Abstract: An optical fiber cable management panel includes drawer assemblies, each including a drawer slidable within a chassis. The drawer assemblies are secured together by a bracket that includes an interlock arrangement with the chassis. Such an interlock arrangement includes a non-threaded stud engaging a hole. Radius limiters may be part of the drawer assembly and include a cable entry aperture have a closed perimeter and a flared cable guide surface around most of, and preferably all of, the closed perimeter to allow for the entry of cables from all directions. A control mechanism controls movement of the radius limiter relative to the drawer assembly. The control mechanism includes a rotating member that has an axis of rotation transverse to the slidable motion of the radius limiter and normal to the radius limiter.

Abstract: The invention relates to an active distribution device (1) in the subscriber access area, comprising a multi-service access node (2) which has one interface to a switching center and at least two interfaces to a distribution device, with a first message service being provided via the at least one first interface (7) to the distribution device (3), and a second message service being provided via the at least one second interface (8), the first and/or second interfaces (7, 8) being connected to the distribution device (3), in which the distribution device (3) comprises a changeover device (11) and a switching matrix (12), the first interfaces (7) are connected to first inputs (13) of the changeover device (11), at least the second interfaces (8) are connected to inputs (18) of the switching matrix (12), with the number of inputs (18) of the switching matrix (12) being less than the number of inputs (13) of the changeover device (11), the outputs (15) of the switching matrix (12) being connected to second inputs

Abstract: A fiber optic connection panel including a chassis and a circuit module. The circuit module can include a housing, a plurality of adapters, and a plurality of fiber optic connectors connected to the adapters. The circuit module can also include an optical switch mounted to a printed circuit board, a plurality of fiber optic cables connecting the fiber optic connectors to the optical switch, and a separator plate partially covering the printed circuit board. At least some of the cables can include slack to allow the connectors to be removed from the circuit module, and the separator plate can be positioned to separate the slack of the cables from the printed circuit board. The circuit module can also include a connector edge of the printed circuit board extending through the housing, and a bracket coupled to the housing including members to surround and protect the connector edge.

Abstract: Methods and systems for tone hopping are provided. In one embodiment, a method for an orthogonal frequency division multiplexing (OFDM) multipoint-to-point communications system comprises: establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration; transmitting up to a plurality of tones from the first remote unit modulated with upstream information using OFDM; adjusting at least one characteristic of the up to a plurality of tones such that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the orthogonality of the tones received at the host unit is improved; and dynamically switching modulation between tones of the up to a plurality of tones based on an error-rate history of at least one of the tones.

Abstract: A system and method for protection switching in a transmission network is described. A protection switching mechanism comprises a multiplexer, a transmission path for each output of the multiplexer and a remote circuit. The multiplexer has an input coupled to receive an input signal and a plurality of outputs to output a plurality of output signals. Each transmission path is coupled to receive an associated output signal from the multiplexer. The transmission paths further include one or more redundant transmission paths, wherein signals directed to a faulty transmission path are redirected to an associated redundant transmission path. The remote circuit is used to selectively switch a redundant transmission path for a faulty transmission path at a subscriber.

Abstract: A method for reducing the occurrence of false ground fault detections in a central office terminal is provided. The method includes generating a no-fault signal when no ground current is detected, delaying generation of a fault signal when ground current is detected at least for the duration of an expected pulse in AC induced signal, and when the ground current persists for a sufficient period, generating a signal indicating a fault condition.

Abstract: The present disclosure relates to a telecommunications jack including a housing having a port for receiving a plug. The jack also includes a plurality of contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing, and a plurality of wire termination contacts for terminating wires to the jack. The jack further includes a circuit board that electrically connects the contact springs to the wire termination contacts. The circuit board includes a multi-zone crosstalk compensation arrangement for reducing crosstalk at the jack.

Abstract: An interface card adapted to be mounted at the back plane of a splitter chassis. The interface card includes card edge connectors for providing connections with a splitter card. The interface card also includes cable connectors for inputting mixed voice and data, and for outputting data and voice signals. Tracings are provided on the interface card for interconnecting the cable connectors and the card edge connectors. The tracings are configured such that first tracings carrying data signals from the splitter card to the cable connectors do not cross second tracings carrying voice signals from the splitter card to the cable connectors.

Abstract: A thermal protection device for a fiber optic cable includes a loop formed on the cable and a plurality of sub-units within the cable removed from an outer jacket. A circumferential cut is made through an outer jacket of each sub-unit. A tube is placed about the cut in each sub-unit. A carrier is positioned about each of the tubes and each sub-unit including a circumferential cut. A fiber optic system includes a thermal protection device for sub-units of a fiber optic cable within a frame. A method of providing thermal protection for a fiber optic cable. A kit for providing thermal protection to telecommunications cables.

Abstract: A coaxial panel comprising a frame and a designation tray slidably coupled to the frame is disclosed. The designation tray is movable between an open position and a closed position. The designation tray includes at least one designation space visible when the tray is in a closed position and includes at least two designation spaces that are visible when the designation tray is slidably moved to an open position, the two designation spaces being on different faces of the designation tray. A method comprising providing a movable tray with a front designation visible from a front of the tray when the tray is in a closed position and sliding the tray from the closed position to an open position to expose a side designation is also disclosed.

Abstract: A modular power distribution system comprises a chassis and a backplane including a power input, and a plurality of module connection locations. A plurality of modules are mounted in the chassis, each module mounted to one of the module connection locations. Each module includes: (i) a circuit protection device; and (ii) a power output connection location. Bus bars connect front power inputs to the backplane.

Abstract: Systems and methods for bidirectional communication are provided. In one embodiment, a bidirectional communication comprises a multipoint-to-point host unit and a plurality of remote units communicatively coupled to the multipoint-to-point host unit through an orthogonal frequency division multiplexing waveform. The multipoint-to-point host unit is configured to receive the orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units. The multipoint-to-point host unit is configured to allocate up to a plurality of the plurality of tones to a first remote unit of the plurality of remote units based on a characteristic of upstream information transmitted by the first remote unit.

Abstract: Systems and methods for orthogonal frequency division multiplexing are provided.

Abstract: An electrical connector (10) having a contact element (50) retained in a hollow body (12.) The body (12) has an internal socket structure (44) for receiving an end of the contact element (50) so that insulation displacement contacts (54) of this engage and make electrical connection to wires (70) of an incoming cable (16) to which the connector is connected. Fingers (56) of the connector element (50) extend externally of the connector body and carry electrical contacts (82).

Abstract: Methods and systems for reconfiguring communications systems are provided. In one embodiment, a radio head interface for a communications system comprises: a first interface for communicating with a signal processing module digitally performing waveform processing to modulate and demodulate radio signals; a second interface for communicating with a radio head for transmitting and receiving wireless radio signals; a first buffer coupled to the first interface for receiving a page of data from the signal processing module, the page of data comprising a page header for communicating reconfiguration parameters and a plurality of digital radio frequency samples representing a modulated radio signal; at least one digital frequency converter coupled to the second interface; and a configuration management unit, the configuration management unit adapted to receive the reconfiguration parameters from the page header and reconfigure the at least one digital frequency converter based on the reconfiguration parameters.

Abstract: An improved circuit and method for decreasing the size and cost of switch mode power supplies is disclosed. In one illustrative example, a feedback circuit for a switch mode power supply is disclosed that includes two error amplifiers. The input of a first error amplifier is coupled to a voltage source associated with a load for the supply, and the input of a second error amplifier is coupled to a current source also associated with the load for the supply. Each one of the error amplifiers includes an adjustable shunt regulator that functions as an amplifier stage and diode. Also, the outputs of the shunt regulators are connected together.

Abstract: A cable management panel including a sliding drawer. The drawer including a bottom tray that pivots to provide access to cable management devices mounted on the tray. The drawer including a connection arrangement that locks the tray in both of a non-pivoted position and a pivoted position.

Abstract: Systems for orderwire modulation are provided. In one embodiment, a bidirectional communication system comprises a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing, the host unit communicatively coupled to a plurality of remote units in a multipoint-to-point configuration; wherein the first remote unit is configured to transmit up to a plurality of tones, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; and wherein the first remote unit is configured to modulate at least one tone of the up to a plurality of tones with payload data using a first modulation scheme, and modulate at least one tone of the up to a plurality of tones with control data using a second modulation scheme, the second scheme more robust than the first modulation scheme.

Abstract: The invention relates to a protective plug (1) for a connection module (30), in particular in a terminal distribution box, comprising at least one surge arrester (5), a plastic housing (2), at least two connection contacts and at least one ground contact, it being possible, via the connection contacts, for the surge arrester (5) to be connected to connection contacts of a connection module (30), and it being possible, via the ground contact, for an electrical connection to be produced between the surge arrester (5) and a grounding rail (32) arranged below the connection module (30), the surge arrester (5) being arranged on a printed circuit board (4), the connection contacts being in the form of twin fork contacts (3), and the twin fork contacts (3) being formed with a stop (3c), which stops at a stop edge in the housing (2).

Abstract: A method and apparatus for sectorizing coverage of a cellular communications area includes providing a remote unit having microcell antenna units. Each microcell antenna unit is configured to cover a particular sector. The remote unit is connected to a sectorized base station unit which is connected to a mobile telecommunications switching office. Separate digitized streams representative of telephone signals received from the mobile telecommunications switching office are generated corresponding to the microcell antenna units and the separate digitized streams are multiplexed and transmitted to the remote unit. The remote unit demultiplexes the multiplexed digitized streams into the separate digitized streams corresponding to the microcell antenna units and the separate digitized streams are converted to RF signals for coverage of a particular sector by the corresponding microcell antenna unit.