110 results about "Registered jack" patented technology

The utility model relates to the technical field of network cables, and discloses a network cable switching box. The connecting line is arranged on the rear side of the switching box body, a wiring hole is formed in the front side of the switching box body, and a crystal head is arranged in an inner cavity of the wiring hole; the connecting plates are arranged on the two sides of the crystal head, first toothed plates are fixedly connected to the rear sides of the connecting plates, positioning shells are fixedly connected to the two sides of the switching box body, and mounting assemblies are arranged in inner cavities of the positioning shells. When a user needs to install and clamp the crystal head, the first toothed plate is inserted into the inner cavity of the positioning shell, the inclined plane of the first toothed plate is in contact with the inclined plane of the second toothed plate so as to abut against the second toothed plate, and the second toothed plate is stressed to extrude and retract the second spring until the first toothed plate is completely inserted into the rear side of the inner cavity of the positioning shell; the second toothed plate is driven by the second spring to reset, so that the first toothed plate is positioned, and the crystal head is prevented from falling off due to external dragging and affecting the data transmission efficiency.

The invention relates to the technical field of network cable sealing, in particular to a network cable sealing method, which comprises the following steps: S1, pre-sleeving a first heat shrink tube on a network cable; s2, stripping the outer sheath to expose the shielding layer and the core wire harness; s3, stripping the insulating layer of each core wire, wherein the conductor exposed section of each core wire is distributed in a step shape; s4, sleeving a second heat shrink tube on the core wire harness, and injecting a sealant; s5, performing thermal shrinkage on the second thermal shrinkage tube, and arranging the folded shielding layer to enable the shielding layer to wrap the periphery of the first sealing layer; s6, crimping the core wire harness and the crystal head; s7, the first heat shrink tube is pushed to the wrapped shielding layer area, and sealant is injected; and S8, performing thermal shrinkage on the first thermal shrinkage tube to enable the core wire harness in the network cable and the shielding layer to have no relative displacement. The cable has the advantages that the conductor exposed sections of the core wires are distributed in a stepped staggered mode in the axial direction, it is guaranteed that the core wires can make full contact with sealant to achieve the insulation effect when the sealant is injected subsequently, and it is also guaranteed that the core wires make contact with one another, and short circuit is avoided.

The application discloses a signal connector capable of shielding ground, which comprises a socket shell, a plug shell matched with the socket shell, two crystal heads and a first shielding shell. One end of the socket shell is provided with two first through holes penetrating to the other end of the socket shell, and the two crystal heads are respectively arranged in the first through holes. One end of each crystal head is connected with a cable, and one end of the cable is arranged to pass through the plug shell. The two crystal heads are integrated, which can be applied to the connection equipment with double network ports, is convenient to use and saves the installation cost. Meanwhile, the first shielding shell and the second shielding shell are arranged to shield the ground signal, avoid the connection signal interference and ensure the signal transmission quality. In addition, the first sealing ring and the second sealing ring are arranged to improve the waterproof and dustproof performance, and the elastic pressing sheet is arranged on the second shielding shell, which can facilitate the dismounting and replacement of the crystal head and is convenient and practical.

1. The name of the design product: network cable crystal head protection cover. 2. The use of the design product: for protecting network cable crystal head. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The application discloses a high-end communication connecting line and belongs to the technical field of communication connecting lines. The high-end communication connecting line comprises an integrated data line bundle and a crystal head. Data single wires are formed at both ends of the integrated data line bundle through peeling. A plurality of line slot positions are arranged on the crystal head, and the integrated data line bundle and the crystal head are connected through a connecting structure arranged in the middle and form a solidification structure. The connecting structure comprises a first sheath and a second sheath. One end of the first sheath is a threading solid seat body, three full-circle through holes and two half-circle through holes are formed in the threading solid seat body, and an end baffle is fixedly arranged at the other end of the first sheath. A middle baffle is fixedly arranged in the middle of the second sheath. The high-end communication connecting line can reduce signal crosstalk, attenuation and the risk of open circuit caused by stress concentration, guarantee the integrity and stability of high-speed data or high-frequency signal transmission, has excellent dustproof and moisture-proof performance, and significantly prolongs the service life of the connecting line in harsh environments.

The utility model provides a data network distribution frame which comprises a mounting plate, a mounting frame is fixedly mounted at the bottom of one side of the mounting plate, mounting holes are formed in the mounting plate in a horizontal linear array at equal intervals, and crystal head female seats are arranged on the mounting plate and located in the mounting holes; and a plurality of positioning mechanisms for positioning the network cable are mounted on the mounting rack. According to the utility model, through the design of the annular positioning plate and the clamping piece, when data network power distribution installation is carried out, network cables to be subjected to power distribution installation respectively pass through the gaps on the annular positioning plate, so that the network cables are located in the annular positioning plate, and after the network cables are connected with the crystal head female seat, the annular positioning plate is abutted against the network cables; and then the clamping piece is clamped with the annular positioning plate, so that the network cable and the mounting frame can be positioned, a mode of positioning the network cable and the distribution frame by using a ribbon is replaced, the use is convenient, and the annular positioning plate is matched with the clamping piece, so that the network cable mounting frame can be repeatedly used.

The utility model discloses network cable crimping pliers for network maintenance and repair. The network cable crimping pliers comprise a cable crimping mechanism and a cable stripping mechanism. The cable pressing mechanism comprises a block body, a network cable connector slot and an empty slot are formed in the block body, two movable blocks are rotationally connected to the block body, one side of each movable block is fixedly connected with a connecting arm, a sliding groove is formed in each connecting arm, and a protruding block is slidably connected to the inner side wall of each sliding groove. According to the network cable crimping pliers for network maintenance and repair, through the arrangement of the cable crimping mechanism and the cable stripping mechanism, the bracket can be driven to move through the connecting arm after the handle is tightened, so that the bracket drives the cable crimping plate to compress a crystal head, and a network cable can be stably connected with the crystal head; after the connection sheets are spliced, the network cable can be stripped through the wire stripping grooves; through the above arrangement, integration of wire stripping and wire pressing is realized, so that the working efficiency during network cable connection is improved.

The utility model discloses a crystal head wiring protective sleeve, which relates to the technical field of signal connecting devices, and comprises a network cable sheath part and a crystal head connecting part, and the crystal head connecting part is provided with a fixed wall plate used for being connected with a crystal head and a first elastic sheet used for protecting a crystal head elastic sheet. The front end, inserted into the crystal head, of the fixing wall plate is a thin arm, the rear end of the fixing wall plate is a thick wall, the rear end of the fixing wall plate is provided with a clamping protrusion and a clamping groove, the clamping protrusion and the clamping groove are completely matched with the internal structure of the crystal head, the network cable sheath part is provided with a necking clamping ring, and the outside of the necking clamping ring is in threaded connection with a clamping ring. According to the utility model, the fixed wall plate is extended, a network cable is convenient to plug and unplug, the front end, inserted into the crystal head, of the fixed wall plate is a thin arm, the rear end is a thick wall, the front end is thin, the rear end is thick, the fixed wall plate can be conveniently inserted into the crystal head, and the fixed wall plate is provided with the clamping bulge and the clamping groove, so that the crystal head connecting part and the crystal head are conveniently connected and fixed.

The utility model discloses an anti-vibration high-speed cable assembly, and relates to the technical field of cable assemblies, the anti-vibration high-speed cable assembly comprises a cable used for transmitting high-speed signals, the tail end of the cable is provided with a crystal head, and a connecting assembly is arranged between the crystal head and the cable. According to the device, the threaded cylinder is screwed, the threaded cylinder drives the extrusion ring to get close to the mounting plate, then the mounting plate extrudes the locking piece, and the locking piece extrudes the cable, so that the cable and the crystal head are fixedly connected together, and the situation that the cable is separated from the crystal head during vibration is avoided.

The utility model discloses a network cable crystal head which comprises a body, a power connection sheet and a pressure applying piece. The upper end of the body is provided with hinge seats which are symmetrically arranged, and the lower end of the body is provided with a plurality of wiring grooves and mounting grooves communicated with the wiring grooves. A blocking body is arranged on the pressing piece, and an elastic piece matched with the pressing piece is arranged on the body. According to the network cable crystal head, through the detachable pressure applying piece, the crystal head can be limited during installation, the pressure applying piece can be taken down without auxiliary descending of a wiring clamp, and wiring operation of the crystal head is achieved. The problem that wiring can be well completed only by using tools can be well solved, the wiring difficulty is reduced, and the wiring efficiency is improved.

The utility model provides a special plastic forming mould for a network cable crystal head, which comprises a mould body, the mould body is formed by combining an upper mould strip and a lower mould strip, the left end and the right end of the upper mould strip are respectively provided with an upper threaded hole, the left end and the right end of the lower mould strip are respectively provided with a lower threaded hole, and bolts are arranged in the lower threaded holes. A movable gap is formed between the upper die strip and the lower die strip, the left side and the right side of the upper die strip and the left side and the right side of the lower die strip are respectively provided with a spring groove, each spring groove is provided with a spring, the die body is provided with a plurality of die strip insertion holes, and the die strip insertion holes comprise upper half insertion holes formed in the upper die strip and lower half insertion holes formed in the lower die strip. And a raised metal tooth sheet is arranged in the upper half jack. According to the utility model, the two die strips with teeth are designed, the two die strips are elastically fixed, and the die strips are completely closed to limit the height when the die is closed, so that a molding inner die sizing material is prevented from being injected into a crystal head to cause the punching height of a gold sheet.

The utility model provides a network jumper wire with a color ring identification function. The network jumper wire comprises a wire rod and two crystal heads. The two ends of the wire rod are electrically connected with one crystal head respectively, the rear end of each crystal head is connected with a wire protecting sleeve, and the wire rod is wrapped with the wire protecting sleeves; a C-shaped clamping groove is formed in the outer wall of the rear end of each wire protecting sleeve, and a C-shaped color ring is clamped to the clamping groove in a matched mode. The colors of the two color rings in the same network jumper wire are the same; inverted buckles are integrally formed at the two ends of the color ring, buckling grooves are formed in the two ends of the clamping groove, and each inverted buckle is buckled in the buckling groove in the corresponding position; when the network jumper wire is used, operation and maintenance personnel can quickly find out crystal heads at the two ends of the same network jumper wire according to the color difference of the color rings, so that convenience can be brought to maintenance of the operation and maintenance personnel.

The utility model discloses a network cable joint with stretch unlocking structure, including main network cable, main network cable inserts into fixed connection, the utility model discloses after being connected with main network cable and crystal head integrally in the both ends of link piece, the plug -in groove department of link piece both sides inserts into the plug -in post department of the inside of the connecting portion of the both sides of pressure plate spare, be equipped with the pressure head department on the one side of pressure plate spare, be equipped with recess portion in the pressure head department, and recess portion inserts into one end fixed connection of pull rope, and the pull rope middle part is passed through in the positioning block top of link piece, and the pull rope middle part is passed through again from the recess portion below pressure plate spare, after passing through, the other end of pull rope connects pull head spare, and the pull -up department on the crystal head is on the recess portion, after using pressure plate spare on the whole network cable joint, the situation that the person presses the crystal head with the finger is saved, prevents the slip, and saves time and labour, avoids the situation of pulling apart simultaneously.

The utility model relates to the technical field of interface connecting devices, and discloses a central dispatching ASON network gateway interface connecting device, which comprises a network management body, and fixing plates are fixedly mounted at the front ends of the left side and the right side of the network management body. By arranging the screw rod, the moving block, the half-tooth gears and the rotating plate, as the screw rod is in threaded sleeve connection with the moving block, when the screw rod rotates, the moving block is driven to move backwards along the outer surface of the limiting block; at the moment, the moving block drives the two long rods to rotate in the opposite direction through the two half-tooth gears, then the two long rods drive the two rotating plates to rotate in the opposite direction, due to the design of the check blocks, the rotating plates can only rotate by 90 degrees, and when the two rotating plates rotate by 90 degrees, the two rotating plates are blocked by the check blocks; at the moment, the interiors of the two rotating plates are attached to the surface of the data line of the crystal head and fix the data line, and therefore the crystal head can be prevented from shaking under the influence of external force.

The utility model relates to the technical field of network equipment, in particular to a network cable controller and a control mechanism, which comprise a control part, an execution part and a communication part, and the communication part controls the operation of the control part through the execution part; the driving mechanism comprises a USB connecting line and a USB connector which are connected with the control part, and the USB connector controls the communication part to operate through the USB connecting line; according to the network cable controller, power is supplied to a relay power supply through the USB connector, so that a relay coil is electrified, a relay contact is closed, and whether an external network cable is communicated with a fourth contact piece or not can be controlled by plugging and unplugging the USB connector; the PC end is started up, the USB connector is powered on, so that the whole network physical link is connected, the network is sent after starting up, the on-off of the network can be controlled when the network cable is connected, the network disconnection can be realized without manually pulling out a crystal head, and the service life of the network cable is prolonged.

The invention discloses a self-locking crimping mechanism network connector, and relates to the field of network equipment, the self-locking crimping mechanism network connector comprises a shell and a plurality of rotary cutting assemblies, the shell is internally provided with a cavity, the shell is fixedly provided with a mounting rod in the middle of the cavity, and each rotary cutting assembly comprises a lantern ring; the lifting lever is fixedly connected to the upper half part of the lantern ring, the pricking and pressing tool bit is fixedly connected to the lower half part of the lantern ring, the lantern ring is rotationally connected to the mounting rod, the lifting lever and the pricking and pressing tool bit can rotate with the lantern ring as the circle center, and the pricking and pressing tool bit has electrical conductivity; according to the invention, the rotary cutting assembly is arranged in the crystal head and is used for puncturing the network cable rubber, so that the copper core in the network cable can be electrically connected with the conductive copper seat of the crystal head through the conductive puncturing and pressing tool bit, and the installation operation of the network cable crystal head is completed; in the prior art, the conductive copper sheet is pressed by a network cable clamp tool, so that the conductive copper sheet is stabbed into the network cable rubber sheet and is contacted with the copper core to establish connection, and the convenience of the installation and connection operation is improved.

The invention relates to the technical field of cable protection, and discloses a switch with a wire harness protection structure, and the switch comprises a clamping mechanism which is fixedly disposed on the switch; the pressure applying part is connected with the clamping mechanism, and the pressure applying part can apply pressure to the clamping mechanism, so that the clamping mechanism can be fixed on the outer side of the cable; by effectively reducing the possible bending angle of the cable at the joint, the service life of the cable can be prolonged, and the connection stability can be remarkably improved. In addition, the clamping mechanism can effectively resist potential pulling force of the external environment on the cable, cable loosening or damage caused by external force is prevented, and the reliability of data transmission is further ensured. By adding protection measures at key parts, the phenomena of excessive bending and pulling between the wire harness and the crystal head are effectively reduced, so that the anti-interference capability and durability of the wire harness are remarkably improved, and the stability of data transmission and the reliability of a network are ensured.

The utility model discloses a dual-channel transmission monitoring system, which comprises a server, a second switch, a third switch, a personal computer (PC) and an electric power monitoring substation, and a first switch, a first communication management machine and a second communication management machine are arranged in the electric power monitoring substation. Each of the first communication management machine and the second communication management machine comprises at least three LAN (Local Area Network) ports, a crystal head fixing mechanism is arranged at each LAN port, the first communication management machine and the second communication management machine are in communication connection with the first switch through the LAN ports, the first switch is in communication connection with the server through the second switch, and the server is in communication connection with the server through the second switch. The server is connected with the PC through the third switch, and hardware support is provided for data transmission and monitoring. Meanwhile, crystal head fixing mechanisms are arranged at the LANs of the first communication management machine and the second communication management machine, so that the problem that crystal heads are damaged due to the fact that an operator mistakenly touches a network cable is solved, and the situation of signal interruption is avoided.

The invention discloses an informatization network wiring arrangement device which mainly comprises a switch body, a mounting seat is mounted on one side of the switch body, and a plurality of network ports are formed in the side face, close to the mounting seat, of the switch body. Compared with the prior art, the crystal head fixing device has the advantages that when the crystal head fixing device is used, a crystal head is placed in the mounting groove and clamped with a network port, then the top end of the side cover serves as a supporting point, the top end of the triangular block is lifted upwards, the bottom ends of the two clamping pieces are driven to rotate mutually, the base and the side cover are synchronously transferred into the mounting groove, and the triangular block is released after the base and the side cover are pressed in place downwards; the clamping piece is clamped with the buckle, so that the U-shaped groove is clamped outside the network cable, meanwhile, the base abuts against the end of the crystal head, one end of the supporting plate abuts against the side wall of the mounting groove, then the end of the crystal head is limited and blocked, crystal head loosening caused by external traction is avoided, the overall structure is simple, mounting is convenient, and practicability is high. And the problems in the prior art are effectively solved.

The utility model discloses a clamping structure for a cable connector, which comprises a clamping structure I and a clamping structure II, the clamping structure I comprises at least one group of first clamping grooves and first clamping bulges, and the clamping structure II comprises at least one group of second clamping grooves and second clamping bulges. The first clamping groove of the first clamping structure and the second clamping protrusion of the second clamping structure can be clamped with each other, and the first clamping protrusion of the first clamping structure and the second clamping groove of the second clamping structure can be clamped with each other. According to the network module connector, when an upper cover and a lower shell are buckled, a limiting space for arranging a link functional core and a wire card is formed between a connector shell and a connecting part. The crystal head connector further comprises an insertion part which can be inserted into the insertion opening, an outer shell body of the insertion part and the lower shell are integrally formed, and a separation mechanism is arranged on the upper surface of the insertion part. According to the utility model, loosening of the upper cover and the lower shell in the use process can be effectively avoided, and stable connection of the cable and the connector is improved.

The application belongs to the technical field of network communication equipment, and particularly relates to a router convenient to install and a wire-off-preventing method thereof, which comprises a shell, the bottom surface of the shell is provided with installation grooves arranged in an array, an auxiliary mechanism is arranged at the lower end of the shell, a limiting mechanism is arranged at the back of the shell and used for limiting a cable crystal head, a heat dissipation mechanism is arranged at the upper end of the shell and used for heat dissipation, and a storage groove is arranged on the shell and used for storing cooling liquid, wherein the auxiliary mechanism comprises a cable bundling part arranged in the installation groove and used for accommodating the cable, a cooling part is arranged on the cable bundling part and used for cooling the cable, and a driving part is further arranged on the back of the shell and used for driving the cooling part to work. The application can effectively improve the cable management convenience and heat dissipation efficiency, and enhance the connection stability and environmental adaptability.

1. The name of the design product: crystal head (screw buckle). 2. The use of the design product: crystal head for connecting communication and network. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

The present invention relates to the technical field of conductive connection, and discloses a network branch structure for power grid dispatching monitoring transmission, including: a splitter body; an insertion interface opened on the front surface of the splitter body; a base fixed to the lower end inside the splitter body, and a bracket fixed on the base; a wiring network interface slidably arranged inside the base and corresponding to the insertion interface; an adjustment component arranged inside the bracket to drive the wiring network interface to move; by setting a bracket, an adjustment component, a first clamping plate, a second clamping plate and a linkage component, after the crystal head is connected to the splitter body, the present device can well clamp and fix the branched network cable connected to the crystal head, ensure the stability of the connection between the crystal head and the splitter body, and further ensure the stable transmission of power grid dispatching monitoring. Moreover, after clamping, it can shield the insertion interface, has good dust and water protection, and improves the protection effect of the device.

1. The name of the design product: anti-vibration industrial shielding crystal head. 2. The use of the design product: network crystal head for connecting network equipment interface. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: combination state diagram.

The utility model discloses a network cable unlocking and locking device, which comprises a lock shell, a sliding block assembly, a lock hole for inserting an unlocking key and a network cable matching hole for inserting a network cable, and is characterized in that the sliding block assembly comprises a locking part which can be propped against or separated from an elastic arm of a network cable crystal head; the network cable matching hole is internally provided with a cavity and a protruding part arranged towards the bottom of the network cable crystal head, the protruding part is arranged in the cavity, the locking part comprises an unlocking position and a locking position, and at the locking position, the locking part abuts against an elastic arm of the network cable crystal head, and a boss of the network cable crystal head is buckled with the protruding part, so that the network cable is limited in the network cable matching hole; and at the unlocking position, the locking part is separated from the elastic arm of the network cable, and the accommodating height of the cavity is increased, so that the network cable can move in the network cable matching hole. According to the technical scheme, the network cable unlocking and locking device is small and simple in structure, locking management can be carried out on the network cable in use, and the unlocking and locking state of the network cable unlocking and locking device is visualized.

The utility model relates to the technical field of network cable protection, and discloses a network cable protection structure which comprises a protection cylinder and a threaded cylinder and further comprises a hollow ring fixedly connected to the surface of the threaded cylinder, extension rods are fixedly connected to the two sides of the surface of the hollow ring, a through groove is formed in the surface of the protection cylinder, and the extension rods are fixedly connected to the two sides of the surface of the hollow ring. The surface of the extension rod is in contact with the inner wall of the through groove, a positioning groove is formed in the top of the extension rod, and positioning mechanisms are arranged on the two sides of the surface of the protection barrel. The network cable protection structure can accommodate network cables with different diameters and is suitable for network cables provided with crystal heads, in addition, when the structure is idle, the auxiliary mechanism is arranged in the groove and can be protected, and the problems that when an existing partial protection structure is used, a worker cannot penetrate through the structure conveniently, and the network cable protection effect is poor are solved. A network cable with a crystal head is more difficult to pass through the structure, and most of the screw rods are independently arranged outside and are easy to damage and influence normal use.

The utility model discloses a waterproof connector network cable capable of being supported and processed on the ground, which relates to the technical field of network cables and comprises a wire connector, wiring holes are arranged in the middles of two ends of the wire connector, the interiors of the wiring holes are connected with crystal heads in a clamping manner, waterproof structures are arranged on the outer sides of the crystal heads, and each waterproof structure comprises a waterproof sleeve located on the outer side of the corresponding crystal head. The two ends of the wire connector are provided with sealing grooves, the sealing grooves are located on the outer side of the wiring hole, and the end, close to the wire connector, of the waterproof sleeve is fixedly connected with a sealing ring. The waterproof connector network cable capable of being supported and processed on the ground is provided with a waterproof structure, when a crystal head is installed in a wiring hole, a waterproof sleeve is moved towards a direction close to a wire connector, so that the waterproof sleeve and the end part of the wire connector are attached to each other, and meanwhile, a sealing ring is clamped and connected in a sealing groove to form a sealing structure; therefore, the connection part of the wiring hole and the crystal head is sealed, and the connection part of the wire connector and the crystal head is prevented from being damaged by water.

The utility model relates to a quick connection crystal head in the technical field of network cable connectors, the rear end of a limiting plate is fixedly provided with a spring used for resetting the limiting plate, and the right end of the limiting plate is fixedly provided with a connecting rod used for driving the limiting plate to move back and forth. An operation plate used for driving the connecting rod to move front and back is fixedly installed at the right end of the connecting rod, and a locking rod used for locking the operation plate is arranged on a plate body of the operation plate. The two buckles below the bottom end of the cover plate are placed in the two first placement grooves, the springs are compressed by the fixing rods, when the two buckles below the bottom end of the cover plate are completely placed in the two first placement grooves, the buckles can be locked by the fixing rods under the elastic action of the compressed springs, and then the operation plate is locked through the locking rods. The cover plate is prevented from being opened by shaking; therefore, the network cable can be quickly connected with the network cable connector, and the crystal connector body is pressed and fixed through the cover plate.

The utility model relates to a computer communication network branching device, comprising a housing, a main crystal head jack and a first branch crystal head jack, the two ends of the housing are respectively provided with the main crystal head jack and the first branch crystal head jack, and the main crystal head jack and the first branch crystal head jack are internally provided with first contact pins. A first network cable is installed in the shell, the two ends of the first network cable are connected with first contact pins in the main crystal head jack and the first branch crystal head jack respectively, a plurality of branch connection seats are detachably installed on the top side of the shell, and second branch crystal head jacks are formed in the branch connection seats; the main crystal head jack and the first branch crystal head jack are arranged on the shell, one-to-one branching can be conveniently realized, meanwhile, the branching seats are detachably arranged on the shell, the disassembly and assembly are flexible, the branching seats with the corresponding number can be conveniently arranged on the shell according to the number of network cables required to be tapped actually, one-to-many branching can be realized, and the occupied space is small.

A standard for near end crosstalk of a category 6A cable, including a registered jack 45 (RJ45), a clamp connected to the RJ45, a first attenuator and a second attenuator. The RJ45 includes a first signal twisted pair to transmit a first source signal and a second source signal, and a second signal twisted pair to transmit a third source signal and a fourth source signal. The clamp includes a first signal pair connector electrically connected to the first signal twisted pair, a second signal pair connector electrically connected to the second signal twisted pair, a first differential amplification circuit and a second differential amplification circuit. The first attenuator is electrically connected to the first signal pair connector. The second attenuator is electrically connected to the second signal pair connector. The second attenuator and the first attenuator are configured to detect the near end crosstalk.