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Standard User DrTeeth
(knowledge is power) Mon 09-Jan-12 20:49:45
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FTTC profiles tweaked again?


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Hi,

Have the profiles been tweaked again? I used to d/l at 4.70 MB/s after the recent profile change. My max is now 4.15MB/s. At the same time, my upload speed has increased from 0.8MB/s to 1MB/s.

DrT

Stress - the condition brought about by having to resist the temptation to beat the living daylights out of someone who richly deserves it.

Edited by DrTeeth (Mon 09-Jan-12 22:11:40)

Standard User orly
(fountain of knowledge) Tue 10-Jan-12 00:01:08
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Re: FTTC profiles tweaked again?


[re: DrTeeth] [link to this post]
 
The frequencies used for download and upload seem to be capable of shifting around to provide a more balanced download/upload speed ratio

This might be have occured for you

---
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Standard User Bald_Eagle1
(member) Tue 10-Jan-12 07:37:53
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Re: FTTC profiles tweaked again?


[re: orly] [link to this post]
 
If you could post your xdslcmd info --pbParams data we could see which frequency bands are in use for your connection.


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Standard User DrTeeth
(knowledge is power) Tue 10-Jan-12 19:37:43
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Re: FTTC profiles tweaked again?


[re: orly] [link to this post]
 
But why would they shift after several weeks?

Stress - the condition brought about by having to resist the temptation to beat the living daylights out of someone who richly deserves it.
Standard User WWWombat
(committed) Tue 10-Jan-12 21:08:11
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Re: FTTC profiles tweaked again?


[re: orly] [link to this post]
 
We've seen profiles where the 17a band plan boundaries are very slightly different, but I don't think they shift around at all.

With the 8c profile, BT followed the well-known 997 band plan, truncated at 7.05MHz. Alongside the rollout of the 17a profile, they've chosen to change to the 998 band plan.

I don't think BT actually have scope to go changing these plans either - I think it is specified in the ANFP.

The main difference in going from 997 to 998, in the existing frequency part, is that the band from 3 - 3.75MHz switches from upstream to downstream, which will be a change usable for many users, probably up to 1km distant. There is additional benefit in the new frequecies too - where the 7 - 8.5MHz region is downstream in the 998 plan, but would have been upstream if they tuck to the 997 plan.

So there have certainly been benefits to the downstream, but I doubt if we'll see any more significantg shifts in the near future.
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