Per ANSI/IEEE 8032.3x Ethernet Cat 5, 6, and 7 cables have only two ports,
additional ports are forbidden. Both ports are transformer isolated for a
100-ohm impedance termination. Communication to other network locations is
always through an active device (e.g. hub, switch, router).
The only variation is full-duplex communication where 4 lines are active and
connexion is to a switch (hubs do not support full duplex). In full-duplex
both ports have two transformer terminations, one for transmit and the other
for receive.
Ethernet adapter cards (NICS) support full duplex, but negotiate to half
duplex if connected to a hub.
.
Honeywell
David W. Sterner
Quality Assurance Engineering
Security & Custom Electronics
165 Eileen Way
P.O. Box 9035
Syosset, NY 11791
Phone: (516) 921-6704 x6970
Fax # (516) 364-6953
david.ster...@honeywell.com
<http://www.honeywell.com>
david.ster...@ieee.org
<http://www.IEEE.LI>
Electromagnetic Compatibility
IEEE 05888136
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