V1: Fundamentals of Telecommunications
Part 1 Fundamentals of Telephony
1.03 The Public Switched Telephone Network (PSTN)
1.05 Analog Circuits
1.07 What is Sound?
1.09 The Voiceband

1.11 Plain Ordinary Telephone Service (POTS)
1.13 DTMF Address Signaling
1.15 Signaling System 7 (SS7)
Part 2 Telecom Equipment
2.03 Telephone Switches
2.05 PBX vs. Centrex
2.07 Voice VPNs
2.09 Call Centers
Part 3 The Telecommunications Industry
3.03 US Domestic Telcos
3.05 AT&T and Verizon
3.07 Canadian Telephone Companies
3.09 PSTN Switching Centers Before Competition
3.11 Accessing The Interexchange Carriers
3.13 Competitive Local Exchange Carriers (CLECs)

V2: Fundamentals of Telecommunications 2
Chapter 1 Digital Communications
1.03 Why Digital?
1.05 Analog and Digital: What Do We Really Mean?
1.07 Continuous Signals, Discrete Signals
1.09 Voice Digitization (Analog ? Digital Conversion)
1.11 Voice Reconstruction (Digital ? Analog Conversion)
1.13 Voice Digitization Summary
1.15 The Digital Hierarchy: Industry Standard Line Speeds
1.17 Popular Technologies: Digital Carrier Systems
1.19 ISDN BRI and PRI
1.21 Digital Circuit Voice Applications
1.23 Digital Circuit Data Applications
1.25 Digital Video
1.27 Integration: Voice, Video, Data
Chapter 2 Transmission Systems
2.03 Time Division Multiplexing
2.05 T1 Carrier System
2.07 T1 Basics: Multiplexers
2.09 Framing and Channels
2.11 Pulses and Repeaters
2.13 How T1 is Provided
2.15 Fibers and Cables
2.17 SONET and DWDM: Core Networks
2.19 International Digital Hierarchies

V3: Fundamentals of Datacom and Networking
Part 1 Introduction to Data Communications and Networking
1.03 Data Circuit Model
1.05 Data Terminal Equipment (DTE)
1.07 Analog and Digital Data Circuits
1.09 Data Circuit Terminating Equipment (DCE)
1.11 Configuration Example: Point-to-Point
1.13 Multidrop Circuits
1.15 LANs
1.17 Wide Area Networks
Part 2 How Data is Formatted for Transmission
2.03 Data Communications Basics: Bits and Bytes
2.05 ASCII Code Set
2.07 "Asynchronous"
2.09 Frames
2.11 Details for Reference: Cyclic Redundancy Check
2.13 Packets
2.15 Packets vs. Frames
2.17 IP Packets
Part 3 The Network ?Cloud?: How Data Circuits are Actually Provisioned
3.03 Anatomy of a Digital Circuit
3.05 Common Carriers' Transmission Networks
3.07 Network Equipment: How and Where Each is Used

Understanding Networking 2
Part 1 Understanding The Internet
1.03 Internet History
1.05 Internet Basics
1.07 TCP and UDP
1.09 Internet Service Provides
1.11 Commonly Used Internet Protocols
1.13 Domain Name System
1.15 MIME and Base-64 Encoding
1.17 World Wide Web
1.19 HTML, HTTP and HTTPS
1.21 Accessing the Internet: Home Connections
1.23 Accessing the Internet: Organization Connections
Part 2 IP Security
2.03 Risk, Measures and Policy
2.05 Viruses
2.07 Trojan Horses, Denial of Service Attacks, Spyware and Exploits
2.09 Network Segmentation and Perimeters
2.11 Packet Filtering
2.13 Firewall Proxies
2.15 Stateful Packet Inspection
2.17 Encryption
2.19 Authentication
2.21 IPsec
2.23 Customer-Premise-Based VPN
2.25 Carrier VPNs