Power Over Ethernet
Issue 2 July 2005 199
Figure 30: 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 19kΩ 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.
“Plug and Play" Operation
You can add and remove powered devices without manually reconfiguring the switch, since it
performs a periodic automatic load detection scan on non-powered ports.
● If a powered device that fits the above criteria is detected on a non-powered port, then
power is applied to the port.
Start Check
Apply Power
Yes
No
No
Yes
PD still
connected?
Valid
Resistance
Signature?
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