Discuss the impact of temperature on the Integrated Wiring System

The temperature has a great impact on the bandwidth of the Integrated Wiring System. Many people do not know much about this. The following describes the impact of temperature on the Integrated Wiring System, I hope you can learn more.

Channel bandwidth is one of the most important parameter indicators to judge the performance of the Communication Integrated Wiring System. The difference between the next-generation standard, for example, 6 or 7, and the original low-level standard lies in the difference in available (valid) bandwidth. In general, higher bandwidth in the cabling system means higher data transmission rates.

What is bandwidth?

In a copper integrated cabling system, the bandwidth of A-meter twisted pair channel is usually expressed in MHz. Channel bandwidth refers to the channel frequency range without changing the signal-to-noise ratio. For the concept of bandwidth, see. Today, most LAN systems need to control the noise source from the near-end crosstalk (NEXT) between the transmission line pair and the receiving line pair ). When all the nearby crosstalk sources are taken into account, the signal-to-noise ratio measured in decibels is the same as the cumulative power attenuation crosstalk ratio (PSACR. The goal of the six standards is to control the cumulative power attenuation crosstalk ratio (PSACR) within the frequency range of MHz bandwidth to a value greater than zero, the available bandwidth can be twice that of the five integrated wiring systems.

There is a basic relationship between the channel bandwidth measured in MHz and the information transmission capability or data transmission rate measured in Mb/s. You can use the traffic flow of the main highway to visually describe the relationship between Bandwidth and data transmission rate. The bandwidth can be used as the number of lanes on the expressway, and the data transmission rate can be used as the traffic or the number of vehicles passing through each hour. One way to expand traffic is to widen the expressway, while the other is to improve road surface quality and eliminate bottlenecks. Similarly, it is possible to enable each Hz frequency in the available bandwidth to carry more information bits, but this requires a better signal-to-noise ratio.

The relationship between Bandwidth and information transmission capabilities was discovered long ago by a person named clude Shannon who was an engineer at Bell's telephone lab. Therefore, this rule is called Shannon's law.
Factors Affecting bandwidth

A Class 6 standard channel should be designed to have lower signal attenuation and better near-end crosstalk characteristics than Class 5 standard channels. Lower signal attenuation can be achieved through the use of copper media cables of a slightly heavier specification, with a diameter between 0.5mm (24AWG) and 0.6mm (23AWG. Two available cables are included in the scope of consideration of TIA's 6-class Draft Standard Specification. At MHz bandwidth, the signal attenuation of these six types of cables is nearly 2 dB and 4 dB lower than that of the five types of cables. In the same MHz bandwidth, the two types of 6 cables are nearly 12 to 18 decibels lower than the near-end Crosstalk of the five types of cables.

Temperature Effect

Signal Attenuation of cables is greatly affected by temperature. Each time the temperature increases by 10 degrees Celsius, the signal attenuation of the cable increases by 4%. This means that the signal attenuation of the 92.6-meter cable at 40 degrees Celsius is the same as that of the 100-meter cable at 20 degrees Celsius. Therefore, the effect of temperature on signal attenuation is much greater than that of many other fixed factors. The effect of temperature on bandwidth is so significant. Table 1 compares the bandwidth values of enhanced 5 standard cabling systems and 6 standard cabling systems at different temperatures.
Cables are usually installed in a place with high ambient temperatures such as ceiling and air duct. A recent study by the University of California's Lawrence Berkeley National Laboratory showed that the temperature of Exhaust pipes in many steel-concrete buildings can reach 49 degrees Celsius in the Midsummer season. However, the temperature of cables may be high in factories and other environments.

NORDX/CDT advocates the use of low-attenuation generic cabling systems to meet the requirements of Class 6 standard cabling systems to reach the target bandwidth of MHz at a reasonable minimum temperature of 40 degrees Celsius. IBDN4800LX is a new generation of six types of cables to meet this requirement. It provides highly scalable channel bandwidth and supports transmission rates up to 4.8 Gb/s, and overcome the problem of reducing system performance in a high-temperature environment, this gives ieee lan device developers a satisfactory response to the proposal that "Improved attenuation performance" is more important than improving crosstalk performance for next-generation cabling systems.

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