Abstract: Systems for use of guard bands in multipoint-to-point orthgonal frequency division multiplexing communication are provided. In one embodiment, an orthogonal frequency division multiplexing (OFDM) system comprises: a host unit; a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using OFDM; and wherein when at least one tone within the OFDM system carries an upstream alignment signal from at least one remote unit to the host unit to assist in aligning at least one of frequency, timing, and amplitude of transmissions from the at least one remote unit to improve orthogonality of an OFDM waveform received at the host unit, the at least one tone is separated from payload bearing tones within the OFDM system by a guard band of frequency spectrum.

Abstract: A conducted emissions filter is disclosed. The filter includes a main supply port adapted to provide a power signal to a power supply port, along with a common mode choke coupled between the main supply port and the power supply port with at least one adjustable level of inductance for substantially matching a level of impedance introduced through the power supply port without adversely impacting operation of the filter. The filter further includes at least one filter attenuation element connected across return and supply lines between the at least one common mode choke and the power supply port, at least one return line noise return connected to the return line between the at least one filter attenuation element and the power supply port, and at least one supply line noise return connected to the supply line between the at least one filter attenuation element and the power supply port.

Abstract: Methods for variable forward error correction in a multi-point to point orthogonal frequency division multiplexing system are provided. In one emboidment, a method for an orthogonal frequency division multiplexing 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, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; and encoding the upstream information based on a degree of error correction selected by the host unit.

Abstract: A communications device apparatus and method is detailed that allows for improved system statistics gathering of network communication links, dataports, and system status. The improved communications device apparatus and method utilizes a relative time reference or clock for the determination of the starting and ending of system statistics gathering time periods. Thus allowing for the contiguous gathering of system statistics without errors or gaps caused by time changes made to an absolute time reference.

Abstract: Methods and systems for adaptive modulation are provided. In one embodiment, a method for a plurality of remote units of an orthogonal frequency division multiplexing multipoint-to-point communications system comprises: establishing communication between 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 a plurality of tones from the plurality of the remote units such that tones from more than one remote unit are simultaneously received at the host unit, the plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; modulating up to a plurality of tones using a first modulation scheme when transmitting a first type of upstream information; and modulating up to a plurality of tones using a second modulation scheme when transmitting a second type of upstream information.

Abstract: A system is provided. The system includes a host and a plurality of remote units. Upstream bandwidth capacity is shared among a plurality of remote units in a manner that permits at least two of the remote units to transmit to the host at any one time using the upstream bandwidth capacity. The upstream bandwidth capacity includes a plurality of orthogonal tones generated using inverse fast Fourier transforms. The host causes at least one remote unit to adjust the manner in which symbols are transmitted therefrom on at least one of the plurality of orthogonal tones in order to improve the alignment of symbols received at the host.

Abstract: Systems and methods for forward error correction in wideband digital RF transport systems is provided. In one embodiment, a method for transmitting digital data in a wideband digital RF transport system is provided. The method comprises receiving a first digital signal, wherein the digital signal includes a stream of digital RF packets, each digital RF packet comprising one or more data samples representing a digitized wideband RF spectrum; encoding error correction data into the stream of digital RF packets based on an error correction algorithm to produce a stream of modified packets; and transmitting a second digital signal comprised of the stream of modified packets via a communications medium.

Abstract: A bidirectional communication system is provided. In one embodiment, a system comprises a host; and a plurality of remote units, wherein a plurality of tones is shared among the plurality of remote units in order to communicate with the host using orthogonal frequency division multiplexing, wherein the plurality of tones is shared in a manner that permits at least two of the remote units to transmit to the host at any one time using the plurality of tones. The host causes at least one remote unit to adjust a timing of symbols transmitted on at least one of the plurality of orthogonal tones in order to improve an alignment of multiframes received at the host.

Abstract: Systems and methods for an orthogonal frequency division multiplexing multipoint-to-point communications system are provided. In one embodiment, a method 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, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; modulating the up to a plurality of tones using a first modulation scheme when transmitting a first type of upstream information; and modulating the up to a plurality of tones using a second modulation scheme when transmitting a second type of upstream information.

Abstract: A telecommunications optical fiber distribution system is disclosed. The system comprises a support structure defining a longitudinal axis. A plurality of fiber optic signal splitters are arranged radially with respect to the longitudinal axis defined by the support structure, each fiber optic signal splitter including a signal input location and a split signal output location. A plurality of adapters mounted to the support structure are arranged radially around the longitudinal axis defined by the support structure. Each adapter includes a first connection end for receiving a connector terminated to an output cable extending from the output location of the splitter and a second connection end for receiving a connector terminated to an outgoing distribution cable.

Abstract: A tool for engaging a telecommunications connector within a slot so that a releasable latch of the connector is released by the tool. The tool may be used to remove a telecommunications connector from a mating opening of a receptacle or may be used to insert a connector within a receptacle.

Abstract: A telecommunications chassis, module, and repeater circuit for use with signals having data rates including STM-1 (155.52 megabits per second) are disclosed. The chassis provides structures for establishing shielding and heat dissipation for the circuitry modules it contains including an outer and an inner Faraday box with an integrated ventilation pattern for circulating air. The module provides its own structures for establishing shielding and heat dissipation including a Faraday box and a ventilation pattern. The repeater circuit provides the ability to bridge a data signal between a monitor jack of one device and a higher signal level input jack of another device through multiple amplification stages and circuit board structures. The telecommunications chassis, module, and repeater circuit can be used in conjunction.

Abstract: Methods for an orthogonal frequency division multiplexing multipoint-to-point communications system are provided. In one embodiment, a method 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, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; adjusting at least one characteristic of the 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 when received at the host unit is improved; and dynamically switching modulation between tones of the plurality of tones to reduce the impact of using any corrupted tones.

Abstract: A method for accessing an electronic circuit in an enclosure using near field induction is disclosed. The method involves attaching at least one local access port connector with an external transformer core partition to a near field induction port on an external non-conductive surface of a panel of the enclosure and generating at least one inductive field between the external transformer core partition and an internal transformer core partition. Without a direct electrical connection, the method provides for communicating with the electronic circuit through the at least one local access port connector of the panel using the at least one inductive field.

Abstract: A telecommunications device including a chassis having a housing in which a plurality of splitter devices are contained. The housing includes top and bottom walls, front and back ends, and opposing sides. A circuit board is positioned at the back end of the housing. The circuit board includes a front face that faces toward the front end of the housing. The circuit board also includes an upper portion that extends higher than the top wall of the housing and a lower portion that extends lower than the bottom wall of the housing. First telecommunications connectors are mechanically coupled to the front face of the circuit board at the upper portion, and second telecommunications connectors are mechanically coupled to the front face of the circuit board at the lower portion. The chassis of the telecommunications device defines upper open side regions for allowing cables to be routed laterally from adjacent the sides of the chassis to the first telecommunications connectors.

Abstract: A bidirectional communication system is provided. In one embodiment, a system comprises: a host unit and a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using orthogonal frequency division multiplexing (OFDM). The host unit allocates only a subset of available orthogonal tones within the OFDM system to at least one of the plurality of remote units. The host unit allocates a number of orthogonal tones to the at least one remote unit for upstream transmission based at least in part on a type of data to be transmitted by the at least one remote unit.

Abstract: Methods for multiframe alignment are provided. In one embodiment, a method comprises sharing upstream bandwidth capacity among a plurality of remote units in a manner that permits at least two of the remote units to transmit to a host at any one time using the upstream bandwidth capacity, the upstream bandwidth capacity provided by using orthogonal frequency division multiplexing with a plurality of tones; and causing at least one remote unit to adjust the timing of transmissions transmitted on at least one of the plurality of tones in order to improve alignment of multiframes received at the host.

Abstract: A method for maintaining the quality of transmission from a head end to a service unit in a telecommunications system that uses a multi-carrier transmission scheme with dynamic bandwidth allocation is disclosed. The method involves allocating a first payload channel to a service unit in a subband of a transmission channel of the telecommunications system and monitoring the quality of the first payload channel. When the quality of the first payload channel drops below a threshold, the method allocates a second, different payload channel to the channel unit.

Abstract: Methods and systems for controlling power in a communications network are provided. In one embodiment, a method comprises reading a power level of a communication link; and, driving an attenuation control signal based on the power level of the communication link. When the power level is greater than or equal to a minimum supported power level, driving an attenuation control signal further comprises constraining the attenuation control signal to a calibrated range of a characteristic curve. When one or both of the power level is less than the minimum supported power level and a bit error rate is greater than a maximum error threshold, driving an attenuation control signal further comprises generating an attenuation control signal outside the calibrated range of the characteristic curve.