Management of power-over-ethernet installation
The invention relates to a management unit ( 1 ) and a method for operating such a unit in a Power-over-Ethernet (PoE) installation. The management unit ( 1 ) comprises at least one first port ( 12 a ) to which an external device ( 2 ) can be connected, and it is adapted to control the power delivered at a first port ( 12 a ) in dependence on predetermined switching rules.
1. A management unit adapted to act as Power Sourcing Equipment for a PoE (Power-over-Ethernet) installation, comprising at least one first port to which lamps can be connected, wherein the at least one first port is a PoE connector, wherein the management unit is adapted to control the power delivered at a first port in dependence on predetermined switching rules, characterized in that the management unit further comprises at least one second port to which external controlling devices can be connected, wherein the at least one second port is a further PoE connector, wherein the management unit is adapted to control the power delivered to a lamp at the first port in dependence on the operational state of an external controlling device connected to a second port.
2. The management unit according to claim 1 , characterized in that the external controlling device comprises a switch.
3. The management unit according to claim 1 , characterized in that the external controlling device comprises a sensor.
4. The management unit according to claim 1 , characterized in that the management unit comprises a memory in which track is kept of lamps and connected external controlling devices.
5. The management unit according to claim 4 , characterized in that the memory stores characteristic parameters of the lamps and connected external controlling devices.
6. The management unit according to claim 1 , characterized in that the management unit can be put into a “power-low state” in which power consumption at at least one port is temporarily reduced.
7. The management unit according to claim 6 , characterized in that the management unit comprises a manual switch via which the power-low state can be initiated.
8. The management unit according to claim 1 , characterized in that the management unit is adapted to control the lamps connected to its ports such that a given maximally allowed sum of power is not exceeded.
9. The management unit according to claim 8 , characterized in that the value of the maximally allowed sum of power is communicated from a hierarchically higher unit of an IP network the management unit is connected to.
10. The management unit according to claim 1 , characterized in that the switching rules comprise a ranking of external devices with respect to their importance.
11. The management unit according to claim 1 , characterized in that the first and/or the second port is operated with a protocol that includes an identification procedure of newly connected lamps.
12. A method for operating a management unit adapted to act as Power Sourcing Equipment in a PoE installation, said management unit comprising at least one first port to which external devices can be connected, wherein the at least one first port is a PoE connector, wherein the power delivered at the first port is controlled in dependence on predetermined switching rules, characterized in that the management unit further comprises at least one second port to which external controlling devices can be connected, wherein the at least one second port is a further PoE connector, wherein the management unit is adapted to control the power delivered to a lamp at the first port in dependence on the operational state of an external controlling device connected to a second port.