Coaxial cable or transmission medium classification system, circuit and method

摘要

Remote devices are classified or identified as devices configured to be powered by power injected onto a transmission medium such as a coaxial cable. From a local position, local classification circuitry applies a first low voltage DC signal to the transmission medium. Energy from the first DC signal is received by remote classification circuitry at the remote position of a remote device, and stored within an energy storage component. Using the stored energy, the remote classification circuitry generates a digital classification signal on the coax cable or transmission medium. Upon receipt of the digital classification signal at the local end, the local classification circuitry responsively applies a second higher voltage DC signal to the transmission medium. The second DC signal is received at the remote end and used in providing power to the remote device.

主权项

1. A method of classifying and interacting with remotely located equipment coupled to a transmission medium through a media converter, the method comprising:
applying from a local position a first direct current (DC) signal to a transmission medium extending from the local position to a remote position of the remotely located equipment, the first DC signal being a low voltage and current limited signal having a first voltage; receiving the first DC signal over the transmission medium at the remote position and storing energy from the first DC signal in an energy storage component; generating a digital classification signal on the transmission medium, at the remote position, using a classification pulse generating circuit powered by the energy stored from the first DC signal, the digital classification signal identifying that the remotely located equipment is configured to operate as a powered device receiving power over the transmission medium; receiving the digital classification signal at the local position and responsively applying from the local position a second DC signal to the transmission medium, the second DC signal having a second voltage, higher than the first voltage; receiving the second DC signal over the transmission medium at the remote position and providing power from the second DC signal to the remotely located equipment.