Do You Know The Transmission Distance Of Common Cables

Network cable

The network cable is twisted pair, which has different transmission distances according to different specifications of network cables.

Category 5 and category 6 are 100 meters, and the normal oxygen free copper category 6 line can reach about 120 meters. If you want to increase the transmission distance, repeaters can be installed between two twisted pair wires, and four repeaters can be installed. If 4 repeaters are installed to connect 5 network segments, the transmission distance can reach 500m.

Optical fiber

Optical fiber is generally used for long-distance transmission.

Optical fiber is divided into multimode and single-mode. The distance of multimode transmission is longer than that of network cable, but shorter than that of single-mode. In 10Mbps and 100Mbps Ethernet, multimode fiber can support multi meter transmission distance; In 1Gbps gigabit network, multimode optical fiber can support 550m transmission distance; So multimode is less used now.

Compared with multimode fiber, single-mode fiber can support longer transmission distance. In 100Mbps Ethernet and 1g gigabit network, single-mode fiber can support more than 5000m transmission distance.

The devices used in the single-mode optical module are twice that of the multi-mode optical module, so the overall cost of the single-mode optical module is higher than that of the multi-mode optical module; The transmission distance of single-mode optical module can reach 150 to 200 km.

HDMI cable

HDMI high-definition multimedia interface is generally used on high-definition display. It can connect HDMI display and display. Now many network boxes can also connect TV through connecting cable to transmit audio and video signals.

If the general HDMI signal transmission is less than 30 meters, the transmission distance of wire with general quality is about 15 meters.

So how does HDMI transmit over long distances?

1. You can use the conversion extender

HDMI signal can not be directly transmitted to more than 30 meters with HDMI wire without other equipment, and there are almost no HDMI finished lines more than 30 meters in the market.

In this case, if only the HDMI signal is simply transmitted to the display device, and the HDMI signal does not pass through other devices, we can use the method of network cable extension signal and use the HDMI network cable extender to extend the signal. The HDMI network cable extender is divided into sending end (HDMI input, network cable output) and receiving end (network cable input, HDMI output), which can be extended by 100m (class 5 network cable) and 120m (Class 6 network cable).

2. If you need to transmit further, you can use HDMI fiber extender.

There are many ways to extend HDMI. HDMI optical fiber cable can also be used according to the actual situation.

DVI cable

DVI is a digital video interface. The general DVI line can only effectively transmit the signal for about 5 meters. If it exceeds 5 meters, the signal will be attenuated. This disadvantage greatly limits the popularity and application of DVI devices.

DVI-D can only receive digital signals; DVI-I can receive digital signals and analog signals at the same time, with a short transmission distance of 7-15m.

VGA cable

VGA line transmits analog signal. It is a data transmission line that connects computer graphics card with monitor or TV and transmits information. It is responsible for outputting the corresponding image signal to the display. It is the bridge between the computer and the display.

VGA cable has been widely used in the field of color display, but it is easy to attenuate, short transmission distance and easy to be disturbed. However, its transmission distance is stronger than HDMI and DVI, and its transmission distance of 3 + 4 / 6vga is 20-40m.

RS232 and RS4

1、RS232：

The transmission distance of RS232 is limited. The standard value of transmission distance is 15m, and it can only communicate point-to-point. The transmission rate is 20KB / s.

2. RS4 multi:

RS4 multi wireless transmission distance is 1219 meters. The transmission rate is 10Mbps, and the communication distance can be reached only at the transmission rate of 100kb / s.

The special cable with impedance matching and low attenuation can reach 1800 meters, more than 1200 meters, and repeaters can be added (up to 8), so that the transmission distance is close to 10km