ADSLMax - How Likely Is This?

We have regraded two services, a 512kb and a 1mb service to ADSLMax.
Both are at the same address and connect to the same exchange.

Both initially started as reporting faster connection and achieved
faster throughput. They were fairly modest speed gains, up to
1568kbps from the 1mb line and 960kbps for the 512kb, but due to the
line length, this was expected and accepted by us. Both lines seemed
entirely reliable at the new speeds, no dropouts and were monitored by
NetMedic as stable. All was well.

However, one week later, although both are still reporting as
connected as the same speeds, both have reverted to precisely the
speeds that they had achieved prior to the regrade. Net result - no
speed benefit whatsoever on either line, but a cap on data throughput.

That both lines have behaved exactly the same and have dropped back to
the exact same speed they achieved before the regrade is surely too
much of a coincidence to ignore. Zen support say this is normal and
there is nothing they can do, but it seems highly suspicious to me.

Anyone shed any light on this?

TIA

Andrew wrote:

> However, one week later, although both are still reporting as
> connected as the same speeds, both have reverted to precisely the
> speeds that they had achieved prior to the regrade.

This is a known problem at BT with their BRAS profiles - somehow they
get reset. They say it will all be fixed by the end of the month.

BRAS == Broadband Access Servers

Dick

Andrew wrote:

> Both initially started as reporting faster connection and achieved
> faster throughput. They were fairly modest speed gains, up to
> 1568kbps from the 1mb line and 960kbps for the 512kb,

> That both lines have behaved exactly the same and have dropped back to
> the exact same speed they achieved before the regrade is surely too
> much of a coincidence to ignore. Zen support say this is normal and
> there is nothing they can do, but it seems highly suspicious to me.
>
> Anyone shed any light on this?

expected behaviour. MaxDSL was designed for 2M and faster and uses 0.5M
increments (see table below).

Unless your 512k line gets over 1152 sync it remains a 0.5M line, and
the 1M line needs to exceed 1728 to become a 1.5M line. Neither of
these appear to have happened so you are where you started, but with a
faster upload.

Phil

The following table shows the IP rate you can expect for each ADSL sync
rate (as reported by your router)
ATM rate
from IP rate
288K ¼M
576K ½M
1152K 1M
1728K 1½M
2272K 2M
2848K 2½M
3424K 3M
4000K 3½M
4544K 4M
5120K 4½M
5696K 5M
6240K 5½M
6816K 6M
7392K 6½M
7968K 7M
8128K 7.15M

On 25 May 2006 11:16:46 -0700, "PhilT" <(E-Mail Removed)> wrote:

>Andrew wrote:
>
>> Both initially started as reporting faster connection and achieved
>> faster throughput. They were fairly modest speed gains, up to
>> 1568kbps from the 1mb line and 960kbps for the 512kb,
>
>> That both lines have behaved exactly the same and have dropped back to
>> the exact same speed they achieved before the regrade is surely too
>> much of a coincidence to ignore. Zen support say this is normal and
>> there is nothing they can do, but it seems highly suspicious to me.
>>
>> Anyone shed any light on this?
>
>expected behaviour. MaxDSL was designed for 2M and faster and uses 0.5M
>increments (see table below).
>
>Unless your 512k line gets over 1152 sync it remains a 0.5M line, and
>the 1M line needs to exceed 1728 to become a 1.5M line. Neither of
>these appear to have happened so you are where you started, but with a
>faster upload.
>
>Phil
>
>The following table shows the IP rate you can expect for each ADSL sync
>rate (as reported by your router)
>ATM rate
>from IP rate
>288K ¼M
>576K ½M
>1152K 1M
>1728K 1½M
>2272K 2M
>2848K 2½M
>3424K 3M
>4000K 3½M
>4544K 4M
>5120K 4½M
>5696K 5M
>6240K 5½M
>6816K 6M
>7392K 6½M
>7968K 7M
>8128K 7.15M

Excellent information. Thanks. I wonder why Zen didn't know that.....