The common RJ45 module is a kind of connector in the wiring system. The connector is composed of plug and socket. The connector composed of these two elements is connected between the wires to realize the electrical continuity of the wires. RJ45 module is the most important socket in the connector.
RJ is the abbreviation of registered jack, which means “registered socket”. The definition in FCC (standards and regulations of the United States Federal three states Communication Commission) is that RJ is the interface describing the public telecommunications network, commonly used RJ-11 and RJ-45, and RJ-45 of computer network is the common name of the standard 8-bit modular interface. In the past, RJ type interfaces were used in Category 4, category 5, super category 5 and category 6 cabling. In the class VII cabling system, the “non RJ” interface will be allowed. For example, on July 30, 2002, Tera class VII connector developed by Simon company was officially selected as the standard mode of “non RJ” class VII standard industrial interface. The transmission bandwidth of tera connector is up to 1.2Ghz, which exceeds the seven types of standard transmission bandwidth of 600MHz currently under development.
There are four basic RJ Module Sockets commonly used in the field of network communication, and each basic socket can connect RJ with different structures. For example, a 6-core socket can connect RJ11 (1 pair), RJ14 (2 pairs) or rj25c (3 pairs); An 8-core socket can connect rj61c (4 pairs) and rj48c. 8-core (keyed) can connect rj45s, rj46s and rj47s.
RJ45 module is a kind of connector in wiring system. The connector is composed of plug and socket. The connector composed of these two elements is connected between the wires to realize the electrical continuity of the wires. RJ45 module is the most important socket in the connector.
RJ is the abbreviation of registered jack, which means “registered socket”. The definition in FCC (Federal Communications Commission standards and regulations) is that RJ is the interface describing public telecommunication network, commonly used RJ-11 and RJ-45, and RJ-45 of computer network is the common name of standard 8-bit modular interface. In the past four categories, five categories and super five categories, including the newly introduced six categories of cabling, RJ type interfaces are adopted. In the class VII cabling system, the “non RJ” interface will be allowed. For example, on July 30, 2002, Tera class VII connector developed by Simon company was officially selected as the standard mode of “non RJ” class VII standard industrial interface. The transmission bandwidth of tera connector is up to 1.2Ghz, which exceeds the seven types of standard transmission bandwidth of 600MHz currently under development.
There are four basic RJ Module Sockets commonly used in the field of network communication, and each basic socket can connect RJ with different structures. For example, a 6-core socket can connect RJ11 (1 pair), RJ14 (2 pairs) or rj25c (3 pairs); An 8-core socket can connect rj61c (4 pairs) and rj48c. 8-core (keyed) can connect rj45s, rj46s and rj47s. RJ45 socket and RJ45 connector (crystal head) are the basic connectors in generic cabling system. We will introduce RJ45 connector (crystal head) in detail later.
The core of RJ45 module is modular jack. The gold-plated wire or socket hole can maintain a stable and reliable electrical connection with the modular plug shrapnel. Due to the friction between the shrapnel and the insertion hole, the electrical contact is further strengthened with the insertion of the plug. The jack body design adopts the overall locking mechanism, so that when the modular plug (such as RJ45 plug) is inserted, the interface between the plug and the jack can produce the maximum drawing strength. The wiring block on the RJ45 module is connected to the twisted pair through the trunking, and the locking spring can fix the RJ45 module on the panel and other information outlet devices. Figure 2-20 is the front view, side view and stereoscopic view of RJ45 module respectively.
The common unshielded module is 2cm high, 2cm wide and 3cm thick. The plastic body is resistant to high voltage, flame retardant and UL rated hot melt 94V-0. It can be clamped into any M-series modular panel, bracket or surface mounting box, and can be installed at a 90 degree (vertical) or 45 degree angle on the standard panel. The special process design provides at least 750 repeated plugging. The module uses the general label of t568a and t568b wiring, and it also has a white flat wire insertion cover. This type of module usually requires a wiring tool – a 914 tool with a 110 blade to connect the cable. This unshielded module is also the most widely used module in the generic cabling system in China. Its shape remains quite consistent from category III, category V, super category V and category VI.
In order to facilitate the user’s plug-in and installation operation, the user also began to like to use the 45 degree angle operation. In order to achieve this goal, the current standard module can be completed with a 45 degree angle panel, or the module installation end can be directly designed into a 45 degree angle (Fig. 2-21).
The design of the thread free tool is also an embodiment of the humanized design of the module. No special tools are required for the termination of this module, such as Siemon mx-c5 module with the thread free tool design (left of Fig. 2-22) and Nexans lanmark-6 snap in module (right of Fig. 2-22).
ACO communication socket system (Figure 2-23) is a communication socket system launched by amp. It adopts a unique design. It is also terminated in a space similar to the size of RJ45 standard module. This socket system is composed of different communication interfaces and plug-ins. It supports not only voice and data application modules, but also coaxial interface, audio and video interface. The module is integrated with the panel, which is composed of surface mounting interface, connecting joint, mounting base and bottom cover (Fig. 2-24).
Figure 2-27 details the termination process of SYSTIMAX SCS 61 series cables on mps100e module.
Modules in generic cabling are used to terminate cables and effectively connect with jumpers. In the products of some manufacturers, modules and distribution frames are configured more scientifically. These distribution frames are actually composed of an empty board and modules that can be assembled with various modules. Users can install corresponding modules according to the type and quantity of modules actually applied. In this case, modules also become an integral part of the distribution frame (omitted in Figure 2-27). From here, we can also summarize the application occasions of modules: terminating to different panels, installing to surface mounting boxes and other components, and installing into modular distribution frames (Fig. 2-28 is omitted).
It should be noted that since there are crosses or isolation strips in the center of category 6 cables, they should be cut off before termination.
The module is also divided into unshielded module and shielded module. Fig. 2-29 is the physical diagram of a typical shielding module, and Fig. 2-30 is its structure diagram.
Fig. 2-29 structure diagram of shielding module Fig. 2-30 structure diagram of shielding module
RJ45 modules from different manufacturers have their own unique design. The most representative is the built-in dust cover module of datagate. The built-in dust cover series socket has a spring-loaded built-in dust cover, which can retract and pop out automatically when inserting and pulling out the jumper plug. In addition, its unique spring supported “door” ensures that the jumper plug will never be inserted only partially, affecting the stable data transmission. The traditional socket with dust cover usually requires two hands to open the dust cover and insert the jumper, while the socket with dust cover built in Molex enterprise wiring network department allows one hand to insert the jumper, making it easier to use. In addition, when connecting / disconnecting each time, the “door” will wipe the pins, which can comprehensively prevent dust and impurities from entering the connector, so as to maximize the protection of the socket and ensure the reliable credit transmission capacity. Molex socket with built-in dust cover has a compact appearance (21mm high) × Width 21mm × 26mm thick), achieving maximum density on each workstation. In a rectangular wall panel of standard size, it can accommodate up to 6 sockets; Up to 4 sockets can be accommodated in a standard size square wall panel with dust cover. Twice the density of a traditional socket.
A shielding module for industrial environment application adopts different shielding methods, and the outer ring is surrounded and fastened with spiral mosquito structure (omitted in Fig. 2-31).
When the module is connected with the modular plug (RJ45 head), crosstalk is an important factor considered in the design. In order to make the whole link have better transmission performance, crosstalk cancellation technology is often used in the socket. Crosstalk cancellation technology (omitted in Fig. 2-32) works in this way, which can generate crosstalk signals with the same magnitude and opposite polarity as the interference introduced from the plug to offset crosstalk.