Abstract:
A method and apparatus for protecting multiple telephone lines in a cost-effective manner. The apparatus includes a plurality of diode bridges (10) and a zener diode (12) or thyristor. The plurality of diode bridges is electrically coupled in parallel with each other, and the zener diode is electrically coupled in parallel across and shared by the plurality of diode bridges.
Abstract:
A method for reducing audible noise in a telephone from a splitterless asymmetric digital subscriber line modem. The modem examines the shape of the power spectrum of fast retrain signals both when the telephone is on-hook and off-hook. By comparing the spectra, in particular the slopes of the spectra, the modem may determine the quality of the telephone that shares the telephone loop with the modem. The modem cuts back its transmitted power depending on the quality of the telephone by an amount that suppresses the audible noise in the telephone. In this manner, a customer may simultaneously use the telephone and the modem on the same telephone loop.
Abstract:
A method and apparatus for protecting electronic equipment coupled to a telephone line. The apparatus includes a heat coil (36) electrically coupled in series between the electronic equipment and the telephone line, and a positive temperature coefficient device (PTC) (38) coupled in parallel across the heat coil. The PTC presents a high resistance only to excessive currents, which diverts the majority of the current through the heat coil causing the heat coil to trip and short the excess current to ground.
Abstract:
A line protector is provided which includes positive temperature coefficient resistors in the circuit which are thermally coupled to voltage clamping devices which require protection from failures caused by overheating from conducting excessive amounts of current for a time sufficient to cause device breakdown. This may compensate for the performance variability of the positive temperature coefficient resistors so as to improve the likelihood that they will experience a sufficient temperature increase to switch before the voltage clamping device reaches a breakdown temperature. Furthermore, a line protector which may provide protection against current flow to the communications circuit from overvoltage conditions on the circuit side of the line protector or by a ground potential difference between the line protector and the communications circuit is also provided including positive temperature coefficient resistors positioned between the overvoltage line protector circuits and the communications circuit.
Abstract:
Surge suppressor apparatus comprising AC power line overvoltage protection, telephone voice line overvoltage and overcurrent protection, high speed data line overvoltage and overcurrent protection and coaxial transmission line overvoltage protection, all tied to a common ground.
Abstract:
A protecting device for electric and electronic devices and appliances is provided. The device includes a housing which is mounted in combination: a signal input connection to the EMF surge protection unit (1), a protected output signal connection (2) from the EMF surge protection unit to the users at the protected zone, a logic unit (3) of decision for the signal galvanic connection or attenuation level by a switch (8), an assess Logic unit (6) adopted to evaluate the signal status or the signal usage status, the switch (8) for galvanic connection/attenuation level change from the incoming signal and protected zone signal and logic unit for the assessment of the input signal, define the conditions to pass a request to change mode.
Abstract:
Residential protection service center apparatus comprising AC power line overvoltage protection, telephone voice line overvoltage and overcurrent protection, high speed data line overvoltage and overcurrent protection and coaxial transmission line overvoltage protection, all tied to a common ground.
Abstract:
At least one example embodiment discloses a system including a processor configured to receive a plurality of upstream pilot signals from a plurality of remote transceivers, respectively, in a time domain, determine channel coefficients based on the plurality of upstream pilot signals, determine filter coefficients based on the channel coefficients and to control transmission of the upstream pilot signals in the time domain to physical layers of a plurality of processing devices, the plurality of processing devices configured to communicate with the plurality of remote transceivers through the processor.
Abstract:
A system and method for coupling a communications device to a primary communications network having a first communications format and to a secondary communications network having a second communications format, such that the communications device is configured for having an assigned device identification and configured for using an assigned network address for use in routing data over the primary communications network. The system and method can comprise a first port configured for connecting to the communications device, a second port configured for connecting to the primary communications network and facilitating the communication of the data between the primary communications network and the communications device through the first port, and a third port configured for connecting to the secondary communications network and facilitating the communication of the data between the secondary communications network and the communications device through the first port. Also included is a switching module coupled to the ports and configured for facilitating a selected communication path of the data between either the first port and the second port or between the first port and the third port.
Abstract:
An overvoltage protection module can be fitted to a telecommunications module having telecommunications contacts, to which telecommunications lines are connectable, and has at least two overvoltage protectors, at least one ground contact, and at least two pairs of protection module contacts for contacting the telecommunications contacts at contact points, so that at least two telecommunications lines are protectable, wherein the contact points are located on at least two different levels, and both contacts of each pair of protection module contacts are connected to the same overvoltage protector.