The Guardian device connected to a Dell Powerconnect 3524P or 3548P port did not stay linked up. The device comes up, and then it goes down, and then it comes up cycling.

If connected to a Linksys SRW208MP switch, the Guardian device stays up.

Pantel, Cisco, or Linksys PoE endpoints all work on the Dell Powerconnect 3524P.

A user tried hard coding the switch speed/duplex and tried four different Dell Powerconnect 3524P switches. — Check to make sure the Dell Powerconnect 3524P has flow control enabled on the port for the Guardian device to power up properly.