Knitted Wire Mesh,Mist Eliminator,Sealing And Filtering,Shielding Gasket Anping Guangtong Hardware Wire Mesh Co.,Ltd , https://www.apguangtong.com
Full color LED display cable and twisted pair splicing
The LED display screen is made up of individual boxes or spliced ​​by a block of LED modules. In the process of splicing, it is inevitable to use network cables and various twisted pairs, then for LED display engineers. How do you splicing these cables and twisted pairs? The following LED display manufacturer Shenzhen Lianshuo Optoelectronics will introduce you in detail:
Various network cable connector wire sequence
A wiring method is applied in the entire network cabling, but the network connection with the RJ45 end at both ends is common in the network, whether it is the termination mode A or the termination mode B. In practice, most of them use the T568B standard, which is generally considered to be better shielded against electromagnetic interference.
568B standard network cable
In addition, computer communication only uses 1.2.3.6 (white orange, orange, white green, green), four lines of ten hundred megabytes network card, Gigabit network card must have 8 lines, so you can use the other 4 Lines to save on wiring costs.
1. Positive line (ie straight line): Select standard 568B line sequence at both ends
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
2. Network measuring instrument jump light: 1 2 3 6 → 1 2 3 6
Reverse line (ie cross line): select the line order of 568B at one end and the line order of 568A at the other end
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
The order from left to right is (568A): white green, green, white orange, blue, white blue, orange, white brown, brown
3, network measuring instrument jump lights: 1 2 3 6 → 3 6 1 2
Positive line (ie straight line): Select standard 568B line sequence at both ends
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
4. Network measuring instrument jump lamp: 1 2 3 4 5 6 7 8 → 1 2 3 4 5 6 7 8
Reverse line (ie cross line): select the line order of 568B at one end and the line order of 568A at the other end
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
The order from left to right is (568A): white green, green, white orange, blue, white blue, orange, white brown, brown
5, network measuring instrument jump light: 1 2 3 4 5 6 7 8 → 3 6 1 4 5 2 7 8
Positive line (ie straight line): Select standard 568B line sequence at both ends
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
6, network measuring instrument jump light: 1 2 3 4 5 6 7 8 → 1 2 3 4 5 6 7 8
Reverse line (ie cross line): select the line order of 568B at one end and the line order of 568A at the other end
The order from left to right is (568B): white orange, orange, white green, blue, white blue, green, white brown, brown
The order from left to right is (568A): white green, green, white orange, white brown, brown, orange, blue, white blue
7. Network measuring instrument jump light: 1 2 3 4 5 6 7 8 → 3 6 1 7 8 2 4 5
The correct choice of straight and cross lines:
8, the meaning of each English letter
Among them, PC stands for computer, HUB stands for hub, SWITCH stands for switch, and ROUTER stands for router.
PC-PC: fork line
PC-HUB: Straight line
HUB-HUB common mouth: fork line
HUB-HUB (normal - cascade): straight line
HUB-HUB (continuous-cascade): cross line
HUB-SWITCH: Cross line
HUB (Cascade Port) - SWITCH: Straight Line
SWITCH-SWITCH: Cross line
SWITCH-ROUTER: Straight line
ROUTER-ROUTER: Cross line
9. Problems involved in the application of twisted pair in Gigabit network
(1) Gigabit backbone switches, connected to Gigabit switches, what line? Category 6 line (CAT6).
(2) Gigabit backbone switches, connected to hundreds of megabit switches, what line? Category 6 line (CAT6).
(3) Gigabit backbone switch, connect to new server, what line? Category 6 line (CAT6).
(4) Gigabit backbone switch, connect the old server, what line? Super five (CAT5E)., running 100Mbps.
(5) Gigabit switches, new machines, what line? For the budget, use Category 6 (CAT6), and at least use Category 5 (CAT5E).
(6) 100 Mbps switch, pick up the old machine, what line? Use super five. Originally, you can not move, if the quality is too bad, cut it off, and the new cloth is over five categories (CAT5E).
10, common twisted pair
Twisted pair common types are Category 3, Category 5 and Category 5, and the new Category 6 line. The former has a thin wire diameter and the latter has a thick wire diameter. The models are as follows:
1) Category 1 line: mainly used for transmitting voice (a type of standard is mainly used for cables before the early 1980s), which is different from data transmission.
2) Class 2 line: Transmission frequency is 1 MHZ, used for voice transmission and high transmission rate 4 Mbps data transmission, common in old tokens using the 4 MBPS specification token transfer protocol?
3) Category 3: Refers to the cable currently specified in the ANSI and EIA/TIA568 standards. The cable has a transmission frequency of 16 MHz and is used for voice transmission and data transmission with a high transmission rate of 10 Mbps is mainly used for 10BASE--T.
4) Category 4 cable: This type of cable has a transmission frequency of 20 MHz. The data transmission for voice transmission and high transmission rate of 16 Mbps is mainly used for token-based LAN and 10BASE-T/100BASE-T.
5) Category 5 cable: This type of cable increases the winding density, and is jacketed with a high quality insulating material with a transmission rate of 100 MHz. It is used for voice transmission and high transmission rate of 10 Mbps. It is mainly used for 100BASE-T and 10BASE-T network. This is a common Ethernet cable.
6) Super Category 5: Category 5 has low attenuation, low crosstalk, and higher attenuation and crosstalk ratio (ACR) and signal loss ratio (Structural Return Loss), smaller delay error, and very good performance. Great improvement. The Super Category 5 cable is mainly used for Gigabit Ethernet (1000 Mbps).
7) Category 6 cable: The transmission frequency of this type of cable is 1MHz ~ 250MHz. The Category 6 wiring system should have a large margin in the integrated attenuation crosstalk ratio (PS-ACR) at 200MHz. It provides 2 times the Category 5 super Category. bandwidth. The transmission performance of Category 6 cabling is much higher than the Category 5 standard and is best suited for applications with transmission rates above 1Gbps.
An important difference between Category 6 and Category 5 is that it improves performance in terms of crosstalk and return loss. For a new generation of full-duplex high-speed network applications, excellent return loss performance is extremely important. The basic link model is eliminated in the six categories of standards. The cabling standard adopts a star topology. The required cabling distance is: the length of the permanent link cannot exceed 90 m, and the channel length cannot exceed 100 m.
Currently, twisted pairs can be divided into unshielded twisted pair (UTP=UNSHILDED TWISTED PAIR) and shielded twisted pair (STP=SHIELDED TWISTED PAIR). The outer layer of the shielded twisted pair cable is wrapped with aluminum and platinum to reduce radiation, but it does not completely eliminate the radiation. The shielded twisted pair is relatively expensive and difficult to install than the unshielded twisted pair cable.
11, unshielded twisted pair cable has advantages
(1) Unshielded jacket with small diameter to save space occupied;
(2) Light weight, easy to bend, easy to install;
(3) Minimize crosstalk or eliminate it;
(4) having flame retardancy;
(5) Independent and flexible, suitable for structured integrated wiring.
In these two categories, it is divided into 100 ohm cable, double body cable, large logarithmic cable, 150 ohm shielded cable and so on.