Abstract: Identifying virtual connection to telephony port relations in a telecommunication system. In one embodiment, a database is compiled of associations of virtual customer identity (VCID) information from ATM cells to telephony ports in an access system. The database is compiled by sending calling line identification presentation (CLIP) information across an ATM network along with the VCID to a virtual identification line (VIL) port in the access system. Reading the CLIP information associated with the VCID and storing VCID to telephony port relations in the database based on the CLIP information.

Abstract: Testing of analog-to-digital and digital-to-analog converters formed in integrated circuits. In one embodiment, a method of testing an analog-to-digital (A/D) converter comprises applying an analog test signal of a first frequency to an input of the A/D converter. Sampling digital byte samples from an output of the A/D converter at a second sampling frequency and comparing select digital byte samples with each other. When the select digital byte samples match, storing a verify bit in a memory to verify the A/D converter is working. In another embodiment, a method of testing a digital-to-analog (D/A) comprises creating repeating digital byte samples with a logic circuit formed in the integrated circuit. Converting the repeating digital byte samples into an analog test signal with the D/A converter. Comparing the frequency of the analog test signal with the frequency of an expected analog signal to determine if the D/A converter is working.

Abstract: A method of transferring data from a host system to a target system includes creating a data record for transmitting data to the target in which the record includes a starting address for loading a sequence of data into a memory of the target system, one or more error detection codes, and an uninterrupted sequence of data for loading sequentially into the memory.

Abstract: A head end terminal for a communication system using multicarrier modulation is described. The head end terminal includes a multicarrier modem adapted to receive upstream signals and to demodulate the upstream signals modulated on a plurality of orthogonal carriers in a first frequency bandwidth, the multicarrier modem including a polyphase filter adapted to selectively filter the received upstream signal to provide protection against narrowband ingress for the modulated orthogonal carriers and allow for scalable bandwidth usage in the upstream transmission, and a controller operatively connected to the multicarrier modem for controlling receipt of signals.

Abstract: A low cost differential voltage limiter circuit provides a feedback to regulate a voltage output of a voltage source. In one embodiment, the limiter circuit includes a transistor coupled to outputs of first and second voltage sources. If a differential voltage between the two sources exceeds a predetermined threshold, the output voltage of the higher source is reduced. In one embodiment, a PNP transistor is used to regulate the high voltage source.

Abstract: A tool for installing and extracting a fuse is provided. The tool has a first bar that has a jaw at one end of the first bar. The tool has second bar that is slidably attached to the first bar and that has a jaw at one end of the second bar. The respective jaws are adapted to align by sliding the respective bars relative to each other to retain the fuse between the respective jaws.

Abstract: An analog to digital conversion circuit is provided. The analog to digital (A/D) conversion circuit includes an input adapted to receive an analog signal. The A/D conversion circuit further includes a variable attenuator that is coupled to the input and that has a feedback control input. The A/D conversion circuit further includes a converter that is responsive to the variable attenuator and that converts analog input signals to digital output signals. A feedback loop is also provided. The feedback loop is responsive to an overflow indicator of the converter. The feedback loop is adapted to produce a feedback signal based on the overflow indicator and is adapted to provide the feedback signal to the feedback control input of the variable attenuator so as to maintain the peak level of the input to the converter substantially near an acceptable peak input level for the converter.

Abstract: A system and method for accessing a number of communication lines by one or more testing devices are disclosed. Each of the communications lines is coupled through the system and includes a first termination at a first telecommunications termination site and a second termination at a second telecommunications termination site. The system includes a number of line access devices, each of which is coupled to at least one of the communication lines terminating at the first telecommunications termination site and at least one of the communication lines terminating at the second telecommunications termination site. One or more monitoring busses are defined by a number of relays, one or more of which is coupled to one of the line access devices. A test device interface, which is selectively coupled to the bus, provides bi-directional connectivity between the selected communication line and a selected testing device coupled thereto.

Abstract: A housing for circuit cards is provided. The housing has a shell. A thermally conductive liner integral with the shell lines an interior of the shell. A protrusion of the liner extends through the shell and contacts the shell to form a pressure seal between the liner and the shell. A heat sink is disposed on an exterior surface of the shell and is thermally coupled to the protrusion of the liner. A case is disposed within the liner and is thermally coupled to the liner. The case is adapted to receive a plurality of circuit cards so that the plurality of circuit cards is thermally coupled to the case.

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 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 collar is provided that has a sleeve having a tapered axial bore that defines a tapered surface interiorly of the sleeve. The tapered axial bore is adapted to receive a receptacle such that the tapered surface bears against the receptacle. Moreover, the collar has a resilient device that engages the sleeve. The resilient device, the tapered axial bore of the sleeve, and the receptacle receive a connector. Axial displacement of the connector relative to the sleeve and the receptacle compresses the resilient device such that the resilient device exerts an increasing axial force on the sleeve. The increasing axial force displaces the sleeve axially relative to the receptacle causing the tapered surface to exert a radial force on the receptacle.

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 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 module for radio frequency signal circuits includes an electrically conductive housing. Coax connectors are secured to the rear face of the housing. A circuit board is contained within the interior spaced between sidewalls of the housing. A ground side of the circuit board includes a layer of electrically conductive material which is electrically connected to the housing. Coax cables extend within the interior of the housing from the coax connectors and between the ground side of the circuit board and an opposing sidewall. An opposite side of the circuit board contains circuit components interconnected with one another through a plurality of circuit paths.

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: The present invention relates to a center conductor insulator with a tapered entry for use with a coaxial cable transmission line connector that provides guiding and centering of a center conductor pin within the connector. The present invention further relates to a front sleeve assembly for use with a coaxial cable transmission line connector which incorporates a center conductor insulator with a tapered entry to guide and center a center conductor pin within the connector. The present invention also relates to a compression ring assembly for mounting a connector to a cable, the assembly having a collet engaging a tapered rear seal to compress the collet about the cable. The present invention further relates to a method of mounting a connector to a cable with a compression ring assembly incorporating a collet and tapered rear seal.

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.