Adtran Gmbh

Jared Daniel Cress

Daniel M Joffe

Nagaraj Padur

Kevin W Schneider

Charles E Polk, Jr

Troy Wayne White

Joshua Daniel Morgan

Ronan A Kelly

A connection system has a high-density, high-speed connector that is electrically connected to a plurality of cables by a tiered circuit board. Edges of the circuit board are offset in order to form steps on which conductive pads may be formed. Each set of pads on a given step may be electrically connected to one or more conductors of a cable, such as a twinax ribbon cable. Thus, each of the cables may be coupled to one or more conductive pads on a respective step of the circuit board such that a large number of conductors may be electrically interfaced with the connector in a relatively small space, unencumbered by the bend radius of the cable. In addition, the cables may be coupled to the circuit board in a manner that does not require significant bending at the ends of the cables helping to preserve signal integrity. That is, conductive paths turn at high angles (e.g., close to 90 degrees) within the circuit board rather than at the ends of the cables connected to the circuit board.

Tiered circuit board for interfacing cables and connectors

A system for performing failover switches in an optical network, such as a time and wavelength division passive optical networks (TWDM PON) like NG-PON2, includes a backup optical line terminal (OLT) for backing up communications of a primary OLT. The backup OLT is configured to allocate small upstream time slots, referred to herein as 'de minimis' time slots, to at least one optical network terminal (ONT) communicating with the primary OLT during normal operation. When a failure occurs that prevents communication between the ONT and the primary OLT, the ONT autonomously tunes to the upstream and downstream wavelength pairs of the backup OLT and begins to transmit data to the backup OLT in the de minimis time slot allocated to it. The presence of data in the de minimis time slot indicates the occurrence of a failover switch to the backup OLT, and the backup OLT then begins to allocate time slots to this ONT, which is normally serviced by the primary OLT according to its normal TDM algorithm.

Systems and methods for performing optical line terminal (OLT) failover switches in optical networks

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for reducing jitter and latency in a PON. In one aspect, an optical network unit includes a downstream optical receiver configured to receive downstream traffic over a first wavelength; a first upstream optical transmitter having a first data rate; a second upstream optical transmitter having a second data rate that is higher than the first data rate; and a controller configured to direct upstream traffic to one of the first upstream optical transmitter or the second upstream optical transmitter depending on a traffic type of the traffic. Traffic having a control plane traffic type is directed to the first upstream optical transmitter and traffic having a data plane traffic type is directed to the second upstream optical transmitter.

Enhanced passive optical network

A communication system has a network access device (NAD) that is designed to deliver Plain Old Telephone Service (POTS) along with high-speed data to Customer Premises Equipment (CPE). The NAD is backpowered by the CPE across a subscriber line. When backpower is provided from the CPE, circuitry (referred to as a 'POTS signaling element') within the network access device converts POTS control signaling to digital data for transmission to the CPE. The band vacated by the POTS control signaling is used for the power signal on the subscriber line. In the absence of backpower, components of the network access device are bypassed, thereby providing POTS in the event of a power failure. The NAD receives advance warning of the backpowering so that it can disable the bypassing in order to prevent the power signal from leaking through the NAD to the network.

Systems and methods for powering network access devices from customer premises equipment

Methods, systems, and apparatus for communicating over a radio link by devices with broadband connectivity are disclosed. In one aspect, a telecommunications device includes a first transceiver, a second transceiver, and a state monitor. The first transceiver communicates over a broadband link. The second transceiver communicates over a radio link. The radio link is a Low-Power Wide-Area Network (LPWAN) link. The state monitor includes one or more processes that monitor a state of the telecommunications device, and in response to the state of the telecommunications device being one of a plurality of pre-specified states, transmit, using the second transceiver, data specifying the state of the telecommunications device over the radio link.

Broadband access devices having a radio link

Systems and methods are provided for an optical network unit (ONU) to automatically set its output power level for messages to be transmitted on a passive optical network. The ONU can autonomously determine the appropriate power level based on information provided to the ONU by an optical line terminal (OLT) and characterization by the ONU of optical signals it receives from the fiber. Specifically, the OLT can provide the ONU with control data indicative of the power level used by the OLT to transmit the message and the desired power level of the OLT for messages from the ONU. The ONU can measure the power level of at least one message received from the OLT and determine the path loss based on the measured power and the control data. The ONU can then automatically determine a suitable power level for its response message such that unacceptable levels of crosstalk between channels are avoided without having to perform an iterative power-leveling process that otherwise may introduce significant delays.

Systems and methods for power leveling in passive optical networks

Systems, and apparatus for adding reflection based pre-emphasis to a laser driver. In one aspect, a device includes a load (e.g. a laser) having a load impedance, a first end of a transmission line connected to the load, and a reflective impedance element connected to a second end of the transmission line. The reflective impedance element has a given impedance value that differs from the transmission line's characteristic impedance, and the characteristic impedance differs from the load impedance. This mismatch causes reflections between the reflective impedance element and the load. The reflections between the reflective impedance element and the load combine with an incident signal at the load to create a target signal having a target spectral shape.

Reflection based signal pre-emphasis

In a circuit card chassis, a backplane system includes card guides that are slideable on rails to provide any selected spacing between adjacent circuit cards. A backplane connector assembly extends between each pair of slideable top and bottom card guides. Signal cables can be configured to connect any two backplane connector assemblies to each other.

Field-reconfigurable backplane system

A combination of algorithms and circuits are used to combine POTS, high-speed bi-directional data, and back-powering onto the drop connection for fiber to the distribution point architectures. A telephone adapter device can be utilized to prevent damage from back-powering occurring at POTS telephones connected to the drop connection. In addition, circuits are used to prevent damage from back-powering occurring at POTS telephones directly connected to the drop connection. A circuit is used to provide more consistent power to the electronics at the distribution point even when the input back-power to the distribution point may fluctuate.

Systems and methods for providing back power to a service unit

In accordance with a non-limiting example, a connector mates to a circuit board at a connector interface. The connector often introduces an undesirable level of crosstalk between pairs. Traces are formed on the circuit board in a 'compensation region' that also introduces crosstalk between pairs. The 'compensation region' is created in a geometrically controlled fashion such that the crosstalk in the compensation region is of equal magnitude, but opposing phase to the crosstalk introduced by the connector. Thus, the overall crosstalk is minimized.

Crosstalk reducing conductor orientations and methods

A current limiter in one exemplary embodiment of the present disclosure has a protection element that protects a current limiting element from excessive power dissipation. The protection element senses a parameter that is indicative of an amount of power being dissipated by the current limiting element. The protection element controls the current limiting element based on the sensed parameter such that power dissipation for the current limiting element is reduced to a safe level during a fault condition thereby protecting the current limiting element from damage during the fault condition.

Systems and methods for current limiting with overload protection

A telecommunication system has a telecommunication line for communicating a combined signal and a splitter that is coupled to the telecommunication line. The splitter has a high-pass filter, a low-pass filter, and a current limiter. The high-pass filter is configured to transmit a first component signal of the combined signal, and the low-pass filter is configured to transmit a second component signal of the combined signal. The current limiter is configured to limit a current of the second component signal thereby preventing at least one inductor in the low-pass filter from saturating.

Systems and methods for splitting telecommunication signals with reduced noise

The present invention provides a slope equalizer for use in a voice frequency channel card, which is preferably electronically and remotely controllable, and retrocompatible with existing telecommunication systems. The slope equalizer of the invention includes a high-pass filter followed by a variable gain stage amplifier, where the variable gain stage amplifier is an operational amplifier with a plurality of parallel input signal paths, each of the signal paths being a series-connected resistor and switch. The switch is preferably a FET transistor that is electronically and, optionally, remotely controllable. The circuit topology allows the use of FET transistors having relatively high on-resistances. A further advantage of the topology is that the FET switches are connected to a virtual ground by way of an operational amplifier, thereby reducing on-resistance modulation caused by signal variations across the FET.

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Decatur, AL, United States of America

Jared Daniel Cress