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 Patch Cables. There are different types of fiber optic cable. Some types are single-mode, some types are multi-mode. Multi-mode cables can be found in OM1, OM2, OM3 and OM4 types. Each type has different properties. OM1 cable typically comes with an orange jacket and has a core size of 62.5 micrometers (Âµm).