The Telecommunications Industry Association (TIA) has published a new standard, TIA-604-16-B, entitled "Fiber Optic Connector Intermateability Standard -- Type LSH (FOCIS 16)." The document, a revision of TIA-604-16-A, presents the intermateability standard for simplex and duplex connectors with the commercial designation layer specification header (LSH).
According to the TIA, intermateability standards define the minimum physical attributes of mating connector components. Fully dimensioned components are not within the scope or intent of FOCIS 16. The requirements in the standard have been selected with the objective of ensuring that any combination of plugs and adapters conforming to the requirements of FOCIS 16 will mechanically intermate, and that intermated connector assemblies will meet a common level of performance.
TIA-604-16-B was created by TIA FO-4.3.2 Subcommittee on Interconnecting Devices, and released in January 2006. Copies of the document can be obtained here.