Question: How many cells, octets, and bits can be present on a fiber that connects to an ATM switch if the fiber is 3 meters long? 100 meters? 3000 meters? To find out, consider an ATM switch transmitting data at 155 Mbps. Each bit is a pulse of light that lasts ll(155 x lo6) second. Assume the pulse travels at the speed of light, calculate its length, and compare to the length of the fiber.