SMDS - Switched Multi-megabit Data Services (2)

• Media: SONET, DS-3, DS-1

• Topology: physically star configured network with dual bus design

• Limitations: up to 512 nodes on the bus;bus length: up to 160 km

• Connection to SMDS network:

  • LAN---Bridge/Router---CSU---(T1/T3)---SMDS network

• Main competitors: Frame Relay and ATM

• OSI Reference Model

  • SMDS service defines 3 layers (SIPs = SMDS Interface Protocols)
  • physical, data link and network layers

• SMDS is compatible with:

  • IEEE 802.6 Metropolitan Area Network, and Broadband ISDN
  • DQDB - Distributed Queue Dual Bus ; used as the interface and access method for the network

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