Air is assumed to have a permeability of 1. Now called PC Cards. Because plastic optical fiber is less expensive than glass optical fiber, it is being designed to support fiber to the desktop. Plenum-rated cable does not give off toxic fumes when it burns. In coaxial RF connectors the plug is usually the movable portion, and is usually attached to a cable or removable assembly.
Plugs mate with receptacles, jacks, outlets, etc.
Compare with multipoint. The material most commonly used for the insulation and jacketing of cable. The type of plastic from which cable jackets and wire insulation are usually made. Produces toxic fumes when it burns. Compare with plenum rated.