How is the maximum distance for a PoE connection determined?

The maximum distance for a Power over Ethernet (PoE) connection is determined by the standards for Ethernet cabling and the operational requirements for delivering power alongside data over the same cable. The correct maximum distance of 100 meters includes both the length of the cable run as well as any additional losses that may be introduced by connectors and terminations.

Ethernet standards, specifically IEEE 802.3, specify that the total length of a horizontal cabling segment should not exceed 100 meters. This distance is critical because it ensures that the signal integrity is maintained, allowing devices to communicate effectively without loss of data or power. Beyond 100 meters, the electrical characteristics of the cable start to degrade, which can lead to issues such as increased latency, diminished power delivery, and potential data transmission errors.

Understanding this maximum distance is particularly important for installations utilizing PoE technology, as both power and data rely on maintaining a strong signal throughout the entire length of the cable. Therefore, proper planning and adherence to this maximum distance are vital for ensuring reliable operation of PoE devices, like security cameras, phones, or wireless access points.