Basic HTML version of Foils prepared Dec. 6 98

Foil 57 ATM technology (4)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 ATM switch simply relays cells. It looks at the header and immediately begins forwarding the cell. Because all the cells are the same size, the delay is minimal. ATM switch performs its switching in hardware.No error checking is done. ATM assumes the use of high-quality, error free transmission facilities.
2 ATM Architecture: ATM was originally defined as part of B-ISDN, developed by CCITT in 1988. ATM Forum, created in 1991, has been working on development of ATM standards.
3 Physical Interface methods
  • UNI - User-to-Network Interface (interface between host and a switch); specifications UNI 3.0, UNI 3.1, UNI 4.0
  • NNI - Network-to-Network Interface (interface between switches)
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