between building communication (laser, infra-red)
long-haul telecommunication (microwave radio with antennas -> 100 km)
no cables, digging, (eg 100 km trench)
cheap
laser & infra-red immune to tapping/jamming
no maintainance of transmission medium!
affected by rain/fog/thunderstorms
| Previous slide | Next slide | Back to first slide | View graphic version |