scope:

This procedure defines the time domain method for measuring the information transmission capacity of EIA-4920000-A Class I (glass core, glass clad) optical fibers. Various methods of reporting the results are described in the appendices, but the results shall be expressed in terms of the -3 dB (optical power) frequency unless otherwise specified by the Detail Specification.

Note: This test method is commonly used in factories. It generally requires the use of extensive computational equipment. However, commercial equipment employing this technique exists. Refer to FOTP-30 for a comparable field test method.