[aclug-L] Re: Having troubles wrapping my brain around this concept.

[Jonathan Hall <jonhall@xxxxxxxxxxxx>]

10mbit ethernet = 10,000,000 BITS per second = 1,250,000 bytes/sec
52x CD = 5,980,000 bytes/sec _IF_ 52x were actually attainable.  Most 52x
CD drives never reach that speed, and when they do, it's usually just for a
moment.  Many don't even go that fast _AT ALL_ without changing jumper
settings, even though they're advertised as 52x (or faster).

Also keep in mind that network traffic and NIC brands will have a HUGE
impact on actual network performance.  The most I've ever seen over 10bT
ethernet is about 900kB/sec (maybe bursts of 1mB/ses), and that was using
some fairly nice PCI NICs.  10b2, while it uses a 10mbit signaling rate,
just like 10bT, it is slower (although not always a "lot" slower--depending
on many things).  If you're converting from 10b2 to 10bT, and back again,
then you'll undoubtedly notice a big performance hit with that alone.

If you're using slower NICs (older ISA NICs, for instance), you may be doing
well to achieve 300kB/sec (about the speed of a 2x CD-ROM drive).

At any rate, on a good day, with good ethernet cards and an otherwise quiet
network, you might get the equivolent of an 8x CD-ROM performance out of a
10mbit network.



On Fri, May 03, 2002 at 10:08:10AM -0500, David Carmichael wrote:
> 
> Having troubles wrapping my brain around this concept;
> 
> So will a 10Mbps network connection have the bandwidth to move all the data
> that a 52X CD-ROM can pump out?
> 
> Are the blow numbers correct??
> 
> 10Mbps = 10,000,000 bytes per second
> 52X = 624000 bytes per second
> 
> Or should the 52X = 4,992,000 bytes per second?
> 
> So a 52X CD-Rom would only use half of the bandwidth of a 10-base-T coaxial
> network connection??
> 
> --David
> 
> 
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