43results about How to "Implementation Latency" patented technology

The invention provides a high speed full optical Orthogonal Frequency Division Multiplexing (OFDM) system and a modulation / demodulation method thereof. In the method, a laser generates an ultrashort pulse signal which is then modulated according to a certain modulation code sequence; the pulse series of the modulation signal and the ultrashort pulse signal are synchronized through an electrically adjustable delay line; the modulated signal is divided into two ways of signals through a first coupler; the two ways of signals are multiplexed respectively through a first multiplexer and a second multiplexer; the multiplexed signals are integrated through a second coupler; and the integrated signals are demultiplexed through a de-multiplexer. By using the high speed signal processing technique in optical fiber, the system and the method realize the full optical domain OFDM modulation and demodulation, thus obtaining greater operation bandwidth and higher processing speed.

A differential input failsafe circuit is disclosed that detects and signals a failsafe condition if a combination of a missing or too low differential signal and a frequency below a frequency limit is detected. The output signal from the fail-safe circuit is held in a given state which is an invalid representation of the differential input signal. Fail-safe conditions are detected using a frequency detector, complementary offset auxiliary amplifier with limited frequency roll-off. In addition, using a delay circuit requires that the fail-safe condition exists for a period of time before the fail-safe circuit is activated. Initialization circuitry ensures proper power-up conditions, enabling the circuitry to detect a fail-safe condition and, regardless of the previous state of the signal, ensure a reliable fail-safe.

The invention provides a multi-mode mobile satellite communication verification system and verification method. The system comprises a terminal simulator, a user link channel simulator, a receiving multi-beam antenna simulator, a return link processor, a subband exchange processor, a signal regeneration processor, a forward link processor, a transmitting multi-beam antenna simulator, a feeder link channel simulator, a gateway station simulator and a control center, a user segment, a space segment, a ground segment and a mobile satellite communication channel of a mobile satellite communication system are separately simulated. The system can perform demonstration verification on the link performance and the business ability of the mobile satellite communication system adopting a plurality of satellite-borne processing modes and multiple communication systems, and solves the problem that related verification system and method is lacked at present and technical feasibility verification cannot be provided for engineering application. Meanwhile, the invention further discloses a verification method of the verification system.

The present invention discloses a grading control computer system based on the optical packet switch and optical multicast, including at least two groups of CPUs (A), and optical interconnection switching devices linked between the CPUs (A). The optical interconnection switching devices include at least a first level node (1) and a second level node (2). The current HPCS usaully takes use of the centralized control mode: each port has to send the request signals to a central dispatcher after it generates a business, and if the distance is longer, it may introduce a trip delay having a larger request and answer signal. The present invention adopts a grading controlled management style, in which the node is only needed sent requests to the local control unit, thus it can greatly reduce such delay, and at the same time, can reduce the storage and computing pressure of each level control unit.

The invention relates to a low-latency end-to-end communication method based on a CAN bus, comprising the following steps: connecting a plurality of bay layer devices and a CAN communication gateway through a CAN bus; PHY Ethernet port or 5G module connection; the low latency is the connection of microsecond-level delay; when the interval layer device communicates with the CAN communication gateway, the priority is automatically converted or the CAN load is intelligently adjusted. rate method, so that the communication delay is less than 5ms. The invention applies the standard CAN bus hardware bottom layer protocol, formulates the standard protocol for the application layer, and realizes "low delay" and "end-to-end" communication characteristics by embedding CPU software and hardware optimization, and can also solve the "last mile communication" data high-speed Communication problems.

The invention provides a miniaturized tunablebroadband stable-phase optical fiberdelay line. The miniaturized tunablebroadband stable-phase optical fiberdelay line comprises a first low-noise microwaveamplifier, a broadbanddirectly modulated laser, an optical circulator, a first single mode fiber, a first magneto-optical switch, a second single mode fiber, a first fiber reflecting mirror, a second magneto-optical switch, a third single mode fiber, a second fiber reflecting mirror, a third fiber reflecting mirror, a broadbandphotoelectric detector and a second low-noise microwaveamplifier. The problem that a traditional optical fiberdelay line is sensitive to temperature change and transmissionbroadbandmicrowave signalphase drift is severe is mainly solved. In addition, the problem that an active temperature control or feedback compensation type optical fiber stable-phasedelay line is cumbersome, complicated in structure and poor in repeatability is also solved.

The invention provides a method for measuring performance of an Ethernet. The method comprises the following steps: sending a performance measurement request message to a second MEP by a first MEP, wherein the message comprises a first performance measurement parameter; receiving a first performance measurement response message sent by the second MEP, wherein the first performance measurement response message carries a third performance measurement parameter and a fourth performance measurement parameter; receiving a second performance measurement response message sent by a first MIP, wherein the second performance measurement response message carries a first performance measurement parameter, a second performance measurement parameter and a fifth performance measurement parameter; after receiving the first performance measurement response message and the second performance measurement response message, recording a sixth performance measurement parameter; calculating performance parameters between the first MEP and the second MEP and the performance parameters between the first MEP and the MIP according to the performance measurement parameters. By virtue of the method, device and system provided by the embodiment, measurement on packet loss, time delay and jitter performance of each node on a service path can be finished at a time and multiple times of measurement for subregions are not needed.

The invention discloses a network performance measuring method, apparatus and system. The method is used for measuring the network performance parameters of the communication link between a first device and a second device. The first device is configured to be a control client and a session initiating side to implement the TWAMP, and the second device is configured to a server and a session response side to implement the TWAMP. The network performance measuring method is applied to the first device and includes creating the TWAMP type SLA work after a work creation command is received; starting to schedule the TWAMP type SLA work after the starting work scheduling command is received; by scheduling the TWAMP type SLA work to realize the following operation: negotiating with the second device the UDP port number used in the interactive testing of messages; interactively testing the messages with the UDP port determined by the negotiation and the second device; and measuring the network performance parameters according to the interactive testing messages.