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Review

How do we move bits from one machine to another?

Bits → FSK → waves → matched filter → back to bits

Error Correction (5.2)

Part of the Data Link layer.

CRC is a good method of error checking

Practice Question

G = 1001, D = 101110

Calculate R.

Solution:

R = 011

Untitled

Collisions

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

Practice Question