- Oct 09, 2017 -
A repeater is a device that connects a network line and is used for two-way forwarding of physical signals between two network nodes. Do you know the function of the repeater when using the repeater? Xiaobian below to tell you about what the function of the repeater?
In the field of long-distance communications, the repeater has the following meaning:
1. An analog device that enhances the input signal, regardless of the type of input signal (either analog or digital). The repeater is used to reinforce the signal on the cable and send the signal farther to extend the network length. When the electronic signal is transmitted over the cable, the signal strength decreases as the length of the transfer increases. So the repeater is required to reinforce the signal to increase the transmission distance of the data.
2. A module or device for frequency conversion and power enhancement, such as a relay satellite, which is divided into upstream and downstream frequencies, mainly for signal enhancement and frequency difference.
Repeater working principle
The repeater allows the network signal to be driven so that they are transmitted farther. Due to the influence of transmission line noise, the digital signal or analog signal carrying information can only transmit a limited distance. The function of the repeater is to regenerate and transmit the received signal, thus increasing the distance of signal transmission.
It connects two or more segments of the same network. For example, Ethernet often uses the repeater to expand the cable length of the bus. The length of the standard cable Ethernet is 185 meters long and can have up to 5 segments. Therefore, the maximum network cable length can be increased to 925 meters The In general, the network part of the repeater is the network segment, not the subnet.
The repeater can connect two LAN cables, re-timed and regenerate the digital signals on the cable, and then send them out, which is the first layer of the OSI model - the typical functionality of the physical layer. The role of the repeater is to increase the coverage area of the LAN.
For example, the Ethernet standard specifies that the maximum length of a single-segment signal transmission cable is 500 meters. However, after connecting the 4-segment cable with the repeater, the signal transmission cable in Ethernet can be up to 2000 meters. Some brands of repeaters can be connected to different physical media cable segments, such as fine coaxial cable and cable.
The repeater only sends data from any cable segment to another cable regardless of whether there is any data in the data or data that is not suitable for the segment.
Involving the transmission and reception of the very high frequency radio spectrum lines. This limitation is overcome by the "repeater", which picks up the weak signal and amplifies them later at different frequencies. Thus, using a repeater, a low-power user (such as a mobile station) with a user who can communicate directly to the user's contact will be the other.