Cisco Technology, Inc.

Craig Zimmerman

Sung Kee Baek

Manrique Brenes

Yen Teresa Nguyen

Rachel C Neal

Weizhong Tang

Robert Andrew Marshall

Charles Troper Yager

James William Edwards, Iii

Earl Boone

Matthew D Grimm

William C Johnson

James W Edwards

Gurinderjit Chahal

Chris Bullock

Daniel Nix

Aspects of the subject technology relate to a system and method for preventing voltage sagging using an Oring-FET in a redundant power supply configuration. Each redundant power supply includes an Oring-FET and a voltage comparator. The voltage comparator receives and compares an input voltage and an output voltage of the Oring-FET during power up. In the event input voltage is less than the output voltage, the Oring-FET is deemed to be operating properly and provides output to a communicatively coupled system bus in response to the input voltage reaching a predetermined voltage threshold level. In the event the input voltage is approximately equal to the output voltage, the voltage comparator assists in preventing inrush current from flowing from the communicatively coupled system bus and prevents voltage sagging on the communicatively coupled system bus when another redundant power supply configuration is providing power to the communicatively coupled system bus.

Method and system to prevent voltage sagging in a redundant power supply configuration

A system and method for preventing bus voltage sagging when an Oring-FET in an N+1 redundant power supply configuration is faulty during power up. Each redundant power supply includes an Oring-FET and a voltage comparator. The voltage comparator receives and compares an input voltage and an output voltage of the Oring-FET during power up. In the event input voltage is less than the output voltage, the Oring-FET is deemed to be operating properly and provides output to a communicatively coupled system bus in response to the input voltage reaching a predetermined voltage threshold level. In the event the input voltage is approximately equal to the output voltage, the voltage comparator assists in preventing inrush current from flowing from the communicatively coupled system bus and prevents voltage sagging on the communicatively coupled system bus when another redundant power supply configuration is providing power to the communicatively coupled system bus.

Method and system to prevent bus voltage sagging when an oring-FET in an N+1 redundant power supply configuration is faulty during power up

Adding a separate communication link between an intelligent midspan Power Source Equipment (PSE) device and a network device (or between the midspan PSE device and a powered device (PD)) enables data communication from the network device to the intelligent midspan PSE device. The communication link provides a communication channel that the intelligent midspan PSE device may use to perform additional functions such as reallocating power, budgeting power, enabling or disabling Power over Ethernet (PoE) for a particular PD, prioritizing PoE management, and the like.

Intelligent midspan PoE injector

According to one embodiment, an Ethernet switch includes a plurality of ports operable to receive and transmit Ethernet traffic. The Ethernet switch also includes system monitoring software operable to receive an indication from a user of a plurality of fault conditions for which generation of an alarm is desired. The system monitoring software is also operable to monitor the Ethernet switch for the plurality of fault conditions and generate a signal indicating a particular one of the plurality of fault conditions has occurred. The Ethernet switch further includes at least one relay responsive to the generated signal that is operable to turn on a respective alarm indicating a particular fault condition has occurred.

Ethernet switch with configurable alarms

A fault-tolerant stack of low cost switches each having only two dual-purpose uplinks is enabled by utilizing a specified topology for connecting the uplinks and implementing a recovery algorithm on each switch.

Dual-purpose uplinks used in a fault-tolerant stack

According to one embodiment of the invention, an apparatus includes a housing having a front side and a bottom side adjacent the front side. The apparatus also includes a plurality of light generating devices each operable to generate light in response to operation of a particular component of the apparatus. The apparatus also includes a plurality of light pipes each associated with a respective ones of the light generating devices and operable to display light generated by the respective light generating device such that the light is visible on the front side and on the bottom side of the housing. According to another embodiment, an apparatus includes a housing having at least one heat sink disposed therein and overlying a component of the apparatus. The apparatus also includes at least one heat sink having a base and a plurality of fins extending from the base. The apparatus also includes an elastic clip having a middle portion placing an elastic force on the base in order to couple the heat sink to the component and two end portions securing the clip in place.

Industrial ethernet switch

According to one embodiment of the invention, an apparatus includes a housing having a cavity configured to receive a plug. The apparatus includes a plurality of conductive pins each configured to contact a respective one of a plurality of conductive pins on the plug when the plug is inserted into the cavity. The apparatus also includes a discharge conductor system configured to contact at least one of the plurality of the conductive pins on the plug before complete insertion of the plug into the cavity and a discharge circuit coupling the discharge conductor system to ground.

Growing community of inventors

Austin, TX, United States of America

Craig Zimmerman