Sorry,
I really meant a 30Mb attachment
JimB
----- Original Message -----
From: "James Button" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, July 26, 2006 3:29 PM
Subject: Re: Connect Speed Test
> If your ISP is also running your email store then:
> send yourself an email with a 30Gb attachment:
> Time how long it takes to go from the outbox to the sent
> ( how long the lights on the modem are going 'well' indicating the message
> is being sent!)
>
> Then do a receive - and time that
>
> Calculate 10 bits of transmission per byte of data,
> and that should give you an idea of the speed of the uplink, and downlink
> speeds at that time.
>
>
>
> The problem with going further than your ISP is that you will also be
adding
> in the transfer on time from your ISP to the next in line, together with
any
> delays they have in their connection, negotiation, buffering etc.
>
> An 8Mb connection is not used much 'talking' to your bank's system if they
> are running 500 'concurrently connected' links to users through a 56Kb
link
> The other end is probably only passing your link data at an average of
100b
> so your link is 'idle' for 99% of the time..
> and then there is the question of contention for your link -
> a link sold as 'Up to 8Mb', but with a contention factor of 50 means that
> there could be just you using the link, or you could be sharing it with 50
> other users - that's 160Kb each ... assuming the 'UP to' bit isn't
actually
> 1Mb -
> (As they say experience the real thing - and the advertisement that a
> dandruff shampoo will get rid of up to 100% doesn't mean it will get rid
of
> any.. but no one can claim to be able to get rid of more.)
>
> JimB
>
>
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