The influence of integrated wiring test model on network application

The author of the company recently received a number of user calls, consulting their network in the use of some of the information points will be automatically reduced by Gigabit (project delivery less than 1 years), the communication that users of these fault information points when acceptance using fluke equipment for testing, test performance to meet the requirements, Further communication The selection channel is used as acceptance test standard, that is, each information point contains a permanent link and two user data jumpers.

To address this problem, we have analyzed the following aspects:

1, the actual use of the channel line and test channel is the same, that is the actual use of the user jumper and test the jumper used is the same root jumper.

2, the network environment is normal, it is well known that the current network equipment (NIC) is an adaptive function, when the network environment changes will automatically switch to gigabit or hundred megabytes of application state.

3, the use of the network line is damaged, such as the module, Crystal Head is corrosion, damage and so on.

Because the network equipment has the priority adaptive choice Gigabit characteristic, the use process along with the bit error rate unceasing increment and accumulates, may eventually cause the gigabit network to reduce automatically to hundred trillion. Therefore, the author of the company's user consulting situation, through experimental analysis, the most likely occurrence of the user jumper performance defects, this article will focus on the two aspects from standard to application to analyze the relationship between user jumper performance and system.

Analysis of different test models

We know that fluke test equipment in the selection of the "Channel" test model for testing, does not include both ends of the access Adapter Jumper Connector (Crystal Head), the device will automatically deduct the impact of the chain at both ends of the crystal head, in other words, the jumper used to test the performance of the Crystal Head, Basically will not affect the final test results, and the actual network applications can not eliminate the impact of the jumper Crystal head.

In order to ensure that the network can be stable in the gigabit state of operation, physical wiring needs to achieve what kind of performance, what kind of acceptance can be guaranteed?

End-to-end Network device communication links are defined as channels (Channel) in the standard, one channel link contains a horizontal link, 2 user jumpers, when the horizontal link with the permanent link "Perm." Link "model, jumper using the jumper monomer" Patch cord "model test and meet the requirements, then this channel link will be able to meet the requirements. According to the standard TIA568, the standard link and channel test model are as follows:

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TIA Cat6 Perm. Link Permanent link test model

Channel Channel test model for TIA CAT6

In the acceptance test of the actual project, to select Fluke DTX1800 Tester As an example, different test models correspond to fluke test adapters such as Table 1.

Table 1 Fluke different test model adapters

Test model	Perm. Link	Channel	Patch Cord
Adapter	dtx-pla002	dtx-cha002	Dtx-pcu6/mn	Dtx-pcu6/sr
Note		Additional 2 test jumpers are required	Host side	Distal

Through the above analysis, to obtain the stable and reliable network application, the horizontal link should select the permanent link model to test in the project acceptance, and the jumper should select the corresponding jumper monomer model test. According to the TIA568 Standard stipulates: The jumper monomer test parameter in the Echo loss, the near end crosstalk aspect compared to the channel test parameter, the remaining quantity at the high frequency (≧16mhz) respectively higher than 5dB, and the frequency higher the difference is bigger. Comparison of performance parameters under different test models is shown in table 2.