ABSTRACT:
GR-3125 outlines the Telcordia-NIS view of proposed generic requirements for Fiber Distribution Hubs (FDHs). The stated requirements are intended to provide a suitable environment for telecommunications companies¿ FDHs used in outside plant (outdoor or below-grade) or indoor environments.

Any equipment housed in an FDH is accessible to the craftsperson through surface-mounted or removable doors. An FDH is normally installed as a connection and demarcation point from different feeder networks, or between a feeder network and the distribution network. These FDHs are passive and do not contain active electronics or fiber optics.

For indoor environments, an FDH can be installed on a customer premise in a basement or ¿telephone room¿ or in a service provider Controlled Environmental Vault (CEV).

Indoor FDH products were previously covered in GR-3123-CORE, Generic Requirements for Indoor Fiber Distribution Hubs (FDHs), and below-ground FDH products were previously covered in GR-3121-CORE, Generic Requirements for Below-Grade Fiber Distribution Hubs (FDHs). The requirements in those GRs have now been incorporated into this GR-3125, and GR-3121 and GR-3123 have been cancelled.

GR-3125, Issue 2, was developed to include updated FDH requirements from the following documents:

• GR-487, Generic Requirements for Electronic Equipment Cabinets, Issue 5, March 2016
• GR-771-CORE, Generic Requirements for Fiber Optic Splice Closures, Issue 2, July 2008
• GR-449-CORE, Generic Requirements and Design Considerations for Fiber Distributing Frames, Issue 3, March 2012.