Frame-Relay description
Physical topology: switches, access links, trunks, CSU / DSU
Frame relay technology is a fast packet switching technology that uses simplified methods to transmit and exchange data units at the data link layer. Frame relay technology was born and developed under the conditions that packet switching technology is fully developed, digital and optical fiber transmission lines are gradually replacing existing analog lines, and user terminals are becoming more intelligent.
Frame relay only completes the functions of the physical layer of the OSI and the core layer of the link layer, leaving flow control and error correction to the intelligent terminal, which greatly simplifies the protocol between the node machines; at the same time, frame relay uses virtual circuit technology, Can make full use of network resources, so frame relay has the characteristics of high throughput, low delay, suitable for sudden business and so on. Frame relay is an important option for ATM networks. Frame relay is introduced into ISDN as a bearer service added to the packet mode. Its frame structure is consistent with the LAPD structure of ISDN and can be logically multiplexed.
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