Abstract: One example method occurs at a switching fabric emulator providing an emulated switching fabric comprising emulated switching elements and associated packet queues, wherein the switching fabric emulator comprises at least one switching application-specific integrated circuit (ASIC) or programmable switching chip, the method comprising: during a test session: receiving, via at least a first physical port of the switching fabric emulator, packets from or to a system under test (SUT); detecting an occurrence of a dropped packet that happens while the packet is traversing the emulated switching fabric; encapsulating dropped packet data associated with the dropped packet, wherein the encapsulated dropped packet data indicates an emulated switching element or packet queue contributing to the occurrence of the dropped packet; and providing the encapsulated dropped packet data to an analyzer.

Abstract: A system and method are provided for implementing a secure configuration of a networked system for secure communications, the networked system including at least one instrument for performing corresponding tasks and at least one controller for controlling functions of the at least one instrument. The method includes providing a secure instrument configuration (SIC); displaying status provided by the SIC server identifying the controller and the instruments to a user via a user interface; writing controller secure configuration information from the SIC server to the controller through a software agent on the controller, the controller secure configuration information including authentication data for the instruments, and/or credentials of the one controller acceptable by the one instruments for identifying the controller; and communicating with the controller to initiate implementation of the secure configuration.

Abstract: Methods, systems, and computer readable media for testing a system under test (SUT). An example system includes a distributed processing node emulator configured for emulating a multi-processing node distributed computing system using a processing node communications model and generating intra-processing node communications and inter-processing node communications in the multi-processing node distributed computing system. At least a portion of the inter-processing node communications comprises one or more messages communicated with the SUT by way of a switching fabric. The system includes a test execution manager configured for managing the distributed processing node emulator to execute a pre-defined test case, monitoring the SUT, and outputting a test report based on monitoring the SUT during execution of the pre-defined test case.

Abstract: A method for network flow metadata processing at a network packet broker is described herein. The method includes, receiving, as input at a network packet broker, network traffic flow data, aggregating the network traffic flow data over a predefined time period to generate Internet protocol (IP) flow feature vectors containing metadata parameters associated with one or more particular endpoint devices, and providing the IP flow feature vectors to a machine learning element in the network packet broker. The method further includes identifying, by the machine learning element, anomalies existing in the metadata parameters included in the IP flow feature vectors, and automatically configuring one or more filter elements in the network packet broker in response to detecting the identified anomalies of the IP flow feature vectors.

Abstract: A method of modeling a nonlinear component includes providing a physical model for modeling a characteristic of the nonlinear component defined by a physical expression having a physical nonlinear function depending on variables and parameters of the nonlinear component; determining performance data for the characteristic; extracting global parameter values for the parameters based on the performance data; extracting local parameter values for the selected parameter, while keeping fixed the extracted global parameter values for the remaining parameters, based on the performance data corresponding to the characteristic using the physical expression; training an ANN function from the extracted local parameter values for the selected parameter depending on a variable; and determining a hybrid model for modeling the characteristic of the nonlinear component defined by a modified physical expression including the physical nonlinear function, the remaining parameters, and the trained ANN function depending on the v

Abstract: Methods, systems, and computer readable media for network security testing using at least one emulated server are disclosed. According to one example method, the method comprises: receiving, from a client device and at an emulated domain name service (DNS) server, a DNS request requesting an Internet protocol (IP) address associated with a domain name; sending, to the client device and from the emulated DNS server, a DNS response including an IP address associated with an emulated server; receiving, from the client device and at the emulated server, a service request using the IP address; sending, to the client device and from the emulated server, a service response including at least one attack vector data portion; and determining, by a test controller and using data obtained by at least one test related entity, a performance metric associated with a system under test (SUT).

Abstract: One example method occurs at an impairment configuration manager of a network test system implemented using at least one processor, the method comprising: receiving impairment definition information for defining one or more impairments associated with a test session involving a test infrastructure connecting at least one test application and a system under test (SUT), wherein the impairment definition information includes information for indicating attributes of the one or more impairments using a common data model or data format; generating, using the impairment definition information, at least one set of instructions for configuring at least one impairment element to implement the one or more impairments during the test session; and providing the at least one set of instructions to the at least one impairment element or another entity.

Abstract: A method of emulating echo signals reflected from an elongated target during radar testing includes identifying first and second end points do the target; acquiring a radar signal from a radar sensor that includes multiple receive elements; generating emulated echo signals, responsive to the acquired radar signal, corresponding to target points on the target, including the first and second end points and reference points located on a line connecting the first and second end points, by repeatedly identifying descriptive attributes corresponding to each of the target points during an integration period of the radar sensor, where the descriptive attributes are identified by interpolating between the corresponding descriptive attributes of the first and second end points; and applying the emulated echo signals to the receive elements of the radar sensor, respectively, during the integration period, where radar sensor calculates a relative position of the target using the descriptive attributes.

Abstract: A method is provided for calibrating a test system, including first and second test instruments. The method includes connecting a first test port of the first test instrument to a second test port of the second test instrument; generating a first RF signal using a first RF source of the first test instrument while a second RF source of the second test instrument is turned off; measuring first phase of the first RF signal at the first test port using first incident and reflected signals; generating a second RF signal using a second RF source of the second test instrument while the first RF source; measuring second phase of the second RF signal at the first test port using the second incident signal and reflected signals; determining a phase difference between the first and second phases; and adjusting the first and/or second RF source to remove the determined phase difference.

Abstract: To model a phased array antenna having a target array of antenna elements, a small array of antenna elements is selected that has fewer antenna elements than the target array. For each antenna element of the small array of antenna elements, far field patterns are captured for a plurality of signal frequencies. S-parameters for the small array of antenna elements are captured for the plurality of signal frequencies. The far field patterns captured for the antenna elements of the small array are mapped to antenna elements of the target array of antenna elements. The S-parameters captured for the small array are mapped to the target array.

Abstract: Methods, systems, and computer readable media for testing a network system under test (SUT). An example system includes physical application-specific integrated circuit (ASIC) switching resources and a switching environment emulator configured for emulating, using the physical ASIC switching resources, data center switching fabric comprising a plurality of data center fabric switching elements. The system includes a first control plane daemon implemented on at least one processor; the first control plane daemon is configured for processing control plane messages for a first data center fabric switching element. The system includes a first port for communicating at least a first control plane message for processing by the first control plane daemon.

Abstract: A method is for testing the structural integrity of a metal joint such as a weld. The method includes applying stress to the metal joint, and measuring a resistance of a circuit including the metal joint during application of the stress to the metal joint. A structural integrity of the metal joint is determined by comparing the measured resistance with a baseline resistance.

Abstract: A system for managing a cellular network implemented based on O-RAN standards includes an O-DU for generating a first control-plane message requesting a first set of radio resources responsive to a scheduled uplink transmission from a user device, where the first set of radio resources includes an assigned portion of a carrier signal allocated for the uplink transmission; an interposer unit for receiving the first control-plane message, and generating a second control-plane message requesting a second set of radio resources including a remaining portion of the carrier signal; and an O-RU for receiving the first and second control-plane messages, receiving the uplink transmission, and generating user-plane message(s) including first and second digitized data correlated with the first and second control-plane messages. The interposer unit sends the first digitized data to the O-DU without sending the second digitized data, and monitors the carrier signal using the first and second digitized data.

Abstract: A system and method are provided for making time domain measurements of a wideband periodic radio frequency (RF) signal using a narrowband measurement instrument operating in a frequency domain. The method includes receiving the periodic RF signal at a single port corresponding to a receiver of the measurement instrument; determining a complex absolute signal having amplitudes and phases of spectral components of the periodic RF signal over an entire bandwidth of the periodic RF signal in the frequency domain; and reconstructing a time domain signal corresponding to the periodic RF signal by transforming the complex absolute signal from the frequency domain to the time domain.

Abstract: A system and method are provided to determine at least one of equivalent isotropic radiated power (EIRP) or effective isotropic sensitivity (EIS) of an antenna under test (AUT) in a test chamber, the AUT including an antenna array with an array phase center that is offset from a center of a quiet zone of the test chamber. The method includes performing a local beam peak direction scan of an antenna pattern of the AUT using a probe antenna located at laterally offset positions at a near-field distance from the AUT to determine a beam peak direction; performing EIRP and/or EIS near-field measurements of the AUT in the determined beam peak direction using the probe antenna located at near-field distances from the AUT in a radial direction; deriving a far-field equivalent of the EIRP and/or EIS near-field measurement along the determined beam peak direction; and deriving the beam peak direction of the AUT.

Abstract: A system for detecting changes in an electronic component and a method for operating a data processing system for finding events that predict an electronic component's failure are disclosed. The system includes an input port that receives a data stream that includes an ordered sequence of data values generated by the electronic component. A controller identifies a segment of the data stream (EDS), transforms the EDS to a CSV, and compares the CSV to a plurality of reference signature vectors (RSVs) to determine if the CSV is similar to any of the RSVs. Information identifying a new CSV is stored in an RSV database if the new CSV is similar to one of the RSVs, and a new RSV is created if the new CSV is not similar to any of the RSVs in said RSV database. A predictor RSV that occurs as the electronic component ages is identified.

Abstract: A real-time spectrum analyzer (RTSA) includes an analog-to-digital converter (ADC) configured to convert in real-time an input analog signal into a digital input data stream, a digital down-converter (DDC) configured to down-convert in real-time the digital input data stream into a down-converted input data stream, a fast Fourier transform (FFT) unit configured to generate in real-time FFTs of the down-converted input data stream, an acquisition memory circuit configured to store in real-time the FFTs generated by the FFT unit, and an analyzer configured to read in non-real time the FFTs stored in the acquisition memory.

Abstract: Methods, systems, and computer readable media for conducting a network traffic simulation using hypertext transfer protocol (HTTP) archive (HAR) data are disclosed. One method includes receiving HAR file information generated by a web client entity in a test environment, utilizing at least a portion of the HAR file information to generate one or more HTTP transaction test definitions, and utilizing the one or more HTTP transaction test definitions to generate an associated web application server emulation used for performing a test on a system under test (SUT). The method further includes utilizing the web application server emulation to generate a plurality of test packets and generating associated performance metric data representative of the SUT in response to the SUT processing the plurality of test packets.

Abstract: A miniature radar target simulator (MRTS) and a system comprising a plurality of MRTS's are described. The MRTS and system are useful for emulating echo signals for a radar DUT with reduced interference. Illustrative radar test systems desirably generate the intended (emulated) radar targets and reduce unwanted (“ghost”) signals, which can result in “ghost targets,” and errant/ambient electromagnetic radiation that reduces the performance and reliability of known re-illuminators and systems including same.

Abstract: Methods, systems, and computer readable media for network traffic generation using machine learning. An example method includes collecting first traffic from a production data center environment. At least a portion of the first traffic comprises live computer network traffic transiting the production data center environment. The method includes collecting second traffic from an emulated data center testbed device. At least a portion of the second traffic comprises testbed traffic that transits an emulated data center switching fabric of the emulated data center testbed device. The method includes training a traffic generation inference engine using the first traffic and the second traffic. The method includes generating, using the traffic generation inference engine, test traffic to test or stimulate a network system under test (SUT).