Abstract: A system and method for selecting the operational mode in an ADSL Annex C environment during the handshake operation while increasing the accuracy of the determining the throughputs across the possible frequency spectrum while only having access to the power level of a small number of frequency bins during the handshake operation. In one embodiment of the present invention, the present invention receives signals in a multiple but small number of bins and estimates the loop length based upon the signal power in at least two of these bins. The present invention then identifies the noise profile over the relevant band of frequencies (or a subset thereof) to determine the bit rate. In one embodiment, the present invention selects the mode based upon a the bit rate in a single direction. In another embodiment, the present invention selects the mode based upon both the upstream and downstream bit rates.

Abstract: Single Ended Line Probing (SELP) techniques for devices having transformerless hybrid circuits are disclosed. These SELP techniques provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in Digital Subscriber Line (DSL) system) by computing a transfer function that accounts for the characteristics of the transformerless hybrid circuit and the transmission medium, and relating the transfer function to the length of the transmission medium at one or more frequencies.

Abstract: An apparatus and method supports thermal processing of a microelectronic device such as a semiconductor chip in a substrate by heating the substrate with secondary radiation from an energy transfer device 40, which has a first set of energy transfer regions comprised of an emissive and thermally conductive material, and a second set of thermally insulating regions comprised of a reduced emissivity and reduced thermal conductivity material or free space. A multi-zone-radiant energy source 30 provides radiative energy to energy transfer device 40, with a process controller 36, preferably a multi-zone controller, altering the amount of energy provided by each heat zone associated with each emissive region of energy transfer device 40. Sensors detect the thermal energy level of each energy transfer region to allow controller 36 to adjust the secondary radiation emitted by each region in real time, resulting in a predetermined and controlled distribution of thermal energy on substrate 20.

Abstract: The present invention provides techniques for performing loop diagnostics in DSL communication systems.

Abstract: Single ended line probing techniques for determining if a telephone line qualifies for digital subscriber line service are disclosed.

Abstract: Single ended line probing techniques for determining if a telephone line qualifies for digital subscriber line service are disclosed.

Abstract: A Single Ended Line Probing (SELP) technique using combined Frequency Domain Reflectometry (FDR) and Time Domain Reflectometry (TDR) for characterizing a transmission medium (e.g., DSL) is disclosed. FDR is used to detect one or more reflectors (e.g., short, load coil, bridge tap) in the transmission medium. TDR is then used to determine the location of the reflectors in the transmission medium. In one embodiment, a wide band periodic probing signal is used to probe the transmission medium for reflectors. In another embodiment, gauge information can be used to increase the valid range of the combined FDR/TDR SELP technique.

Abstract: Single ended line probing techniques for determining if a telephone line qualifies for digital subscriber line service are disclosed.

Abstract: Single Ended Line Probing (SELP) techniques for devices having transformerless hybrid circuits are disclosed. These SELP techniques provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in Digital Subscriber Line (DSL) system) by computing a transfer function that accounts for the characteristics of the transformerless hybrid circuit and the transmission medium, and relating the transfer function to the length of the transmission medium at one or more frequencies.

Abstract: SELP techniques that provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in a DSL system) are disclosed. A probe signal is transmitted over the transmission medium at one or more frequencies. A reflected version of the probe signal is then received. Transmission medium impedance is determined based on the ratio of the reflected version of the probe signal and the transmitted probe signal. An estimate of transmission medium length is determined by comparing its impedance to a plurality of predetermined impedances, each of which is associated with a transmission medium having known length. Thus, the length of the systems transmission medium is identified. The transmission medium impedance can also be used to identify the presence of load coils and short circuits in the transmission medium.

Abstract: An apparatus and method supports thermal processing of a microelectronic device such as a semiconductor chip in a substrate by heating the substrate with secondary radiation from an energy transfer device 40, which has a first set of energy transfer regions comprised of an emissive and thermally conductive material, and a second set of thermally insulating regions comprised of a reduced emissivity and reduced thermal conductivity material or free space. A multi-zone radiant energy source 30 provides radiative energy to energy transfer device 40, with a process controller 36, preferably a multi-zone controller, altering the amount of energy provided by each heat zone associated with each emissive region of energy transfer device 40. Sensors detect the thermal energy level of each energy transfer region to allow controller 36 to adjust the secondary radiation emitted by each region in real time, resulting in a predetermined and controlled distribution of thermal energy on substrate 20.