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InFocus News: Fiber Common Troubleshooting Methods!

    Fiber in the past was just to meet the needs of high-performance systems, but now it has appeared in various types of networks. If you are very familiar with copper wire,booster cables then you will soon find a kind of fiber is something completely different.
    Not only because of the installation process and copper very different, and troubleshooting tools are also very different. Relative to the copper wire, the fiber is more fragile,battery clip so there will be some potential use of the fault.

    The most common fiber failure.

    Done troubleshooting any network professionals are aware this is a complex process. tow rope So know where to start looking for faults is very important. Here are some of the most common fiber failure, ratchet tie dowm and possible factors produce these faults, this information will help users of network faults are educated guesses.

    Fiber fracture is usually caused by physical compression or excessive bending force;

    Transmission power is inadequate;

    May result in the laying of long distance optical fiber signal loss;

    Connector may cause damage to loss of signal;

    Fiber optic connectors and connectors (connectors) failure may result in loss of signal;

    Excessive use of fiber optic connectors and connectors may result in loss of signal;

    Optical Fiber Distribution plate (patchpanel) or welding plate (splicetra) connection failure.

    Generally speaking, if the connection is completely unreasonable, then it may be the fiber fracture. But if the connection is intermittent, there may be the following reasons:

    Junction or a combination of poor production levels caused by excessive number of fiber attenuation serious;

    Due to dust, fingerprints, scratches, humidity and other factors that damage the connector;

    Transmission power is too low;

    Errors in the wiring between the connectors.

    Collection of information.

    Whenever I was sent to a new network environment to deal with the problem, I want to do first thing is to collect performance and possible causes of failure of basic information. Using any available means, the key to troubleshooting by asking the right questions to obtain valuable information. The following gives some first question should be raised.

    If anyone has recently been moving fiber (removal and re-connection), or moving too PC?

    To find out whether PC has recently disconnected or moving very important. If you disconnect the fiber-optic cable from a PC, it is likely that cable simply has not been correctly connected, or reconnect the time is a problem, or when the fiber is disconnected received damage.
    PC hardware changes are done?

    PC hardware upgrades may also cause problems. Cable may disconnect, or no re-connection, or connection is not correct, or fiber damage before re-connecting. Similarly, the hardware is entirely possible the process of upgrading fiber has not been disconnected. If this is the case, there may be optical fiber to be pulled when moving PC, or PC chassis accidentally hit the back of the wall and crashed connector.

    There may be no damage or fiber pull, but new hardware makes the NIC does not work. The solution is by changing the operating system to determine whether the problem is the NIC. Of course, if you are using Windows9x, Me, 2000 or XP, Device Manager can be (DeviceManager) to check the system hardware to determine if any equipment is working properly.

    If possible, I also recommend new hardware temporarily taken down, go back to the early state. It can analyze whether the problem is caused because the system's new hardware, or other reasons.

    Is moving through the device recently?

    I've lost count of how many times I have dealt with the copper network failure was caused by going too fast led to the original table and close to the wall, or vacuum cleaners do occasionally move the table clean. Unplug the network cable without moving the table and when the cable is likely to be pulled over, or is suppressed or roll off the table. If such action will damage to a copper wire, then imagine what this will bring the consequences of fiber, but it is made of glass.

    Recently, some people (such as telephone company employees) in the building construction it?

    This seems a strange question, but in my experience, failure, and phone company employees often visit the same time. Telephone company technician may cut cable, pulled the plug, and make anything you might think. I'm not going to speculate the logic behind such an act, but if the network is a problem and you were told yesterday I was in the building for installation of telephone or other electrical construction, you may be able to find a good solution to the problem entry point.

    Fiber is being stepped on, or chair, feet are crushed, or by other physical oppression?

    Every time I hit the mark and the end-user issues acknowledged they do, I will be stunned. If you use a good way to ask the user how much power cable to withstand the physical pressure, they usually will tell you the correct answer. But the need to remember that the vast majority of users do not know or bend the fiber being trampled by the chair too much and grind grind of going to be broken.

    Fast but not accurate testing.

    In dealing with a specific problem, time is often a key factor. Back to online users need to work as soon as possible, and I will have a lot of other work to do. For this, I always diagnose a problem out as quickly as possible in what place.

    There is a very scientific but very effective way to start troubleshooting. I first disconnect the fiber ends, and then align the optical fiber of a section of the laser pointing, to see whether there is light out the other side, as shown in Figure A below. If you do not have the laser pointing device, a bright flashlight can be, as shown in Figure B. Originally designed for fiber optic transmission of light, so you do not need to worry about very precise alignment light source cable.

    If there is no light through the cable, then fiber to do this is damaged, it needs to be replaced. If the light is indeed through cable, the cable does not necessarily able to explain to work properly. This only shows that the internal optical fiber cable is not completely broken. However, if the optical cable through the cable and within a hundred meters in length, then the cable can usually be well used.

    Other diagnostic techniques.

    If the laser pointing devices and flashlights light to pass through the cable, and now to the need for further time to diagnose. In addressing such issues, I tend to use process of elimination.

    I usually unplug the computer in question from the optical fiber plug, and then I'm sure the work of a normal PC or laptop computer connected to the cable on. If this function can operate a network PC, then I'm sure not a cable problem. NIC may be damaged, or configuration problem so the computer can not correctly identify the NIC. For example, NIC with the system may conflict with other devices, or must the DLL file corruption.

    If this had a working cable connection after the computer can not access the same network, then the problem lies in the cable on either, or a broken connection in another port. Let the units to maintain a normal PC and cable connection, and then can determine the other end to a working port. If the PC is still unable to connect the network, then the cable does have problems. On the other hand, if the PC network started to work, then the problem lies in the original port.

    But sometimes you can not use exclusion. For example, you do not have extra or spare computer port, or cable over a long distance, etc., will make troubleshooting such methods could be implemented. If this is the case, we have some other troubleshooting methods and tools.

    Diagnostic tools.

    Perhaps you noticed in my list of issues of common optical fiber, the signal attenuation is a frequent word. Fortunately, there is a test known as signal attenuation (losstesting) fiber optic technology can be used to measure the degree of signal attenuation.

    The technology needed to receive a power generator, a light table. You can set you wish to be tested by light signal generator, and dBm range of wavelengths. And then received a power meter on the light generator, power meter will detect the signal and gives the signal attenuation of the report. In general, the measurement of the unknown cable, you'll need to work have been identified using a normal cable as a reference, to establish a measurement baseline. If the unknown cable is no problem, then it lost the signal measurement data cable should be measured with reference values.

    But I can not tell you what degree of signal loss will cause problems, as it largely depends on the cable and physical environment. However, here is give some guidance you can refer to. Remember, these are only guidance. As you and I are different types of cable, so you come here, the data may be very different data:

    Signal through each connector will be 0.5-db attenuation, the maximum attenuation of 0.75dB;

    Each optical signal through the junction will be 2dB attenuation;

    If you use single-mode optical fiber, every 600 feet is expected to decay 0.1db;

    If you are using multi-mode optical fiber, every 100 feet is expected attenuation 0.1db.

    You need based on the actual test equipment you use different types of cables and connectors and different. Obviously, not every connector can be connected to the test instrument. Similarly, the design can not be expected to test the equipment to test single-mode fiber multimode fiber. In the market can see a lot of different fiber test equipment. Some test equipment can only test a fiber, while others can test a variety. In my opinion, FlukeNetworks the production of network test equipment is the best.

    Optical microscope.

    I have already mentioned, fiber contamination is also a problem. Fiber by the pollution came from dust, scratches, fiber optic connector end of the epoxy resin and things. Check the problem, like pollution, such as fiber optic best way is to use optical microscope.

    Optical microscope is a special microscope designed for observing fiber. Usually the price of optical microscopy from 100 dollars to 800 dollars.

    If you are considering the purchase of a fiber optic microscope, in addition to price, there are also factors to consider. The first point is you should check the plug, so you can easily hold the cable. Needs a lot of cheap, portable microscope, and when you took the fiber. In the high magnification of the case, do not need to hold optical fiber, through a microscope can check them thoroughly.

    The next point to note is that magnification. Generally speaking, optical microscope magnification range from 100 times to 400 times. The higher the magnification, you can see more details of the fiber.

    Finally, how are you need to check the microscope is the optical or electronic. Many high-end optical microscope is actually displayed on the video display image, without the lens barrel through a microscope for observation. Such a system can usually 3mm fiber end enlarged to the size of a tennis ball.

    A fame PriorScientific the company has produced a fiber optic microscope software. This fiber optical microscope can be checked on all the subjective factors will be excluded. Software provided by the microscope to find specific details on the image, and then evaluate the images of the fiber.

    Not your fault.

    As the material of glass, fiber is indeed very fragile. You can tie a knot and then went on copper use, but when you are dealing with optical fiber and the need to wear leather gloves carefully. Starting from the use of fiber, you will encounter a variety of accompanying problems. Understanding of the causes fiber problems and countermeasures will help solve these problems without having to give up the use of pain.

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