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Communications Systems Modeling

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... in Information Technology Module C1 p1 ... Connection oriented and connectionless communications ... using a level n protocol. Physical Communication Path ... – PowerPoint PPT presentation

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Title: Communications Systems Modeling


1
Chapter 2
  • Communications Systems Modeling

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

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

4
Layered Network Models
  • 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

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

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

11
Layered Model Definitions
Level (n1) entity
Level (n1) entity
Virtual level n1 communication path using a
level n1 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
(n1)PDU
Level (n1) entity
Level (n1) entity
PDU encapsulation
(n)PDU
Level (n) entity
Level (n) entity
Level (n-1) Service Provider
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