Air-blown fiber optic cables typically use 24, 48, 96, or 144 cores, with the choice depending on network size, application, and future expansion needs.

Typical Core Counts

Air-blown fiber (ABF) systems are designed with modular micro-units, usually in multiples of 12 cores, allowing flexibility in deployment. Common core counts include:

• 24-core cables: Suitable for short access networks or indoor drops, connecting a few subscribers or small office floors .
• 48-core cables: Ideal for small FTTx deployments, campus buildings, or neighborhoods with 20–30 homes .
• 96-core cables: The most versatile option, often used for medium-sized networks or backbone connections .
• 144-core cables: Used for high-density backbone networks or large-scale metropolitan area networks .

Factors Influencing Core Selection

1. Current and Future Needs: Always plan for spare fibers to accommodate future expansion or replacement of damaged fibers .
2. Network Type: Short indoor drops may require fewer cores, while backbone or metropolitan networks need higher core counts .
3. Microduct Compatibility: The cable must fit the microduct size; overfilling can cause installation issues .
4. Flexibility and Cost: Air-blown systems allow fibers to be added or replaced later, reducing initial investment while maintaining scalability .

Practical Recommendation

For most installations, a 48-core or 96-core ABF cable provides a balance between cost, ease of installation, and future-proofing. Smaller networks can use 24-core cables, while large-scale deployments may require 144-core cables. Always consider the expected growth and potential new services when selecting the core count to avoid costly upgrades later .