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Electronic Office Use NET routing network cabling FAQ situations induction and resolution


KDE - Jun 20 2014
not answered
Question:

1, why not use the debugging to test the performance of cable network?

Many users to install the double strand is not for certification testing, but in testing network debugging, when the network cable is connected when it considers that the installation of qualified. Such an approach is not only wrong but it is very dangerous. When debugging network because network traffic is very low, and users do not feel at this time there are problems, but when network traffic is high, it may appear difficult to access. Network connectivity does not mean that the cable meets the standard installation, it does not mean that when the cable network is working correctly, you can do exactly that. In addition, most users are installing a category 5 twisted-pair cable, network is running 10Base-T, but 10Base-T can run, does not mean that 100Base-TX can also run. Therefore, the installation cable can support high-speed signals must pass certification tests can prove their performance related to the, or when upgrading to high speed network only to find the cable has a problem at this time is impossible or difficult to repair.

2, what is the cable verification tests and certification tests?

Cable verification tests are test switching, the length of the cable, and twisted-pair connector is properly connected, the generic test. Validation test does not test cable electrical indicators. A cable on a certification test is based on the international standard for testing. It contains the entire contents of the validation tests and standard indicators such as attenuation, characteristic impedance of the cable, and so on. Validation test is no guarantee that the cables can be installed by a high-speed Internet digital signal, for example 10M or 10MHz. Only passed the certification test to ensure that the installation of signal cables can support up to 10M or 100M.

3 What are the standard or norm, certified Tester?

Used in field installation of cable certification testing on the current international standard ISO/IEC 11801 and TIA 568A. The former is mainly used in North America, the latter mainly used in Europe, in addition, there are also networks of cable also makes a number of provisions. But for the installation of cable certification testing is mainly made of both cable standards. Test standard (normative) includes the main content: cable-link model , requirements, test parameters, test method (content) and testing limits (the numerical values of the parameters, or method), the requirement for certification test equipment.

4, what is the TSB-67?

1995 yiqian, TIA 568A standard no on site installation of five class double twisted line (UTP5 or STP5) made provides, increasingly more of user large installation five class double twisted line to adapted high-speed network of needs, user needs on by installation of five class double twisted line for certification test, for TIA Committee Yu October 1995 announced has TSB-67 standard, it is TIA 568A standard of a attached this, only applies Yu site installation of five class double twisted line of certification standard.

5, UTP and STP cables are characterized by what?

Many users install UTP5 cable or STP5 find it difficult to make decisions when choosing between. Many users know only STP cabling UTP cable anti-interference, and Europe's main purpose is to prevent the widespread use of STP cable signal transmission cable to the external radiation interference with other electrical equipment. Than STP cable UTP cables are cheap, simple installation and maintenance, and less interference than STP cable. STP cables are more expensive than UTP and high requirements for installation, so construction costs more expensive than UTP while maintaining simple than UTP. Good noise immunity of STP than UTP and STP shields must be connected. If shields out of the question, such as improper grounding or open circuit, the consequences are counterproductive. There are no standards and methods used in field detection shielding effect, namely, performance cannot be quantitatively STP cable at the scene.

6, what is the cable link (Link)?

So-called cable link refers to a cable connection, including cables, plugs, sockets, or also include jumpers, couplers, etc. Different standards for different links, namely, test models, such as TSB-67 provides for a basic link (Basic Link), channel links (Channel). With particular emphasis on the links does not mean that cable, the cable was part of a link, if you want to install the cable system can support up to 100MHz of bandwidth , should be links to achieve this ability and not just cable.

7, what is the Super five twisted-pair and its application?

Super five twisted-pair cable is a cable manufacturer recently launched for local area network twisted pair. These manufacturers claim the Super five line can support up to 300MHz or more of the signal transmission frequency. Super five lines through which one could achieve its manufacturers claim that the frequency index aside, its practical application is not such a thing:

First, the current highest-LANs transmission frequency of no more than 100MHz,100Base-TX this relatively new fast Ethernet and no more than 100MHz the transmission frequency, so haven't seen its practical application in the near future where;

Second, cable is different from the link cable 300MHz transmission frequencies can be achieved, but does not mean links can at such high frequencies. Because the link is made of cables, plugs, socket-outlets and couplers, distribution frame composition. If you want to get super five links, must ensure that the links in all of the components must meet the criteria for Super five. Only cable for Hyper-v and the link is not up to Super five are moot.

Third, current installed Super five-link, there is no way for their certification tests on the spot, meaning that there are no standards in field testing of these real-world performance of high speed cable. Since there is no way to check the installation cable is able to achieve Super five performances , and therefore cannot be fundamentally guarantees the actual investment.

8 exception, what is the impedance (Impedance Anomaly)

Impedance is an electric indicator of cable, the cable should be a constant in. If the impedance of the cable is not a constant, impedance change in place will produce reflection. DS100 and DS2000 Fluke companies reflect the default values using 15% to report abnormal impedance, that is, if an exception report of the reflected signal over 15% impedance. DSP100/2000 can be the characteristic impedance of the curves are drawn. Ideal curve is a straight line. If the impedance is abnormal, the curve appears in the peak or trough. Wave impedance increases, trough that impedance decreases







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