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Standard User CurlyWhirly
(knowledge is power) Thu 16-Feb-12 22:01:32
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Sky broadband (LLU) upload speed


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I know I am only on day 6 of the 10 day training period but I am concerned that I am only getting 0.7 Mbps upload speed where as on O2 (LLU) I was getting over 1 Mbps.

My download speed is also reduced from almost 4 Mbps to 2.9 Mbps but I know why this is and apparently it's because Sky use a 7 db SNR margin meaning a slightly slower download speed.
Standard User 5km
(knowledge is power) Thu 16-Feb-12 22:11:04
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Re: Sky broadband (LLU) upload speed


[re: CurlyWhirly] [link to this post]
 
How about waiting until after day 10...

O2 Broadband Premium LLU
Now on twitter @timmay2
Standard User CurlyWhirly
(knowledge is power) Thu 16-Feb-12 22:13:18
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Re: Sky broadband (LLU) upstream speed


[re: 5km] [link to this post]
 
In reply to a post by 5km:
How about waiting until after day 10...

Yes I could do but I am just wondering if there is also a higher SNR margin on the upstream channel too, if so it would explain the lower upstream sync speed.


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Standard User 5km
(knowledge is power) Thu 16-Feb-12 22:16:25
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Re: Sky broadband (LLU) upstream speed


[re: CurlyWhirly] [link to this post]
 
What are your line stats now and what were the before?

I expect the upstream will also have a higher SNR margin, probably 7db like the downstream.

O2 Broadband Premium LLU
Now on twitter @timmay2
Standard User CurlyWhirly
(knowledge is power) Thu 16-Feb-12 22:20:44
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Re: Sky broadband (LLU) upstream speed


[re: 5km] [link to this post]
 
In reply to a post by 5km:
What are your line stats now and what were the before?


I don't know as I can no longer use the DMT tool like I did when I was with O2.

From memory my downstream attenuation was 53 dB and my upstream attenuation was around 33 dB.

I wouldn't expect these values to change much if at all ?



In reply to a post by 5km:
I expect the upstream will also have a higher SNR margin, probably 7db like the downstream.

Thought so.

Oh well it isn't that important as when my exchange is upgraded to FTTC, I will upgrade assuming I am able to i.e. the green cabinet that my house is connected to gets the FTTC treatment !
Standard User Oliver341
(knowledge is power) Thu 16-Feb-12 22:45:02
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Re: Sky broadband (LLU) upstream speed


[re: 5km] [link to this post]
 
In reply to a post by 5km:
I expect the upstream will also have a higher SNR margin, probably 7db like the downstream.

Of more significance is the upstream synch cap, which operates in addition to the target noise margin.

Oliver.
Standard User 5km
(knowledge is power) Thu 16-Feb-12 22:53:56
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Re: Sky broadband (LLU) upstream speed


[re: Oliver341] [link to this post]
 
What's the cap these days? I think it used to be 768kbps some 4 years ago when I had Sky. Isn't it now something closer to 1Mbps?

O2 Broadband Premium LLU
Now on twitter @timmay2
Standard User CurlyWhirly
(knowledge is power) Thu 16-Feb-12 22:55:26
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Re: Sky broadband (LLU) upstream speed


[re: Oliver341] [link to this post]
 
In reply to a post by Oliver341:
In reply to a post by 5km:
I expect the upstream will also have a higher SNR margin, probably 7db like the downstream.

Of more significance is the upstream synch cap, which operates in addition to the target noise margin.

I didn't even know there WAS a cap !
Standard User CurlyWhirly
(knowledge is power) Thu 16-Feb-12 23:01:54
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Re: Sky broadband (LLU) upstream speed


[re: Oliver341] [link to this post]
 
Just thought, after the 10 day training period is over, can I ask to have the upstream sync cap lifted ?
Standard User Oliver341
(knowledge is power) Thu 16-Feb-12 23:10:07
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Re: Sky broadband (LLU) upstream speed


[re: 5km] [link to this post]
 
In reply to a post by 5km:
What's the cap these days? I think it used to be 768kbps some 4 years ago when I had Sky. Isn't it now something closer to 1Mbps?

Depends which line profile is currently in operation. Line profiles cap both the upstream and downstream together.

Oliver.
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