Shielding Integrated Wiring can provide higher performance

To compare the performance of Integrated Wiring, we must first start with the data transmission quality. The basic parameter for measuring the quality of data transmission is the error rate, but the error rate cannot be measured in the field. The following figure shows a model for measuring the error rate in the laboratory.

This test model is used to compare the error rate of unshielded and shielded cables. The test results are as follows:

The test results show that the bit error rate and unshielded state are at the same order of magnitude, or even higher than that of unshielded state. After shield grounding, even if it is single-ended grounding, the error rate is two orders of magnitude lower than that of unshielded grounding. As long as the shield cable is grounded, the transmission quality is much higher than that of the unshielded cable.

According to the Shannon theorem

Maximum data transmission rate (bps) = bandwidth x Logv (1 + SNR)

Note: SNR is the abbreviation of SNR.

From this formula, we can see that the two factors that affect the maximum data transmission rate are bandwidth and noise.

The bandwidth of shielded and unshielded cables in the same category is the same, but the noise suppression capability is significantly different.

STP: The maximum noise level allowed on the cable shielded from grounding is:

0.5V   (with 40 dB screen efficiency)

UTP: Maximum allowable noise level on the cable: 0.015 V

The noise level of STP on the grounding system is more than 30 times that of UTP !!

As a result, we can see that the shielding system has inherent advantages over the unshielded system in terms of noise resistance.

In areas that need to prevent interference, such as hospitals, industrial environments, and confidential units, shielding systems is the best option.

With the development of technology, in order to make the cable data transmission rate higher and higher, the data encoding level is increasing, and the electrical adjustment of signals is also getting smaller and smaller. For example, in the 1000BASE-T standard, the Electrical adjustment of signals sent using PAM5 encoding is 0.5 V, while in the 10GBASE-T standard, the Electrical adjustment of signals sent using PAM16 encoding is only 0.13 V.

Therefore, noise suppression becomes more and more important. In 10GBASE-T, a new test parameter is added: External crosstalk.

External crosstalk is the crosstalk between cables or modules. Although it has existed for a long time, it was not required to be tested in the gigabit network era.

The following table shows that the original unshielded 6 categories cannot meet the requirements of 10GBASE-T applications. Only the improved 6A unshielded system can meet the requirements of 10GBASE-T applications.

Is the PSAXT Value Comparison for shielding 6 categories and unshielded 6A Systems

We can see that shielding 6 is equivalent to unshielded 6A. The PSAXT margin is 40 dB high!

The following list compares the xiangqiang channel capacity of 10GBASE-T applications, and uses the unshielded 6A system as the reference.

Cabling link Channel capacity Comparison Attainable data rate IEEE 802.3 cabling 21.3 GBit/s 100% 10   GBit/s (Cat. 6 U-UTP) Shielded Cat. 6 cabling 25.4 GBit/s 119% 11.9 GBit/s Cabling with Cat. 7 cable 25.8 GBit/s 121% 12.1 GBit/s and Cat. 6 connector system Cat. 7 cabling 25.9 GBit/s 122% 12.2 GBit/s (Cable and connector)

It can be seen that the channel capacity of the shielding system is much higher than that of the 6A unshielded system, which means that in a real working environment that is worse than the laboratory environment, the use of shielding systems ensures the transmission performance of your system.

It's time to use blocking technology!

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1. Shielding technology in Integrated Wiring System
2. Shielding and unblocking system for network cabling