preface
Company recently received a number of user calls, consulting their network in use by gigabit automatically reduce the part information for MB (project delivery use less than 1 year), communication that is used when the user acceptance of the fault information FLUKE test equipment, test performance meets the requirements, further communication that choose channel as acceptance test standard, namely each information point contains a permanent link and two user data jump line.
Aiming at this problem, we are analyzed from the following several aspects:
1, the actual use of the channel line and test are the same, that is the actual user of jump line and test whether the jumper wire for the same root jump line.
2, the network environment is normal, as is known to all the current network equipment (nic) is with the adaptive function, when the network environment change automatically switch to the gigabit correlates or application state.
3, in the process of using network line is damaged, such as modules, crystal head is damaged by corrosion, etc.
Because the network device has the characteristics of the adaptive selection priority gigabit, in use process with an increasing number of bit error rate and cumulative, could eventually lead to gigabit network automatic cut for MB. So I consulting company users, through experiment study, it may be the biggest users of jump line defects in performance, this article will focus on from two aspects of standard to the application for the analysis of user jump line relationship with the system performance.
Different test model analysis
We know the FLUKE test equipment when choosing "Channel" test model testing, does not contain access adapter jumper wire connectors on both ends (crystal), equipment on both ends of the test will be deducted automatically link the influence of crystal head, in other words, is used to test the jumper crystal head performance is good or bad, basic will not affect the final test results, while the actual network applications cannot be ruled out jumper crystal head.
To ensure that the network can run in the condition of gigabit stable, physical wiring needs to achieve what kind of performance acceptance, which can guarantee?
End-to-end network device communications Link in the standard (Channel) is defined as a Channel, a Channel Link contains a horizontal Link, 2 users jump line, when the horizontal Link USES the permanent Link "Perm. Link" model, jump line using jumper monomer "Patchcord" model test and meet the requirements, respectively, the Channel Link to meet the requirements. Test standard link, according to the relevant provisions of the standard TIA568 channel model is as follows:
The acceptance tests in the actual project, in order to choose FLUKEDTX1800 tester, for example, the different test model corresponding to the FLUKE test adapter such as table 1.
Through the above analysis, in order to get a stable and reliable network applications, project acceptance level link should choose a permanent link model test, the jumper should choose corresponding jumper monomer model test. According to the regulations of TIA568 standard: jump line unit testing parameters in return loss and crosstalk proximal than channel test parameters, the remaining amount (≧ 16 MHZ) under high frequency higher than 5 db, respectively, and the higher the frequency the greater the gap. Performance parameters of the comparison of different test models are shown in table 2.