équipement à portée optique

CONT: [One] option is to use line of sight transmission equipment. This type of equipment has a high transmission distance and little to no latency or interference, largely because it's designed for a point-to-point, line of sight transmission. ... line of sight equipment only provides good performance when there's nothing in the way of the devices to effect the transfer. ... Lose the line of sight and this equipment will still perform, albeit with a far lower range than the amount [one] can expect with a direct line of sight between the two devices.