Abstract: The invention relates in particular to a method of adjusting power spectral densities of a plurality of telecommunications lines sending data in a plurality of frequency sub-bands, a power spectral density being assigned to each sub band sending data. The method comprises the following steps: selecting at least one line, called the donor line, whose capacity for sending data is higher than a predetermined reference capacity, selecting at least one sub band of said donor line, and reducing the power spectral density assigned to the selected sub band to a predefined minimum power level in said sub band.

Abstract: A system for providing subscriber line power to an auxiliary device may include a primary communications device, a secondary communications device, and an auxiliary device. The primary communications device and the secondary communications device may be connected to opposite ends of at least one subscriber line. The auxiliary device may be connected to the secondary communications device. The auxiliary device may be powered by the primary communications device via the subscriber line and the secondary communications device. A power capacity metric of the at least one subscriber line may be determined. An operating power metric of the secondary communications device may be determined. A power budget may be calculated from the power capacity metric and the operating power metric. The power budget may be enforced. For example, the secondary communications device may limit power to the auxiliary device to enforce the power budget.

Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier.

Abstract: An electronics module for powering auxiliary equipment by using power from a line powered remote unit is provided. The electronics module includes one or more current and inrush limiting control circuits, one or more turn on control circuits, and a voltage control summer which operate to control the output voltage from the electronics module to the auxiliary equipment. The electronics module also includes one or more input switch and current limiter circuits, one or more input filters, and a pulse width modulator power stage and output filter circuit which operate to combine power from one or more remote units into a single power output. Additionally, the electronics module includes a fault monitoring circuit for determining if a fault has occurred in the auxiliary equipment.

Abstract: A system for managing power from a power source for at least one line powered network element in an access network is provided. The system includes a power manager that establishes at least one power criterion for the at least one network element. Further, the system includes a power controller that is responsive to the power manager. The power controller and the power manager communicate to manage operation of the at least one network element based on the at least one power criterion.

Abstract: A power system apparatus replaces outdated and presently unobtainable power systems originally deployed in a variety of RT communication cabinets, incorporating a plug-in programmable control module used to generate alarms in response to the detection of specified events and providing direct plug compatibility to those RT cabinet systems through the use of unique wiring harnesses. Support for advanced broadband and high speed communication circuits, neither originally envisioned nor designed into the original communication RT system, is now provided.

Abstract: One embodiment disclosed relates to an apparatus for supplying redundant power to a plurality of computer systems. The apparatus includes at least one bus bar, a plurality of power supplies each supplying power at a same voltage level, a plurality of power switches, and a power supply management controller. Power inputs of the computer systems are connected to the at least one bus bar. The power supplies are selectively connected to the at least one bus bar using the power switches. The power supply management controller controls the power switches such that the power is supplied redundantly to the computer systems.

Abstract: Systems and techniques for communication over telephony wireline. A command interface and control device may include a wireline input configured to connect the device to an operative line of a wireline telephony network (such as the PSTN) and to transmit voice signals to and receive voice signals from the wireline telephony network. The device may also include a cellular module configured to transmit signals to and receive signals from a cellular telephony network and a system controller to control communications on the wireline input and the cellular module. One or more wireline adapter modules may be configured to provide control functionality local to a telecommunications device.

Abstract: An Ethernet voltage source apparatus and method. The apparatus includes an electrical connector, a receiving circuit electrically connected to the Ethernet cable connector, a voltage regulator/power conditioning circuit electrically connected to the receiving circuit, and a first interface output connector electrically connected to the voltage regulator/power conditioning circuit. The receiving circuit receives a first voltage signal and an Ethernet data signal from the Ethernet cable. The receiving circuit separates the first voltage signal from the Ethernet data signal. The voltage regulator/power conditioning circuit generates a second voltage signal from the first voltage signal. The second voltage signal is configured as a first power source for an industrial/commercial device. The first interface output connector is configured to electrically connect the second voltage signal to the industrial/commercial device.

Abstract: Methods and apparatus to maintain communication services during a power failure are disclosed. An example method comprises detecting a loss of power at a digital subscriber line (DSL) modem and detecting a power status of the DSL modem. The example method also includes, when the power status is in an on state, transmitting a message indicative of the on state of the power status along a subscriber line to a digital subscriber line access multiplexer (DSLAM).

Abstract: In one embodiment, the present invention includes an apparatus having a first pair of low voltage operational amplifiers to generate an output representative of an absolute value difference of first and second line voltages of a subscriber loop, and a third low voltage operational amplifier having an input coupled to the output of the first pair of low voltage operational amplifiers to filter the output and to provide a switch control signal for a switching regulator that provides a voltage used to generate the first and second line voltages. The apparatus may include additional circuits such as a limit circuit to limit the input to the third low voltage operational amplifier and one or more speedup circuits to reduce a filter time constant of the third low voltage operational amplifier during a ringing mode of the subscriber loop.

Abstract: A system for providing power to a network interface device (NID) includes a primary power supply device (PPSD), a battery backup device (BBD), and an electrical bus connecting the PPSD, the BBD, and the NID in parallel. The PPSD is operable to power the NID. The BBD is configured to provide power to the NID in response to a power loss event, such as the PPSD failing to provide adequate power to the NID.

Abstract: A method for calculating availability in line power systems composed of power circuit modules determines power circuit parameters associated with the power circuits, accepting input from central databases. The method calculates a required number of power circuits to complete the line power system, and calculates the total power to be delivered over the power system, based on a power calculator. The method calculates individual power circuit availabilities based on the power circuit compositions and external variables. The method then calculates an overall system availability based on the power circuit availabilities and other external variable inputs. The method may compare the calculated line power system availability with a target availability, revise the power circuit parameters, and recalculate the system availability to meet the target availability.

Abstract: A system identification module for storing system specific information is described. The system includes a housing, a module connector and a persistent memory for storing system specific data associated with a communications system having a backplane. The housing and the module connector define an enclosure surrounding the persistent memory. The module connector can be electrically coupled to and removed from the backplane connector. The persistent memory can be a programmable read-only memory device. System specific information such as the system serial number, the date of manufacture, the system vintage and the common language equipment identifier (CLEI) code can be remotely accessed using the system identification module.

Abstract: Embodiments of the present invention provide an integrated circuit (IC) having an integrated DC-DC power converter therein. This IC is operable to support the distribution of combined power and data signals in a network environment such as an Ethernet network according to protocols such as the power over Ethernet (PoE) protocol. The IC includes a DC-DC power converter, a power feed circuit, and a network physical layer (PHY) module, wherein the PHY module may contain fine line structures susceptible to damage when exposed to excessive voltages. To prevent or reduce the likelihood of damage to the PHY module from voltages supplied to the DC-DC power converter, a common substrate ground is shared between the IC components.

Abstract: A method, and base station, are provided for logging on a portable part at a base station having activating capabilities for more than a single associated portable part, wherein the base station, before a log-on mode is actually switched on, performs a check for an operable connection from the base station to a telecommunication network and, if the check has a positive result, the log-on mode is kept switched off by the base station.

Abstract: A method of ramping up a power supply that supplies power on a communication medium. The method includes supplying power on the communication medium with the power supply operating at a first set point, determining if an overload condition exists, and, if the overload condition does not exist, signaling a first alarm. If the overload condition exists, power is supplied on the communication medium with the power supply operating at a second set point. It is determined if the overload condition continues to exist while operating the power supply at the second set point. If the overload condition continues to exist while operating the power supply at the second set point, a second alarm is signaled.

Abstract: A system for providing DC power on local telephone lines, such as telephone lines in a building or office, for powering devices and circuitry associated with communications over those telephone lines, as well as other functions. Desired voltage and power levels are supplied over local telephone lines by separating the DC power component from the central office or private branch exchange with a DC blocking filter while passing all AC telephony signals. A distinct DC power is then imposed over the telephone line for powering both the telephony service as well as other loads. Conventional telephone off-hook detection is simulated for compatibility with the central office or private branch exchange. The functions required may be integrated, partially or fully within a telephone outlet.

Abstract: In one embodiment, the present invention includes a low voltage SLIC to perform various SLIC functions at a low voltage and provide first, second and bias currents to a high voltage SLIC. The high voltage SLIC is coupled to the low voltage SLIC to receive the currents and generate multiple amplified output currents therefrom. In some implementations, the low voltage SLIC and the high voltage SLIC may be formed on a single substrate of an integrated circuit.

Abstract: In one embodiment, the present invention includes an operational amplifier having a first input to receive a first current formed of an input current and an offset current. A first MOSFET device having a gate terminal may be coupled to an output of the operational amplifier. An output stack including one or more cascoded devices to provide an output current corresponding to a gain of the operational amplifier may be coupled to a first terminal of the first MOSFET device. The operational amplifier may be used in various circuitry, such as a subscriber line interface circuit (SLIC).

Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier.

Abstract: A method, apparatus, and system in which one embodiment includes a network interface device (NID) located outside a building and a power supply unit located inside the building. The power supply unit has an electrical isolation component and one or more ports that couple via a first phone line and a second phone line to the NID to provide isolated DC power to the NID.

Abstract: A data communications device includes a supervisory circuit, a power supply, and a power circuit. The power circuit includes a data communications port, a power supply connection coupled to the power supply, and a power controller coupled to the data communications port and the power supply connection. The power controller is configured to provide a power signal from the power supply connection to the data communications port in response to communication with the supervisory circuit. Upon loss of communication with the supervisory circuit, the power controller is configured to selectively continue to provide the power signal from the power supply connection to the data communications port when a local parameter has a first value, and discontinue providing the power signal from the power supply connection to the data communications port when the local parameter has a second value.

Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier.

Abstract: A device, a method and a line testing device connected to a line-capturing matrix for providing wetting current in the communications field are disclosed. Connecting the line-capturing matrix to a wetting current circuit in a network device makes it possible to acquire a wetting current from the wetting current circuit via the line-capturing matrix in the network device. In accordance with embodiments of the invention, one wetting current circuit may provide wetting currents for lines of multiple ports by connecting to a line-capturing matrix in the network device. The wetting current circuit may be a built-in or an independent wetting current circuit. By using the solution provided in the embodiments of the invention, the cost of system hardware may be reduced while the power consumption of the system may be lowered.

Abstract: A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog section. An input signal receiving unit of the high voltage analog section conditions input voice and low voltage signaling and ringing signals from the mixed signal section, for application to a dual mode, programmable gain, tip/ring amplifier coupled to the loop. A sense amplifier at the output of the tip/ring amplifier is through an auxiliary amplifier to an analog feedback monitor port for closing a loop to synthesize the circuit's output impedance.

Abstract: A network node determines the suitability of coupled devices for being remotely line powered before actually powering them. The node scan its ports to determine which ports are coupled to devices. The node then interrogates the coupled devices. A unique discovery tone or bit pattern is generated and sent to devices coupled to ports. The node then monitors the port for a return signal. If there is a return signal, it is compared to the transmitted discovery signal. The signal will be identical after allowing for line losses if the coupled device is suitable for remote line powering. If the comparison yields a match, the network node supplies remote line power to the device.

Abstract: Terminals are connected via cables in a star-shaped fashion with respect to a HUB in a LAN. Each of the cables includes therein signal lines and power feed lines. The HUB includes therein a power feed section. The power feed section and the power feed lines of each cable are connected to measure a value of current which flows in the power feed lines. If it is judged based on the measured current value that the terminal connected to the corresponding cable is a telephone terminal, the power feeding to the corresponding power feed lines is continued. On the other hand, if the terminal is judged to be a terminal other than the telephone terminal, the power feeding is stopped.

Abstract: A variable power supply is controlled to supply power at approximately a first supply level for an electronic device. The variable power supply is controlled to control a transition of the power from approximately the first supply level toward a second supply level prior to controlling the variable power supply to supply power at approximately the second supply level for the electronic device.

Abstract: Current to a relay causes a telephone to be connected to a SLIC. Following LOOP, a sleep switch opens to interrupt current to the power supply converter after a first predetermined period expires. If the telephone is on-hook, loss of current to the relay causes disconnection from the SLIC, but causes connection to a battery. Current sensed from the battery through an off-hook hook switch generates a current signal. The current signal closes a current switch, which is in parallel with the open sleep switch, thereby providing a current path to the converter. The sleep switch then makes and then the current switch breaks. After awakening, a ring-back signal informs a user that telephony service has been restored and a message may indicate that telephony service is being sought. When the telephone is placed back on-hook, counting of a second predetermined period starts, after which the sleep switch opens again.

Abstract: A system and method indicates the configuration of power to be provided over Ethernet cabling.

Abstract: A subscriber line interface circuit contains a high voltage analog section, and a low voltage and digital signal processing section, that monitors and controls the high voltage analog section. The high voltage analog section includes a dual mode tip/ring amplifier unit coupled to a subscriber loop pair, and an input signal receiving unit, that conditions input voice and low voltage signaling and ringing signals from the mixed signal section. Attributes of and/or enhancements to the high voltage section are used to improve the operational performance of the subscriber line interface circuit, in particular, low noise, low power, wide-bandwidth and wide dynamic range characteristics.

Abstract: A first network device supplies power to a second network device in communication therewith. The first network device comprises a physical layer device which includes a pulse generator to generate a test signal comprising n sub-pulses to be transmitted to the second network device, wherein in n being greater than 2. A detector is responsive to the second network device, and a controller is in communication with the detector and the pulse generator. When the detector detects j pulses which are greater than a predetermined threshold, 1?j<n, the controller, responsive to the detector, enables power to be transmitted to the second network device.

Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier.

Abstract: A system (10) and method (100) for digitizing a complete band of RF channels to allow simultaneous processing of more than one channel. Multiple tunable bandpass filters (14) are used for the particular channels to be processed. The filter outputs are combined (16) to form one signal for digitization (18). In another embodiment, an undesired signal is rejected (112) to provide more available power for a reception of a desired signal.

Abstract: A method and apparatus is provided for DC level control in a line card. The method includes receiving a digital input signal, determining a first DC component value of the digital input signal at a first preselected time, and determining a second DC component value of the digital input signal at a second preselected time. The method further includes determining a difference between the first DC component value and the second DC component value. The method includes providing the first DC component value to a digital-to-analog converter in response to determining that the difference is less than a first preselected value. The apparatus includes a digital-to-analog converter and logic. The logic is coupled to the digital-to-analog converter, wherein the logic is capable of receiving a digital input signal, determining a first DC component value of the digital input signal at a first preselected time, and determining a second DC component value of the digital input signal at a second preselected time.

Abstract: Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a subscriber loop linefeed driver control signal in response to the sensed signals. In one embodiment, A linefeed driver includes power circuitry for providing battery feed to the ring and tip nodes of the subscriber loop in accordance with the linefeed control signal. The linefeed driver includes sense circuitry providing a sensed tip signal and a sensed ring signal. The sensed tip and ring signals correspond to a tip current and a ring current of the subscriber loop. In one embodiment, the integrated circuit is a complementary metal oxide semiconductor (CMOS) integrated circuit. In one embodiment, the linefeed driver comprises only discrete components.

Abstract: A system and method electrically isolates configuration and status information about power provided over Ethernet cabling.

Abstract: The invention provides a method for controlling a subscriber line interface circuit, which is connected to at least one data line and to at least one subscriber line associated with a subscriber, in the on-hook state, having the following steps: on-hook data transmission signals are detected in the data line; if an on-hook data transmission signal intended for the subscriber (102) is detected in the data line (122), the detected on-hook data transmission signal is buffer-stored and the subscriber line interface circuit (106) is switched from a passive operating mode to an active operating mode; the buffer-stored detected on-hook data transmission signal is transmitted by the subscriber line interface circuit (106) in the subscriber line (104) to the subscriber (102); and the subscriber line interface circuit (106) is switched to the passive operating mode. The invention also provides a circuit arrangement for carrying out the method.

Abstract: A device and a method for detecting presence of service on a telephone line prior to and during activation of alternative service on the line. The method comprises performing a first voltage detection on a subscriber line (S20), activating a subscriber line interface circuit (SLIC) if no pre-existing service is detected (S30), the SLIC providing an interface between the subscriber line and a service provider, and performing a second voltage detection on the subscriber line after a usage-dependent time has elapsed (S60), the time being determined by heuristics which consider several factors, including usage history of the line and time of day.

Abstract: A method and apparatus is provided for using a single power supply in a dual mode fashion. A ringing signal is received. A waveform power supply signal based upon the ringing signal. An unbalanced output buffering function upon the signal to be conditioned using an unbalanced buffering circuit. Performing the unbalanced output buffering function includes switching between a plurality of power levels of the waveform power supply signal to maintain a predetermined maximum voltage across a plurality of devices relating to the unbalanced buffering circuit.

Abstract: Data which indicates remaining capacity of a battery in terms of the terminal voltage of the battery is updated by a control unit when necessary, whereby available capacity of the battery is accurately calculated regardless of the extent of deterioration of the battery. In addition to the battery's calculated available capacity, a radio-wave receiving condition and a temperature detected by a temperature detection unit are also taken into consideration to accurately calculate and display an available time. Moreover, the control unit performs the entire process of backing up user data into a non-volatile internal memory (flash memory), which reduces power consumption required for the backup process, resulting in a longer available time.

Abstract: A subscriber line interface circuit (SLIC) for a subscriber loop includes a pair of output amplifiers for connection to the subscriber loop and a transient output current limit circuit. The transient output current limit circuit may have at least one programmable output current limit and limit respective output currents from the pair of output amplifiers based thereon. The transient output current limit circuit may limit both source and sink currents for each of the pair of output amplifiers.

Abstract: A power offload network has a node for receiving at least one supply V1. The power offload network includes at least one switch and a power offload element providing a supply drop of VR. The switch is configurable for selecting a linefeed supply level from the set including {V1, V1?VR}. A subscriber line interface circuit receives the selected linefeed supply level for driving a subscriber line.

Abstract: A power offload network has a first node for receiving a first supply V1 and a second node for receiving a second supply V2. The power offload network includes a plurality of switches and a power offload element providing a supply drop of VR. The switches are configurable for selecting a linefeed supply level from the set including {V1, V2, V1?VR, V2?VR}. A subscriber line interface circuit receives the selected linefeed supply level for driving a subscriber line.

Abstract: A data access arrangement (DAA) circuit for an item of customer premise equipment (CPE, i.e., telephone terminal equipment) utilizes RF coupling across an isolation barrier between two sides of the DAA circuit.

Abstract: A subscriber line interface circuit (1?) for supplying line current (IL?) to a two-wire transmission line connected to a load (RL?), comprises a single current amplifier (3?). That single current amplifier (3?) is to be connected with its output terminal to one (B?) of the wires (A?, B?) of the transmission line, while the other wire (A?) of the transmission line is to be connected to a voltage source (V1?) that can be provided within the subscriber line interface circuit (1?) or external thereto.

Abstract: A system and method for a distribution network is provided wherein cascaded power amplifiers with bypass switching are disposed along the branches of the network. The amplifiers may have an RF modem and a programmable digital computer that enables communication with a headend or a controlling computer as well as a bypass switch control for disabling the amplification function of the amplifiers. The amplifier may have a wireless communication system for communicating with individual subscriber's homes and communicating with a neighboring amplifier system for use in emergency situations or during installation and configuration of the network. The network comprised of the amplifiers may have redundant signal paths, using the wireless communication devices of the amplifiers, which may be used as backup signal paths for certain communications requiring high uptime such as telephony.

Abstract: A linefeed on a subscriber loop is generated to generate a current on the subscriber loop. Whether a relationship between a voltage on the subscriber loop and a threshold voltage for an identified range of voltages satisfies a condition is identified. The linefeed on the subscriber loop is controlled to modify the current on the subscriber loop in response to identifying that the relationship between the voltage on the subscriber loop and the threshold voltage for the identified range of voltages satisfies the condition to help generate the voltage on the subscriber loop in the identified range of voltages. The identifying and controlling are continued to help generate and maintain the voltage on the subscriber loop in the identified range of voltages.

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.