Power over ethernet management devices and connection between ethernet devices
In one embodiment, a connection is maintained between a pair of ethernet ports that have circuitry connected in series with the ports and receiving power-over-ethernet (PoE) from one of the ports, by providing a controllable bypass circuit coupled to the pair of ethernet ports in parallel with the circuitry receiving power-over-ethernet, sensing a preselected condition, and opening and closing the bypass circuit in response to the presence or absence of the preselected condition. Power sourcing equipment (PSE) may supply the one of the ports with power over ethernet, and the circuitry may transports data between the pair of ethernet ports. The circuitry may also supply the switch with a control signal in response to the detection of the preselected condition.
1. A network powered device comprising:
a first network interface receiving power over the first network interface;
a second network interface;
a switch coupled between the first network interface and the second network interface, the switch having a bypass mode that couples power between the first interface to the second interface and a non-bypass mode that decouples power between the first interface from the second interface;
a circuit implementing functions of the device; and
a CPU coupled to the switch and controlling the state of the switch, the CPU executing diagnostic software to monitor for a fault condition in the operation of the circuit, the CPU in response to detecting a no-fault condition configuring the switch into the non-bypass mode, the CPU in response to detecting a fault condition in the operation of the circuit configuring the switch into the bypass mode, wherein the CPU is separate from the second network interface.
2. The network powered device of claim 1 wherein the second network interface provides a power source when the switch is in the bypass mode.
3. The network powered device of claim 2 wherein the first network interface comprises data lines and non-data lines and power is received on the data lines and the non-data lines.
4. The network powered device of claim 3 wherein the second network interface comprises data lines and non-data lines and only provides the power source after verifying that there is an external electrical load on the data lines and on the non-data lines of the second network interface.
5. A method for operating a network powered device comprising:
configuring a switch coupled between a first network interface and a second interface in a non-bypass mode when power is not being received over the first network interface;
in response to power being received over the first network interface, enabling a CPU to execute diagnostic software to monitor for a fault condition in the operation of a circuit implementing functions of the device;
in response to the CPU detecting a no-fault condition configuring the switch into a non-bypass mode, the non-bypass mode decoupling the first interface from the second interface and not provide power from the first interface to the second interface; and
in response to the CPU detecting a fault condition configuring the switch into the bypass mode coupling the first interface to the second interface to provide power from the first interface to the second interface, wherein the CPU is separate from the second network interface.
6. The method of claim 5 wherein the second network interface provides a power source when the switch is in the bypass mode.
7. The method of claim 6 wherein the first network interface comprises data lines and non-data lines and power is received on the data lines and the non-data lines.
8. The network powered device of claim 7 wherein the second network interface comprises data lines and non-data lines and only provides the power source after verifying that there is an external electrical load on the data lines and on the non-data lines of the second network interface.