Abstract: A controller includes a memory, a processor, and a first interface to a clock recovery unit that provides a recovered clock. When executed by the processor, instructions from the memory cause the controller to: instruct, via the first interface, the clock recovery unit at a first loop bandwidth to provide the recovered clock to a signal sampler; instruct, via the first interface, the clock recovery unit at a second loop bandwidth wider than the first loop bandwidth, to provide the recovered clock to the signal sampler; compare measurements from the signal sampler at the first loop bandwidth to measurements from the signal sampler at the second loop bandwidth; and instruct, via the first interface, the clock recovery unit at a third loop bandwidth to provide the recovered clock to the signal sampler applying adjustments based on comparing the measurements.

Abstract: A method for selectively processing a packet flow using a flow inspection engine is disclosed. The method includes receiving, by at least one hardware data plane processor component in a network packet broker, a plurality of packets associated with a packet flow, and forwarding, by the at least one hardware data plane processor component to at least one flow inspection engine, a copy of at least a portion of one or more of the initial packets of the packet flow.

Abstract: Methods, systems, and computer readable media for recycling background traffic in a test environment are disclosed. One example method occurs at a test system implemented using at least one processor, the method comprising: generating background packets usable as background traffic in a data center switching fabric used in delivering test traffic to a system under test (SUT); sending, from a first packet source of the test system and via the data center switching fabric, the background packets toward a first packet destination of the test system; receiving, by the first packet destination, at least some of the background packets; and resending, from a re-entry packet source of the test system and via the data center switching fabric, at least one received background packet toward the first packet destination or a second packet destination.

Abstract: The subject matter described herein includes methods, systems, and computer readable media for improving remote direct memory access (RDMA) performance. A method for improving RDMA performance occurs at an RDMA node utilizing a user space and a kernel space for executing software. The method includes posting, by an application executing in the user space, an RDMA work request including a data element indicating a plurality of RDMA requests associated with the RDMA work request to be generated by software executing in the kernel space; and generating and sending, by the software executing in the kernel space, the plurality of RDMA requests to or via a system under test (SUT).

Abstract: Methods, systems, and computer readable media for active testing and monitoring a radio access network and core network. An example system includes test probes placed in the network, including at least a first probe on a device configured for communicating on a radio access network of the network and a second probe in a data network of the network or coupled to the data network. The system includes a radio access test system configured for capturing one or more air interface measurements on the radio access network of the network. The system includes a test manager configured for executing a test script for active testing and monitoring of the network including attributing an end-to-end latency to the radio access network and the data network based on at least one air interface measurement from the radio access test system.

Abstract: Methods, systems, and computer readable media for processing QUIC communications in a network. An example system includes a first network interface for receiving a QUIC connection request from a first node in the network and, in response, establishing a first QUIC connection between the first node and the system. The system includes a QUIC processing module configured for receiving, via the first QUIC connection, encrypted QUIC data including a number of streams and decrypting the encrypted QUIC data, resulting in decrypted QUIC data. The QUIC processing module is configured for extracting each of the streams from the decrypted QUIC data, resulting in a plurality of extracted streams, and packaging at least one of the extracted streams into a non-QUIC protocol format, resulting in at least one packaged stream. The system includes a second network interface for transmitting the packaged stream to a second node in the network.

Abstract: A device for generating a sampling strobe, which controls a sampling device to sample an input signal, includes a phase shifter configured to phase shift an input clock to provide multiple phase shifted input clock signals; and aperture generating circuits configured to generate sampling clock signals from the phase shifted input clock signals, respectively, by adjusting duty cycles of the phase shifted input clock signals to provide sampling pulses having desired pulse widths, where for each sampling clock signal of the sampling clock signals, a rising edge and a falling edge of each sampling pulse originate from the same input edge of the input clock; and apply the sampling clock signals to interleaved samplers of the sampling device, respectively, for controlling sampling of the input signal by integrating according to the desired pulse widths of the sampling pulses, where the desired pulse widths correspond to sampling apertures.

Abstract: One method occurs at an impairment test system.

Abstract: Methods, systems, and computer readable media for testing video streaming on a wireless network. An example method includes receiving selection of a video streaming resource for streaming on the wireless network. The method includes recording, at a mobile device, one or more test samples of the video streaming resource streamed over the wireless network. The method includes recording, at a test system, one or more reference samples of the video streaming resource streamed over a wired network distinct from the wireless network. The method includes calculating one or more quality of experience (QoE) performance indicators for video streaming of the video streaming resource on the wireless network by comparing the test samples and the reference samples of the video streaming resource.

Abstract: A system for determining optical probe location relative to a photonic integrated circuit (PIC) is described. A diffractive optical element (DOE) disposed in the PIC, and has a focal point of absolute maximum reflection at location having coordinates in three-dimensions above the PIC. The system includes an optical waveguide probe, and an optical source adapted to provide light through the optical waveguide probe and incident on the DOE. The DOE reflects and focuses light back to the optical waveguide probe, and a power meter is adapted to receive at least a portion of the light reflected and focused at the focal point above the PIC. Based on the determination of a location of the absolute maximum reflection, consistent and reliable testing of PIC can be achieved.

Abstract: Systems and components for testing a light detection and ranging (LIDAR) device under test (DUT) are described. In one example, an ellipsoid is adapted to receive the LIDAR DUT at a first focal point, where light transmitted from the LIDAR DUT is incident on the second focal point. In another example a plurality of optical waveguides arranged in at least a portion of a circle, and the plurality of optical waveguides are adapted to receive light from the LIDAR DUT. In another example, a LIDAR distance simulator is adapted to receive an optical input, and includes optical switches that are selectively connected to one of a plurality of optical delay devices to an input of the one of a plurality of optical input channels. Illustrative delay elements may be realized through optical delay elements or a combination of optical and electrical delay elements.

Abstract: A method is provided for decompressing wide word data compressed in parallel. The method includes creating an instance of memory structure for a wide word in the wide word data, where the instance of memory structure is an inverse of a compression dictionary for the wide word; retrieving multiple compressed codes iteratively from a gap-free compressed output stream of the wide word data using the instance of memory structure, where each compressed code includes at least one character code and a reverse-pointer, and where at least one compressed code includes a multi-symbol string having a multiple character codes; forming an intermediate decompressed output stream by iteratively following the reverse-pointers for the multiple compressed codes, respectively; and forming decompressed output stream by reversing an order of the character codes in the multi-symbol string of the at least one compressed code.

Abstract: An oscilloscope includes a memory that stores instructions; and a processor that executes the instructions. When executed by the processor, the instructions cause the oscilloscope to obtain a measurement of a first radio frequency signal; split a first spectrum based on the first radio frequency signal into a first low-frequency band and a first high-frequency band; perform a first Fourier transform to compute a first new spectrum based on the first spectrum; compute a first waveform of the first new spectrum with noise of the oscilloscope reduced by performing a first inverse Fourier transform based on the first new spectrum; and combine the first new spectrum with noise of the oscilloscope reduced with the first low-frequency band.

Abstract: An apparatus and a system measure electrical power with improved accuracy as a result of compensating for sources of thermal energy that are not caused by the electrical power of the electrical circuit under test. The apparatuses and systems provide a separate electrical signal source (e.g. RF electrical circuits under test) and DC sides. The apparatuses and systems include devices adapted to convert thermal energy into voltages having reversed polarities. The apparatuses and systems are adapted to compensate for temperature changes not caused by the electrical power of the electrical circuit under test (e.g., ambient temperature change and thermal energy transmitted through the signal transmission lines from sources in the electrical circuit).

Abstract: The subject matter described herein includes methods, systems, and computer readable media for non-intrusive queue analysis. A method for non-intrusive queue analysis occurs at a test analyzer of a test system, the test analyzer for analyzing packet queue performance of a system under test (SUT). The method comprising: receiving, via at least one mirrored ingress port of the SUT, a plurality of copied ingress test packets; receiving, via at least one mirrored egress port of the SUT, a plurality of copied egress test packets; correlating, using a correlation technique, the plurality of copied ingress test packets and the plurality of copied egress test packets; and generating, using the correlated packets, at least one packet queue performance metric associated with the SUT.

Abstract: A method determines corrected TRP or TIS of an AUT in a near-field test chamber, the AUT having a phase center offset from a rotation center of the test chamber. The method includes performing EIRP or EIS measurements of the AUT at first sampling grid points on a first closed-surface geometric shape centered at the rotation center; mapping second sampling grid points to the first closed-surface geometric shape to provide mapped sampling grid points on the first closed-surface geometric shape, where the second sampling grid points are on a second closed-surface geometric shape centered at the phase center of the AUT; determining estimated EIRPs or EISs at the mapped sampling grid points using the EIRP or EIS measurements; scaling the estimated EIRPs or EISs at the mapped sampling grid points to provide scaled EIRPs or EISs; and calculating the corrected TRP or TIS based on the scaled EIRPs or EISs.

Abstract: An apparatus automatically positions an optical test module relative to a Lidar sensor during a target simulation test of the Lidar sensor. The apparatus includes a sensor platform configured to support a Lidar sensor, and a test module platform configured to support an optical test module such that an optical window of the optical test module faces in a direction towards the Lidar sensor supported by the sensor platform.

Abstract: An optical device having a wavelength measurement section and an SMRS measurement section is disclosed. The wavelength measurement section includes a MZI, which includes first optical waveguides having a first optical path length difference. The wavelength measurement section also includes a second MZI, which includes second optical waveguides having a second optical path length difference. The second optical path length difference is greater than the first optical path length difference. The SMRS includes a filter adapted to suppress a primary laser mode of the second output optical signal and to pass a remaining portion of the second output signal to determine an SMRS based on an optical power of the main laser mode from the wavelength and power measurement stage, and an optical power of the remaining portion of the second output optical signal.

Abstract: Methods, systems, and computer readable media for measuring data integrity in time sensitive networks. An example method for testing a time sensitive network (TSN) device includes calculating a data integrity value for a preemptable frame. The method includes appending the data integrity value to an end of the preemptable frame and transmitting the preemptable frame to the TSN device, causing the TSN device to fragment the preemptable frame or to reassemble the preemptable frame after fragmentation. The method includes receiving the preemptable frame after traversing the TSN device and validating the data integrity value of the preemptable frame after traversing the TSN device.

Abstract: A method for injecting a test plugin into a user-space network protocol stack executing on a device under test (DUT) and executing the test plugin during testing of the DUT includes transmitting, from a test system and to a first DUT, a first test plugin. The method further includes injecting the first test plugin into a user-space network protocol stack executing on the first DUT while the user-space network protocol stack is executing. The method further includes executing the first test plugin. The method further includes, while the first test plugin is executing, transmitting test packets to the DUT and receiving packets from the DUT. The method further includes reporting, from the DUT and to the test system, results generated from execution of the first test plugin.