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| Number | Title | Issue Date |
| 7110528 | Amplifier for unshielded twisted pair wire signals An analog electronic circuit is placed between the central office of a telecommunications provider and the customer premises equipment of a digital subscriber line system which uses unshielded twisted pair wires (“UTP”). The electronic circuit separates the down... | 09/19/2006 |
| 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 particular, a DSL repeater is coupled to the local loop and amplifies downs... | 07/04/2006 |
| 7058172 | Long distance bidirectional driver A bidirectional long distance driver for Ethernet, named Ethernet Booster, is disclosed that comprises a forward transmission circuit and a backward transmission circuit, wherein each of the circuits includes Ethernet interface socket RJ45, an impedance matching cir... | 06/06/2006 |
| 6999433 | Method of reducing near-end crosstalk in an MxU networking architecture HPNA MxU network for an MxU, the MxU including a plurality of HPNA LANs, each of the HPNA LANs operating according to a synchronous communication specification. Each of the HPNA LANs includes a plurality of nodes, one of the nodes within each HPNA LAN being a gatewa... | 02/14/2006 |
| 6977958 | Differentially-driven loop extender 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 particular, a loop extender is coupled to the local loop and differentially... | 12/20/2005 |
| 6917646 | Circuit for exchanging communications over a transmission line A circuit for exchanging communications via a transmission line, including a detector for detecting a predetermined start-of-communication signal, a means for coupling the transmission line on the one hand to a transmit line to provide outgoing communications to the... | 07/12/2005 |
| 6909724 | Synchronizing service instructions among forwarding agents using a service manager A method of obtaining instructions for routing a packet is described that includes receiving a packet having a packet flow identifier that includes a packet source IP address, a packet destination IP address, a packet source port, and a packet destination port and c... | 06/21/2005 |
| 6792105 | Current-mode differential active hybrid circuit In at least one embodiment, a current mode differential active hybrid circuit having an H-bridge output driver with a first output resistor coupled across a transmission medium output. Drive circuitry is coupled to the output H-bridge and constructed to supply data ... | 09/14/2004 |
| 6507573 | Data transfer method and system in low voltage networks This invention relates to a method for data transmission in two-way communication via low-voltage systems that are linked to a higher order telecommunication network. Data transmission takes place within the low-voltage system at a high-frequency range of... | 01/14/2003 |
| 6507606 | Asymmetric digital subscriber line methods suitable for long subscriber loops Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first ... | 01/14/2003 |
| 6044147 | Telecommunications system An apparatus for improving signal quality in a communications link includes apparatus for regenerating only the speech-like characteristics of signals received over the communications link so that an estimate of the original speech signal can be retransmi... | 03/28/2000 |
| 5774195 | Broadcasting system discriminating television receiver for differentiating between analog and digital telecast signals A broadcasting system discriminating television receiver including a circuit for evaluating the output of an FM demodulator, a circuit for evaluating the output of an I/Q wave detector, and a controller for controlling a switch based on the results of eac... | 06/30/1998 |
| 5586181 | Metallic channel unit network A channel unit network having a two-wire port for interconnecting a two-wire, bidirectional signal transmitting means with a four-wire digital transmitting means in a communication system to create a precision bidirectional simulated two-wire cable pair w... | 12/17/1996 |
| 5572352 | Apparatus for repowering and monitoring serial links A computer system employs a repeater unit which repowers a serial channel link. The repeater unit also monitors and records non-idle usage and errors for both directions of the repeated serial link. Non-idle usage of the serial link is recorded as a numbe... | 11/05/1996 |
| 5557672 | Channel interface unit A channel interface unit for interconnecting a two-wire transmission path which transmits analog signals and a digital signal transmission path. The channel interface unit includes a digital interface unit coupled with the digital signal transmission path... | 09/17/1996 |
| 5517519 | Apparatus for repowering and monitoring serial links A computer system employs a repeater unit which repowers a serial channel link. The repeater unit also monitors and records non-idle usage and errors for both directions of the repeated serial link. Non-idle usage of the serial link is recorded as a numbe... | 05/14/1996 |
| 5457743 | Metallic channel unit network A channel unit network for interconnecting a two-wire, bidirectional signal transmitting means with a four-wire digital transmitting means in a communication system to create a precision bidirectional simulated two-wire cable pair over a transmission medi... | 10/10/1995 |
| 5422929 | Telephone line repeater and method of testing same A telephone line repeater (28) includes a pattern decoder/recognizer (100) which recognizes, inter alia, an input interrogating signal transmitted on a telephone network (20). The interrogating signal includes an address field (302) having at least one su... | 06/06/1995 |
| 5410594 | Transmission input/output device with reduced power consumption A transmission input/output device for signal transmission through a telephone line, with reduced power consumption, size, and cost. The device includes: a resistor, connected to the telephone line, for setting a signal input and output impedance; and a t... | 04/25/1995 |
| 5373554 | Telephone having separate power circuit for supplying power to speech network A telephone includes a speech network for transmitting an outgoing voice signal and receiving an incoming voice signal from a remote telephone. The speech network is not supplied with power from a telephone exchange through a telephone line but supplied w... | 12/13/1994 |
| 5280526 | Transformer-less hybrid circuit An improved transformer-less electronic isolating transformer is obtained with an output subcircuit that outputs a controlled current rather than voltage. Specifically, the improved hybrid comprises an output drive subcircuit that receives an ac signal an... | 01/18/1994 |
| 5231629 | Full-duplex communication system In a TDM communication system (100), full duplex communication is provided for two communication units(104) and (105) which communicated communication messages through a repeater (102). Communication messages transmitted from the communication units (104)... | 07/27/1993 |
| 5202919 | Metallic channel unit network A metallic channel unit network for interconnecting a two-wire, bidirectional signal transmitting means and a four-wire signal transmitting means in a communication system includes a voice hybrid driver, A/D signal processing circuit, D/A signal processin... | 04/13/1993 |
| 5172409 | Precision FET control loop A telephone line card circuit includes an operational amplifier circuit having first and second inputs and an output. A field-effect transistor circuit has first, second and control electrodes, the control electrode is coupled to the output of the operati... | 12/15/1992 |
| 5131028 | Methods and apparatus for providing reciprocal impedance conversion A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating recipro... | 07/14/1992 |
| 5051980 | Data communication interface device A Data Communication Device permits extended range RS-232 communications between two devices by utilizing a current loop between the remote device and the Data Communication Device. The Data Communication Device may be used for any mix of signal or contro... | 09/24/1991 |
| 4985919 | Secure communication control system Encoder/decoders are associated with conventional local and far-end communications equipment such as facsimile machines. Information to be faxed is encoded at one end, transmitted to the other end, and decoded, without affecting normal communications prot... | 01/15/1991 |
| 4942603 | Methods and apparatus for providing reciprocal impedance conversion A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating recipro... | 07/17/1990 |
| 4910769 | Telephone line interface circuit The invention relates to a telephone line interface circuit for use in switching a call connection between subscriber telephone sets via a switching matrix. The interface circuit is provided with two terminals for connection to a telephone line of a subsc... | 03/20/1990 |
| 4831651 | Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier The invention relates to a method for the gain control of an intermediate amplifier used in two-wire connections of a dial telephone network. The invention is also concerned with an intermediate amplifier used in such connections, the direction of the gai... | 05/16/1989 |
| 4766606 | Signal repeater for multi subscriber communication over single pair telephone line A signal repeater for regenerating digitally encoded signals transmitted in bursts over a single pair telephone line to enable simultaneous communication between a telephone central office and any one of up to four subscriber transmitter/receivers. The re... | 08/23/1988 |
| 4621367 | Signal level compensation in an in-line data communication system An in-line data communication system includes a bidirectional communication cable for connecting at least two terminal stations. A signal level compensation circuit is connected to the bidirectional communication cable for compensating for signal attenuat... | 11/04/1986 |
| 4554415 | Bilateral amplifier A bilateral amplifier is disclosed, which comprises a negative impedance converter which is connected between two signal sources similar in character when viewed as loads. One of the signal sources is utilized as a load for negative impedance conversion w... | 11/19/1985 |
| 4286123 | Bridge amplifier A four-transistor bridge amplifier is adapted for use as a bidirectional speech amplifier between a telephone line and an electronic telephone subscriber's instrument. The amplifier is powered from the line and includes two-transistor sections, one or oth... | 08/25/1981 |
| 4112262 | Telephone station repeater A telephone station repeater is disclosed which will provide bidirectional gain in a long telephone loop at the customer's station. The repeater is powered from the central office battery over the loop and provides gain with very small power consumption a... | 09/05/1978 |
| 4074087 | Bidirectional voice frequency repeater Hybridless bidirectional transmission networks typically include telephone line coupling transformers and unidirectional amplifiers for enhancing outgoing and incoming signals. Unwanted signal components in the outgoing direction, caused by cross coupling... | 02/14/1978 |
| 4065646 | Power converter In a two-wire bidirectional telephone transmission line, a power converter and a directional threshold detector form in combination an impedance transparent bilateral voice-signal controller which can supply stable voice-switched gain to a dominant signal... | 12/27/1977 |
| 4056719 | Two-way telephone transmission system utilizing opto-couplers A two-way transmission system, which utilizes solid state circuitry and a pair of opto-couplers, achieves high linearity and provides high electrical isolation between input and output signals without the use of the traditional hybrid transformer. Each op... | 11/01/1977 |
| 4001524 | Apparatus for transmitting and receiving pulses A duplexer coupling a subscriber line of a PCM telephone system to a modulation channel and a demodulation channel comprises a plurality of transistorized amplifier stages with input connections from the demodulation channel and output connections to the ... | 01/04/1977 |
