Avaya C360 - Manual (Page 188)

Avaya C360 Power over Ethernet Features
188 Installation and Configuration Guide Avaya C360 Multilayer Stackable Switches, version 4.5
How the C360-PWR Switches Detect a Powered Device
The C360-PWR switches use the specific resistance powered device signature and PD
(powered device) connection verification to determine whether to supply power to a give port.
Figure 33 shows the process.
Figure 33: Powered Device Detection
Specific Resistance Signature (IEEE 802.3af)
The C360-PWR switches apply a low voltage to the power feed pairs and measures the current.
A resistance of 19k
Ω to 26.5kΩ is considered valid according to the IEEE standard; if a valid
signature is detected, power is supplied to the port.
PD Connected
Once power is provided to a port, it is checked periodically to see if a PD is still connected. If a
PD is disconnected from a powered port, then power is denied to the port.
Start Check
Apply Power
Yes
No
No
Yes
PD still
connected?
Valid
Resistance
Signature?