Verification of cable application and reduced load cable removal in power over communications systems
In one embodiment, a method includes identifying insertion of a plug at a port of power sourcing equipment for delivery of Power over Ethernet, the plug connected to one end of a cable with another plug connected to an opposite end of the cable, checking for resistors at each of the plugs, determining a power rating of the cable based on the resistors located at the plugs, and powering the port to a power level based on the power rating. An apparatus is also disclosed herein.
1. A method for verifying operation of a cable for Power over Ethernet applications, comprising:
identifying insertion of a plug at a port of power sourcing equipment for delivery of Power over Ethernet, the plug connected to one end of a cable with another plug connected to an opposite end of the cable;
checking for resistors at each of the plugs;
determining a power rating of the cable based on the resistors located at the plugs; and
powering the port to a power level based on said power rating.
2. The method of claim 1 wherein powering the port comprises powering the port to provide at least 100 watts power to a powered device.
3. The method of claim 1 wherein checking for resistors at each of the plugs comprises checking for matching resistors at each of the plugs.
4. The method of claim 1 wherein checking for resistors comprises checking for resistors in each pair of a four-pair cable.
5. The method of claim 1 wherein no resistor is found in at least one of the plugs and powering the port comprises powering the port to a maximum of 90 watts.
6. The method of claim 1 further comprising monitoring a temperature of the cable and reducing said power level if said temperature exceeds a specified limit.