When using a passive injector for PoE, what element is primarily added to the transmission?

A passive injector for Power over Ethernet (PoE) primarily adds direct current (DC) voltage to the transmission. In PoE, the passive injector combines power and data on a single Ethernet cable, enabling devices like IP cameras or wireless access points to receive both data for network connectivity and electrical power efficiently without needing separate power sources.

Passive injectors operate by injecting power into the line without actively managing or converting the data signal, which remains unaffected. This is particularly important as it simplifies the deployment of networked devices that require power and data, allowing for easier installations and more versatile applications in networking environments.

While data packets are a fundamental part of network transmissions, a passive injector specifically does not modify or inject these packets—it simply carries them alongside the DC voltage it adds. Analog signals and signal amplification are also unrelated to the function of passive injectors, which focus solely on delivering power through the existing infrastructure without altering the nature of the data transmission.