Fiber Distribution Hub

3. General Requirements

3.1 Design Principles

• The backboard connectivity solutions shall be designed as customer-configurable distribution platforms, suitable for installation in street cabinets and other outdoor or indoor cabinet environments.

• The design shall facilitate efficient routing, management, and termination of incoming and outgoing fiber optic cables, as well as blown fibers (where applicable).

• For FDH configurations incorporating fiber optic splitters, the design shall provide dedicated, protected mounting positions for splitters and ensure proper fiber routing between input, splitter, and output ports.

• All components shall be constructed with materials resistant to environmental factors such as moisture, dust, temperature variations, and UV radiation (for outdoor applications) in accordance with Telecordia GR-63-CORE.

3.2 Mechanical Requirements

• The backboard structure shall have a minimum load-bearing capacity to support the maximum intended number of fiber optic connectors, splice trays, splitters, and associated cabling, without deformation or structural failure.

• Mounting points for the backboard within the cabinet shall comply with standard cabinet mounting hole patterns or provide adaptable mounting brackets to ensure compatibility with a wide range of cabinet types.

• All edges and surfaces shall be free of sharp burrs or projections to prevent damage to fiber cables or injury to installation personnel.

• The overall dimensions of the backboard shall be optimized for space efficiency within standard cabinets, while allowing sufficient access for installation, maintenance, and reconfiguration.

3.3 Environmental Performance

• Operating Temperature Range: -40°C to +65°C (in compliance with Telecordia GR-63-CORE Class 4 for outdoor applications)

• Storage Temperature Range: -40°C to +85°C

• Relative Humidity: 5% to 100% (non-condensing)

• Ingress Protection: Minimum IP54 rating (per IEC 60529) for components exposed to external environments

• Resistance to UV Radiation: Compliant with IEC 60068-2-5 Xenon arc testing requirements

4. Optical Performance Requirements

4.1 Fiber Compatibility

• The solutions shall support both single-mode (SM) and multi-mode (MM) optical fibers, in accordance with IEC 60793-2 Series.

• Single-mode fiber compatibility: ITU-T G.652.D, G.657.A1, G.657.A2, G.657.B3

• Multi-mode fiber compatibility: IEC 60793-2-10 OM3, OM4

4.2 Insertion Loss and Return Loss

• For fiber optic connector interfaces integrated into the backboard:

￮ Insertion Loss (IL): ≤ 0.3 dB (maximum) for single-mode fibers; ≤ 0.2 dB (maximum) for multi-mode fibers (per IEC 61300-3-3)

￮ Return Loss (RL): ≥ 50 dB (minimum) for single-mode fibers; ≥ 35 dB (minimum) for multi-mode fibers (per Telecordia GR-1209-CORE)

• For fiber optic splitters (when integrated):

￮ Insertion Loss: Shall comply with the applicable splitter ratio requirements specified in IEC 61753-1 and Telecordia GR-1221-CORE, with maximum IL values as defined for the specific splitter configuration (e.g., 1x8, 1x16, 1x32).

￮ Uniformity of Split: ≤ 0.8 dB (maximum) for all output ports of the splitter.

￮ Return Loss: ≥ 50 dB (minimum) for input and output ports (single-mode).

4.3 Fiber Protection

• All fiber routing paths on the backboard shall provide sufficient bend radius protection, with a minimum bend radius of 10 mm for single-mode fibers and 15 mm for multi-mode fibers (during installation) and 7.5 mm for single-mode fibers and 10 mm for multi-mode fibers (in final position), in compliance with IEC 60793-1.

• Splice trays (if included) shall provide environmental protection for fiber splices, with splice loss performance meeting IEC 61300-3-4 requirements (maximum splice loss ≤ 0.1 dB for single-mode, ≤ 0.2 dB for multi-mode).

5. Compliance and Testing

5.1 Compliance Verification

• All components of the backboard connectivity solution shall be tested and verified to comply with the requirements of the referenced IEC and Telecordia standards.

• A compliance certificate shall be provided for each product type, documenting the results of all applicable tests.

5.2 Test Methods

• Mechanical Testing:

￮ Load-bearing test: Apply 1.5 times the maximum intended load to the backboard for 24 hours, verify no permanent deformation.

￮ Vibration test: Comply with IEC 60068-2-6, 10 Hz to 500 Hz, 10 g acceleration (peak) for 2 hours per axis.

• Environmental Testing:

￮ Temperature cycling: IEC 60068-2-14, -40°C to +65°C, 10 cycles, 1 hour dwell time at each extreme.

￮ Humidity testing: IEC 60068-2-3, 93% relative humidity, +40°C, 10 days.

￮ UV exposure: IEC 60068-2-5, 1000 hours, xenon arc lamp.

• Optical Testing:

￮ Insertion loss and return loss: IEC 61300-3-3, using an optical power meter and light source (single-mode: 1310 nm, 1550 nm; multi-mode: 850 nm, 1300 nm).

￮ Splitter performance: IEC 61753-1, using a swept-wavelength interferometer or optical spectrum analyzer.

6. Marking and Documentation

6.1 Marking

• Each backboard and major component shall be marked with the following information (excluding customer-specific part numbers or trade names):

￮ Compliance symbols for IEC and Telecordia standards (e.g., "IEC 61300 Compliant", "Telecordia GR-1221 Compliant")

￮ Environmental rating (e.g., "IP54", "-40°C to +65°C")

￮ Fiber type compatibility (e.g., "SM G.652/G.657", "MM OM3/OM4")

￮ Manufacturing date (year and month)

￮ Serial number (unique identifier)

6.2 Documentation

• The following documentation shall be provided with each delivery:

￮ Technical data sheet, including dimensions, weight, optical performance specifications, and environmental ratings.

￮ Installation manual, providing step-by-step instructions for mounting the backboard, routing cables, and terminating fibers.

￮ Compliance certificate, verifying adherence to the requirements of this specification and referenced standards.

￮ Maintenance guidelines, including recommended inspection intervals and cleaning procedures for fiber optic interfaces.

7. Quality Assurance

• The manufacturing process shall be in accordance with ISO 9001 quality management system requirements.

• A quality control plan shall be implemented, including incoming inspection of raw materials, in-process testing of components, and final inspection of finished products.

• All products shall be subjected to 100% optical performance testing prior to shipment.

• A warranty period of at least 5 years shall be provided, covering defects in materials and workmanship under normal operating conditions.