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Session 13

Session 13. Objectives: By the end of this session, the student will be able to: Identify the basic elements of a telephone system, and discuss the limitations of telephone signals

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Session 13

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  1. Session 13

  2. Objectives: By the end of this session, the student will be able to: • Identify the basic elements of a telephone system, and discuss the limitations of telephone signals • Describe the difference between a local exchange carrier and an interexchange carrier, and list the services each offers • List the types of leased lines that are available and their basic characteristics • Outline the features of ISDN, and distinguish a basic rate interface from a primary rate interface • List the basic characteristics of frame relay, such as permanent virtual circuits, committed information rate, and switched virtual circuits • Identify the main characteristics of Asynchronous Transfer Mode, including the roles of the virtual path connection and the virtual channel connection, the importance of the classes of services available, and ATM's advantages and disadvantages • Identify the main characteristics of digital subscriber line, and recognize the difference between a symmetric system and an asymmetric system

  3. Terminology POTS – Plain Old Telephone System Local Exchange Carriers (LECs) Interexchange Carriers (IECs or IXCs) Centrex (Central office exchange service) Private Branch Exchange (PBX) Private Lines Tie lines 3

  4. Local Loop 4

  5. Telephone Number 5

  6. Telephone Signals 6

  7. ISDN Channel Types 7

  8. Frame Relay 8

  9. PVC 9

  10. Leased Line Setup 10

  11. Frame Relay Line Setup 11

  12. SVC Connection Establishment SENDER NETWORK DESTINATION SETUP message (destination address+) CALL PROCEEDING msg (data link call identifier) CONNECT DISCONNECT DISCONNECT RELEASE RELEASE COMPLETE RELEASE COMPLETE Only one side is responsible for the DISCONNECT message 12

  13. ATM Cell 13

  14. DSL 14

  15. ISDN / Frame Relay / ATM / DSL / Cable Modems 15

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