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Yealink IP phones support the IEEE 802.3af standard for PoE devices and are compatible with any devices implementing this standard.

Model PoE Class (IEEE802.3af)
Standby(W) Max(W)
T19(P) E2     1.2   1.8    CLASS2
T21(P) E2     1.3    1.8    CLASS2
T23G     1.0    2.2    CLASS1
T27G     1.7    7.0    CLASS3
T29G     2.1    5.7    CLASS0
T40P     1.4    3.2    CLASS2
T40G     1.1    1.6    CLASS2
T41S     1.7    3.8    CLASS2
T42S     2.5    4.7    CLASS2
T46S     4.0    2.7    CLASS2
T48S     3.2    7.5    CLASS3
T53W     1.8     3.1    CLASS2
T54W     2.2     5.5    CLASS3
T56A     2.3     6.0    CLASS3
T58A     2.3     6.0    CLASS3
T58V     2.6     7.4    CLASS3