Re: (ASCEND) V.90 Rx Rate

["Ricardo Freire" <ricardo@allways.com.br>]

This subject was discussed some time ago, and someone pointed out a link
where it was discussed deeply.

Unfortunately, I don't have the link now, but I remeber the contents:
It has something to do with the 56K protocols. I remember K56Flex had the
same behavior.
In some way, the upstream and downstream transmissions affect each other
(some kind of interference), so the developers had to use slower upstream
speeds to allow the best performance downstreams - which is the most
interesting approach, since common traffic is 80% downstreams.

Another good point for discussion: someone suggested that everyone outside
USA might have this limitation with no reason, because several countries
don't have the power limitation on their lines (I know this is not true to
USA today, but at the time V.90 was released FCC had a regulation of power
that, as a side effect, only permitted 53Kbps connections).
Is it true? Maybe we in Brazil could reach 56/33.6 in our lines, if V.90
algorithms were modified? By now, we have very few customer with 54/28.8
rates, but we never got 56000bps.

This is what I remember about this issue...

Regards,

Ricardo Freire

-----Mensagem Original-----
De: Peter Dale <pjdale@ionia-mi.net>
Para: <ascend-users@bungi.com>; Nick Slager <nicks@albury.net.au>
Enviada em: Terça-feira, 29 de Junho de 1999 11:29
Assunto: Re: (ASCEND) V.90 Rx Rate


>
> ----- Original Message -----
> From: Nick Slager <nicks@albury.net.au>
> To: <ascend-users@bungi.com>
> Sent: Saturday, June 26, 1999 12:38 PM
> Subject: (ASCEND) V.90 Rx Rate
>
>
> > Hi,
> >
> > We have a small issue with a couple of our Maxen (a 4060 with TAOS
6.1.3,
> > and a 4030 with 7.0.1).
> >
> > Incoming v90 connections to both boxes always show an Rx rate of 28800,
> > whereas as far as I was aware, the v90 standard specified the
backchannel
> > rate at theoretically 33600, or perhaps 31200 in real world situations.
> >
> > Previously, when one of the above boxes had TAOS 5.0Apxx (which only
> > supported k56flex), backchannel rates for 56k-class connections would
> > typically be 31200bps.
> >
> > Anyone else seen/heard of this? Any solutions, or is that "just the way
it
> > is"?
>
> AFAIK, I never noticed an RX rate higher than 28.8 even with the
> 5.0ApXX loads. Currently running 6.1.3, and RX has never surpassed
> 28.8. I've also got a AS5300 the consistently does 31.2 on the RX rate
> though.
>
> Peter
>
>
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