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Chapter 2

Chapter 2. Communications Systems Modeling. Introduction Example: a diplomatic negotiation Principles of a layered model Connection oriented and connectionless communications Communication networks according to a layered model. Contents. Introduction Example: a diplomatic negotiation

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Chapter 2

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  1. Chapter 2 Communications Systems Modeling

  2. Introduction Example: a diplomatic negotiation Principles of a layered model Connection oriented and connectionless communications Communication networks according to a layered model Contents

  3. Introduction Example: a diplomatic negotiation Principles of a layered model Connection oriented and connectionless communications Communication networks according to a layered model Contents

  4. The problem: Complexity of networked systems The solution: Decomposition into independent subsystems Layered network model Introduced by IBM (SNA, 1971) Standardized by ITU (X200) and ISO (7498) Method universally adopted Standards not really obeyed in practice Layered Network Models

  5. Introduction Example: a diplomatic negotiation Principles of a layered model Connection oriented and connectionless communications Communication networks according to a layered model Contents

  6. A diplomatic negotiation Political arguments Service Access Points Translation Cryptography Transmission

  7. A diplomatic negotiation Political arguments Service Access Points Single language messages Cryptography Transmission

  8. A diplomatic negotiation Political arguments Service Access Points Single language messages Encrypted messages Transmission

  9. A diplomatic negotiation Political arguments Service Access Points Single language messages Encrypted messages Electromagnetic waves

  10. Introduction Example: a diplomatic negotiation Principles of a layered model Connection oriented and connectionless communications Communication networks according to a layered model Contents

  11. Layered Model Definitions Level (n+1) entity Level (n+1) entity Virtual level n+1 communication path using a level n+1 protocol Physical Communication Path Level n Service Access Points Level (n) entity Level (n) entity Virtual level n communication path using a level n protocol Level n Addresses Level (n-1) Service Provider

  12. Layered Model DefinitionsExample: The Telephone Service Virtual Interpersonal communication path Physical Communication Path Telephone Service Access Points Telephone Numbers Telephone Network

  13. Layered Model DefinitionsProtocol Data Units (n+1)PDU Level (n+1) entity Level (n+1) entity PDUencapsulation (n)PDU Level (n) entity Level (n) entity Level (n-1) Service Provider

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