Fiber jumpers (also called patch cords) usually have ____ fiber(s).

Fiber jumpers, commonly referred to as patch cords, typically consist of two fibers. This design allows for the establishment of a complete data transmission link, as one fiber is used for sending data while the other is utilized for receiving data. The bidirectional nature of fiber optic communication necessitates this two-fiber configuration, making it suitable for various applications, including telecommunications and data networking.

In contrast, other configurations with a different number of fibers would not align with standard implementations for most general uses. For instance, a single-fiber jumper would not support full-duplex communication, and jumpers with more than two fibers are generally utilized in more specialized applications, such as multi-channel systems or higher capacity formats where additional paths are required for simultaneous connections or redundancy.