Diver down flag. A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed.
Familiarize yourself with some friendly network cables and take a closer look at common types of network media, including twisted-pair cable, coaxial cable, fiber-optic cable, and wireless.
Fiber cables come in many different shapes and sizes with a myriad of connector types. The most common form of fiber optic cable in use today is a multi-mode fiber cable (MMF) with a 62.5 micron fiber optic core.This is the form of cabling that is most used by fiber equipment manufacturers today.ong hauls of a thousand feet or more between buildings or LANs. This is an excellent solution for school or university networking as well as governmental and business campus environments. Fiber is usually used as a backbone between hubs that branch off to workgroups with hubs and twisted-pair cabling.