Copper cables:

10Base2		10Base5		100BaseT
185m		500m		100m
BNC		AUI		RJ45
thin coaxial	thick		twisted pair
30 hosts/seg	100 hosts/seg	1 host or hub



Electrical Signals:
	Propagation
	Attenuation
	Delay/latency
	Reflection
	Collision
	Noise