Where it says "top" in reference to the articles below, this means the part of the article above the table of contents.

A few basic concepts
Wavelength
Frequency
Hertz
Binary
Truth value

The spectrum
Electromagnetic spectrum
Frequency allocation
Radio frequency (understand, don't memorize)
Spread-spectrum (read top and History, then skim)
Frequency-hopping spread spectrum (top only)

Circuits
Computer network
Electrical network (top only)
Telecommunications network
Telecommunication circuit
Virtual circuit
Digital electronics (this is a good intro to what you will be doing in Tech 3 in Spring Quarter)
Plain old telephone service
Modem (top only)
ISDN (Integrated Services Digital Network) (top only)
Bandwidth (don't sweat the Analog Systems section)
Channel communications
Simplex channel
Duplex telecommunications

Analog and Digital
Analog signal
Digital signal
Discrete signal
Quantization (top only)
Sampling rate
Digital signal processing
Aliasing (top and overview only)
Analog electronics
Amplifier (top only)
Repeater
Retransmission (first three paragraphs)
Error Correction

Cables and Connections
Cable
Twisted pair cable (top, then skim)
Coaxial cable (top only, but notice timeline at bottom)
Fiber optic cable (up to Other uses of Optic Fiber section, then skip down and read History section)
Dark fiber
Railway Mania
Firewire (top only)
USB (skip the Technical Details section)