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7603486 |
Network management system providing logic signals over communication lines for detecting peripheral devices
A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down...
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7587040 |
Systems and methods for detecting false signals on an outbound call
Systems and methods for detecting false signals on a telephone line. The devices provide an additional verification for outbound calls which result in a disconnected or not in service signal that...
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7567664 |
Method and apparatus for providing accessibility features for a telephone
Method and apparatus for providing accessibility features for a telephone is described. In one example, a telephone system includes a memory, a counter, and a microcontroller. The memory is...
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7450938 |
Method for improving communication success rate in simultaneous call trial between subscribers in mobile communication systems
Disclosed is a method for improving a communication success rate in a simultaneous call trial between subscribers in a mobile communication system. The method includes receiving by a second...
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7330502 |
Input/output circuit and semiconductor integrated circuit
An input/output circuit includes a reference clock generator configured to generate a reference clock. A signal transmitter is configured to transmit serial data in synchronization with one of the...
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RE40020 |
Impedance blocking filter circuit
An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally...
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7315592 |
Common mode noise cancellation
A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel...
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7260152 |
Method and device for injecting a noise signal into a paired wire communication link
The present invention relates to a device and method for injecting a noise signal into a wire pair of a communication link. In operation a differential mode noise signal is received at a first and...
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7254230 |
Subscriber line interface circuitry
A subscriber line interface circuit apparatus includes a signal processor having sense inputs for sensed tip and ring signals of a subscriber loop. The signal processor generates linefeed driver...
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7227943 |
Tone detector
The present invention provides a tone detector that is capable of performing accurate tone signal detection in a short period of time. Specifically, the tone detector according to the present...
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7224793 |
Communication set with detection of set function and line condition
A description is given of a communication set for connection to a communication line such as a telephone line, which communication set includes means for detecting set functions such as ringing...
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7190769 |
Apparatus for controlling operation of a recording device with a telephone instrument
An apparatus for controlling operation of a recording device with a telephone configured for orientation in a first state and a second state includes: (a) an information conveying section for...
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7162028 |
Universal telephony interface polarity detector
A method and apparatus for measuring signals conveyed by a varying the voltage polarity across the tip and ring terminals in a telephone system is disclosed. The invention provides a composite...
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7155000 |
Process, arrangement, devices for seizure of a shared telephone line
The invention relates to the control of access of various appliances of an installation which are connected to a telephone line. The appliances have a priority level. There is provision for the...
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RE39406 |
Telephone line coupler
The telephone line coupler circuit has a single transmit opto-coupler whose output includes a DC bias component connected to a gate of a line seize switch for connecting a DC line seize load across...
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7113587 |
Method and apparatus for non-disruptive telecommunication loop condition determination
The invention provides a low cost, simple, circuit for detecting the condition of a telephone line.
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7103178 |
Speech amplifier-resident mechanism for controllably supplying power to a line circuit
A voltage-coupling and loop current supply mechanism controllably turns on an output transistor within the tip amplifier circuitry portion of the speech amplifier to controllably apply a prescribed...
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7103147 |
Methods and apparatuses for determining loop characteristics using standard voice-band modem
Embodiments of the invention provide methods and apparatuses to determine the characteristics of a local loop using the multi-tone line-probing signals of a standard voice-based modem. For one...
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7095824 |
Instructive out-of-service telephone lines
A method ( 10, 20 ) and apparatus ( 30 ) enables a customer ( 47 ) to distinguish between a dead or broken Internet Protocol telephone line and an out-of-service Internet Protocol telephone line....
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7085370 |
Ringback detection circuit
A ringback detector determines whether ringback by comparing measurements of a characteristic of the received signal, such as the energy of the received signal, to a threshold. The threshold is set...
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7079637 |
System and method for detecting unauthorized call activity
Disclosed are systems and methods which detect unauthorized, impermissible, or otherwise undesired call activity through a silence detection technique employing multiple samples. One embodiment...
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7072385 |
Load coil and DSL repeater including same
Systems and methods are disclosed for improving DSL performance, including ADSL and VDSL performance, over a local loop between a telephone company central office and a customer premises. In...
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7065204 |
Method for transmitting charging signals via a data transmission path using resonance phenomena
Method for transmitting charging signals via a data transmission path using resonance phenomena The invention provides a method for transmitting charging signals, in which an electrical resonance...
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7054435 |
Apparatus and method for determining a minimal time bound for performing tone detection
Performing tone detection for an amount of time that is calculated from the tones that the detector is designed to detect.
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7046755 |
Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines....
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7043012 |
Method and apparatus for ring again feature for a telephone system
A method and apparatus for an automatic ring again feature on a telephone set for a user that answers a telephone call not intended for that user is disclosed. If a user has answered an incoming...
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7027590 |
Dynamic allocation of overhead voltage to support simultaneous transmission of signals on a telecommunication line
Overhead voltage is allocated in a telecommunication system among different AC signals, such as POTS, on-hook transmission POTS, PPM and XDSL signals, communicated between a telephonic switch and a...
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7027587 |
System and method for deriving sealing current
An adaptive unit that taps into an existing POTS line, DLC POTS line, DLC channel unit designed for sealing current outputs, or AC-DC transformer designed for sealing current output, to provide...
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7020274 |
Universal apparatus and method for interfacing signals with telephony networks
A communication apparatus is used to interface signals with any one of a plurality of telephony networks having different impedances. The apparatus includes memory, a processor, a digital-to-analog...
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7016486 |
Method for automatically switching telephone system to an on-hook state
A method of automatically switching in an on-hook state suitable for a telephone system is provided. The method automatically switches a spring circuit from an off-hook state to the on-hook state...
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7006623 |
Circuit for reducing voltage peak in interfacing with a telephone line
According to an embodiment, a DC driver circuit is coupled to a tip/ring line. The DC driver circuit includes a first capacitor coupled to a first switch where the first switch is coupled to an...
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6999581 |
Event detection circuit
A network interface circuit that screens out transient signals and provides an indication to the line side that an actual event has occurred, so that appropriate discrimination circuitry is powered...
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6980643 |
Fallback function telecommunications device
The invention herein is fallback function communications device comprised of a microprocessor, utilized to perform a predetermined operation and processing of a predetermined input signal and then...
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6954531 |
Software controlled ring voltage generator
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...
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6944286 |
Ground key detection circuit and method for interference-resistant detection of the activation of a ground key for telephones
A grounding key detecting device and method for interference-proof detection of the operation of grounding keys in telephones. A circuit that detects the operation of a grounding key includes a...
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6940966 |
Method and apparatus for detection of a telephone CPE alerting signal
A method and apparatus for detecting a signaling tone within a communications channel, such as a telephone line, is presented. The energy level of the communications channel signal is measured at...
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6934382 |
Method for recognizing an off-hook condition on a single subscriber line with two terminal devices
The invention is directed to a method for recognizing, in a system having a first terminal device and a second terminal device connected to a two-wire subscriber line, an off-hook condition of the...
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6914981 |
Communication device
A communication device has a cut-off frequency switching unit for switching a cut-off frequency for communication data at a communication line, and a confirming unit for confirming whether or not a...
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6879686 |
Line take-up detection circuit
An interface circuit including a galvanic isolation barrier between a transmission line and a user equipment, and a detector for detecting, independently from a transmission, the idle or busy state...
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6876741 |
Device for detecting telephone line seizure
The device for detecting telephone line seizure performs a measurement of voltage of the telephone line across a first and a second optocoupler connected in series to the telephone line and...
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6865269 |
Method and apparatus for switch hook detection
A method and apparatus is provided. The method includes receiving a signal over a connection from a telephonic device, determining if the signal is greater than a first preselected value, and...
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6856685 |
Feed arrangement for a subscriber loop with multi-level current regulation capability
A feed arrangement for a telephone subscriber loop. The feed arrangement includes an input for connection to a power supply and an output for connection to the TIP and RING conductors of the...
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6813343 |
Method and apparatus for filtering asymmetric digital subscriber line (ADSL) signals
A method and apparatus for selectively filtering signals on a digital subscriber line (DSL) so as to prevent interference resulting from a telephone instrument switching between its on-hook and...
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6813340 |
Ringing SLIC fault handling
A line card or other telephone or communications interface provided with a ringing SLIC outputs relatively high voltage, such as in excess of about 90 volts, and/or relatively high current such as...
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6810120 |
Method of determining answer supervision at a line appearance of a public switch telephone network
Audible ring, which is provided to all line appearances, is detected and used to determine whether or not a far end party has answered, i.e., answer supervision, for equipment connected to the line...
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6778664 |
Line current protection circuit and method for linear and nonlinear hold circuit
A novel line-current protection circuit for detecting excessive line current from a telephone line and protecting line interface circuitry from the excessive line current is presented. The...
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6778663 |
Method and apparatus for sensing current
A method and apparatus are provided for sensing current in a subscriber line. The method includes receiving a current signal from a driver capable of driving the current signal on the subscriber...
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6757378 |
Method and telecommunications center for recognizing connection requests at a subscriber line
In a circuit arrangement for recognizing connection requests at an analog subscriber line in which a number of subscriber terminal devices such as an analog telephone and an MSFM modem, are...
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6744873 |
Telephone accessory device
A telephone accessory device includes a first circuit that detects an off-hook condition of a telephone and a second circuit responsive to the first circuit wherein the second circuit simulates an...
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6741700 |
Low insertion loss current sense circuit
A current sense circuit for sensing a current in a subscriber loop comprising a transformer having a first and second winding coupled for sensing a differential current in a loop, a sense winding...
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