They would both start at the same time. The 100bT interface would be
placing bits on the wire faster than the 10bT interface and would complete
placing bits on the wire in 1/10 the time. But those bits can't actually
move any faster through the copper medium. The copper isn't more conductive
(it's still Cat 5(e)) and the speed of light hasn't increased. So the bits
that are placed on the wire will move through the wire at exactly the same
rate. If the bits for 10bT consume 5 meters of cable megth before the NIC
moves the the next bit then a bit for 100bT will be 1/2 meter (.5 meters)
before the next bit is placed on the wire. This is just an example, I'm not
sure of the exact lengths of the bits on the wire, but the point is that the
bits can't move any faster because the speed of electricity through copper
is fixed. The difference is that the 100bT card is placing bits on the wire
10x faster than the 10bT card. And 1000bT (gigabit ethernet) places bits on
the wire 100x faster than the 10bT card (or each bit would be .05 meters (5
centimeters), given the above example).
So, on 100bT the end of the packet (the whole packet) would arrive before
the 10bT would be done (in fact depending on the size of the packet 10bT
might still be sending the preamble or headers), but the start of the
packets (first bit of the preamble) would arrive at the same time.
HTH,
Thanx
Kevin L. Kultgen
Disclaimer: YMMV, the 5/.5/.05 meters are all fictional, I was told at one
point how long a bit is on the wire but I forgot it. If I have anything
that needs clarification (or correction) then please feel free to add it or
request it. This is helping me too, because I'm looking at taking the
CNX-Ethernet exam (http://www.mycnx2000.com, http://www.cnx2000.com).
----- Original Message -----
From: "Tim O'Brien" <[EMAIL PROTECTED]>
To: "Kevin L. Kultgen" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>
Sent: Thursday, October 05, 2000 5:49 AM
Subject: Re: Ethernet Trivia
> So if this were the case, and they both started at the same time and used
> the same size frame/packet I would think that the 100Mbps interface would
> get the packet onto the wire faster hence it would arrive sooner than the
> 10Mbps interface which would probably still be putting the data on the
wire.
> Correct?
>
> Tim
>
> ----- Original Message -----
> From: "Kevin L. Kultgen" <[EMAIL PROTECTED]>
> Newsgroups: groupstudy.cisco
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, October 04, 2000 12:35 PM
> Subject: Re: Ethernet Trivia
>
>
> They would bith reach the destination at the same time (speed of
electricity
> through copper). The difference is in the rate at which the bits are
placed
> on the wire, the Fast Ethernet would be placing 20 bits of information
> (actually encoded as 24 bits) on the wire for every 2 bits that the 10bT
> would place on the wire. At least his is my understanding of 100bT vs
> 10bT..
>
> Anybody else have different(better?) interpretations?
>
> --
> Kevin L. Kultgen
>
>
> ""Frank"" <[EMAIL PROTECTED]> wrote in message
> 8rfksm$l2s$[EMAIL PROTECTED]">news:8rfksm$l2s$[EMAIL PROTECTED]...
> > Let's say we have a 10Mbps and 100Mbps interface. Both transmit the
same
> > sized
> > frame over the same type of media and over the same distance and neither
> > experience
> > a collision. Which will get to the destination first?
> >
> >
> > **NOTE: New CCNA/CCDA List has been formed. For more information go to
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>
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