[X4U] Streaming Confusion with QT Data Rates

[revDAVE]

On 9/25/04 8:51 AM, "Stroller" <MacMonster at myrealbox.com> wrote:

> Obviously I've missed a posting here here, but DSL is typically sold,
> for marketing purposes, in kilobits, and in powers of two of them, for
> convenience of packaging & management.
> 
> In the UK we have ADSL services:
> 256kbits down, 128kbits up = 32kbytes down, 16kbytes up
> 512kbits down, 256kbits up = 64kbytes down, 32kbytes up
>     - most domestic users are on this one, and many small offices, too.
> 1024kbits down, 256kbits up = 132kbytes down, 32kbytes up   "megabit
> service"
> 2048kbits down, 256kbits up = 264kbytes down, 32kbytes up   "2 megabit
> service"
> 3072kbits down, 256kbits up = 384kbytes down, 32kbytes up   "3 megabit
> service"
> 
> As I recall, the DSL modem actually achieves slightly higher
> performance than this, a 512 one pushing c 600 kilobits in a second in
> order to compensate for the overhead of error-checking & routing &
> stuff. Equally one is unlikely to see one's download meter hit 64
> kilobytes on such a connection, as FTP (or whatever protocol one is
> using to get the file) has its own overheads. I'm very happy when I see
> 50kilobits or so on a download.
> 
> 56k modem = 56kbits = (56/8 =) 7 bytes/second, but that's misleading.
> As I recall the marketing of 56k is different - I think that figure
> allows for compression (which may not always be possible) but not for
> protocol overhead.
> 
> Stroller.

Stroller -  thanks for the clarification.  That helps a lot.


--
Thanks - RevDave
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