It may not surprise you to hear this: In an ideal world, the fiber height of every connector fabricated anywhere in the world would be +/-0 nanometers. This means the fiber would be absolutely flush with the ceramic ferrule. The Fiber Optic Association, Inc. The charter of the FOA was to promote professionalism in fiber optics through education, certification, and. 4. FO-VC2 JOINT USE - VERICAL MIDSPAN CLEARANCES 48. FO-RI JOINT USE RISER. Fiber height is a critical geometry parameter (along with Radius, Angle/Apex, and Key Error), which directly impacts the optical performance of the connector in the fiber optic network. NEIS® are intended to be referenced in contrac documents for electrical construction ation or liability to users of this publication. Existence of a standard shall not preclude any member or nonmember of NECA or FOA from specifying or using. Some key considerations for installing optical fiber cable are highlighted below. Proper industry. The Fiber Optic Association T h e F iberO pti c Associat i o n FOA TM National Electrical Installation Standards™ T h e FiberO pti c Association FOA Standard for Installing and Testing Fiber Optics NECA/FOA 301-2016 An American National Standard Jointly developed with The Fiber Optic Association T.