(Illustration) Prerequisites for Network Construction: network cable production

(Illustration) Basics of network formation: network cable production-Linux Enterprise Application-Linux server application information. For details, see the following. Differences between express connect and crossover
Main Line, that is, Express Line
, Standard 568B): the two ends have the same line sequence. The line sequence from left to right is: White orange, orange, white green, blue, white blue, green, white Brown, and brown.
Reverse line, that is, cross Line
, (568A): one end is the line sequence of the positive line, and the other end is from left to right: white green, green, white orange, blue, white blue, orange, white brown, brown.
Which of the following is the correct choice for the main line and the reverse line when various devices are connected. The HUB represents the HUB, the SWITCH represents the SWITCH, and the ROUTER represents the ROUTER:
PC-PC: reverse line
PC-HUB: Main Line
HUB-HUB common port: Anti-line
HUB-level connection: Anti-line
HUB-HUB common port-level connection port: Main Line
HUB-SWITCH: Anti-line
HUB (cascade Interface)-SWITCH: Main Line
SWITCH-SWITCH: Anti-line
SWITCH-ROUTER: Main Line
ROUTER-ROUTER: reverse line
100BaseT connected to twisted pair, with 100 Mbit/s eia/TIA
568B is the standard specification.
　　 The procedure is as follows:
Step 1: Use the oblique port to cut down the required twisted pair length, at least 0.6 meters, no more
100 meters. Then, remove the outer skin of the twisted pair (which can be used to cut anything) with 2-3 cm pairs.
Some twisted pair cable contains a soft nylon rope, If you strip out the twisted pair outer skin, feel exposed part is too short, and is not conducive to the production of RJ-45 connector, can hold the twisted pair outer skin, hold the Nylon Wire and peel it off to the bottom of the outer skin to obtain a longer exposed line. ()



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Step 2: The twisted pair cable after wire stripping is completed, as shown in the right figure.



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Step 3: Perform the cabling operation. Place the orange pairs in the exposed twisted pair wires to the front of the wire, and the brown pairs to the front of the wire. The green pairs to the left and the blue pairs to the right ,.
Upper: Orange left: Green lower: Brown right: Blue



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Step 4: place the green and blue pairs in the middle, while the orange and brown lines remain unchanged,
That is, it is placed on the outside ,.



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Left one: Orange left two: Green left three: Blue
Left 4: Brown
Step 5: carefully strip each pair of cables, because we follow the EIA/TIA 568B standard to create connectors, so the lines have a certain order of color ().



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Note that the Green Line should span the blue line. The easiest thing to make mistakes here is to put the white green line and the green line together.
This will cause crosstalk and reduce transmission efficiency. From the left: White orange/white green/blue/white blue/green/White brown/brown common error method is to put the green line at the position of 4th feet ().



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It is correct to place the Green Line in the position of 6th feet, because in the 100BaseT network, the 3rd and 6th feet are the same, so the same pair of residual needs to be used. (See Standard EIA/TIA
From the left: White orange/white green/white blue/White brown/brown
Step 6: Cut bare twisted pair wires with scissors or diagonal pliers
14mm length, the reason for leaving this length is to comply with EIA/TIA standards, you can refer to the relevant RJ-45 connector and twisted pair production standards. Finally, put each wire of the twisted pair into the pin of the RJ-45 connector in sequence, the first pin should put white orange lines, and so on,



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Step 7: confirm that each wire of the twisted pair has been correctly placed, you can use the RJ-45 crimping clamp to crimping the RJ-45 joint, as shown in the right figure
There is also a kind of RJ-45 joint protective cover on the market, can prevent the joint in the pull caused by poor contact. When using this protective sleeve, you need to put this rubber sleeve in the twisted pair cable before the crimping RJ-45 connector ,.



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Step 8: Repeat steps 2 through 7 before creating the RJ-45 connector for the other end. Because the workstation is directly connected to the hub, the pin connection of the RJ-45 connector at the other end is exactly the same. After the completion of the connection lines at both ends of the RJ-45 connector both pin and color are complete ~ This method is applicable to ADSL.
The connection between the MODEM and the computer Nic, and between the computer and the hub (switch. The completed RJ45 connector is shown in.



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Cross-network cable for ADSL
The connection between the MODEM and the HUB (not all of which are related to the MODEM design), the connection between the HUB and the HUB does not pass through the level-1 connection port, and the two computers directly connect to each other through the NIC. The production method is basically the same as the above, but the online order is not like 568B. It adopts the 1-3, 2-6 exchange method, that is, one uses 568B for production, and the other uses 568A for production.



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