A fiber optic cold connector should be connected to the optical device or patch panel where the fiber terminates, such as an OLT, ONT, distribution box, or customer premises drop cable.

Connection Points and Usage

Fiber optic cold connectors, also known as mechanical splices or fast connectors, are designed for field termination without requiring a fusion splicer. They are typically used in FTTH (Fiber to the Home) deployments, emergency repairs, or small-scale installations . The connector aligns the bare fiber with a short fiber stub inside the connector body using index-matching gel or mechanical clamping, allowing optical signals to pass through with minimal loss .

Common Connection Locations

1. Customer Premises (Drop Cable Termination): Cold connectors are often installed at the end of a drop cable to connect directly to an ONT (Optical Network Terminal) or other customer equipment .
2. Distribution Boxes: They can be used to terminate fibers inside distribution boxes, enabling quick patching or restoration without fusion splicing .
3. Patch Panels: In some cases, cold connectors are plugged into fiber patch panels to facilitate flexible network reconfiguration or temporary connections .

Important Considerations

• Connector Type Compatibility: Ensure the connector type (e.g., SC/APC or SC/UPC) matches the adapter or device port. APC and UPC types are not interchangeable, as mismatching can cause excess insertion loss and damage ferrule endfaces .
• Insertion and Return Loss: High-quality cold connectors typically have insertion loss ≤0.5dB and return loss ≥50dB (UPC) or ≥60dB (APC), which is critical for maintaining network performance .
• Fiber Type: Confirm compatibility with the fiber type (e.g., G.652D or G.657A) and cable diameter (2mm or 3mm) to ensure proper alignment and minimal signal loss .
• Field Installation: Cold connectors are ideal for quick field installation, requiring minimal tools and no power source, making them suitable for remote or emergency scenarios .

In summary, a fiber optic cold connector should be connected wherever the fiber terminates and requires a quick, reliable connection—commonly at customer premises, distribution boxes, or patch panels—while ensuring proper type matching and alignment to maintain network stability and low optical loss.