Abstract: A method for processing cells at a user-network interface with automatic identification of virtual circuit identifiers and a testing function is provided. The method includes distinguishing the source of the cell. When the cell is from a first source, the method tests the cell against at least one selected criteria. When at least one test determines the cell is invalid, the cell is marked. When the tests determine that the cell is valid, the method translates a virtual circuit identifier to a default setting and forwards the cell to a queue for further processing.

Abstract: A communication system includes a local unit that has a lower data link layer and a session layer running a data pass-through application and a user interface. The data pass-through application lets the data link layer in the local unit pass data through to a remote unit. The remote unit has a lower data link layer and a session layer executing a user interface. When the data link layer detects that the session layer is unstable and/or locked up, the data link layer transmits a disconnect request to the local unit's data link layer. All further user data sent to the local unit's data link layer is routed to the local unit's user interface.

Abstract: A system uses a resource locking token to allow various processes to have exclusive access to a system resource. The process that receives the token then requests that a local database be updated/synchronized with a master database. The process continues checking the synchronization status every time it gets the token. When the process receives the token and the synchronization is complete, the local database is accessed and the data is used in accessing the system resource. The token is then returned to the system.

Abstract: A housing for a plurality of electronic circuit cards is provided. The housing includes a shell and a single door adapted to selectively close the shell. The housing has a first shelf having opposing first and second edges in frictional engagement with the shell to thermally couple the first shelf to the shell. Moreover, the housing has a second shelf having opposing first and second edges directly contacting the shell to thermally couple the second shelf to the shell. The first and second shelves define a space therebetween for containing the plurality of electronic circuit cards. A backplane is disposed within the shell. The second shelf is removably attached to the shell to enable the backplane to be installed or removed via the single door.

Abstract: A system and method for extending a simple network management protocol (SNMP), or other IP network management messaging protocol to one or more non-IP addressed nodes includes a gateway agent addressable by an IP address, at least one non-IP addressed agent to receive and respond to network management messages; and a process for routing network management messages to and from one or more one non-IP addressed agents based on a unique identifier contained in the message.

Abstract: Multiple local databases are coupled to a master database. The master database includes a number of data objects to be synchronized with the local databases. The state of the objects stored in the local databases is initially set to a pending state. A request is made to synchronize the local database with the master database. The state of the last object to be synchronized is periodically read. Read access to the local database is blocked until the last object indicates that it has been synchronized.

Abstract: A method and system for performing simultaneous tests and avoiding task collisions using a hardware description language includes designating a timeslot for one or more of the simultaneous tests, associating the designated timeslot with one or more of the tasks to be performed in a test, determining if the designated timeslot is available before executing the tasks associated with timeslots and executing the tasks when the designated timeslots become available.

Abstract: A device to audibly verify the activation of a solid state relay. The device includes an audio output device that is coupled to the solid state relay to produce a sound when the solid state relay is activated. The sound produced by the audio output devices emulates the sound of an electromechanical relay when switched.

Abstract: A method of operating a processing device is provided. The method includes defining an effective memory address space with a cached address space and a non-cached address space wherein the cached address space and the non-cached address space each translate to overlap a single physical memory space. Further, the method includes accessing a memory address of the physical memory space without accessing a cache memory system from the non-cached effective address space. The method also includes accessing a memory address of the physical memory space from the cached effective address space with the benefit of the cache memory system.

Abstract: A system for managing power from a power source for at least one line powered network element in an access network is provided. The system includes a power manager that establishes at least one power criterion for the at least one network element. Further, the system includes a power controller that is responsive to the power manager. The power controller and the power manager communicate to manage operation of the at least one network element based on the at least one power criterion.

Abstract: A pulse width modulation controller is coupled to a feedback voltage that is proportional to the power supply output voltage. The controller adjusts a current sense threshold in the controller in response to the feedback voltage. An offset voltage is generated for a predetermined time after the power-up of the power supply. A sum of the offset voltage and a primary current sense node voltage is applied to a current sense input of the controller. The controller generates a switch control signal in response to the sum voltage being less than the current sense threshold. The duty cycle of an output control switch is changed by the switch control signal thus adjusting the output voltage ramp.

Abstract: Methods for bit-level control of dynamic bandwidth allocation are adapted for use in multi-node channelized transport systems. A single status bit is used to indicate the desired allocation status of each transport channel for which dynamic allocation is permitted or desired. The status bit has a first logic level indicative of a desire to have a first allocation status, such as allocated for data traffic, and a second logic level indicative of a desire to have a second allocation status, such as allocated for voice traffic. The status bit may be repeated multiple times within a frame to mitigate the effects of transmission errors. The values of the status bit or bits can be maintained across node boundaries without regard to the framing mechanisms or multiplexing techniques used by the transport system, thus permitting dynamic bandwidth allocation beyond the local loop.

Abstract: An integrated plain old telephone service (POTS) and metallic loop testing (MLT) card provides lifeline telephone service with multiple channel data service. The integrated card can be piggybacked with an ADSL card to provide a single package of POTS, MLT, and ADSL services.

Abstract: A circuit card that includes a single ground plane connectable to a chassis-ground and a logic device having a ground pin connected to the single ground plane. The connection between the ground pin and the single ground plane provides a direct path between the logic device and the chassis-ground. A power supply is connected to an input pin of the logic device for providing a logic voltage to the logic device. The power supply is connectable to a battery.

Abstract: A communication system includes primary and secondary interface cards. A switching circuit allows both of the interface cards to selectively communicate over a medium without inducing reflection. Further, an automatic detection system is provided to allow a management circuit to identify which interface card is coupled as the primary or secondary card.

Abstract: A current sharing circuit provides redundant power supplies with current sharing through the use of multiple feedback loops and existing circuit diodes to generate shared load current within predefined load voltage regulation requirements. A method of sharing current allows adjustment of the feedback loops to accommodate characteristics of the circuit.

Abstract: A fan module having a frame is provided. A fan is disposed within and attached to the frame so as to align with an aperture passing through the frame. A baffle having first and second inclined surfaces in opposition is disposed within the frame. The first surface is for changing the direction of a first fluid flow from the fan, and the second surface is for changing the direction of a second fluid flow so as to direct the second fluid flow through an exit of the fan module.

Abstract: A management system and method are provided to adjust fans used for cooling equipment. The system includes one or more electric fans. The operational speed of the fan(s) is adjusted as the environmental parameters change. For example, the fan speed is increased as the temperature and elevation increase. In addition, fan failure circuitry provides a safe operation feature that increases fan supply voltage when a performance failure is detected.

Abstract: The present invention relates to a method and apparatus for testing components in ATM networks utilizing loop-back based ATM layer testing. The method and apparatus utilize interfaces and identifier codes to send and loop-back test cells along portions of virtual channels to test the virtual channels.

Abstract: Circuits for testing POTS service on a shared POTS/xDSL carrier include microfilters for selective coupling to the subscriber loop side of an xDSL filter associated with a subscriber line interface circuit. Such configurations facilitate testing of the POTS service using an insertion point that is between the xDSL filter and the subscriber loop in a manner that is transparent to subscribers.