In a passive optical network (PON), what type of fiber-optic cable is used from the headend to the optical distribution network (ODN)?

In a passive optical network (PON), trunk cable is used from the headend to the optical distribution network (ODN) because it is designed to carry a high capacity of data over long distances. Trunk cables consist of multiple fibers packaged together, allowing for the efficient transmission of signals. They serve as the backbone of the network, ensuring that large amounts of data can be transported from the central office to different locations within the distribution network without significant loss or attenuation of signal.

The structure and capacity of trunk cables make them ideal for connecting the headend, where the main signal originates, to the ODN, where the signal is further distributed to end-users. This is crucial in a PON environment because it allows for the efficient allocation of bandwidth among multiple subscribers while maintaining optical integrity.

In contrast, drop cables are typically used for the final connection from the distribution point to individual premises, distribution cables connect within the ODN but do not serve as the primary link from the headend, and connectorized cables are designed for making specific connections rather than for use in high-capacity, long-distance links. Thus, the utilization of trunk cables is essential for maintaining network performance and reliability.