Avaya Technology LLC

Billy G Fuller

Donald G Koch

Richard Alan Windhausen

Richard D Miller

Michael A Smith

David Martin Sueper

John Michael Nichols

Mark R Berg

Walter Patrick Christmas

Victor Medrano

The system for simplified operating system shutdown enables the execution of the required operating system shutdown sequence without requiring the use of a monitor, keyboard, and mouse. This is accomplished by equipping the printed circuit board with a simple switch and an indicator device to provide the user interface to execute the operating system shutdown process. The user operates the switch, which activates the system for simplified operating system shutdown to initiate the required operating system shutdown process. The system for simplified operating system shutdown activates the indicator device in a first mode to notify the user that the shutdown process is now executing. The system for simplified operating system shutdown generates a message, which message is transmitted to the processor. This message comprises a system call for a shutdown and restart. No indication is provided by the operating system to indicate the successful completion of the shut down process, but in the restart process, the operating system generates predetermined POST codes, which are detected by the system for simplified operating system shutdown and used to hold the processor in a reset state. The system for simplified operating system shutdown then activates the indicator device to a second mode to indicate to the user that the operating system is shutdown and the circuit board can be removed from the circuit pack carrier.

Operating system shutdown absent a display and keyboard for a processor located on a printed circuit board

Disclosed is a way of enhancing capabilities of an interface, such as a communications bus ( ), while retaining backwards compatibility of the interface. The bus has a plurality of signal lines ( ) including critical control signal lines. Legacy devices ( ) present a legacy interface to each other over the bus by communicating with each other via a legacy protocol ( ) over the bus. Critical control signals of the legacy protocol are conveyed by the critical control signal lines. New devices ( ) present an enhanced interface to each other over the same bus by communicating with each other via an enhanced protocol ( ) over the bus. Control signals of the enhanced protocol are conveyed by signal lines other than the critical control signal lines for the legacy protocol, so that the critical control signal lines remain idle or invalid for the legacy protocol. The new devices signal to each other an intent to use the enhanced protocol by sending a signal on a signal line ( ) that is not used by the legacy protocol. The new devices preferably can communicate on the bus via either protocol, and thus can communicate not only with each other but also with the legacy devices.

Arrangement for redefining an interface while maintaining backwards compatibility

An active-standby dual processor (,) performs only selective memory duplication and does so via hardware (,) and the operating system (,). A page table (,) stores a shadowing flag (,) for each memory page of the active memory (,) of the processor (,) that indicates whether or not the corresponding page is shadowed. When the operating system allocates (,) memory to a process&mdash;either statically at creation of the process or dynamically during execution of the process&mdash;it checks (,) whether the process program's data statement indicates shadowing or whether the MALLOC request includes a segment selector that indicates shadowing; if so, it sets (,) the allocated page's shadowing flag. When the active processor performs (,) a write of its memory, a page table controller (,) checks (,) if the written page's shadowing flag is set. If so, an interprocessor interface (,) is caused (,) to replicate the write on the standby processor's memory; if not, the write is not replicated.

Selective memory duplication arrangement

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Westminster, CO, United States of America

Billy G Fuller