A distribution system that includes central ports connected by lines to respective remote ports includes a visual identification system that enables either identifying the central ports connected with selected remote ports, or identifying the remote ports connected with selected central ports. The visual identification system includes signal paths extending between the central and remote ports. The signal paths are connected to output devices that generate visual, auditory, or tactile feedback to identify the ports. The signal paths operate independently of the lines connecting the ports.

Systems and methods for detecting data in a received multiple-input-multiple-output signal are provided. N signals are received from N respective antennas, where the received signals are associated with (i) M sets of data values, (ii) a set of symbols, and (iii) a set of carrier frequencies. The N signals are formed into a received signal vector y, and one or more transformations are performed on the received signal vector y to obtain a transformed vector. A plurality of samples are formed from the transformed vector. For samples of the plurality of samples, a data detection technique of a plurality of data detection techniques is selected. The selecting is based on at least one of a spatial stream, a symbol, and a carrier frequency associated with the given sample. The selected data detection, technique is used to detect data of the given sample.

Some embodiments include a system for simulating electromagnetic environments that includes a channel emulator having a plurality of outputs, each output associated with a different operational path. Each operational path has a power amplifier, an antenna and a first coupling mechanism. The power amplifier is coupled to an output of the channel emulator. The antenna is in communication with a test region of the apparatus. The first coupling mechanism simultaneously couples power to the antenna and to a first measurement path when the operational path is coupled to the test region, so that a calibration state of the operational path can be determined and adjusted without interruption of a signal coupled to the antenna in the operational path.

A system for a backplane serializer/deserializer (SerDes) including first and second integrated circuits (IC). The first and second ICs include transmitters and receivers coupled to each other through first and second bidirectional links. A first receiver is configured to receive first data at a data rate on a first channel supported by both the first bidirectional link and the second bidirectional link. A second receiver is configured to receive second data at the data rate on a second channel supported by both the first bidirectional link and the second bidirectional link. The backplane SerDes is configured to transfer the first and second data in full duplex mode by employing two-bit pulse-amplitude modulation (PAM-4) to reduce signaling speed of the first and second bidirectional links without reducing throughput of a lane pair including the first and second channels.

Metric anomaly detection techniques in a digital medium environment are described. An input time interval is identified by an analytics system for the presence of an anomaly of a metric. Inclusion of a scheduled event in the input time interval is identified, and a historical time interval is determined that also includes the scheduled event. Usage data describing values of the metric is then obtained for both the input time interval and the historical time interval. The usage data corresponding to the input time interval is then compared with the usage data corresponding to the historical time interval to detect effects of the scheduled event and whether the input time interval includes an anomaly in the metric.

Method and arrangement for displaying a digital waveform in an eye diagram simultaneously with an indication of acceptability of the digital waveform. A decoded digital waveform is separated into overlapping waveform permutations based on a number of digital states and transition points in the eye diagram. Submasks equal in number to the waveform permutations and that are derived from a common, known good waveform, are retrieved from a memory component. Each retrieved submask is applied to a corresponding waveform permutation to determine any locations at which the waveform permutation exceeds a boundary of the submask. Only one submask is applied to each waveform permutation. The waveform is displayed in the eye diagram simultaneous with a visual indication of the locations at which any of the waveform permutations exceeds the boundary of the corresponding submask, to enable visual assessment of the acceptability/validity of the digital waveform.

A networking device testing system includes a testing device that is connected to a load generator device and a networking device. The testing device includes a testing device chassis. First testing device connectors are included on the testing device chassis and are each connected to a respective networking device connectors on the networking device. Pairs of the first testing device connectors are coupled together such that traffic received through one of the first testing device connectors in each pair is directed to the other of the first testing device connectors in each pair. Second testing device connectors are included on the testing device chassis. At least one of the second testing device connectors is connected to the load generator device. Each of the second testing device connectors is coupled to a respective one of the first testing device connectors.

A receiver and method for using the same to generate phase spectra that are independent of the starting time of the sequence of digital measurements used to generate the phase spectra are disclosed. The receiver includes a first signal port adapted to receive a first test signal that includes a plurality of tones and a first ADC that generates one digital value from the first test signal in response to each clock pulse from an ADC clock. The first receiver also includes a phase clock register that includes a time stamp value that is incremented on each clock pulse from the ADC clock, and a processor that records a sequence of the digital values starting at a first time and the time stamp value at the first time.

Systems, apparatuses, and associated methods are provided for testing, analyzing, and assembling radiofrequency (RF) modules. An example system includes a test station for testing an RF module, including testing mechanical, chemical, and/or electrical parameters of the RF module. The testing may involve various sources of error, and the system determines one or more types of error from the test results as well as how to address the error. From completed testing, test results may be utilized in view of expected test results to improve simulations and to determine how two or more RF module may be combined in an RF assembly.

An integrated circuit (IC) for a backplane serializer/deserializer (SerDes) system, comprising a first transmitter configured to send first data at a data rate to a second receiver in a second IC, a first receiver configured to receive second data at the data rate from a second transmitter in the second IC, wherein each of a first link and a second link is to the first transmitter, the first receiver, the second transmitter, and the second receiver, and wherein both the first link and the second link combined are configured to transfer the first data from the first transmitter to the second receiver and transfer the second data from the second transmitter to the first receiver at the data rate.