The fiber optic cables installed within the red line represent the sections of the network that have been successfully deployed, typically using single-mode fiber for outdoor or long-distance applications.

Installed vs Planned Cables

In deployment diagrams, red lines indicate fiber optic cables that have been fully installed, while other colors, such as blue, may represent planned or incomplete sections awaiting future installation . This visual distinction helps technicians and planners track progress and prioritize future work.

Fiber Type Selection

The installed cables within the red line are usually single-mode fiber (OS2), which is preferred for outdoor applications and long-distance runs because it supports tens to hundreds of kilometers and offers virtually unlimited bandwidth . Multi-mode fiber (OM1–OM5) is generally reserved for shorter, indoor connections due to its lower cost but limited distance and speed capabilities.

Installation Considerations

Fiber installation within designated corridors or conduits follows industry standards to ensure reliability and longevity:

• Route Planning: Cables are installed along pre-approved paths, often within public rights-of-way, utility easements, or conduits .
• Mechanical Protection: Cables are pulled carefully to avoid sharp bends, excessive tension, or contact with sharp objects, and protective sheathing is maintained until installation is complete .
• Splicing and Testing: Sections of fiber are spliced in protective enclosures, and testing with tools like OTDRs ensures signal integrity before network activation .
• Future Expansion: Even when some sections are left uninstalled (blue lines), the network is designed to allow easy addition of fiber as demand grows .

Summary

The red line in fiber deployment diagrams marks the successfully installed fiber optic cables, typically single-mode for outdoor or long-distance use. These installations follow careful planning, protective handling, and testing procedures to ensure high performance and scalability for future network expansion .