Disclosed herein are devices and methods to facilitate compensating for intra-pair skew in a high-definition multimedia interface (HDMI) system. One or more skew training pattern may be transmitted on a signal line including a differential pair. Acknowledgment of receiving the skew training pattern may be received on a display data channel (DDC) associated with HDMI system. The skew training pattern may be used to ascertain and compensate for intra-pair skew.

A method and apparatus of a device that determines transmit and receive skew times between pairs of lanes of an electrical interface of a network element is described. In an exemplary embodiment, the device couple an optical loopback to transmit and receive interfaces of an optical interface, the optical loopback capable of transporting a first optical signal with a plurality of polarization and quadrature combinations. In addition, the device determines the receive skew time by transmitting a second optical signal on the optical loopback with one of the plurality of polarization and quadrature combinations. Furthermore, the device determines the transmit skew time by, tuning transmission delays on the transmit interface for a third optical signal with components corresponding to a pair of the plurality of polarization and quadrature combinations such that the third optical signal is recoverable on the receive interface.

Methods and systems for an optoelectronic built-in self-test (BIST) system for silicon photonics optical transceivers may include an optoelectronic transceiver having a transmit (Tx) path and a receive (Rx) path, where the Rx path includes a main Rx path and a BIST loopback path. The system may generate a pseudo-random bit sequence (PRBS) signal, generate an optical signal in the Tx path by applying the PRBS signal to a modulator, communicate the optical signal to the BIST loopback path and convert the optical signal to an electrical signal utilizing a photodetector, where the photodetector is a replica of a photodetector in the main Rx path, and assess the performance of the Tx and Rx paths by extracting a PRBS signal from the electrical signal. The transceiver may be on a single complementary-metal oxide semiconductor (CMOS) die, or on two CMOS die where a first comprises electronic devices and a second comprises optical devices.

A device includes a transmitter coupled to a node, where the node is to couple to a wired link. The transmitter has a plurality of modes of operation including a calibration mode in which a range of communication data rates over the wired link is determined in accordance with a voltage margin corresponding to the wired link at a predetermined error rate. The range of communication data rates includes a maximum data rate, which can be a non-integer multiple of an initial data rate.

In coverage enhancement of machine type communication (MTC), a downlink transmitted bit stream is jointly encoded with uplink payload by the terminal. The combined signal is sent on uplink, to be jointly decoded by the base station that knows the downlink payload and the joint encoding mechanism at the mobile terminal.

This application relates to the field of communications technologies, and in particular, to a digital predistortion processing method and apparatus. This application provides a digital predistortion processing method and apparatus. Digital predistortion processing of a multichannel power amplifier is supported through deprecoding processing by using one feedback link and one digital predistortion processor. In addition, after being amplified by a power amplifier, a precoded signal is fed back to the feedback link for predistortion parameter calculation, to improve quality of a transmit signal. The digital predistortion processing method and apparatus that are provided in embodiments of this application are intended to improve output linearity and efficiency of a multi-transmit-channel power amplifier while reducing implementation costs and complexity of a transmit device, and further improve overall system performance.

Systems, methods, and storage media for detecting a security intrusion of a network device are disclosed. Exemplary implementations may include a method involving, in the network device including a processor, monitor a light signal associated with a security enabled port of the network device; and in response to detecting a change in the light signal, initiate a security alert.

A method for testing a vehicle-to-X communication module by means of a diagnostic device as well as an associated vehicle-to-X communication module and an associated diagnostic device. During a test mode messages are exchanged between the vehicle-to-X communication module and the diagnostic device, and evaluated in order to detect errors.

Embodiments of a method and a device are disclosed. In an embodiment, a method for performing physical layer operations at a network node in a communications network is disclosed. In an embodiment, the method involves identifying a fault status at the network node, embedding an indication of the fault status into a bit stream at the physical layer of the network node, and transmitting the bit stream from the network node. In an embodiment, embedding an indication of the fault status into a bit stream at the physical layer includes embedding an operations, administration, and management (OAM) word into the bit stream to communicate the indication of the fault status.

A test instrument or host device can apply inverse transmitter and receiver functions to data transmitted or received by an electrical and optical transponder. The inverse transmitter and receiver functions are applied to counteract internal signal conversion processes of the transponder. Forward error correction and test pattern analysis may be performed on signals received from the transponder after the inverse receiver function is applied to the received signals.