Tom Fogal wrote:
Now that I look it up, it is not as specific as either of us thought. In 802.3 it is simply defined (in clause 1.4.81) as 'A condition that results from concurrent transmissions from multiple data terminal equipment sources within a single collision domain.' It doesnt mention frames or differences on transmit/ receive pairs..
Agreed, but the fact that multiple transmissions are taking place has to be _detected_ somehow. The method implemented is to monitor the receive pair while transmitting. If the pattern does not match, an error has occurred.
CSMA/CD -may- be followed in full duplex mode, but it is not required.
Humm, the whole point of full duplex mode is that you can transmit while receiving. All this really means is that its OK for the bit pattern on the transmit and receive pair not to match. It is assumed that only two layer two or higher system will occupy any given physical medium, thus collision can not occur. Thus full duplex follows CSMA, but not CD.
Sorry to cut this short but I've got to bail, C
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