What are the first-level dimensions of an optical distribution box

The first-level dimensions of a typical optical distribution box are designed to accommodate fiber terminations, splices, and slack storage, with wall-mountable units generally ranging from compact sizes around 250–400 mm in height, 200–300 mm in width, and 80–150 mm in depth.OverviewAn optical distribution box (ODB), also known as a fiber distribution box or termination box, is a critical component in FTTx and FTTH networks. It serves to terminate, splice, and organize optical fibers while providing protection against environmental factors such as dust, moisture, and UV exposure . The box is typically made from high-strength engineering plastics or cold-rolled steel, offering durability and anti-aging properties .Typical First-Level DimensionsWhile exact dimensions vary by manufacturer and model, common first-level (overall) dimensions for wall-mounted optical distribution boxes are:Height: 250–400 mmWidth: 200–300 mmDepth: 80–150 mm These dimensions are sufficient to house splice trays, fiber slack storage, and splitter modules, while allowing easy access for maintenance and cable management . Larger boxes may support 24 to 288 fiber cores, with modular trays mounted independently to prevent interference between live fibers .Design ConsiderationsInternal Layout: Includes splice trays, buffer storage areas, and routing paths to prevent fiber bending or stress .Mounting: Wall-mountable with 4-point mounting holes; some models support indoor and outdoor applications .Protection: Doors with secure latches, anti-theft locks, and weather-resistant enclosures .Capacity: Supports direct terminations, branch splicing, and integration of passive optical splitters for multi-point service delivery .SummaryThe first-level dimensions of an optical distribution box are primarily determined by the need to accommodate fiber management components, ensure accessibility, and provide environmental protection. Standard wall-mounted units typically measure 250–400 mm in height, 200–300 mm in width, and 80–150 mm in depth, with internal modular designs to support various fiber capacities and network configurations .