Practical TCP/IP and Ethernet Networking for Industry

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the cable, and some short time later they ‘collide’. Almost immediately, node 2’s

transceiver recognizes that the signals on the cable are corrupted, and the logic

incorporated on the NIC asserts a collision detect signal. This causes node 2 to send a jam

signal of 32 bits of random data, and then stop transmitting. In fact, the standard allows

any data to be sent as long as, by design, it is not the value of the CRC field of the frame.

It appears that most nodes will send the next 32 bits of the data frame as a jam, since that

is instantly available.

This jam signal continues to propagate along the cable, as a contention ...