[flinx]

Das Ethernet ohne Kollisionen arbeiten könnte ist Wunschdenken.

IMHO nicht korrekt.
Aus http://www.dcs.gla.ac.uk/~bryce/Ethe...ull-Duplex.htm :

Full-Duplex Flow Control
With the primary limitation, collisions, removed the new limiting factor is the speed at which the switches can read the addresses from incoming packets and forward them. Buffers are used in the switches to hold the packet whilst its address is being examined. If there are consistently more packets going into these buffers than leaving then these buffers will overflow. To compensate for this IEEE introduced an extension called 802.3x. 802.3x introduces a flow control system called "MAC Control Protocol". This protocol works with existing frames and adds the ability for a request for pause. A MAC control frame has the hex value 8080 in the Ether type or SNAP control field and the frame is transmitted to a special multicast address (01-80-C2-00-00-01) which is intended for use with pause frames. The Control field of the frame contains 0001 to indicate a pause frame followed by a 2 byte parameter indicating the length of the pause. The length of the pause is measured in "quanta" which equal 512 bit times. The field indicating the length of the pause has a range of 0-65,535 corresponding to the number quanta.

Aus http://www.techfest.com/networking/lan/ethernet1.htm :

In 1997, the IEEE 802.3x standard became available which defined "full-duplex" Ethernet operation. Full-Duplex Ethernet bypasses the normal CSMA/CD protocol to allow two stations to communicate over a point to point link. It effectively doubles the transfer rate by allowing each station to concurrently transmit and receive separate data streams.

Aus z.B. http://www.edimax.com/html/english/p.../EN-9130TX.htm , http://www.surecom-net.com/pd-switch-808x_sx_ax.htm

Specifications:
Network Standard:
IEEE 802.3
IEEE 802.3u
IEEE 802.3x

Soll ich auf Gigabit-Ethernet umsteigen? Das wäre doch ein Heimnetzwerk-Overkill! Das kann sich doch keimer leisten, und das nur um kollisionen zu vermeiden.

Na, brauchst nicht.