A technician is installing several IP security cameras that will receive power directly from an IEEE 802.3af-compliant PoE switch. To verify that each switch port can supply enough power, the technician needs to know the maximum power budget per port defined by the 802.3af (Type 1) standard at the power-sourcing equipment (PSE). What is the maximum power a single 802.3af port can supply?
IEEE 802.3af (PoE Type 1) allows a power-sourcing device such as a PoE switch or midspan injector to deliver up to 15.4 watts per port. Because of cable loss, only 12.95 W is guaranteed to reach the powered device, but the standard's maximum at the PSE is 15.4 W. Higher values (e.g., 30 W) belong to IEEE 802.3at (PoE+), while 90 W is defined by IEEE 802.3bt (Type 4). A figure as low as 7.5 W would not meet the 802.3af specification.
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