FTTC STATS

I said I would post some FTTC line stats a few days ago (sorry for the delay)

we only have two lines so far and only speed tests from one customer

Sync rates: 39669Kb/s - BRAS 35Mb/s (don't seem to be able to get upstream rate from BT)

Date Downstream Upstream IP Address Connection

27/07/09 06:51 32202.52 Kbps 1812.61 Kbps x.x.x.x VDSL

26/07/09 19:30 28086.88 Kbps 1737.21 Kbps x.x.x.x VDSL

26/07/09 05:45 33029.72 Kbps 1633.16 Kbps x.x.x.x VDSL

25/07/09 21:59 30796.78 Kbps 1698.36 Kbps x.x.x.x VDSL

25/07/09 19:28 5255.86 Kbps 1804.39 Kbps x.x.x.x VDSL

25/07/09 14:49 5256.39 Kbps 1750.68 Kbps x.x.x.x VDSL

25/07/09 14:35 5258.14 Kbps 1592.53 Kbps x.x.x.x VDSL

25/07/09 14:34 5257.14 Kbps 1765.76 Kbps x.x.x.x VDSL

25/07/09 08:42 31854.63 Kbps 1685.96 Kbps x.x.x.x VDSL

25/07/09 07:06 32608.02 Kbps 1741.24 Kbps x.x.x.x VDSL

25/07/09 00:09 28468.77 Kbps 1699.07 Kbps x.x.x.x VDSL

24/07/09 23:38 30255.95 Kbps 1674.87 Kbps x.x.x.x VDSL

As far as I know customer is very close to the cab (Muswell Hill)

Also the lower speed tests on Saturday we think BT dropped the BRAS although I have no idea why (I have asked)

Is that 35Meg bras profile for a 40meg sync going to be the standard? It's terrible.

Sync rates: 39669Kb/s - BRAS 35Mb/s (don't seem to be able to get upstream rate from BT)

Why not a 38Mb/s BRAS?
Why in 5Mb/s chunks?

In reply to a post by bookey:

Sync rates: 39669Kb/s - BRAS 35Mb/s (don't seem to be able to get upstream rate from BT)

Why not a 38Mb/s BRAS?
Why in 5Mb/s chunks?

Not sure it should be in 5Mb/s chunks, I have already asked BT about the BRAS as there is no info in the handbook about it. I will post back when I get an answer

Why in 5Mb/s chunks?

usually to reduce the number of changes required. It's the same % as 125k at 1M which is actually an improvement on ADSL

I know something else that would reduce the number of changes required, change them to 0 in fact....

In reply to a post by shaunkemp:

Also the lower speed tests on Saturday we think BT dropped the BRAS although I have no idea why (I have asked)

Ugh BT Wholesale.

I hope you guys can find a way to drop them and their nasty IP profiles like a hot potato when an OLO offers up a wholesale VDSL product.

Sorry to bring an old topic back but why on earth is BT using thier stupid BRAS system on FTTC platform. Cant they be like LLU ISP's where they let the throughput be 80% of thier sync rate?!

In reply to a post by shaunkemp:

In reply to a post by bookey:

Sync rates: 39669Kb/s - BRAS 35Mb/s (don't seem to be able to get upstream rate from BT)

Why not a 38Mb/s BRAS?
Why in 5Mb/s chunks?

Not sure it should be in 5Mb/s chunks, I have already asked BT about the BRAS as there is no info in the handbook about it. I will post back when I get an answer

Bump...

Any answer from BT as yet?

Thanks for the bump. I will get back to you in a bit.

Getting about 35Mbit throughput on a 40Mbit sync seems about right to me given roughly 15% TCP/IP overheads.

In reply to a post by FatPipeJunky:

Getting about 35Mbit throughput on a 40Mbit sync seems about right to me given roughly 15% TCP/IP overheads.

I gathered from previous posts that 35Mbit was a limit imposed by BTs stupid profiling system?

Yes it is, but if it were an LLU product with no such profiling system you wouldn't see over 35Mbit throughput anyway as roughly 5Mbit is being used for TCP/IP overheads.
It's much in the same way that on the 8Mbit DSL circuits BT has a maximum profile of 7150Kbit on an 8128Kbit line as 7150 is just 8128 less about 17% TCP/IP overheads.