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Introduction to Packet Voice Technologies

Introduction to Packet Voice Technologies

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Introduction to Packet Voice Technologies

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  1. Introduction to Packet Voice Technologies Cisco Networking Academy Program

  2. Traditional Telephony

  3. Basic Components of a Telephony Network

  4. Central Office Switches

  5. What Is a PBX?

  6. Basic Call Setup

  7. Supervisory Signaling

  8. Tone telephone DTMF dialing Address Signaling • Rotary telephone • Pulse dialing

  9. Informational Signaling

  10. Digital vs. Analog Connections

  11. Time-Division Multiplexing

  12. Frequency-Division Multiplexing

  13. Packetized Telephony Networks

  14. Packet Telephony vs. Circuit-Switched Telephony • More efficient use of bandwidth and equipment • Lower transmission costs • Consolidated network expenses • Increased revenue from new services • Service innovation • Access to new communications devices • Flexible new pricing structures

  15. Call Control

  16. Distributed Call Control

  17. Centralized Call Control

  18. Packet Telephony Components

  19. Real-Time vs. Best-Effort Traffic • Real-time traffic needs guaranteed delay and timing. • IP networks are best-effort with no guarantees of delivery, delay, or timing. • Solution is quality of service end-to-end.

  20. Foreign Exchange Station Interface

  21. Foreign Exchange Office Interface

  22. E&M Interface

  23. T1 Interface

  24. E1 Interface

  25. BRI

  26. Physical Connectivity Options

  27. Cisco IP Phone

  28. Analog Voice Basics

  29. Local Loops

  30. Types of Local-Loop Signaling • Supervisory signaling • Address signaling • Informational Signaling

  31. On Hook

  32. Off Hook

  33. Ringing

  34. Ringing (Cont.)

  35. Pulse Dialing

  36. Dual Tone Multifrequency

  37. Informational Signaling with Call-Progress Indicators

  38. Trunks

  39. Foreign Exchange Trunks • Foreign Exchange Office • Connects directly to office equipment • Used to extend connections to another location • Foreign Exchange Station • Connects directly to station equipment • Used to provision local service

  40. Types of Trunk Signaling • Loop start • Ground start • E&M Wink Start • E&M immediate start • E&M delay start

  41. Loop-Start Signaling

  42. Ground-Start Signaling

  43. E&M Signaling • Separate signaling leads for each direction • E-lead (inbound direction) • M-lead (outbound direction) • Allows independent signaling

  44. E&M Type I

  45. E&M Type V

  46. E&M Type II

  47. E&M Type III

  48. E&M Type IV

  49. Trunk Supervisory Signaling—Wink Start

  50. Trunk Supervisory Signaling—Immediate Start