How do I determine if the IP phones that receive inline power use the Cisco pre-standard PoE version or the IEEE 802.3af standard?
A. Cisco Standards based Power over Ethernet supplies power to Cisco IP phones, Cisco Wireless access points and any third party IEEE 802.3af standard compliance powered devices (PDs) with the same Ethernet cable that carries the data. Cisco Catalyst 3750 and 3560 Power over Ethernet supports both the Cisco pre-standard Power over Ethernet implementation as well as the IEEE 802.3af Power over Ethernet implementation. This ensures backward and forward compatibility and investment protection. The Catalyst 3750/3560 PoE switches support both the Cisco pre-standard Power over Ethernet, and the Standards based Power over Ethernet methods of PD detection. Both detection methods are active at the same time, and either one can be used in order to detect a valid PD. The Catalyst 3750/3560 PoE switches periodically check all ports, powered and non-powered, in order to check their status and the power status of connected devices. Cisco Catalyst 3750/3560 PoE switches support Cisco pre-standard PD
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