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[ILUG] Connection speeds??

[ILUG] Connection speeds??

Fowler fowler at indigo.ie
Thu Mar 2 22:01:31 GMT 2000


Dave Burke wrote:
> 
> I could be wrong on this, but isn't the 56kps that your modem is rated at,
> 56 kilo BITS per second, ie 56000 BITS per second. So to translate this
> into BYTES per second (which is what your program reports downloads at),
> we must divide by 8 so a 56000 kilo BIT per second connection is equiv to
> 7 kilo BYTES per second......but obviously thats a theoretical max.
> 
> The mean connection for a v.90 modem is about 44 kilo bits per second,
> which when translated to bytes is 5.5 kilo bytes per second.
> Now thats your full bandwidth, you must cater for the TCP/IP over head
> that is required when transfering files (of which I have no idea, I just
> know it exists, refer to some posting the Nick Hilliard made 2 years ago
> on some iol.* newsgroup) and then factor in congestion and you end up with
> your 4 kilo bytes per second.
> 
> Does this make sense? I think it's right, but someone may well tell me I'm
> talking crap............time for caffine methinks..........
> 

The max you'll actually get is 56,300 or there abouts - something to do
with phone line quality and voltage and American FCC regulations
I regularily get a constant 5.9k a sec here

	regards
		Colin Fowler




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