- Oct 09, 2017 -
The repeater is the simplest and cheapest interconnection device used to extend the network distance in the LAN environment. The operation is in the physical layer of the OSI, and the repeater has the function of enlarging and regenerating the signal on the line. Used to extend the length of the LAN segment. Only used to connect the same LAN segment; its role is to amplify the signal, compensation signal attenuation, support long-distance communication.
Advantages of repeaters:
1) Filter traffic The repeater receives packets from a subnet, and the repeater is forwarded only when the packet is sent to another subnet to which the repeater is connected, otherwise it is not forwarded.
2) to expand the communication distance, but the cost is to increase the number of storage forwarding delay.
3) increases the maximum number of nodes.
4) Each network segment can use different communication rates.
5) to improve the reliability: When the network fails, generally only affect the individual network segment.
6) performance improved.
Repeater Disadvantages Analysis:
1) As the repeater to the received frame to store and then forward, increase the delay.
2) CAN bus MAC sub-layer and no flow control function. When the load on the network is very heavy, it may be due to the buffer in the repeater storage space is not enough to overflow, resulting in the phenomenon of frame loss.
3) If the relay fails, the work of two adjacent subnets will have an impact.