Abstract:
An architecture for protecting circuitry used for signal communications between a frequency translation module (20) and a decoder (60) from transient voltage surges. According to an exemplary embodiment, the apparatus comprises a first signal path between a transmission line and a first reference potential for conducting negative voltage surges between said transmission line and said first reference potential, comprising a first diode and a first clamping diode, wherein a second reference potential is coupled to a junction of the first diode and the first clamping diode, and a second signal path between the transmission line and the first reference potential, comprising a second diode and a second clamping diode for conducting positive voltage surges between said transmission line and said first reference potential, wherein a second reference potential is coupled to a junction of the second diode and the second clamping diode.
Abstract:
The present invention provides a power supply (200) comprising a ground terminal (110, 320), means (102, 104, 240, 242) for receiving and transmitting a telecommunications signal from/to at least one telecommunications device and means (100) for protecting the telecommunications device from a surge by shunting the surge to the ground terminal (110, 320).
Abstract:
A method for the selection of forward error correction (FEC)/ constellation pairings (800) for digital transmitted segments based on learning radio link adaptation (RLA) including formatting a packet transmission having a predetermined number of information bits (801). The packet is then split into a plurality of segments (803) where an RLA is used (805) to determine the optimum format of the packet. The plurality of segments is then sent to a channel encoder for FEC encoding and symbol mapping (807) at a rate selected by the RLA. The segments are then formatted into packet blocks (809) and transmitted in blocks that form a time slot at a constant symbol rate.
Abstract:
A method for the selection of forward error correction (FEC)/ constellation pairings (800) for digital transmitted segments based on learning radio link adaptation (RLA) including formatting a packet transmission having a predetermined number of information bits (801). The packet is then split into a plurality of segments (803) where an RLA is used (805) to determine the optimum format of the packet. The plurality of segments is then sent to a channel encoder for FEC encoding and symbol mapping (807) at a rate selected by the RLA. The segments are then formatted into packet blocks (809) and transmitted in blocks that form a time slot at a constant symbol rate.
Abstract:
An apparatus and method for reducing and balancing the off-state capacitance of an overvoltage protection circuit utilizes one or more diode networks electrically connected in series with an overvoltage protection device. The overvoltage protection device is selected from the group consisting of a gas tube, an MOV, a transient voltage suppressor (TVS) diode and a TVS thyristor. Preferably, the overvoltage protection device is a solid-state overvoltage protector (SSOVP) having at least one thyristor. The diode network includes a plurality of diodes electrically connected in parallel and arranged with opposing polarities so that the circuit is bi-directional. Preferably, the diode network includes a first set of two or more stacked diodes electrically connected in parallel with a second set of two or more stacked diodes and arranged with opposing polarities, and the capacitance of the diode network is less than the capacitance of the thyristor.
Abstract:
The invention describes methods and systems designed to reduce or avoid the effects of longitudinal capacitive imbalance in transmission systems that transmit signals using differential transmission, such as transmission systems comprised of a twisted wire pair transmission path (130). The methods and systems of the present invention optimize the transmission bandwidth that is utilized, including for example, by selecting an increased modulation density format or baud rate (201) in preference to selecting a higher portion of frequency spectrum (202).
Abstract:
An overvoltage protector suitable for protecting conductors comprises first, second and third at least bipolar protection elements (132, 134, 136). A first electrode of each protection element is connected to a common node (138). A second electrode of the first protection element (132) and a second electrode of the second or third protection elements (134, 136) are suitable for connection to a conductor to be protected. The first and third elements (132, 136) have breakdown conduction characteristic in one direction and diode conduction characteristic in the other, and the second element (134) has breakdown conduction characteristic in both directions, wherein the respective first electrodes of the first and third elements (132, 136) are of the same polarity.
Abstract:
To shorten the recovery time of a line driver (1) after an overvoltage on its output terminal (3), a current generating device (5) senses a voltage difference between the output voltage of the line driver (1) and its supply voltage (UB) plus a threshold voltage (UT'), and supplies a current (I) that is proportional to the sensed voltage difference up to a maximum current to the output (3) of the line driver (1) to raise its potential to thereby shorten its recovery time.
Abstract:
The line interface circuit of a modem to be connected to a standard RJ11 jack of a digital PBX (Private Branch Exchange) is used along with software routines resident in the modem to detect the presence of a PBX connected to the modem. Upon going off-hook, the modem, by the software routines, determines whether the connection will harm the interface by one of several software routines. If it appears that the interface circuit may be damaged because a PBX line is present, the modem is instructed to go on-hook (hang up), or if the connection is not harmful to the interface, alerts the user that the modem is connected to a wrong jack.
Abstract:
Vector Control Entity and method therein for Disorderly Leaving Events, DLEs, causing Sudden Termination Change in a DSL system. The method comprises, when a DLE occurs on a line m in a vectored group of DSL lines, and the transmission on line m is, at least partly, continued: obtaining at least one error sample from CPEs connected to other lines in the vectored group of DSL lines, and calculating an estimate of the channel coefficients, H', changed due to the DLE. The estimate is calculated based on the at least one error sample, and thus a channel estimate is provided. The method further comprises modifying a downstream precoder, based on the channel estimate, such that retraining of the other lines in the vectored group due to the DLE is avoided. The estimate of the channel coefficients is calculated based on the model H'=H+CΛH.
Abstract translation:矢量控制实体及其中的方法,用于在DSL系统中导致突发终止更改的无序离开事件DLE。 该方法包括:当DLE出现在DSL线路向量组中的线路m上时,并且线路m上的传输至少部分地继续:从连接到向量组中的其它线路的CPE获得至少一个错误样本 并且计算由于DLE而改变的信道系数H'的估计。 基于至少一个误差样本计算估计值,因此提供了信道估计。 该方法还包括基于信道估计来修改下行预编码器,使得避免了由于DLE引起的矢量组中的其他线路的再训练。 基于模型H'= H +CΛH计算信道系数的估计。