The LED display is composed of a single box or a set of LED modules spliced together. In the splicing process, network cables and various twisted pairs are inevitably used, and then used for LED display engineers. How do you splice these cables and twisted pairs? The following LED display manufacturer Hualinuo will introduce to you in detail:
Wire sequence of various network cable connectors
The wiring method is applied in the entire network wiring, but the network connection of the RJ45 ends at both ends is common in the network, whether it is terminal mode A or terminal mode B. In fact, most of them use the T568B standard, which is generally considered to be better Shield electromagnetic interference.
In addition, computer communication only uses 1.2.3.6 (white-orange, orange, white-green, green), four-line 10 100M network card, and Gigabit network card must have 8 lines, so that you can use another 4 telephone lines to save 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. The network measuring instrument bounces light: 1 2 3 6→1 2 3 6
Reverse line (ie cross line): select the line sequence of 568B at one end and the line sequence 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. The network measuring instrument bounces light: 1 2 3 6→3 6 1 2
Positive line (ie straight line): select the 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 bounce 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 sequence of 568B at one end and the line sequence 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. The network measuring instrument bounces light: 1 2 3 4 5 6 7 8→3 6 1 4 5 2 7 8
Positive line (ie straight line): select the 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. The network measuring instrument bounces: 1 2 3 4 5 6 7 8→1 2 3 4 5 6 7 8
Reverse line (ie cross line): select the line sequence of 568B at one end and the line sequence 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 bounces: 1 2 3 4 5 6 7 8→3 6 1 7 8 2 4 5
Correctly choose 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: Crossover cable
PC-HUB: straight line
HUB-HUB commonly used port: cross line
HUB-HUB (universal port-level port): straight
HUB-HUB (horizontal port-horizontal port): crossover cable
HUB-SWITCH: Crossover line
HUB (cascade port)-SWITCH: straight
SWITCH-SWITCH: Crosshair
SWITCH-ROUTER: straight line
ROUTER-ROUTER: Crosshair
9. Issues involved in twisted pair applications in Gigabit networks
(1) Gigabit backbone switch, which line is connected to Gigabit switch? Category 6 line (CAT6).
(2) Gigabit backbone switch, which line is connected to hundreds of megabytes switch? Category 6 line (CAT6).
(3) Gigabit backbone switch to connect the new server, what line? Category 6 line (CAT6).
(4) Gigabit backbone switch to connect to the old server, what line? Super Category 5 (CAT5E), running 100Mbps.
(5) Gigabit switch, new machine, 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 it could not be moved, if the quality is too bad, cut it off, the new cloth will exceed Category 5 (CAT5E).
10. Ordinary twisted pair
The common types of twisted-pair cables are Category 3, Category 5 and Category 5, as well as the latest Category 6 cable. The former has a thin wire diameter, and the latter has a thick wire diameter. The model is as follows:
1) Category 1 line: mainly used for transmitting voice (a standard mainly used for telephone lines before the early 1980s), which is different from data transmission.
2) Type 2 line: The transmission frequency is 1MHZ, used for voice transmission and data transmission, and the maximum transmission rate is 4Mbps. Is it often used for old tokens that use the 4MBPS standard token transfer protocol?
3) Category 3: Refers to cables currently specified in ANSI and EIA/TIA568 standards. The transmission frequency of this cable is 16 MHz, used for voice transmission and data transmission, the maximum transmission rate is 10 Mbps, mainly used for 10BASE-T.
4) Category 4 cables: The transmission frequency of this type of cable is 20 MHz. The data transmission of voice transmission and the maximum transmission rate of 16 Mbps are mainly used for token-based LAN and 10BASE-T/100BASE-T.
5) Category 5 cable: This type of cable increases the winding density. The sheath is a high-quality insulating material with a transmission rate of 100MHz. It is used for voice transmission and data transmission. The maximum transmission rate is 10Mbps. It is mainly used for 100BASE- T and 10BASE-T network. This is the most commonly used Ethernet cables.
6) Super Category 5: Super Category 5 has low attenuation, low crosstalk, higher attenuation and crosstalk ratio (ACR) and signal loss rate (structure return loss), smaller delay error and very good performance. Great improvement. Category 5e cables are mainly used for Gigabit Ethernet (1000 Mbps).
7) Category 6 cables: The transmission frequency of this type of cable is 1MHz~250MHz. The integrated attenuation crosstalk ratio (PS-ACR) of Category 6 cabling system at 200MHz should have a large margin, which is twice that of Category 5 Super. bandwidth. The transmission performance of Category 6 cabling is much higher than the Category 5 standard, and it is most suitable for applications with a transmission rate higher than 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 types of standards. The wiring standard adopts the star topology structure. The required wiring distance is: the length of the permanent link cannot exceed 90 meters, and the channel length cannot exceed 100 meters.
At present, twisted pair 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 the radiation has not been completely eliminated. Compared with unshielded twisted pair cables, shielded twisted pair cables are relatively expensive and difficult to install.
11. Unshielded twisted pair cable has advantages
(1) Small diameter without shielding jacket, saving space;
(2) Light weight, easy to bend and easy to install;
(3) Try to reduce or eliminate crosstalk;
(4) It is flame retardant;
(5) Independent and flexible, suitable for structured integrated wiring.
In these two categories, it is divided into 100 ohm cables, twin cables, large logarithmic cables, 150 ohm shielded cables and so on.
