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13
votes
2answers
14k views

Maximum length of Ethernet over CAT5

As part of my course I’ve been reading the paper Ethernet: Distributed Packet Switching for Local Computer Networks. I understand that “classic” Ethernet (over coaxial cable) has a maximum length of ...
2
votes
1answer
3k views

Collisions in CSMA/CD Ethernet

I am confused about collisions in CSMA/CD Ethernet. When would a jam signal be sent? Why are jam signals sent? If two simultaneous packet transmissions interfere with each other, the two transmitting ...
1
vote
1answer
1k views

how does a NIC actually detect a collision when using CSMA/CD?

I understand that a network card detects collisions because their signal has a higher amplitude than normal signals. But why is that signal of higher amplitude? For example, say we have the simplest ...