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Connecting non PoE devices such as PC to PoE switches
Hello Experts,
Just wanted to confirm if I can use any cisco PoE switch viz. one of the SG350 series model etc. to connect to my PC in my LAN . Will using a non poe device such as PC to PoE switch cause any harm or will it impact performance or any other parameter ?
Appreciate your inputs and suggestions on this.
While we're not in a Cisco community here, I'm happy to confirm that PoE switches built to IEEE industry standards don't just apply power to the data lines. There is a handshake after plugging where the devices - the switch as a Power Sourcing Equipment (PSE) does communicate with the device plugged, a Powered Device (PD) - either by classification currents (resistors on the PD side) or by Ethernet Layer 2 LLDP (newer devices on higher classes typically). Thus connecting non-PoE "aware" devices to PoE switches is safe.
Be aware there are vendors and device makers still preferring some proprietary implementations and misleadingly talk of PoE.
Here a listing borrowed from the Netgear Web. Note the type definitions are always backward compatible.
There are 3 existing PoE standardsPoE (802.3af) Type 1:The original PoE standard provides 15.4W of power to the Ethernet port to be sent = 12.95W of delivered power at 100M distance from the switch.
PoE+(802.3at) Type 2:PoE+ effectively doubles the PoE power to the device by providing 30W of power to the Ethernet port to be sent = 25.5W of delivered power at 100M distance from the switch.
PoE++(802.3bt) Type 3 and 4:PoE++ (bt) now effectivel doubles the PoE+ power to the device by providing 60W (Type 3) or 90W (Type 4) of power not only to the Ethernet port to be sent, but all the way to the device (if cable length is known) at 100M distance from the switch. Minimum delivered power at 100M is 51W (Type 3) and 71W (Type 4) respectively.
For more details -> https://en.wikipedia.org/wiki/Power_over_Ethernet
1 Reply
While we're not in a Cisco community here, I'm happy to confirm that PoE switches built to IEEE industry standards don't just apply power to the data lines. There is a handshake after plugging where the devices - the switch as a Power Sourcing Equipment (PSE) does communicate with the device plugged, a Powered Device (PD) - either by classification currents (resistors on the PD side) or by Ethernet Layer 2 LLDP (newer devices on higher classes typically). Thus connecting non-PoE "aware" devices to PoE switches is safe.
Be aware there are vendors and device makers still preferring some proprietary implementations and misleadingly talk of PoE.
Here a listing borrowed from the Netgear Web. Note the type definitions are always backward compatible.
There are 3 existing PoE standardsPoE (802.3af) Type 1:The original PoE standard provides 15.4W of power to the Ethernet port to be sent = 12.95W of delivered power at 100M distance from the switch.
PoE+(802.3at) Type 2:PoE+ effectively doubles the PoE power to the device by providing 30W of power to the Ethernet port to be sent = 25.5W of delivered power at 100M distance from the switch.
PoE++(802.3bt) Type 3 and 4:PoE++ (bt) now effectivel doubles the PoE+ power to the device by providing 60W (Type 3) or 90W (Type 4) of power not only to the Ethernet port to be sent, but all the way to the device (if cable length is known) at 100M distance from the switch. Minimum delivered power at 100M is 51W (Type 3) and 71W (Type 4) respectively.
For more details -> https://en.wikipedia.org/wiki/Power_over_Ethernet
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