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WO/1985/003614A1 |
Circuit arrangement for the electric supply of devices in a telephone set enabling to supply the devices with an optimum power. To this effect, there is provided at the input of the telephone set a transverse member (35) with an ohmic re...
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WO/1985/002083A1 |
Channel unit (109) for connecting a carrier channel multiplex or tie line directly to a terminating unit line such as that terminating a private branch exchange (102) or a telephone station set (117) thereby eliminating the normal local ...
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WO/1985/001853A1 |
The electronic adapter for a telephone, enabling to produce a complementary call warning, different from the conventional ringing caused by a ringing signal, comprises, in combination: direct branching means (3) to the telephone cable (4...
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WO/1985/001404A1 |
High voltage electronic contacts (S, S') and associated devices including TRIMOS (MOS TRIacs) devices connected in anti-parallel fashion between two terminals (S1/S'2, S2/S'1). Each electronic contact (S, S') is controlled via a control ...
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WO/1984/004857A1 |
A ringing signal generator in which a low-level reference ringing signal, generated by a reference waveform generator (101), is amplified by a delta-modulation power amplifier (106, 108). The low-level reference signal is digitally encod...
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WO/1984/003809A1 |
A floating battery feed circuit (10) comprising a switching-mode, flyback power converter (200) wherein a capacitor (C3) connected to a converter transformer winding (201) develops a relatively low voltage used to energize the converter ...
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WO/1984/003408A1 |
In the disclosed coded telephone ringing signal method and circuitry, audibly distinguishable ringing codes are generated by alternately shifting between at least a pair of single frequency tone at different modulation rates. Other disti...
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WO/1984/003405A1 |
An electronic tone ringer responds to ringing signals on a telephone line (101, 102) while being unresponsive to dialing pulses or other signals on the line. Powered directly from the telephone line or alternatively from an external DC s...
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WO/1984/003191A1 |
Method of adjusting a BORSHT/SLIC circuit and to a circuit arrangement therefor. The BORSHT/SLIC circuit includes a pair of signal paths coupling a receive terminal of a four-wire interface with the terminals of a two-wire subscriber lin...
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WO/1984/002240A1 |
An apparatus for generating tone signals in the terminal equipment of a digital telecommunication system, the form of the signals being determined by digital condition information obtained from the exchange, e.g. a ringing tone signal or...
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WO/1984/001248A1 |
A telephone line interface (14) which performs the BORSHT functions employs pulse width modulation (36) and eliminates dc in the transformer (28) to reduce the size of the coupling transformer (28) thereby reducing space and costs. The r...
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WO/1984/001250A1 |
An apparatus for supplying current to a subscriber telephone set (RL) connected to a telephone exchange via a two-wire line departing from a a-wire and a b-wire output terminal in the arrangement. The arrangement includes two analogue am...
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WO/1984/001249A1 |
An apparatus for applying current to a subscriber line telephone set (RL) with associated two-wire line connected to a telephone exchange. The apparatus includes two analogue amplifiers (5, 6) each with its output connected to one of the...
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WO/1984/000459A1 |
A method in current feed to a subscriber telephone from a telephone exchange in which there is arranged a voltage source (11). A differential amplifier (1) senses the potential difference between the poles of the voltage source (11), and...
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WO/1984/000270A1 |
The present apparatus for controlling the application of telephone line power in a telephone set has obviated the requirement for a local source of power at the premises of a telephone customer. A data processor-based telephone set incor...
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WO/1983/003940A1 |
An accumulation condenser (8) is arranged so as to be charged by the supply voltage of the apparatus when the subscriber's circuit (a, 1, 2, b) is open. A direct voltage converter (14, 15) supplies the electric elements (17-20) of the en...
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WO/1983/003504A1 |
A supply circuit for a two-wire line is included in a DC-magnetized hybrid transformer in which the two primary windings (l1, l2, l1', l2') are magnetically coupled to two pairs of secondary windings (l3, l4). The primary winding is divi...
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WO/1983/001355A1 |
A detector circuit (214) for detecting the on-hook and off-hook states of a communication line includes current and voltage sensors (410 and 415, 416) for generating two reference signals. One signal represents the current flowing in the...
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WO/1983/001162A1 |
A subscriber loop interface circuit (SLIC)(10) is used in a terminator circuit (100) which is ground referenced for providing signal conversion between a two-wire bidirectional transmission signal path (102, 104) and a pair of two-wire u...
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WO/1983/001163A1 |
A balanced multiplier circuit for a subscriber loop interface (SLIC)(100) which provides both loop current to a two-wire bidirectional subscriber loop (12, 14) and suppression of longitudinal signals generated at the two-wire loop input ...
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WO/1983/000959A1 |
A floating, constant power, battery feed circuit wherein a single transformer (30) is used to perform the functions of battery feed and audio coupling. AC feedback is used to control the dynamic output impedance of the circuit. To achiev...
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WO/1982/002134A1 |
A pulse width modulated voltage converter is proposed, which converts a direct voltage to a sinusoidal alternating voltage with low frequency for use as a ringing signal generator for telephone exchanges. The converter includes a power s...
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WO/1982/001635A1 |
A line interface circuit for a telephone exchange comprises a transmission bridge (10), and loop detector (14) and ring current generator (20) and -V. The ring current generator is arranged to produce a ringing voltage which is offset re...
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WO/1982/000554A1 |
A loop sensing circuit (18, 20, 22, 24, 54, 56) is coupled between a solid state hybrid circuit (10) that provides signal conversion between a pair of unidirectional transmission paths (RX, TX) and a bidirectional subscriber loop (T, R)....
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WO/1982/000372A1 |
The maximum current flow in a circuit is limited to a predetermined maximum value by dividing the load current into low and high current paths with the use of interconnected current mirror circuits (14). By limiting the current flow in t...
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WO/1981/001090A1 |
Telephone range extender which is automatically adaptable to the length of the connected subscriber loop. A loop resistance detector (35) within the range extender discriminates between loops within a plurality of ranges of lengths. For ...
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WO/1981/000657A1 |
An electronic tone ringer responds to ringing signals on a telephone line while being unresponsive to dialing pulses or other signals on the line. Powered directly from the telephone line the ringer uses current sources to provide a high...
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WO/1979/000158A1 |
Electronic equipment for users with two wires-four wires conversion circuit for a telephone switch center and connected to the user by the terminals (1, 2) and to the telephone switch center by the terminals (3, 4, 5, 6). It comprises a ...
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JP7181502B2 |
To provide an emergency telephone apparatus capable of achieving high reliability by stably forming an appropriate driving voltage irrespective of a distance from a supply station for supplying a feeding voltage.A variable resistance cir...
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JP2022122376A |
To provide a DSS console of a premises telephone system which can be used for terminal power feeding in a normal time and can extend an operable time even when battery power is fed in the event of a power failure.A DSS console is connect...
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JP7070999B2 |
To provide a small and low-cost communication device, and a communication method that can reduce increase of power consumption and heat generation.A VoIP gateway 100 includes a plurality of ports 120 that can perform connection of a tele...
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JP6855462B2 |
The present invention is related with a modem device in conjunction with a Low Power Controller, which provides the capability of local control and remote management of electromechanical appliances in cases, where the locally available e...
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JP6756272B2 |
To provide a subscriber circuit capable of preventing distortion of voice flowing to a subscriber line, while suppressing power consumption, even if the power source voltage, to be supplied to the subscriber circuit, fluctuates.A subscri...
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JP2020048074A |
To provide a feeder circuit that is mounted on a subscriber circuit of a switchboard and stably operates at a low cost.The present invention relates to a feeder circuit mounted on a subscriber circuit of a switchboard. The feeder circuit...
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JP6390850B2 |
To provide a technology capable of reducing power consumption to the utmost limit by stopping power sully at all the time excepting for a time in which an extension telephone is being used, in a telephone control device in which a plural...
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JP6301458B2 |
Method for dealing with an anomalous condition in a local network including a power injector, said method comprising connecting the power injector to a communication line extending between the local network and a remote device, said powe...
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JP2018007067A |
To provide a communication system for reducing loss in a communication system.A communication system 100 includes: a subscriber line interface circuit 110 being a function section other than monitoring among BORSCHT functions; a relay 12...
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JP2017199641A |
To prevent the occurrence of a trouble due to instantaneous interruption due to an impact with a simple structure.In a mobile phone, a power supply secondary battery 4 is connected to a power supply line 7 through a breaker 3. The breake...
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JP6201514B2 |
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JP6147936B2 |
Embodiments relates to a transmission device (4) comprising: - a CPE wire line (11) for connection to a customer premise equipment, - a telephone wire line (10) for connection to a telephone service provider, - a DC/DC power converter (1...
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JP6132340B2 |
To provide a power reduction device and a power reduction method that effectively reduce power consumed in a communication system using an ISDN line.A power reduction device 11 is provided between lines 100 of a communication system rela...
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JP6079718B2 |
To secure, in a wide area, communication/calls in a power station even when outage has occurred.An outage time intra-power station communication system includes: a circuit network 2 that is disposed all over a building of a power station...
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JP6080197B2 |
To provide a power consumption reduction method for an IP telephone set, and an IP telephone set and an IP telephone system using the same, capable of achieving a remarkable power consumption reduction for IP telephone sets which had bee...
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JP5995451B2 |
A method and apparatus are disclosed for enabling a telecommunication terminal (200) to notify its user of the arrival of a message via an acoustic or visual signal whose properties are based on one or more attributes of the message. The...
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JP5938916B2 |
To solve the problem in which an existing telephone system in which return from a power saving mode to a normal mode is left to a terminal side determination may be down if a plurality of terminals transition to the normal mode to exceed...
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JP5817596B2 |
To provide means for preferentially supplying electric power accumulated in an accumulator battery included in a telephone device to an external device connected with the telephone device.A telephone device 100 includes: a power storage ...
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JP2015173360A |
To provide a telephone system in which power supply to a specific power receiving apparatus of high priority, e.g., emergency telephones, can be continued reliably, even when the power receiving apparatus performs specific operation for ...
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JP5731049B2 |
Methods and apparatus for conserving power in terminal units (100) that transmit and receive modulated data over a communication loop (120) that is shared with voiceband telephone equipment are disclosed. The methods include monitoring t...
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JP5722825B2 |
To arbitrarily control the maximum power consumption of a telephone exchange.A power supply apparatus comprises: number-of-operating terminal control means which monitors the number of operating terminals that is the number of first term...
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JP5618382B2 |
To provide a technology capable of reducing useless power consumption by stopping power supply from a main device for a telephone terminal low in use frequency in accordance with a peak of power demand at which power saving is really req...
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