Network tester, also known as professional network tester or network tester, is a portable and visual intelligent detection device that can detect the physical layer, data link layer and network layer operation defined by the OSI model. It is mainly suitable for LAN. In fault detection, maintenance, and cabling construction, the network tester functions include the physical layer, the data link layer, and the network layer.
Network tester classification1. The network tester can be divided into two types according to the network transmission medium: a wireless network tester and a wired network tester.
2. The network tester can be divided into cable detector, multi-function network tester and network performance tester according to functions.
3. The network tester can be divided into network construction equipment and network maintenance equipment according to the purpose.
LAN management
With the rapid development of the network, the stability and security of the network has become very important in enterprises and institutions, the responsibility of network administrators has also increased, and heavy network failures will follow. Network testers are such a kind. A good helper for network administrators to solve problems.
Integrated wiring
In the network cabling construction, detecting the quality and length of the cable connection and the positioning of the cable port is a cumbersome task. The network tester can help the builder to make quick and accurate judgments.
data center
The data center's network is in a critical position, and the network tester can help network maintenance personnel quickly locate faults.
Width business
User broadband failure is the biggest headache for broadband service companies. Whether to solve faults quickly and the stable operation of the network directly affects the company's image and reputation. Network testers are an indispensable tool for technical support personnel.
Network room
The failure of the equipment room is very frequent, and the network tester can reduce the time for the administrator to troubleshoot the fault.
According to the far-educated NS-468 computer network tester physical mapping and power output schematic diagram as shown in the drawing, the number of the components in the figure is the author's note, easy to read the picture. The method of using the network tester is not explained here. Please refer to the instruction manual supplied with the tester. The following describes how the network tester works.
The K31 is a power switch. The K32 is a fast and slow test changeover switch and the K32 is closed for a slow test. Transistors T31, T32 and peripheral components form a clock pulse forming circuit that provides a clock signal for U21. Whether the clock pulse forming circuit works normally is reflected by the LED 31 display. The integrated circuit U21 (model MC14017B) is a decimal counter. The clock pulse is input from the CLK pin, and the high and low levels are sequentially output from the Q0 to Q7 pins. The on/off condition of the 8 cables of the scan network cable is turned on, and the cable is turned on, off, or shorted. LED11 to LED18 and LED21 to LED28 display reflections. For example, Q0 outputs a high level (Q1 ~ Q7 output low level) at a certain moment, the current from Q0 → LED21 → CN21 (RJ45) → the first cable of the network cable → CN11 (RJ45) → LED11 → D12, D13 → CN11 ( RJ45)→3rd, 4th cable→CN21(RJ45)→D22, D23→Q2, Q3 form a loop. The LED21 of the main tester and the LED11 of the remote test end are illuminated, indicating that the first cable of the network cable is open. . The principle analysis of the other seven roads is similar.
Network tester common fault repairFirst, the power switch K31 is closed, and the LED 31 is not blinking. There are two main situations in which this failure occurs:
1. The battery power is insufficient. Use the multimeter DC10V file to measure the battery terminal voltage. If the battery terminal voltage is too low, replace it with a new 9V stacked battery.
2 . Most of the time, the triode T31, T32 and peripheral components have a virtual soldering, and the clock pulse forming circuit stops. The U10 pin 14 level can be tested with the multimeter DC10V file. If the multimeter pointer is not observed periodically, the clock pulse forming circuit is stopped. Find the solder joints and repair the solder.
Second, testing the well-known network cable, LED31 flashes, but LED11~LED18 and LED21~LED28 have no light-emitting display, or only partial light. There are two main situations in which this failure occurs:
1. Most of the time, some components of LED11~LED18 and LED21~LED28 are soldered, and even if the LED is pressed during installation, the pin is separated from the PCB. Find the solder joints and repair the solder.
2. Improper use, static electricity damages U21; or live test network cable, telephone line damaged U21. Use the multimeter DC10V file to test the 3rd, 2nd, 4th, 7th, 10th, 1st, 5th, and 7th pin levels of U21. Normally, each pin should have a periodic high-level pulse output, otherwise U21 will be damaged. Replace with the same type of integrated circuit.
How to use the computer network cable testerNowadays, cables are used in all aspects of people's production and life. Therefore, mastering the operation method of the network cable tester is the most basic requirement of the most cable users. How to use the network cable tester? Let me introduce you to the following.
1. Insert the two ends of the network cable above the main auxiliary test line, and insert any head at will;
2, then open the switch of the line meter;
3. Observe that the indicators of 1-8 on the main and auxiliary line tester are not lit, and the order of the lights is correct.
4. For example, if the 1 light on the main line meter is on, the 1 light on the auxiliary line meter should also be on. If the 1 light on the main line meter is on, and the 2 lights on the auxiliary line meter are on, it means that the network cable is faulty and cannot be used normally.
5, 8 lights, as long as 1, 2, 3, 6 lights, the network cable can be used, because the data is transmitted through the four lines, the other four lines are not used to transmit data.
There are two criteria for the order of the network cable:
1: T568-B standard, the order is orange white, orange, green white, blue, blue white, green, brown white, brown.
2: T568-A standard, the order is green white, green, orange white, blue, blue white, orange, brown white, brown.
The first standard is generally used.
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