154 results about "Twisted pair" patented technology

The invention provides an analysis method and device for flow, efficiency and water consumption rate of a hydraulic power plant generator set. A distributed flow measurement unit based on a domestic PLC controller and a domestic operating system is constructed, and each unit is independently configured with the flow measurement unit to realize decentralization of data acquisition and processing; active power, guide vane opening, water head difference, instantaneous flow and volute inlet pressure data are collected in real time through a distributed flow measurement unit, and a unit efficiency and water consumption rate calculation model is dynamically fitted based on the data; sending an output result of the calculation model to a monitoring system through an anti-interference communication network, wherein the communication network adopts layered wiring and a double-shielded twisted pair to reduce the signal bit error rate; and the IMC integrated management and control platform is used for remote monitoring and diagnosis of the flow measurement unit, and seamless connection with a smart power plant data medium station is realized. The system reliability and the maintenance flexibility are improved, and the autonomous controllable requirements of domestic substitution and intelligent power plants are comprehensively met.

The invention discloses a twisted pair crimping system and a twisted pair crimping method. The twisted pair crimping system comprises a cable clamp used for clamping and fixing a twisted pair, and each conductor core of the twisted pair comprises a plurality of conductive wires twisted together; the moving device is used for moving the cable clamp and the twisted pair in the horizontal direction perpendicular to the axial direction of the twisted pair; and the artificial intelligence visual device is arranged at the detection station and can simulate human eyes to identify the actual number of the conductive wires of each conductor core of the twisted pair. And when the artificial intelligence visual device recognizes that the actual number of the conductive wires of the conductor core is not equal to the preset number, the artificial intelligence visual device judges that the twisted pair is unqualified. According to the invention, the artificial intelligence visual device can simulate human eyes to identify the actual number of the conductive wires in the conductor core of the twisted pair. Therefore, whether the quality of the twisted pair is qualified or not can be judged in advance according to the identified actual number of the conductive wires in the conductor core, and the quality of the twisted pair product is improved.

The invention discloses a twisted pair crimping system and a twisted pair crimping method. The twisted pair crimping system comprises a cable clamp used for clamping and fixing a twisted pair; the moving device is used for moving the twisted pair; the artificial intelligence visual device can simulate human eyes to identify the actual positions of the geometric centers of the two conductor cores of the twisted pair moved to the detection station and the actual distance between the geometric centers of the two conductor cores; the position calibration device is suitable for calibrating the crimping position of the twisted pair according to the position deviation between the actual position and the preset ideal position when the actual distance is not smaller than the preset safety distance, so as to eliminate the position deviation; and the crimping device is arranged at the crimping station and is used for crimping the conductor core onto the terminal. When the conductor core is moved to a predetermined crimping position, a geometric center of the conductor core is located on a centerline of the terminal. According to the invention, the crimping position of the conductor core of the twisted pair can be calibrated according to the identified position deviation, and the crimping precision and quality of the twisted pair are improved.

The utility model provides a portable twisted pair twisting device. The portable twisted pair twisting device comprises a shell, a driving assembly arranged in the shell, a clamping assembly and a manual opening and closing assembly, the clamping assembly and the manual opening and closing assembly are arranged outside the shell, the manual opening and closing assembly controls the clamping assembly to perform opening and closing actions, and the driving assembly controls the clamping assembly to perform circumferential rotation actions. The manual opening and closing assembly and the driving assembly can control the clamping assembly to act independently or cooperatively. The portable twisted pair twisting device provided by the utility model solves the problems of low efficiency and easy finger scratching of the existing twisted pair untwisting mode.

The invention belongs to the technical field of synchronous control, and particularly relates to a synchronous control system and method for vibration suppression and quality monitoring of twisted pairs, and the method comprises the following steps: S1, obtaining the measurement data of an acceleration sensor and a laser displacement sensor array on a twisted pair production line, a real-time vibration vector field of the twisted pair in the monitoring area is constructed through data fusion; based on the real-time vibration vector field, utilizing a Hamiltonian agent model to predict the vibration energy state of the twisted pair in a future prediction time window; and S2, adjusting a weight coefficient for minimizing the weighted sum of the predicted vibration energy and the control increment norm in real time according to the twisting quality characteristic index calculated in the previous control period. According to the method, conversion from passive response to active predictive suppression is realized, optimal control measures can be taken before vibration deterioration, and the timeliness of vibration suppression is improved.

The utility model discloses a flexible high frequency data cable, include: conductor, the extrusion of conductor has PE insulating layer and forms core, is provided with foamed layer on PE insulating layer, the thickness of foamed layer accounts for 75% of PE insulating layer total thickness, and the foaming rate of foamed layer is 60%~65%, and every two core wire pairs form a pair of double -twisted pair, and the twisting pitch of every pair of double -twisted pair is different, and the aluminium -plastic composite tape is wrapped on double -twisted pair, and four pairs of double -twisted pair with aluminium -plastic composite tape are twisted into cable core, and the overlap gap of aluminium -plastic composite tape on each double -twisted pair all faces outward, and the tinned copper wire braid is woven on cable core, and the tinned copper wire braid covers and presses on the overlap gap of aluminium -plastic composite tape, and the weaving density of tinned copper wire braid is 70%, and the tape is wrapped on tinned copper wire braid, and the sheath is extruded on tape. The utility model can prevent the signal crosstalk between double -twisted pair without heat sealing to aluminium -plastic composite tape, thereby protecting PE insulating layer from being damaged.

The utility model relates to the technical field of mutual inductors in electrical equipment, in particular to an integrated sleeve type electronic current transformer. Comprising an insulation packaging structure, a conducting rod, a current measuring module and a capacitance monitoring module, the insulation packaging structure is a fully-sealed sleeve-shaped epoxy resin shell formed by pouring epoxy resin, a wiring platform is arranged on the side face of the epoxy resin shell, the conducting rod axially penetrates through the insulation packaging structure, and the two ends of the conducting rod are exposed; the capacitance monitoring module comprises a capacitance wiring terminal and a capacitance induction net, the capacitance induction net sleeves the outer side of the conducting rod, the capacitance induction net and the conducting rod form a monitoring capacitor, and the capacitance wiring terminal is arranged on the wiring platform and is connected with the capacitance induction net; the current measuring module comprises a coil device body and a current shielding twisted pair, the coil device body is sleeved on the outer side of the capacitance induction net, and the current shielding twisted pair is connected with the coil device body. The current measuring and capacitance state monitoring device integrates functions of current measurement and capacitance state monitoring, and is highly compact in structure and low in cost.

The invention discloses a subminiature three-coaxial differential self-locking high-temperature-resistant assembly and a connector, and relates to the technical field of radio frequency connectors, the subminiature three-coaxial differential self-locking high-temperature-resistant assembly comprises a shell, an outer shield is arranged in the shell, an outer insulator is arranged on the inner side of the outer shield, and an inner shield is arranged on the inner side of the outer insulator. According to the subminiature three-coaxial differential self-locking high-temperature-resistant assembly and the connector, efficient electromagnetic isolation is formed by the double shielding layers composed of the outer shielding layer and the inner shielding layer and the inner conductor, radio frequency leakage and signal crosstalk can be remarkably inhibited through cooperative use of the structures, the problem that a traditional double-coaxial structure is insufficient in shielding is solved, and meanwhile, the connector is high in reliability. The inner shielding layer and the outer shielding layer of the twisted pair are respectively welded with the inner shielding layer and the outer shielding layer, the continuity of the shielding effect is ensured, the connecting seat is made by sintering glass powder and is provided with a conductive silver powder sealing ring, the stability at high temperature is ensured, good grounding continuity is also provided, and the overall electromagnetic compatibility performance is further enhanced.

This invention provides a single-ended impedance detection method for conductive cables based on current source excitation, applicable to detecting the resistance and self-inductance of conductive cables of any material, length, and diameter. The method divides the conductive cable into two bundles (e.g., in twisted-pair applications). By injecting a current source excitation signal near the cable end, the voltage and current at the near end are detected, yielding the cable's resistance and self-inductance parameters. This invention eliminates the need for auxiliary components at the load end, accurately obtains cable resistance and self-inductance values, has simple logic, is easy to implement, and can be applied to any power supply system.

The utility model relates to communication cable technical field discloses a kind of super six kinds of unshielded communication cable, comprising: outer sheath, inner sheath and twisted pair, inner sheath inner wall is equipped with inner tooth, inner sheath inside is equipped with cross skeleton, inner sheath and cross skeleton between are equipped with twisted pair, inner sheath outer wall is equipped with outer tooth, outer tooth between is equipped with gap, inner sheath outside is equipped with outer sheath, the outer wall of cross skeleton is equipped with reinforcing rib plate, the recess of the utility model inner tooth can disperse the stress when cable bending, cooperate cross skeleton and reinforcing rib plate, prevent twisted pair displacement or deformation, maintain the long-term stability of transmission characteristic, while the inner tooth of discrete distribution increases the friction of sheath and line pair, promote the tensile capacity of cable whole, applicable to complex wiring environment.

The utility model discloses a digital intelligent monitoring system for voltage of a hydrometallurgy electrolytic bath. The digital intelligent monitoring system comprises an electrolytic bath voltage collector, an electrolytic bath voltage wireless receiving and processing controller, an industrial serial port server, an industrial switch and an upper computer, the electrolytic bath voltage collector and the electrolytic bath voltage wireless receiving and processing controller complete wireless local area networking through a wireless LORA network and are used for data interaction between the electrolytic bath voltage collector and the electrolytic bath voltage wireless receiving and processing controller; the industrial serial port server is connected with the electrolytic bath voltage wireless receiving and processing controller through a twisted-pair signal line and used for communication protocol conversion, and the industrial switch is connected with the industrial serial port server through a network cable and used for data transmission; the upper computer is connected with the industrial serial port server through a network cable and used for uploading the cell voltage data to the upper computer.

The utility model belongs to the technical field of elevator cables, and discloses a fatigue-resistant tensile accompanying communication photoelectric composite transmission cable for an elevator, which comprises a cable jacket, a twisted-pair shielding optical cable is arranged in the cable jacket, a cable sheath is arranged on the outer side of the cable jacket, and a cable sheath is arranged on the outer side of the cable sheath. The inner part of the cable sheath is filled with a power line and an inner ring 1, the inner part of the inner ring 1 is inserted with a steel wire reinforcing line, and the middle part of the outer side of the cable sheath is provided with a tearing groove. According to the elevator cable, the steel wire reinforcing wires can be additionally arranged in the cable sheath and the cable jacket, so that the bending frequency of the elevator cable in the using process is increased, the pulling resistance of the elevator cable is enhanced under the condition of strong displacement, the elevator cable is protected, and the service life is prolonged.

The invention relates to the technical field of cable production equipment, in particular to an intelligent pair-twisting and cabling system of an unshielded horizontal pair-twisted wire network cable, which comprises a cable pair-twisting mechanism, a guide mechanism and a cabling mechanism which are arranged on a machine base, and is characterized in that the machine base is also provided with a driving mechanism for driving the cable pair-twisting mechanism; the pair twisting mechanism comprises two cable racks, a cable wheel, a vertical seat, a pair twisting ring and a tensioning wheel, wherein bearings of the cable wheel are installed on the two cable racks, the vertical seat is arranged on one sides of the two cable racks, and a cable guide wheel is rotationally installed in the vertical seat. According to the intelligent pair-twisting and cabling system for the unshielded horizontal pair-twisted wire network cable, synchronous action of the cable rack and the adjusting mechanism is realized through gear transmission of the driving mechanism and synchronous driving of the transmission shaft, and uniform pitch of a pair-twisted wire core is ensured in cooperation with precise guiding of a pair-twisting ring; dynamic tensioning of the adjusting mechanism is matched with limiting of the linkage structure, cable deviation and abrasion are avoided, the cable core quality is improved, and the transmission performance of the cable is guaranteed.

The invention discloses a manufacturing process of a 10-gigabit Ethernet cable for a vehicle, and belongs to the technical field of cable manufacturing, and the manufacturing process comprises the following steps: 1, processing an oxygen-free copper wire by using a high-strength polycrystalline stranding wire-drawing die to realize surface treatment and outer diameter processing of the oxygen-free copper wire to obtain a conductive wire core; step 2, performing coating processing on the conductive wire core obtained in the step 1 by adopting a foaming PP formula and matching with a nitrogen injection mode, and uniformly forming an insulating protection layer on the surface of the conductive wire core to obtain a high-conductivity wire core; 3, pouring a high polymer material into an extruder, and carrying out coating processing of an insulating layer on the high-conductivity wire core obtained in the step 2 by using the extruder through a special mold to obtain a high-insulation wire; through the mutual cooperation of the twisted pair structure and the plurality of shielding layers, the electromagnetic compatibility of the cable is higher, and through the use of the oxygen-free copper wires, the internal resistance of the cable is reduced, and the twisted pair balance is improved.

A twisted pair cable crimping system includes a cable fixture clamping and fixing a twisted pair cable, each conductor core of a pair of conductor cores of the twisted pair cable has a plurality of fine conductive wires twisted together, a moving device moving the cable fixture and the twisted pair cable in a horizontal direction perpendicular to an axial direction of the twisted pair cable, and an artificial intelligence vision device installed at a detection station and recognizing an actual number of fine conductive wires in each conductor core of the twisted pair cable. The artificial intelligence vision device determines that a quality of the twisted pair cable is unqualified if the actual number of fine conductive wires of at least one conductor core of the pair of conductor cores recognized by the artificial intelligence vision device is not equal to a predetermined number.

The utility model aims at providing a kind of integrated micro electric signal conductor's cable, realize the integration of multiple signal lines, can effectively suppress common mode interference, fully meet the use requirement under the complex electric field environment of power cable inside, realize safe, reliable and efficient signal transmission, solve the problems of many cable quantity in prior art, large space occupation and easy to be interfered with electromagnetic interference.The utility model includes cable core, the outer layer of cable core is cover layer, the cable core includes several electric power conductor and several signal conductor, the signal conductor is embedded in the gap between the electric power conductor, the outer layer of electric power conductor is crosslinked polyethylene structure, the signal conductor includes N pairs of twisted pair wire, each pair of twisted pair wire includes two twisted enameled wire, the outer layer of signal conductor is wound with polyamide imide film.The utility model is applied to the technical field of power cable.

The utility model belongs to the technical field of network cable production and manufacturing, and particularly relates to an anti-interference network cable, which comprises an outer skin layer, a first shielding layer, a buffer layer and a protective layer which are sequentially arranged from outside to inside, a skeleton is arranged in the protective layer, the skeleton divides the interior of the protective layer into at least four accommodating cavities, a group of twisted-pair wire cores are arranged in the accommodating cavities, and the twisted-pair wire cores are sequentially wrapped by an insulating layer and a second shielding layer; the framework comprises four isolation parts, an arc-shaped bayonet is formed between every two adjacent isolation parts, the arc-shaped bayonet is provided with a plurality of clamping parts in contact with the second shielding layer, and the plurality of clamping parts are arranged along the surface of the arc-shaped bayonet. According to the utility model, through optimizing the network cable structure, the anti-interference capability of the network cable can be improved, thereby improving the quality of the network cable.

The invention discloses a Category 6 + follow-up cable and a manufacturing method thereof, the Category 6 + follow-up cable comprises a plurality of Category 6 + communication cable cores and a plurality of reinforcing steel wires, the Category 6 + communication cable cores and the reinforcing steel wires are wrapped by a total sheath, and the Category 6 + communication cable cores and the reinforcing steel wires are arranged side by side and are wrapped by the total sheath to form a flat structure; the category 6 + communication cable core comprises four pairs of paired shielding twisted pairs, and each pair of twisted pairs adopts foamed polyethylene insulation and is coated with an aluminum-plastic composite belt shielding layer; the reinforcing steel wires are galvanized steel wires and are used for enhancing the tensile strength of the cable, compared with the prior art, signal attenuation, dielectric loss and crosstalk between wire pairs are remarkably reduced, the cable has the capability of resisting external electromagnetic interference, torsion and deformation are effectively resisted, and the service life is prolonged; the structure is compact and stable; and the flat design saves the wiring channel space.

The utility model relates to the technical field of elevator cables, and discloses a transparent sheath flat cable, which comprises a flat cable sleeve, and a communication unit and a control unit are arranged in the flat cable sleeve. The communication unit comprises a plurality of cable communication twisted pairs which are arranged in the flat cable sleeve in parallel; each cable communication twisted pair comprises a plurality of communication conductors, the surface of each communication conductor is coated with a first insulating layer, the plurality of communication conductors coated with the first insulating layers are twisted to form a communication wire core, the surface of the communication wire core is provided with a shielding layer, and the surface of the shielding layer is provided with a sheath layer. According to the transparent sheath flat cable, the flat cable sleeve made of the transparent PVC material is arranged to wrap the cable control lines and the cable communication twisted pair in the cable, the transparent appearance effect is achieved, the transparent cable sheath can be used for observing the internal condition of the elevator flat cable at any time, and timely observation and maintenance are facilitated.

The utility model relates to cable technical field, concretely relates to a kind of deep sea anti-cutting waterproof cable, cable core includes inner core and water-blocking ointment layer, kevlar tensile layer and encapsulation layer covered in inner core outside in turn, encapsulation layer is wound in water-blocking ointment layer outside using the way of around or longitudinal package, inner core is by signal core wire and multiple power core wire bundle to be twisted, signal core wire includes signal twisted pair wire and the shielding layer covered in signal twisted pair wire outside, shielding layer is wound in signal twisted pair wire outside using the way of around or longitudinal package, stainless steel armor layer includes multiple stainless steel wires, cable core is arranged in cable center and is twisted with multiple stainless steel wire bundles, sheath is extruded and wrapped in stainless steel armor layer outside.Deep sea anti-cutting waterproof cable can simultaneously realize anti-cutting, waterproof, high-pressure resistance, tensile resistance, corrosion resistance, signal stability and other multiple properties, can adapt to the extreme environment of deep sea, satisfy the long-term reliable operation demand of deep sea exploration, submarine engineering, underwater equipment power supply and communication and other scenes.

The utility model provides a digital leakage ammeter for a wired lightning arrester, and relates to the technical field of ammeters. The ammeter comprises a die-casting aluminum shell, a current acquisition module, a signal processing module and a communication module. According to the ammeter, the current acquisition module is connected with the grounding end of the lightning arrester through a high-voltage lead, and leakage current is acquired in real time. And an output signal of the current acquisition module is transmitted to the signal processing module through the photoelectric isolation interface for conversion and processing. The processed data is connected with an external monitoring terminal by the communication module through an RS-485 communication interface by utilizing a shielded twisted pair, so that remote monitoring and data transmission are realized. The ammeter solves the technical problem of integration of remote high-precision monitoring of the leakage current of the lightning arrester and anti-interference reliable transmission in an outdoor complex environment, and realizes integration of the remote high-precision monitoring of the leakage current of the lightning arrester and the anti-interference reliable transmission in the outdoor complex environment.

The invention discloses a real-time data comparison polymer film quality inspection system, which relates to the technical field of film quality inspection, and comprises a first detection module, a second detection module, a third detection module and a surface defect final inspection module, the four detection modules are sequentially arranged along a conveying path of a polymer film production line and are respectively connected with the central processing unit through shielded twisted pairs, and the central processing unit receives film related data acquired by the four detection modules and processes and analyzes the data through a built-in comparison algorithm. The central processing unit is in signal connection with the real-time database server, the alarm execution module and the visualization module. According to the invention, by installing the four detection modules with complementary functions, the function of multi-dimensional comprehensive detection is realized, synchronous online detection of four key quality indexes of film thickness, components, light transmission and surface defects is realized, the coverage is comprehensive, and a data basis is provided for subsequent data comparison and process adjustment.

The application discloses an enhanced twisted copper line transmission system and an implementation method thereof, which comprises an FPGA and an analog front end matched with the FPGA, the FPGA is configured to comprise a framing / de-framing unit, which is connected with network equipment at a public network or a local area network end through an interface unit; a digital front end unit connected with the analog front end, used for realizing PAM and CAP modulation and demodulation; a SOC subsystem connected with the framing / de-framing unit and the digital front end unit respectively, used for completing link building and state management; and the SOC subsystem adopts an embedded kernel, and a UART serial port of the embedded kernel is a management channel under SDSL technology and SHDSL technology. The application provides an enhanced twisted copper line transmission system and an implementation method thereof, adopts a channel compatibility and algorithm function module multiplexing method, supports two transmission technologies of SDSL and SHDSL, adopts a spread spectrum method, breaks through the limitation of an ITU-G.991.2 SHDSL standard, makes the highest transmission rate not less than 20480 kbit / s, and meets the application requirements of low-speed long-distance and short-distance high-bandwidth of users.

A male terminal assembly for a modular Ethernet connector is disclosed, comprising a plastic housing including a cavity for receiving and positioning a pair of male terminals, and a shield housing disposed at a front end of the plastic housing, the male terminal assembly configured for connection with unshielded twisted pair wire. The male terminal assembly is capable of connecting with unshielded twisted pair wire to form a UTP connector, and because the front of the male terminal assembly has a shield housing, the UTP connector formed thereby is capable of providing the same or similar plug interface as an STP connector.

The invention provides a split type current output temperature sensor. The split type current output temperature sensor comprises a temperature probe assembly (10) and a signal processing assembly (20), the temperature probe assembly (10) comprises a platinum resistor (1), a bolt (5), a temperature probe (6) and a twisted-pair shielded wire (8); a pin of the platinum resistor (1) is connected with one end of the twisted-pair shielded wire (8) and is arranged in the temperature probe (6); a bolt (5) is sleeved outside the temperature probe (6); the other end of the twisted-pair shielding wire (8) is connected with the signal processing assembly (20); the front end of the temperature probe (6) is inserted into a high-temperature measured object and is fixedly connected with the high-temperature measured object through a thread arranged on the outer side of the bolt (5), the signal processing assembly (20) is placed in a place with lower environment temperature, and an internal circuit acquires, calibrates and amplifies a resistance signal and finally converts the resistance signal into a current of 4mA-20mA to be output. The practical application problem of normal work of the temperature sensor under the conditions of high medium temperature and low environment temperature is solved.

The invention provides a negotiation method for realizing Ethernet cable state detection, which relates to the technical field of Ethernet communication, and comprises the following steps that: home terminal equipment simultaneously and sequentially sends a plurality of quick connection pulse sequences to opposite terminal equipment on four pairs of Ethernet cables of a twisted pair, when the four pairs of Ethernet cables are judged to be normal according to the monitored quick connection pulse sequences sent by the opposite-end equipment, enabling a muti-giga rate mode and establishing a link with the opposite-end equipment; and when at least two pairs of Ethernet cables are normal, starting the two pairs of cables to realize a 1G rate mode, and selecting the two pairs of normal Ethernet cables to establish a link with opposite-end equipment. The method has the advantages that when it is detected that four pairs of cables are not all normal but at least two pairs of normal cable pairs exist, the strategy of a 1G rate mode is achieved by opening the two pairs of cables, damaged cable pairs are avoided, the normal cable pairs are selected to establish a 1Gbps link, and the bandwidth provided by the normal cable pairs is used to the maximum extent.

The invention relates to the technical field of power transmission cables, and discloses an anti-interference earth resistivity measurement cable, which comprises a core wire layer, an inner shielding layer is sleeved outside the core wire layer, an integrated common-mode suppression layer is sleeved outside the inner shielding layer, an outer shielding layer is sleeved outside the integrated common-mode suppression layer, and an inner shielding layer is sleeved outside the outer shielding layer. The outer shielding layer is sleeved with an outer sheath. The core wire layer is composed of a plurality of pairs of differential twisted pairs. The inner shielding layer comprises a first longitudinal wrapping layer formed by an aluminum foil composite belt and a first metal braid layer arranged on the outer side of the first longitudinal wrapping layer. The integrated common-mode suppression layer is composed of a nanocrystalline magnetic ring array distributed in the axial direction of the cable, and nanocrystalline magnetic rings are fixedly arranged in the axial direction of the cable. The integrated common-mode suppression layer is composed of the nanocrystalline magnetic ring arrays distributed in the axial direction of the cable, a high-impedance path can be formed for common-mode interference signals generated by power frequency and harmonic waves of the power frequency, and therefore the signal-to-noise ratio and transmission stability of ground resistivity measurement signals are improved.

The utility model relates to an optical fiber tester for router inspection. The optical fiber tester comprises a shell and a main control board, a display screen, control keys and indicator lamps are arranged on the front face of the shell, a pair of optical fiber SC interfaces used for optical fiber testing is arranged on the top of the shell, a twisted-pair RJ45 interface is arranged on one side of the shell, a light source module is detachably inserted into the bottom of the shell, and an auxiliary control panel is arranged in the light source module. A first red light source transmitting module, a first optical signal receiving module, a second optical signal receiving module, an optical power module, a display and key driving module and a main control module are integrated on the main control board; a second red light source emitting module and an auxiliary MCU processor are integrated on the auxiliary control board. According to the optical fiber tester for router inspection, a twisted pair detection function is added while a traditional optical fiber detection function is achieved, and the functional structure is integrated and designed on the tester body, so that the optical fiber tester can comprehensively detect optical fibers on the upstream and downstream of a router communication path and input and output twisted pairs.

The underwater wiper camera provided by the application comprises an underwater camera, a transmission cable and a display device; the underwater camera is connected with the display device through the transmission cable; the cable is a twisted pair cable for signal transmission, and has good stability, strong anti-interference performance and high transmission speed in actual application; the cable sheath is made of imported polyurethane, has high corrosion resistance and can be used in a special seawater environment; a wiper assembly is used for cleaning the protective lens, can effectively and continuously keep the lens clean; the protective lens covers and seals the first end portion; the shooting direction of the camera is towards the protective lens; an LED lamp assembly surrounds the camera shooting end periphery, and is located in the shell; the camera is connected with the display device through the transmission cable. The underwater wiper camera provided by the embodiment of the application adopts mechanical rigid sealing, has compact structure and good sealing.

A serial asynchronous communications network to allow a number of electronic devices, controllers and / or monitors to be communicably connected to one another. Embodiments of the invention provide for an easily expandable network to be realized and allow for an efficient method for transmitting and receiving messages over the network. Embodiments of the invention may be deployed in a network having a communications bus which may be realised as a single wire, track or cable. Other embodiments are suitable for a communications bus realised as a pair of wires operating in differential mode. The pair of wires may have a twisted pair configuration according to some embodiments. Embodiments of the invention also include provision for bus arbitration, thus avoiding collisions on the bus when a plurality of actors attempt to communicate over the bus simultaneously.