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How do we move bits from one machine to another?
Bits → FSK → waves → matched filter → back to bits
Part of the Data Link layer.
CRC is a good method of error checking
G = 1001, D = 101110
Calculate R.
Solution:
R = 011
How do we avoid collisions?
Ethernet waits $k \cdot 512 \mu s$ where $k$ is a random number from the array $[0,1,...,n-1]$ where $n$ is the number of machines on the network
Can use FDM / TDM to split cable and internet
Cable Modem Termination System (CMTS) can determine who gets what slot of time/frequency