Conversion between Protocols
Both requires conversion from/to Ethernet frames
FDDI uses translation
- Remove Ethernet frame; replace it with FDDI frame
- Decreases efficiency 10-20%
- Actual total effective rate of FDDI ? 70 Mbps
ATM uses encapsulation
- Segment and surround Ethernet frames with ATM cell headers ? Generally faster
- MAC Addresses must be translated to VC Identifiers and VC management ? 30-40% decreased efficiency
- Actual total effective rate of ATM ? 80 Mbps each direction (160 Mbps total)