Gigabit Ethernet
fibre with 1 Gb/s transmission rates
- near current limit of electroics/optical interface
light on/ off for 1/ 0, respectively
- 200 million meters / second
- 1 nanosecond per bit
- 0.2 meters per bit
for 200 meter station distance & 1,000 bit frame
- 200 meter frame = 1 microsecond, a = 1
- best utilization = Tf / (Tf + _) = 1/ (1+a) = 50%
- shorter frame or longer distance is worse
now have 10-100-1000 Mb/s = 100-10-1 nanosec/bit
- does support standard selectable scalability