Patent application number | Description | Published |
20080291039 | Detection of a broken wire between power sourcing equipment and a powered device - A system and method for detecting a broken wire in a communication cable coupling a powered device to power sourcing equipment. Powered Devices (PDs) may be powered by power sourcing equipment via communication cables as in power over Ethernet systems. A current share technique is employed at the Power Sourcing Equipment (PSE) side or the PD side of the Ethernet cable to force currents in twisted pairs of the communication cable to be equal. In one embodiment, first and second power supplies within a PSE are coupled to first and second powered device controllers (PDCs). A characteristic within the system that is indicative of first and second PDC input voltages is measured and the two measured characteristics are compared. If the two measured characteristics are not substantially the same, such indicates the presence of a broken wire. In another embodiment, a broken wire is detectable as an imbalance in voltage drops across resistors disposed in series with wires of a twisted pair at either the PSE or PD end of the twisted pair. | 11-27-2008 |
20090033345 | System and method for characterizing a load at the end of a cable - Apparatus within power sourcing equipment and a method for determining whether a load within a powered device coupled to the power sourcing equipment via a cable is within an acceptable resistance range. If the load is within the acceptable resistance range, a voltage source is coupled to the load. In one embodiment one recharge interval is employed during which a capacitor is charged based, at least in part, on the voltage drop across the load and one discharge interval is employed during which a capacitor is discharged based, at least in part, on the voltage drop across the load. In a second embodiment, first and second recharge and discharge intervals are employed and prior to initiation of the recharge and discharge intervals, settling time periods are provided. | 02-05-2009 |
20110154086 | SYSTEM AND METHOD FOR DETECTING DISCONNECTION OF A DEVICE - A detection system to detect disconnection of a powered device from a link of a power over Ethernet system is disclosed. The detection system can include closed-loop control configured to supply a predetermined test current to an electrically conductive path that includes at least a portion of the link via which the powered device is connectable for receiving power. A detector is configured to monitor the closed-loop control, the loop detector providing a disconnect signal if the closed-loop control is outside of expected operating parameters, thereby indicating that the powered device has been disconnected from the link. | 06-23-2011 |
20120119696 | Devices And Methods For Detecting USB Devices Attached To A USB Charging Port - Methods and devices for detecting USB devices attached to a USB charging port are disclosed. The USB charging port includes a USB port having a first data line D+, a second data line D−, and a power line. A method includes attaching the USB device to the USB port; applying power to the USB device by way of the power line; applying a first voltage to the line D+ at the USB port by way of a first impedance; applying a second voltage to the line D− at the USB port by way of a second impedance. The voltages on the line D+ and the line D− are then monitored at the USB port. If the voltage on the line D+ is approximately equal to a first predetermined value for a predetermined period and the voltage on the line D− is below a second predetermined value, then the USB device is determined to be of an alpha type device. | 05-17-2012 |
20120237036 | COMMUNICATING SCRAMBLING SEED INFORMATION - A method of communicating scrambling seed information includes obtaining raw data to be transmitted using a processor, and generating scrambled data from the raw data according to a scrambling seed. A scrambled data packet structure is configured by combining a preamble portion, a synch portion, and a header portion to the scrambled data, wherein the header portion includes a scrambler field value including a plurality of bits (M). The scrambled data packet structure is transmitted to a receiver. The receiver receives the header portion including the scrambler field value. The receiver maps the scrambler field value to a scrambling seed, and decodes the scrambled data using the scrambling seed. | 09-20-2012 |
20130219195 | DEVICES AND METHODS FOR TRANSMITTING POWER OVER AN ETHERNET LINE - Circuits and methods for providing power from power sourcing equipment to a powered device using an ethernet cable are disclosed herein. An embodiment of the method includes detecting a resistance value in the powered device, wherein the resistance value determines whether the powered device can receive power. A first class event is performed to determine the class of the powered device. A second class event is then performed to determine the class of the powered device. Power is transmitted on all four pairs of the ethernet cable simultaneously when the first and second class events indicate that the class of the powered device conforms to a class that can receive power from the power sourcing equipment on all four pairs. | 08-22-2013 |
20150035365 | SYSTEM AND METHOD FOR CONTROLLING POWER DELIVERED TO A POWERED DEVICE THROUGH A COMMUNICATION CABLE - Power over Ethernet (PoE) communication systems, control circuits and methods are presented for controlling power delivered to a powered device through a communication cable, in which a power sourcing equipment measures a supply voltage and selectively discontinues provision of power from a power source in response to a measured supply current exceeding an adaptive limit signal representing a supply current level corresponding to a predetermined safe operating power level at the measured supply voltage. | 02-05-2015 |
20150042243 | POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM - One example includes a power-over-Ethernet (PoE) control system. The system includes a powered device (PD) that is configured to receive a voltage signal via an Ethernet connection and which comprises a PoE signal receiver configured to indicate a nominal power level via the received voltage signal. The system also includes a power sourcing equipment (PSE) device configured to generate the voltage signal and to measure a class current of the voltage signal to determine the nominal power level. The PSE device includes a PoE controller configured to provide a power setting command as a function of the nominal power level to the PoE signal receiver via the voltage signal, such that the PD can operate at a power level that is based on the power setting command. | 02-12-2015 |