The selection of intelligent Community cabling Cable

In the construction of digital community, the choice of cable is one of the most important links. At present, several schemes are: 1, twisted pair, 2 coaxial cable, 3, optical fiber. From the practical application, because the price factor of twisted-pair cable has advantages over the latter two kinds of cable, but because it is not suitable for video demand, combined with the theoretical length can not exceed 100 meters (transmission data), so the latter two cable is worth considering. The following author will list three kinds of cable advantages and disadvantages and applications.

Twisted pair Wire

can be used to transmit analog, digital signal, its broadband up to 268KHz, in the digital signal, baseband signal when sent, its upper limit of several Mbps, For example, the total data transmission rate of T1 line can reach 1.544Mbps, can realize 15km data transmission (increase repeater), but not suitable for transmitting high frequency data, such as video. Applies point-to-point and point-to-point to multiple selection.

Coaxial cable

can be used to transmit video, data signals. When the analog signal is transmitted, its frequency can reach 300-400mhz. High-speed data transfer rate can reach 50Mbps. Typical data transmission range of 1km 10Mbps (can achieve dozens of kilometers of transmission, but need to add a repeater). The cost is higher than the twisted pair, but the number of equipment can be limited to about 20-30 units. Suitable for the transmission of video, data, etc., suitable for point-to-point, point to multi Point connection.

Fiber
　　
Not only can be used to transmit analog signals and digital signals, but also does not meet the demand for video transmission. Its data transfer rate can reach thousands of Mbps. If you do not use a repeater, the transmission range can reach 6-8km.

It is not difficult to see from the table below that the optical fiber indicators are better than the first two kinds. But because of the well-known cost factors, it seems that the use of optical fiber is not suitable. Which wiring mode should we use best?

Looking at the development of wiring system at home and abroad in recent years, we can see that three stages: 1, twisted-pair. In this phase the voice is not mixed with large-scale data communication and also adapts to such data communication. 2, coaxial cable + twisted-pair phase. It can meet the user's large amount of data transmission and video needs, but need more access equipment, the cost is relatively high, and not easy to expand demand in the future. 3, optical fiber phase. That is what we call the final stage, at this time, the corresponding ancillary equipment more perfect, data processing capacity is stronger, the expansion of better. In recent years, especially rapid development, access equipment prices have been adjusted, it can be said that this is a comprehensive communication phase of the one-step.