Switching and Switch Control

Example of cell switching:
Distributed queue dual buss (DQDB)

Function

- transport units constant length

- access units access
info in the ring:

- know subscribers in access unit’s

subnets and route packets for them

- access protocol applies token ring

Properties

- distributed switching (Compare
to FDDI*)

- ATM compatible

- rates: 64 kb/s ... 45 Mb/s

- geographical limit up to 200 km

*FDDI: Fiber Distributed Data Interface

see: http://www.iol.unh.edu/training/fddi/htmls/

Transport Unit (same as in ATM)