Cable transmission distance has always been a concern of the weak, we deal with cables every day, clearly understand the use of cables in order to be handy in the project, let's understand the commonly used cable transmission distance.

Net cable

Grid lines, also known as twisted pairs, have different transmission distances according to different network cables. The network cable is in the transmission of network signals, if more than the cable itself can withstand the distance, the signal will be attenuated, in serious cases, the network signal will be interrupted.

Five, six are 100 meters, the normal oxygen-free copper level 6 can reach about 120 meters, if you want to increase the transmission distance, you can install Repeaters between two sections of twisted pair, you can install 4 Repeaters. If four Repeaters are installed to connect five network segments, the transmission distance can reach 500 meters.

Optical fiber

The transmission distance of the network is limited and can not solve the problem of remote data transmission, so optical fiber can also be used for long-distance transmission.

Optical cable is divided into multi-mode and single-mode, multi-mode transmission distance is long, but shorter than single-mode. For 10mbps and 100mbps Ethernet, multi-mode fiber can support a transmission distance of 2000 meters; In a 1GbpS gigabit network, multimode fiber can support a transmission distance of 550 meters; Therefore, multi-mode is used less now.

In 100Mbps Ethernet Ethernet to Gigabit Ethernet to Gigabit network, single-mode fiber can support more than 5000m transmission distance than multi-mode fiber.

The devices used in single-mode optical modules are twice as high as multi-mode optical modules, so the total cost of single-mode optical modules is higher than that of multi-mode optical modules, and the transmission distance of single-mode optical modules can reach 150 to 200 kilometers.

Therefore, long-distance transmission can be solved with optical fiber, similar to remote monitoring projects.

HDMI cable

HDMI high-definition multimedia interface, ordinary hdmi HDMI interface, can be connected with HDMI display and display, and now many network boxes can also connect to the TV through wiring, transmit audio and video signals.

The distance of ordinary HDMI signal transmission is less than 30 meters, then the distance of ordinary wire transmission is about 15 meters.

So how does HDMI transmit?

1. Conversion extender available.

HDMI signal is not through other devices (transmission 120 meters),HDMI signal generally can not be directly transmitted to more than 30 meters through HDMI cable, almost no HDMI finished line on the market more than 30 meters.

In this example, if only the HDMI signal is simply transmitted to the display device, and the HDMI signal is not passed through other devices, on this basis, you can use the way of cable extension, through the HDMI cable extension, HDMI cable extender is divided into the sending end (HDMI input, cable output) and the receiving end (cable input, HDMI output). It can be expanded by 100 meters (Type 5 network cable).120 meters (Type 6 network cable).

2. Of course, if long-distance transmission is required, HDMI fiber spreader can also be used.

There are many ways to expand HDMI, you can also use HDMI fiber optic cable, can be used according to the actual situation.

DVI cable

DVI is a digital video interface, the general DVI line can only effectively transmit about 5 meters of the signal, more than 5 meters will appear signal attenuation. This seriously restricts the popularity and application of DVI equipment.

DVI-D can only receive digital signals, DVI-I can receive digital and analog signals at the same time, and the transmission distance is short, up to 7-15M.

VGA cable

VGA cable transmits analog signals, which is a data transmission line that connects the computer graphics card to the monitor or TV, and then transmits information in this way. As a bridge between the computer and the monitor, it is responsible for the output of the image signal to the monitor. It is widely used in the field of color display, but it is easy to decay, short transmission distance, easy to be interfered. However, its transmission distance is a little stronger than HDMI and DVI, and the transmission distance of 3+4/6VGA is 20-40M.

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