Introduction
FDDI
- LAN technology that supports 100 Mbps rate.
- up to 500 communicating stations configured in a hub or ring topology.
- uses a timed-token access protocol.
ATM
- emerging technology for backbone support in high-speed networks.
- five different service categories: CBR, ABR, RT_VBR, NRT_VBR, and UBR.
- different applications require different QoS and therefore different service categories.
- channels do not have fixed bandwidths ? congestion in network ? cell loss.
- leaky bucket and dual leaky bucket are policing mechanisms for CBR and VBR traffic, respectively.