EXPERTECH OUTLINE-
TELEPHONY FUNDAMENTALS
Lesson 1:
The telephone is invented
• Milestones
• Terminology (LATA, LEC, IXC, ITSP)
Lesson 2:
The Telephone Network
• Understanding sound propagation
• The traditional ILEC PSTN network, connecting to IXC
• PBX, key systems, Centrex
• Traditional vs. IP Telephony
Lesson 3:
Voice Transmission
• Terminology (frequency, passband, TDM, analog vs. digital; content vs. signaling)
• Digitizing voice (sampling, quantizing, companding, encoding per Shannon and Nyquist)
Lesson 4:
Switching
• Types of switches
• Media gateway functionality
Lesson 5:
Traffic Engineering
• Blocking vs. queuing
• Erlang calculations
• Trunk groups, law of large numbers
• Packet voice systems
Lesson 6:
Signaling and SS7
• Purpose of signaling
• In-band vs. out-of-band
• The SS7 network
Lesson 7:
Access Options
• POTS, ISDN, DSL, HFC, cellular systems
Lesson 8: Trunking Options
• T-Carrier (T-1/3), SONET