摘要:
A connection interface for connecting one or more devices under test (DUTs) to one or more remote test and measurement instruments includes a device-under-test connector for connecting a DUT to the interface, a host-instrument connector for connecting the interface to a host test and measurement instrument, and an electrical path between the device-under-test connector and the host-instrument connector. The connection interface also includes a display that has a first portion visually associated with the device-under-test connector and configured to display an identifier for a particular connection point on the DUT. In some embodiments, the first portion of the display is configured to display measurement data from the particular connection point on the DUT. In some embodiments, the display has a second portion that is configured to display information related to the host test and measurement instrument, or to display a name for a particular measurement of the DUT.
摘要:
In general, a test instrument includes a processing system programmed to control operation of the test instrument, including communication with a control system, and programmed to run one or more test programs to test a device interfaced to the test instrument, the processing system including multiple processing devices, and a configurable interface, through which communications are exchanged with the device interfaced to the test instrument, the configurable interface including physical ports, to which different configurations are assignable.
摘要:
An adaptive power adjustment method and means based on reducing crosstalk among DSL lines includes: calculating the crosstalk power spectrum density and the crosstalk function from the neighboring line in current line; calculating the transmission power spectrum density of the current terminal device according to the obtained crosstalk power spectrum density and crosstalk function; and the current terminal device controlling the transmission power based on the transmission power spectrum density. According to the adaptive power adjustment method of the present invention, the transmission power can be increased or decreased. The disadvantageous effect due to the crosstalk among xDSL lines is reduced. Present invention can eliminate or reduce adequately the strong impact on remote terminal application scene, and make the lines achieve the optimum operation state.
摘要:
An adaptive power adjustment method and means based on reducing crosstalk among DSL lines includes: calculating the crosstalk power spectrum density and the crosstalk function from the neighboring line in current line; calculating the transmission power spectrum density of the current terminal device according to the obtained crosstalk power spectrum density and crosstalk function; and the current terminal device controlling the transmission power based on the transmission power spectrum density. According to the adaptive power adjustment method of the present invention, the transmission power can be increased or decreased. The disadvantageous effect due to the crosstalk among xDSL lines is reduced. Present invention can eliminate or reduce adequately the strong impact on remote terminal application scene, and make the lines achieve the optimum operation state.
摘要:
An automatic test system of the type having a pattern generator for generating a stimulus pattern to be applied to a device under test and an expect pattern representing expected responses from the device under test, CHARACTERIZED in that the automatic test system includes synchronization circuitry the synchronization circuitry having: at least one input receiving a stream of data values from a device under test; a comparator coupled to the at least one input, having an output indicating when a start condition is detected in the stream of data values from the device under test; a buffer circuit receiving the stream of data values from the device under test and providing an output stream of data values that duplicates a portion stream of data values from the device under test, the portion selected based on the indication of the start condition from the comparator delayed a deterministic amount relative to the stream of data values from the device under test;
wherein the output stream of the buffer circuit is coupled to the pattern generator for determining whether the device under test produced the expected response; the automatic test system having a failure processor for comparing an expected response from the device under test to the actual response, the automatic test system circuitry being specially adapted to test a plurality of devices under test that respond to the stimulus pattern at independent times, said buffer circuit being arranged for buffering a response signal representing a stream of data values from each of the devices under test; and the buffer circuit being arranged to output a plurality of such streams of data values and applying them to the failure processor, each stream of data values representing a response from one of the devices under test, with all of the streams synchronized at the failure processor based on the time of response to the device under test generating the response signal.
摘要:
Error detection mechanisms (400) for devices (300) that have multilevel signal interfaces (330) test multilevel signals of an interface with a binary test apparatus(404). The error detection mechanisms include converting between multilevel signals of the interface and binary signals of the test apparatus. The error detection mechanisms also include repeated transmission of multilevel signals stored in a memory of a device having a multilevel signal interface for detection by the test apparatus at different binary levels.
摘要:
A method and apparatus for synchronizing digital and analog/mixed signal modules in a test site of an open architecture test system is disclosed. Event triggers from digital modules are routed to an ASYNC module, which selectively distributes them to analog/mixed signal modules. When an event occurs, the trigger may activate an analog/mixed signal module to perform a certain operation. The ASYNC module may also receive triggers from the analog/mixed signal modules and selectively distribute them back to the digital modules or analog/mixed signal modules. The digital modules can be programmed to wait for an analog/mixed signal module to complete an operation, as indicated by a trigger received from that analog/mixed signal module, before continuing. Because embodiments of the present invention enable synchronization of digital and analog/mixed signal modules under pattern control, synchronization can be very precise and repeatable as compared to synchronization from a site controller.