Residential Community Optical Broadband Construction Process — Standard Specification Guide (Illustrated)

> Original Source: ruodian360.com (Chinese)

> Translation & Republish: English edition for international reference

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I. Optical Distribution Cabinet

1. Optical Distribution Cabinet Specifications

Front view of optical distribution cabinet:

Common specifications: 72, 144, 288, 432, 576 cores

Pedestal: 288–144 core ODF cabinet, (15 ± 2) cm, with external slope

2. Optical Distribution Cabinet Installation Procedure

Step 1: Site selection

Step 2: Cable conduit layout and embedded frame arrangement at pedestal

Step 3: Concrete pedestal installation

Step 4: Cabinet body installation

Step 5: Tray placement

Step 6: Storage and management of pre-terminated pigtails

Step 7: External cable introduction

Step 8: Fusion splicing of external cables to pigtails

Step 9: Route activation

3. Pedestal Pouring and Grounding

The installation and fixation of outdoor floor-standing jumper-free optical cable distribution cabinets mainly involves: laying of riser conduits and ground rods, concrete pedestal pouring, inner conduit installation, and cabinet mounting.

Grounding wire uses copper conductor of 16mm² or larger:

Two ground rods (on opposite sides), welded with 40×4 ground flat steel and driven into the ground:

4. Internal Optical Distribution Cabinet Key Points

5. Optical Distribution Cabinet Construction Requirements

1. The cabinet must be installed level and securely anchored.

2. Grounding must be reliable, with anti-corrosion, anti-rust, and acid-proof treatment. The ODF cabinet ground wire shall uniformly use 16mm² specification, with lug secured by screws.

3. The ceramic tiles at the cabinet base must be laid neatly and according to standard.

4. Fiber optic cable entries must be fixed in order from left to right. The strength member shall leave 10–15mm from the screw center point. Tape shall be uniformly black with consistent length. Where fixing is insufficient, use uniform black cable ties at the same horizontal plane—neat and consistent, with cut ends facing inward and trimmed flat.

5. Distribution cables in the integrated splice/distribution module shall be fusion-spliced from bottom to top, left to right.

6. Transition buffer tubes in the integrated splice/distribution module must not be coiled for more than half a turn. All fiber transition buffer tubes must maintain consistent curvature and be bundled together neatly.

7. Cable entry holes in the ODF cabinet must be sealed with firestop putty—neat and flush. Ensure waterproof and dustproof sealing; cable identification tags shall hang inside the pedestal.

8. Within the splice/distribution module (splice tray), fiber transition buffer tubes must be secured with small plastic cable ties.

9. After construction, clean the work site and the interior of the ODF cabinet. Dust caps must all be installed and of uniform color.

10. Panel labels on the ODF cabinet must be applied within three days of completion. Newly terminated positions must be annotated on the panel label after completion.

11. Fiber core attenuation must meet standards; non-compliant cores must be corrected and repaired on-site. Fiber identification (tone tracing) must be performed to ensure correct termination.

12. All cable entry holes in the ODF cabinet must be sealed with firestop putty.

13. Excess cable slack must not be coiled under the ODF cabinet. It must be pulled back into the manhole/handhole, properly coiled, and secured to the side.

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II. Fiber Distribution Terminal Box and Pathways

1. Fiber Distribution Box Site Selection

• Indoor installation: bottom of box/frame 1.2m–2.5m above floor level
• Outdoor installation: bottom of box/frame 2.8m–3.2m above ground level
• Shaft installation: bottom of box/frame 1.0m–1.5m above floor level (adjusted per site conditions)

Wall and location selection for fiber distribution box:

Direct-fusion fiber distribution boxes are used in corridors, cable shafts, etc., under a single-stage splitter architecture. They are primarily used for fusion splicing of feeder cables and drop butterfly cables. The box provides cable anchoring, butterfly cable fixation, and fiber storage positions, with stackable splice trays. Capacity: 24 or 48 cores. Installation locations shall follow design documents, typically choosing equipment rooms, garages, corridors, shafts, or hallways within buildings.

2. Fiber Distribution Box — Incoming Cables

3. Fiber Distribution Box — Incoming Cable Coiling Protection

4. Fiber Distribution Box — Internal Cable Arrangement

5. Fiber Distribution Box — Campus Cable Entry

6. Fiber Distribution Box — Campus Cable Entry (Alternate)

7. Fiber Distribution Box — Pigtail Routing Craftsmanship

8. Fiber Distribution Box — Internal Coding and Placement Order

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III. Optical Cable Laying

1. Duct Cable Requirements

Duct cables shall have intermediate manhole slack reserved as required by design.

Optical cables in manholes must be hung with identification tags specifying the cable specifications, type, purpose, and other details. Protective red conduit must be used where specified.

2. Aerial and Wall-Mounted Cable Requirements

3. Corridor Cabling

1. The fiber distribution box should be installed near the vertical riser pathway at a location convenient for maintenance.

2. For ease of subsequent cabling, the fiber distribution box should be installed on a middle floor.

3. The preferred location for the vertical riser is the landing near the residential unit door; the secondary option is the stair rest platform. After vertical pipe installation, repair all floor openings and repaint any stained walls.

4. PVC conduit is preferred for vertical risers, with a junction box installed on each floor. Plastic cable trunking is the secondary option.

5. Corrugated conduit is preferred for horizontal pathways; single-hole PVC conduit and plastic trunking are secondary. Exposed stapling of cables in corridors should only be used as a last resort.

4. Corridor Vertical Riser Installation

5. Crossing Horizontal Pipes — Flexible Protective Tube Method

a. Suitable when Ø32 multi-hole conduit is used and horizontal pipes need to be crossed.

b. The upper multi-hole conduit extends 5–10cm above the floor slab; the lower section is installed extending down to the horizontal pipe level (~2.65m). No junction box is installed between the upper and lower sections. The butterfly cable for the current floor diverges directly into the horizontal conduit. Butterfly cables for other floors cross the horizontal pipe with appropriate slack, protected by a protective tube.

6. Riser and Entrance Cable Laying

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IV. Fiber Optic Splice Closures

Fiber optic splice closures come in 2-in/2-out (most common), as well as 3-in/3-out and 4-in/4-out configurations.

2. Splice Closure Usage

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V. Labels and Tags

Label and tag production notes:

1. For urban residential areas with street numbers, the block number must be indicated in the location name — e.g., "Deyang Jingyang District Haitang Lane, Lots 15–20 Residential Area."

2. Only the character "栋" (Building) shall appear in equipment naming; "幢" or others are not permitted. No special symbols such as quotation marks. For locations with only a street number and no community name, specify down to "XX号小区" (Lot XX Residential Area). For "宿舍" (dormitory) or "家属区" (family quarters), no additional community name is needed.

3. Installation location must not be described as "1.5th floor" — standardize as "stairwell between 1F and 2F."

4. Label and tag content must include: project name, local end location, remote end location, and port occupancy information.