Feeder fiber optic cable and trunk

Feeder cables connect the access node to distribution points, while trunk cables carry multiple fiber links over longer distances to aggregate traffic in a network.

Feeder Fiber Optic Cables

Feeder cables are fiber optic cables that run from the access node to the fiber distribution terminal. They serve as the main arteries of a fiber network, delivering high-capacity connections from central points to distribution hubs or neighborhood terminals . The number of fibers in a feeder cable depends on the network design and expected traffic load. These cables are typically designed for medium to long distances and are optimized for reliability and minimal signal loss. In FTTH (Fiber to the Home) systems, feeder cables act as the intermediate link between the central office and distribution cables that reach individual subscribers .

Trunk Fiber Optic Cables

Trunk cables, on the other hand, are high-capacity cables that aggregate multiple fiber links into a single physical conduit, enabling higher transmission speeds and improved network resiliency . They are often pre-assembled with connectors such as LC (Lucent Connector) or SC (Subscriber Connector) for quick installation and can be configured with different fiber counts, lengths, and types (OM1, OM2, OM3, OM4, OM5, or OS2) depending on the application . Trunk cables are commonly used in data centers, office buildings, campuses, and industrial networks, where multiple fiber connections need to be consolidated efficiently . They can be designed as loose tube, breakout, or microbreakout cables to suit indoor, outdoor, or universal applications.

Key Differences

• Function: Feeder cables transport fiber from the central node to distribution points; trunk cables aggregate multiple fibers for high-capacity backbone connections.
• Deployment: Feeder cables are often part of FTTH or local distribution networks; trunk cables are used in data centers, backbone networks, or long-distance aggregation.
• Structure: Trunk cables may have higher fiber counts and pre-terminated connectors for plug-and-play installation, while feeder cables focus on durability and flexibility for routing to distribution terminals.
• Connector Types: Trunk cables commonly use LC or SC connectors, while feeder cables may be spliced or terminated at distribution points depending on network design .

Summary

In a fiber optic network, feeder cables act as the main delivery lines from the access node, while trunk cables serve as high-capacity backbones that consolidate multiple fiber links. Both are essential for ensuring high-speed, reliable, and scalable network performance, with their design and deployment tailored to specific network requirements .