#802.3af

Powered Ethernet, or Power over Ethernet (PoE), has revolutionized how we power devices while simplifying network installations. One of the core standards enabling this innovation is IEEE 802.3af modules. These modules allow Ethernet cables to deliver both data and power, eliminating the need for separate power supplies for networked devices.

With the rise of smart devices, IP cameras, and wireless access points, IEEE 802.3af modules offer a seamless solution by providing up to 15.4W of power over standard Cat5 cables. This reduces the complexity of wiring and enhances flexibility in device placement. Whether you’re building a home office or expanding a corporate network, IEEE 802.3af modules ensure reliable performance and efficient power management.

Cisco 2802 radios is admin up, but down

I recently deployed Cisco 2802e (AIR-AP2802E-B-K9) access points in a warehouse. The facility was existing and had a couple PoE enabled Cisco 3750v2 switches. The 2802s powered up and registered to the new controller. After configuring the access points, the radios would not turn on.

I figured it had to be due to the 15.4w PoE on the 3750v2. I shut off the B/G radios in an attempt to free up…

Hooked up a bunch of Cisco Meraki MR34 to a HP Procurve zl5412 switch. They kept reporting ”PoE 802.3af (running in low power mode)”. The switch is capable of delivering over 30 watts per port, so PoE+ (802.3at) should’t be a problem.

Solution? Turns out just raising Maximum Watts to 33 don’t cut it. The Meraki starts using all them watts but still reports low power mode. One also has to enable PoE LLDP-MED (can be done via the Procurve switch web interface) to get Meraki running with full power.