Comparison and difference between X.25 and Frame-Relay protocols
Due to the characteristics of early wide area network links: the unreliability of the link and the high bit error rate, the X.25 protocol is designed to be a rigorous, connection-oriented protocol, which corrects errors piece by piece during the entire transmission process Compared with flow control, the maximum frame length is 256 bytes, which is inefficient for the IP protocol.
In the later period, due to the greatly improved WAN link quality and the wide application of optical fiber, the Frame Relay protocol simplifies the third layer function of X.25, adopting the two-layer structure of the physical layer and the link layer, and only the link layer The core subset is simplified, the X.25 complex error correction and retransmission mechanism is simplified, the link layer is efficiently encapsulated, the maximum frame transmission length is increased to 1600 bits, which is suitable for the transmission of IP packets and improves the network. The efficiency of processing information.
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