At 01:07 PM 12/25/00, Bowen, Shawn wrote:
>According to IEEE NO, 100 Meters is the max cable distance for Half or Full
>100MB Ethernet over TP. In reality, Yes it will extend the range, The
>reason why is that at full duplex you can not have collisions, and
>collisions are the main reason for the distance limitation (Cross Talk comes
>into play as well). The reason behind this is that in the original IEEE
>spec the distance limitation was set so that a single 64Byte packet (the
>smallest) could be transmitted down the line and would collide with another
>packet before the 64Byte packet header had been completely transmitted, when
Minor correction: The distance limitation is defined so that if a station
is transmitting a minimum-size frame (64 bytes) and a collision occurs at
the other end of the network, the collision will reflect back to the sender
while the sender is still sending. If this didn't happen, the sender would
have stopped monitoring for a collision with its transmission, and would
not automatically retry. An upper layer would have to retransmit, which
takes a lot longer.
>this does not happen properly you see late collisions, these indicate a
>collision past the preamble header of the packet and indicate a cable length
>that is to long.
A late collision is one that happens past the preamble and past the first
64 bytes of the frame. A collision within the first 64 bytes is legal,
normal, and not late.
Priscilla
>If you need to even go close to the 100 Meter mark you
>should consider 100BaseFX or similar.
>
>Shawn
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Li
>Song
>Sent: Monday, December 25, 2000 4:33 AM
>To: [EMAIL PROTECTED]
>Subject: is this statement true ??
>
>"full-duplex can be used over longer distance than
>half-duplex" ??
>what 's your opinion ??
>
>
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Priscilla Oppenheimer
http://www.priscilla.com
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