Abstract: Line termination units having dual ports for accepting communication traffic of two different types facilitate the concurrent transmission of voice traffic, serial data traffic and packetized data traffic across a telecommunication transport system, such as a DSL (digital subscriber line) system. The bandwidth of the telecommunication transport system is allocated between the differing traffic types to permit the full utilization of the available bandwidth.

Abstract: Methods for molding a surround over a liner to form a composite shell are provided. The liner is placed in a mold and molten surround material is injected into the mold so as to surround the liner. A surface of a protrusion of the liner abuts the mold so that the surface is exposed and is substantially flush with an exterior surface of the surround after the composite shell is removed from the mold. Molten surround material flows into a slot in a perimeter of the protrusion so that when the surround material solidifies, a rib of surround material extends into the slot to form a pressure seal between the liner and the surround. An adhesive is applied to the liner before placing the liner in the mold for reducing relative movement between the liner and surround as the surround material solidifies and the liner and surround cool.

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: Managing line power for network elements in an access network. In one embodiment a current sense system in a line power network is disclosed. The current sense system includes a power supply, a splitter and a sense circuit. The power supply is adapted to supply output current to a twisted pair drop. The splitter is adapted to combine communication signals and the output current on a twisted pair drop. The sense circuit is coupled to sample the output current of the power supply between the power supply and the splitter. The sense circuit is further adapted to output a sense signal that is representative of the output current.

Abstract: A protection circuit for a DSL transceiver unit includes a capacitor connected in series between a first and second portion of a primary winding of a transformer. The first and second portions are coupled to first and second lines, respectively, of a twisted-pair telephone line. A first voltage controlled device is coupled to the first line and a chassis ground. The first voltage controlled device has a first threshold turn-on voltage at which the first voltage controlled device provides a first current path from the first line to chassis ground. A resistive device and a second voltage controlled device are coupled across the capacitor in series. The second voltage controlled device has a second threshold turn-on voltage at which the second voltage controlled device provides a second current path from a first capacitor terminal of the capacitor to a second capacitor terminal of the capacitor. The second threshold turn-on voltage is lower than the first threshold turn-on voltage.

Abstract: Line termination units having dual ports for accepting communication traffic of two different types facilitate the concurrent transmission of voice traffic, serial data traffic and packetized data traffic across a telecommunication transport system, such as a DSL (digital subscriber line) system. The bandwidth of the telecommunication transport system is allocated between the differing traffic types to permit the full utilization of the available bandwidth.

Abstract: An apparatus to filter noise from being induced into a power line. In one a ferrite choke is disclosed that filters noise from being induced into a power line. The ferrite choke includes a tube of ferrite, a supply power line and a return power line. The tube of ferrite is made of a single piece of ferrite. The supply power line is received inside the tube of ferrite and the return power line is also received inside the tube of ferrite.

Abstract: A bit error rate or other performance characteristic of a communication link is monitored using a state machine. The state machine includes at least three states — for example, a NO ALARM state, an ALARM DETECTION state, and an ALARM state. A sliding window is used to determine when to transition from the ALARM DETECTION state to the NO ALARM state or the ALARM state. A sliding window is also used to determine when to transition from an ALARM state to a NO ALARM state. A respective sum is calculated as a function of the sliding window for use in making such determinations.

Abstract: An electronics module is provided.

Abstract: A splitter for enabling a power signal and a communication signal to be transmitted over a common communication link is provided. The splitter includes a line port adapted to be coupled to a communication line, a power port adapted to be coupled to a power supply to receive a power signal, and a communication port adapted to be coupled to a communication circuit that generates and receives communication signals. The splitter also includes a low pass filter coupled between the power port and the line port, the low pass filter including a coupled inductor, a high pass filter coupled to the communication port, and wherein the communication signals and the power signal are transported on the communication line at the line port.

Abstract: A remote assembly is provided. The remote assembly includes multiple line powered remote units, an input power sharing circuit adapted to receive power from each of the multiple line powered remote units and provide a variable output voltage to power auxiliary equipment and a control circuit coupled to the input power sharing circuit, wherein the control circuit is adapted to control the variable output voltage.

Abstract: A method of automatic permanent virtual circuit connection activation is provided. The method includes detects initiation of communication between a first and a second network element at a first reference point. The method further receives at least one virtual circuit identifier of the first network element and learning at least one virtual circuit identifier of the second network element. In addition, the method creates a translation connection between the first and second network elements.

Abstract: A circuit that uses a bi-directional buffer as follows: First a tri-state output buffer is connected to a functional clock and a bi-directional port is connected to a test clock. The bi-directional buffer is configured to receive control signals to selectively block and unblock the tri-state output port connected to the functional clock. In addition, the bi-directional port connected to a test clock is connected to the internal logic of the device. When the tri-state output buffer connected to the functional clock is blocked, the test clock transmits a clock signal to the internal logic of the device. When the tri-state output buffer connected to the functional clock is unblocked, the functional clock transmits a clock signal to the internal logic of the device.

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 port isolator apparatus includes an optical isolator circuit that electrically isolates an input circuit from a high-speed output circuit. The input circuit uses a transistor to control the current flow of a data signal into the optical isolator. The optical isolator generates, from the data signal, an output signal that controls the high-speed output circuit in the regeneration of the output signal. The output signal is substantially similar to the input data signal. The input circuit and the optical isolator circuit are coupled to one power and ground circuit while the high-speed output circuit is coupled to a second power and ground circuit that is isolated from the first power and ground circuit.

Abstract: A device apparatus and method are detailed that allow for improved bit error rate (BER) testing, configuration, and operation of a communication device and associated physical communication link, in particular on a HDSL communication device and link. The improved communication device apparatus and method additionally allow for the communication device to utilize an embedded BER tester (BERT) to run commonly utilized BER tests on high speed communication channels (downstream and upstream) associated with the communication device. The device apparatus and method also allow for a BER test to be configured and initiated remotely, with loopback at a remote device and masking of alarm states at the remote device or local device until the BER test is complete.

Abstract: Methods and systems of monitoring voltage input to network elements are provided. One method includes receiving an input voltage for a line-powered network element, applying the input voltage across a primary winding of a flyback power converter during an on-time of a primary switch, and transferring the input voltage from the primary winding to a secondary winding of the flyback power converter during an off-time of the primary switch. The method further includes sensing the voltage of the secondary winding during the on-time of the primary switch; and drawing minimal current from the flyback power converter.

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 system for managing and routing one or more data cables is disclosed. This system comprises a telecommunications enclosure and a cable routing station. The telecommunications enclosure has an external surface that houses at least one data cable. The cable routing station is coupled to the external surface of the telecommunications enclosure and is adapted to selectively route one or more of data cables away from the telecommunications enclosure.

Abstract: A ring voltage generator uses values stored in random access memory to generate a train of pulses used to drive a voltage waveform to ring a telephone ringer. The values are stored in RAM, and are programmable by a user without requiring a change in the ring voltage generator design.