Models for Service Differentiation

• Shared Medium

  • The airplane model
    • Economy vs Business Class
      • This is the most common model in packet networks
    • Single physical cable with virtual pipes

• Non shared medium

  • The restaurant model
    • Cheap vs expensive restaurants
      • uncommon in data networks
    • several physical media going to the same destination
      • 56kbps PPP vs 10mbps Ethernet, voice trunks in circuit switching