How to standardize the network interface of the crystal head of the RJ45 interface connector?
What is an RJ45 interface connector? What is a crystal head connector?
The RJ45 type network cable plug is also known as a crystal head. It is made of eight cores and is widely used in the connection of network cables (called Category 5 cables or twisted pairs) between LANs and ADSL broadband Internet users' network equipment. In specific applications, RJ45 plugs and network cables have two connection methods (line sequence), called T568A line sequence and T568B line sequence, respectively. The identification method of the pin number of the RJ45 network cable plug is: holding the plug in hand, the end with 8 small gold-plated pieces is up, and the end with the rectangular large mouth into which the network cable is inserted is down, and at the same time, face the one without the elongated plastic bayonet Looking at your eyes, starting from the first small gold-plated piece on the left are feet 1, 2 ..., 8th.
The crystal head is a plastic connector that can be inserted in a fixed direction and automatically prevents it from falling off. It is commonly known as "crystal head", and the professional term is the RJ-45 connector (RJ-45 is a network interface specification, similar to RJ-11 The interface is the "telephone interface" that we usually use to connect the telephone line). It is called the "crystal head" because of its crystal clear appearance.
The crystal head is suitable for field termination of equipment rooms or horizontal subsystems, and the shell material is made of high-density polyethylene. The RJ-45 plug must be installed at both ends of the twisted pair so that it can be plugged into the RJ-45 interface of the network interface card (NIC), hub (Hub) or switch (Switch) for network communication. The two ends of each twisted pair are connected to the network card and hub (or switch) by installing a crystal head.
In network products, the network cable and the crystal head may not be too common. Although the network cable and the crystal head are not important things, if the quality of the network cable and the crystal head is not good, then when going online to transfer and exchange important data, you will often encounter various inexplicable problems, causing unnecessary trouble. Therefore, when buying network cables and crystal heads, try to choose some products with better quality, especially for some engineering projects that require compliance and testing, the requirements are even more stringent. Let's talk about the skills of buying network cable and crystal head, I hope to give you some tips. There are two types of network cables: one is coaxial cable (which has basically been eliminated), and the other is twisted-pair cable. We will only discuss the purchase of twisted-pair network cable here.
Super five types of network jumpers are the most commonly used network cables in network wiring, divided into shielded and unshielded. If it is used outdoors, the shielded wire is better. Generally, five types of unshielded are enough indoors. Since the shielding layer is not provided, the cable will be relatively soft, but the connection method is the same. Generally, Cat5e cables have four pairs of twisted pairs and are marked with different colors.
RJ45 twisted pair:
1. Good packaging, good products must have good packaging, but not necessarily good packaging is good products;
2. There is a logo. Category 5 twisted pair is an 8-core cable. The words "24AWG ... CAT5" should be printed on the wire body. 24AWG indicates that the copper core adopts the AWG standard, and the diameter of the core is 0.5 mm. Class line, as well as the line length mark and the name of the manufacturer;
3. Stranding density. If the stranding density does not meet the technical requirements, it will cause cable resistance mismatch, causing near-end crosstalk to shorten the transmission distance and reduce the transmission speed. Choose a twisted pair with a high stranding density at the time of purchase;
4. The twisted pair with good toughness and good quality should be full of feel. The outer skin is made of new PVC material, which can be bent arbitrarily, and the copper core is neither soft nor hard;
5. Flame-retardant, in addition to a certain tensile resistance, the twisted-pair sheath must also be flame-retardant. The test method burns the cable with a fire. In the fire, the sheath will have an ignition head, and then take it out if the flame retardant is good The cable will stop burning immediately.
If you want to know more, our website has product specifications for RJ45 interface connector, you can go to ALLICDATA ELECTRONICS LIMITED to get more information