Which devices work as transmitter and receiver pairs for digital signal transmission over long distances?

Extenders are specifically designed to facilitate digital signal transmission over long distances by functioning as both transmitters and receivers. They address limitations in signal degradation that can occur over extended cabling runs, particularly with high-definition video and audio signals. By using extenders, signals can be sent over greater distances without loss of quality, making them essential in AV setups that require the transmission of high-resolution content across long distances.

In contrast, amplifiers are used to boost signal strength, which is important for maintaining quality but does not itself transmit a signal over long distances. Splitters distribute a single signal to multiple outputs but do not transmit signals over long distances themselves. Modulators convert signals into different formats for transmission but aren't primarily used for extending distances; instead, they focus on altering the signal type for specific transmission systems. Thus, extenders uniquely fulfill the need for both transmitting and receiving signals over long distances.