line speed

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simonbee

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I recently asked to have my VDSL line speed upgraded from 20 Mbps to 40 Mbps. Since then, my upload speed has increased to 3072 kbps but, according to my modem, the download speed is 26208 kbps. Is this therefore the maximum line speed I can get? Telkom say I am on a 40 Mbps profile.

I upgraded mainly for the increased upload speeds, but it would be nice to get even bigger download speeds ( I am not complaining though!) :)
 
Post your line stats with it sync'd at 26Mbit.

Which router are you using? A router with a different chipset MIGHT give you a slight increase in speed but I doubt it will be worth forking out the cash for one and even then it is not guaranteed.

Chances are that is the max speed you can get on your line. If it is a Broadcom chipset and your SNR is still decent you might be able to force your router to sync at a higher speed although your SNR will go down. You could play with that until you are happy with a combination between a stable line and faster speeds :)
 
here are my line stats

noise margin upstream: 6 db
noise margin downstream: 6 db
output power upstream: 12 db
output power downstream: 7 db
attenuation upstream: 0 db
attenuation downstream: 28 db
CRC upstream: 16097
CRC downstream: 4519

speedtest shows a download of 24.6 and an upload of 2.8
 
Your maximum "speed" will be "up to 40Mbps" dependant on the distance to your MSAN/ISAM and the quality of the entire copper connection from the MSAN/ISAM to your router.
 
MickeyD said:
Your maximum "speed" will be "up to 40Mbps" dependant on the distance to your MSAN/ISAM and the quality of the entire copper connection from the MSAN/ISAM to your router.
Click to expand...

i understand that. however, should the modem show 40Mbps or the maximum I can get?
 
6dB for SNR is the minimum required for a connection if I am not mistaken.

What router are you using?
 
PsyCLown said:
6dB for SNR is the minimum required for a connection if I am not mistaken.

What router are you using?
Click to expand...

Not necessarily but lower could be unstable. It's very possible to have a 3dB or 4dB SNR and still sync fine if you have a decent line and router that could also boost your sync rate a couple of megabits but that is a gamble in it self and might not be worth the effort and money to get a router to manually manipulate the stats to get a higher sync rate....

I actually did put the pieces together now and see that looks like Telkom takes 6dB on SNR to be your 'maximum' and will only sync at the speed that pushes your SNR to 6dB and nothing more because more would mean lower than 6dB SNR.

Very interesting actually.

@op if your downstream SNR is 6dB that would most likely be the maximum Telkom would allow you to go.

Here is a example of how it works.

You can have a 40Mbps but your line can't because of distance or because of some other element like poor copper quality or bad link somewhere maybe you would get them maximum speed that Telkom think you can get.
Your line will sync at whatever speed pushes your downstream dB to 6. So once you reach 6dB that will be the max spee you sync at and this is why when you restart your router you might find that you are syncing at 26208k before the restart but 26104k after the restart or something like that. It might vary just slightly.
 
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