ABSTRACT: An Optical Network Unit (ONU) transforms incoming optical signals into electronics at a customer's premises. An ONU closure is a mechanical compartment that houses the ONU equipment. An ONU system consists of a closure that is a metallic or non-metallic enclosure that provides physical and environmental protection for the active electronic, optoelectronics, and passive optical components it houses.

This document sets forth the Telcordia view of the generic requirements and characteristics required for ONU closures and systems. It is the Telcordia view that these generic requirements be met in order to meet the needs of a typical Service Provider.

This document provides criteria for analyzing ONU closures and systems used in a variety of Outside Plant (OSP) environments and applications, including those used in building entrance facilities. It includes functional design criteria, generic mechanical and environmental requirements, desired features, and the performance tests used for comparing ONU closures and systems with the stated requirements.

The performance tests for analyzing ONU closures and systems are intended to reflect a composite picture of standard installation and operating conditions.

This new issue of GR-950 is completely re-vamped and updated, and covers all the newest developments in ONU closure and system technology.

The All New Issue 3 contains:

• An analysis of ONU closures now used in a variety of OSP environments and applications, including those used in building entrance facilities
• Harmonization with the variety of Telcordia GRs and other standards documents
• All new test procedures and criteria for numerous scenarios and environmental conditions
• Covers the latest in Electrical Safety, Bonding and Grounding, and Telecommunications Surge Protection areas.