I think what happens is that the system tries to allocate spectrum in such a way so that neighboring copper lines don't interfere too much with each other by ensuring that they don't all use the same frequency channels at the same time (or at the same levels).
This will influence your SNR margins because your router will now have to encode more bits in other channels to reach the target sync rate and the more bits allocated per channel, the less margin remains.
EDIT: I've also experienced what you have and only after countless complaints and attempts did Telkom get it right. Hoewever I think the guy that helped me back then is no longer part of Telkom's social media team.
The telkom guy removed the ASSIA profile from my line, later on, when assia kicked in again, things looked better. What else they did I have no idea.
I personally would prefer to not have ASSIA mess with my DSL sync, but getting Telkom to permanently exclude your line from ASSIA is also nearly impossible (some people have managed to get it right though).
I'm actually one of the ones that managed to get it off completely, had to complain long enough but it worked. Currently speaking to Terrick from telkom here on MYBB and hoping he can help me out with this.
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Mostly you can tell by your line stats, fastpath you will sync on a 10mbps line 10239 down and 1019 up, with interleaving/assia you sync 10237/10240 down and 1020 up. You can also check for interleaving depth.
How do you tell which you're on?
I assume I'm on ASSIA. Then change must have been recent though, as my line has been fine for >6months but is now ~60% of what it was
Telkom upgraded nearly a 100 exchanges to MSANs last month and another 80 or so before that.. a lot more people will see increased line speed and higher ping. Took me 3 months of complaining and sending in proof that ASSIA stuffed up my line, going on nearly a year and half ASSIA free..@ronnie_94 if you change numbers or request telkom test your line, if there is issues they will activate ASSIA to check whats wrong. You also might wanna check if you are indeed using your ADSL profile and not anyone else's. It has happened twice to me, telkom replaces a copper cable and swaps the cables around.
Yes it will. Our 10mb line at the office has a interleaver depth of 480 down and the SNR is locked at 6db ,we are not even 700m from the exchange.
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I thought so, oh well ill stick to fastpath until someone is able to change the depth
As far as I know the depth of interleaving has no effect on SNR; I could be wrong though.