Qu'est-ce que « Dark fibre, lit service, wavelength service » ?

Dark fibre is fibre sold or leased without equipment: the buyer lights it with its own transponders and amplifiers and controls everything that affects latency. A lit service is capacity sold on the seller’s equipment: a circuit of a given speed between two points. A wavelength service is a lit service that dedicates one wavelength of the seller’s fibre system to the buyer.