This Specification applies to Class IV single-mode optical fibers with glass core and cladding. Class IV fibers are used in telecommunication and data links with high bit-rate-times-distance products. This Sectional Specification is intended for use with Basic Specification EIA-455, "Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Connectors, and Terminating Devices," Generic Specification EIA-4920000-A, and Blank Detail Specifications.