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2016

19374452Apparatus and method for detection of off-hook phone in reverse power feeding architecture
29369593VOIP terminal and ringing parameter setting method therefor
39325859Method for optimising electrical consumption of a residential gateway

2015

49100729Method for handling a telecommunications connection, telecommunications arrangement, switching device and network coupling device

2012

58249242Secure call DTMF signaling

2006

67010120Method for adjusting a ringing signal current in a subscriber line and circuit arrangement

2005

76947554Least mean power consumption in telecommunications systems
86944286Ground key detection circuit and method for interference-resistant detection of the activation of a ground key for telephones
96940970Ring boost circuit to extend ringing range of telephone SLICs
106920209Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access
116917681Peak power management and active decoupling arrangement for span-powered remote terminal access platforms
126873702Telephone subscriber system

2004

136775531Subscriber terminal temperature regulation
146741702Device for connecting a subscriber line to a high frequency link and to a low frequency link
156735305Detection of low tip/ring currents in a line powered DAA
166731738Call tones in communication networks
176728362Continuity testing with call tone messaging in communication networks

2003

186658105Method to reduce distortion of a digital data signal by a pots ringing signal, and related telephone ringing signal generator
196640318Continuity testing in communication networks
206611583Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access
216587560Low voltage circuits powered by the phone line
226577722Call waiting response status
236567521Subscriber loop interface circuitry having bifurcated common mode control
246560323Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access

2002

256480602Ring-detect interface circuitry and method for a communication system
266463297Device and method for automatically disconnecting a call in a mobile radio communication terminal
276456712Separation of ring detection functions across isolation barrier for minimum power
286442271Digital isolation system with low power mode
296442213Digital isolation system with hybrid circuit in ADC calibration loop
306434236PC server telecommunications power system
316408034Framed delta sigma data with unlikely delta sigma data patterns
326389134Call progress monitor circuitry and method for a communication system
336385235Direct digital access arrangement circuitry and method for connecting to phone lines
346359983Digital isolation system with data scrambling
356351528Integrated ringer for short telephone lines

2001

366333664Low operating power, high voltage ringing switch circuit
376307891Method and apparatus for freezing a communication link during a disruptive event
386298133Telephone line interface architecture using ringer inputs for caller ID data
396289070Digital isolation system with ADC offset calibration including coarse offset
406278778System and method of power limiting call processing in telecommunications equipment
416263074User programmable station set bass and treble control
426252784Power amplifier with feedback
436243399Ring signal generator
446222922Loop current monitor circuitry and method for a communication system
456198816Capacitively coupled ring detector with power provided across isolation barrier
466191684Remote supply circuitry

2000

476167135Method and apparatus for generating a ringing signal
486167134External resistor and method to minimize power dissipation in DC holding circuitry for a communication system
496167132Analog successive approximation (SAR) analog-to-digital converter (ADC)
506160885Caller ID circuit powered through hookswitch devices
516144326Digital isolation system with ADC offset calibration
526115469Telephone line ring signal and DC power generator
536104794Architecture for minimum loop current during ringing and caller ID
546049471Controller for pulse width modulation circuit using AC sine wave from DC input signal
556026159Integrated ringer for short telephone lines

1999

565978471Method and device for detecting a ringtrip
575970139T1 channel bank control process and apparatus
585960075Switchmode power converters for telephone subscriber line interface circuits
595943418Ring-trip circuit
605926533Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access
615905786Console and extension telephone system
625903448Four quadrant flyback converter, method of operation thereof and power plant employing the same
635881148T1 channel bank control process and apparatus
645872842Unbalanced ringing using a balanced ringing generator of a subscriber line interface circuit
655870466T1 channel bank control process and apparatus

1998

665848149Subscriber line interface and power circuit
675838788Telephone ringing signal generator
685828728Telecommunications network
695828558PWN controller use with open loop flyback type DC to AC converter
705812658Method and circuit for failsafe switch-hook detection during fault in a telephone system
715809131Ringer circuit for generating sine wave
725790654Digitally controlled ring signal generator
735768368T1 channel bank control process and apparatus
745764755Ring-signal generation in a SLIC
755740241T1 channel bank control process and apparatus
765734712Method for off-hook detection during ringing and the use of a subscriber line interface circuit for off-hook detection during ringing
775723996Leadframe for plastic-encapsulated semiconductor device, semiconductordevice using the same, and manufacturing method for the leadframe
785712910Ring trip circuit having a simple trip detecting circuit of a high response speed

1997

795694465Integrated ringer for short telephone lines
805684874Ringtrip judging circuit
815671272Current mode ring trip detector
825666406Hazard prevention for telephone line interface circuits
835666355Power consumption control method and apparatus for a communication system subscriber unit
845663878Apparatus and method for generating a low frequency AC signal
855659608Line feed circuit with logic level controlled ringing
865655013Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access
875636274Switch controller and method
885602911System and method for eliminating bell tap on analog telephones
895600713On-board ring signal generator

1996

905579386Telephone network alerting cadence control system
915557658Communications marketing system
925553132Method and an arrangement for generating a ringing signal
935539805Power supply system including ringing voltage reset under low input voltage conditions
945535273Circuitry for superimposing small, low energy signals and large, essentially higher energy signals
955530931Method and apparatus for providing a look ahead feature for enhanced call forwarding in a telecommunications system
965528682Double duty capacitor circuit and method
975521964Visual message waiting indication in a telephone voice message system
985517565Integrated ringer relay circuit and method
995515434Impedance setting circuit for a SLIC
1005515417Ground key detector for a SLIC
1015511118Method of providing d.c. feed to a telephone line
1025491746Unique ringing on a prime telephone
1035490054Ringing generator and method for converting DC to AC having continuously adjustable amplitude
1045483592Ringer unit driving system in a subscriber transmission system

1995

1055442692Telecommunication system having a capability of changing the alerting tone
1065440262High-efficiency Ring/MWL generator
1075436964Programmable call progress tones for a switching system
1085428670Communications marketing system
1095426695Ringing signal control circuit capable of suppressing surge voltage
1105406623Method and apparatus for ringing telephone stations
1115402484Telephone circuit assembly
1125402482Ring trip deciding circuit
1135402480Call signal generating circuit
1145396548Communication system utilizing information received during a silent interval between ringing signals

1994

1155369690Telephone call detecting circuit and a method of remotely accessing and testing a telephone
1165367567Subscriber apparatus with ringer generator for sending ringer signal to subscriber line
1175363431Visual message waiting indication in a telephone voice message system
1185347565Order wire device having function for reducing noise in communication system having a plurality of order wire devices
1195341108Amplifier biasing circuit
1205335271Ring trip detection circuit
1215323461Telephone line interface circuit with voltage switching
1225321740Telephone marketing system
1235321596DC/DC/AC power supply for a subscriber interphase unit
124530740720 Hz ring generator using high frequency PWM control
1255295185Ringing signal generation circuit with protection against overvoltage
1265293420Ring trip circuit

1993

1275260996Current limited electronic ringing generator
1285260992Key telephone system with reduction of delay of ring tone generation at telephone set
1295247573Telecommunications system comprising a circuit arrangement for at least one subscriber station
1305230018Communication system for activating an optical display in a communication terminal of a communication switching station
1315228081Ringing signal control circuit for an enhanced subscriber line interface
1325216708Calling signal controller
1335195128Communication system, particularly a telephone communication system
1345191507Polarity inverting circuit
1355185738Fiberoptic telephone systems
1365180987DC-to-AC symmetrical sine wave generator

1992

1375172408Speakerphone state-controlled alerting arrangement
1385103387High voltage converter

1991

1395073922Communication terminal apparatus
1405056135Method of automatic equalized distribution of ring loads for telephone exchange system
1415040209Telephone ringing monitoring and control system
1425027391Call management system
1435014305Line interface circuit
1445001748Ringing signal generator
1454995111Ring trip circuit for subscriber telephone
1464995075Apparatus and method for encoding telephone ringing signals

1990

1474972466Digital composite tone alerting
1484969186Telephone message waiting system and apparatus
1494965692Overload detector and protection circuit
1504964158Power supply for telephone exchange
1514962527Series ringing signal generator
1524962520Composite ringing and coin control voltage detector and method
1534959853Frequency responsive selective ringing circuit
1544955053Solid state ringing switch
1554926467Line card with distributed signaling voltages
1564924511Ring signal generator for generating ring signals of different frequencies and power levels in response to user selection
1574916734Apparatus for separating dc current and ac current components of a composite signal
1584908857Isolated drive circuit
1594908854Apparatus for connecting and disconnecting a ringing signal to a called subscriber
1604896351Apparatus for separating dc current and ac current components of a composite signal

1989

1614866587Electronic ringing signal generator
1624860287Network having a synchronizer for synchronization between a primary and a remote station
1634847896Monolithically integratable telephone circuit for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing
1644837818Telecommunication line circuit
1654827503Integrated ringing circuit and a ring trip circuit for the same
1664821315Electronic contacts and associated devices
1674821314Message and ringing signaling device for a telephone installation
1684809258Circuit arrangement for the indication of loop closure during the ringing condition
1694797917Monolithically integratable telephone circuit for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing

1988

1704782518Apparatus for converting distinctive ring to selective ring in telephone lines
1714748659Calling signal transmission apparatus
1724737989Ringing circuit
1734736412Method of and circuit arrangement for evaluating the output signals of current flow detectors in telecommunication facilities
1744734936Ringing signal sending-out circuit
1754734933Telephone line status circuit
1764731828Ring trip detection in telecommunications exchanges
1774731827Interswitch line circuit
1784726060Line circuit for driving a ringer and a service indicating lamp in a telephone set

1987

1794712233Monolithic telephone subscriber line interface circuit
1804703500Power amplifier
1814686700Telephone off-hook detector circuit
1824677664Method and apparatus for an improved ring trip detection telephone circuit
1834656659Programmable ring signal generator
1844652701Ringing application circuit
1854648019High efficiency ringing generator
1864645881DC level trip detector
1874644476Dialing tone generation

1986

1884631361Programmable ring generator
1894622439Detection of ground or loop start configuration in telephone loop signalling circuit
1904611097Sine wave ring generator
1914609782Solid state signal insertion circuit and method for use in a telephony system or the like
1924605824Circuit arrangement for telecommunication exchange systems, particularly telephone exchange systems with switch facilities for emitting signals
1934584576Ringing signal generator
1944578541Telephone line interface circuit

1985

1954562308Subscriber connection circuit comprising feed resistors which can be bridged in low-ohmic fashion and an indication circuit which effects different indications
1964558183Opto-coupler interfacing circuit
1974555595Sampled port data switching system employing interactive processors
1984540853Apparatus for detecting a loop during ringing
1994539438Active impedance transformer assisted line feed circuit with supervision filtering
2004535303Driver circuit
2014533792Circuit for switching between ring signal and message waiting signal without bell tap
2024528425Method of and circuitry for detecting, at a telephone exchange, the lifting of a subscriber's handset in response to ringing current emitted by the exchange
2034524246SLIC II--common-mode current rejection
2044524245Ring trip detection system
2054500844Ringing signal generator employing delta-modulation power amplification techniques
2064492821Subscriber connection circuit

1984

2074489222Telephone line interface
2084479034Arrangement of interactive processors for control of ports
2094477697Method and circuitry for encoding telephone ringing signals
2104473719Switchhook status detector
2114471169Arrangement of interactive telephone switching processors and associated port data storage means
2124455456Digital supervisory circuit for a telephone system
2134451702Arrangement of interactive telephone switching processors for performing timing analyses of port events
2144447675Ring-trip detector
2154447673Ring trip apparatus for a line circuit connected to DCO switch
2164443669Subscriber connection circuit
2174443663Filtering of port data in a switching system employing interactive processors
2184436960Telephone ringing signal generator
2194435803Analog subscriber/trunk module with shared ringing source and ring-trip
2204429185Voltage detector circuit

1983

2214415961Telephone ringing signal generator
2224409438Ringing control circuit in a telephone switching system
2234406004Ring scheduling apparatus for a digital multiplexed telecommunication system
2244396805Ring trip detector for a subscriber line interface circuit
2254385385Circuit for monitoring a digital signal generator
2264370526Arrangement for applying a ringing voltage to a subscriber's line

1982

2274362908Circuit arrangement for emitting ringing signals in a telephone system
2284356355Apparatus for detecting the closure of a subscriber's line during ringing
2294355209Programmable line circuit
2304355206Ringing control device
2314354062Communication system signaling circuit
2324349703Programmable ring signal generator
2334345169Zero crossing detector
2344341928Ringing signal supply
2354340785Ringing signal supply
2364321430Subscriber's connecting network comprising a symmetrical power amplifier for feeding a subscriber's line
2374320260Circuit arrangement for determining the connection condition of a subscriber line in a telecommunications network
2384320258Arrangement for requesting service for called telephone subscribers
2394310733Arrangement for applying signals to a telephone line
2404310728Ringing device for a private automatic branch exchange

1981

2414306118Telephone set ringing current injection device
2424292473Loop supervision circuit
2434284854Universal signal generator for generating telephone system high level signals
2444284853Telecommunication subscriber line access circuit with ground key indication and a device for call signal generation
2454282410Ringing signal generator
2464276447Signal processing apparatus for subscriber circuits
2474273964Ring and tone plant
2484270028Digitally activated ringing circuit for generation of AC voltages
2494264786A.C. Signal current transmission trunk circuit for telephone exchange systems
2504262172Ring-trip detector

1980

2514239941Ringing signal generator
2524234762Ring trip detector circuit
2534230910Signalling and channel loop test circuits for station carrier telephone system
2544220826Ringing generator
2554211896Subscriber's circuit with a symmetrical amplifier
2564201897Ringing voltage transfer circuit
2574199664Telephone line circuit
2584192007Programmable ringing generator
2594191859Loop, dial pulse and ring trip detection circuit with capacitive shunt network
2604189764Current controlled inverter

1979

2614174467Ringing signal generator for use in a subscriber's line circuit
2624166930Transient free ring relay circuit for arbitrary time switching
2634166928Loop, dial pulse and ring trip detection circuit
2644164713Dual mode telephone subscriber loop current detector
2654158170Line current detector
2664156150Circuit for regulating a DC voltage on which a large AC voltage is superimposed
2674152670Signal generator, especially for ringing current in telecommunication system
2684150260Subscriber's circuit for four-wire-system local switch
2694145577Ringing control apparatus
2704132864Digital measurement of the DC value in an AC signal adapted to telephone off-hook detection

1978

2714113990Signal sending control system
2724110569Method and apparatus for monitoring the on/off-hook status of a telephone set
2734104488Subscriber line circuit
2744099032Loop current detector
2754087646Dual mode telephone subscriber loop current detector
2764071709Line conditioning and transfer circuit

1977

2774056693Voltage and current controlled converter for telephone ringing
2784025727Balanced tone application system
2794022980Ring trip detector
2804021617Telephone ringer isolator
2814012702Chime generating circuit
2824001516Apparatus for feeding and controlling ringing currents in telecommunication systems

1976

2833946164Precise tone signal generator
2843941941Relayless switching circuit for application of ringing signals
2853941939Electronic ring trip circuit
© 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017