An important use of MAN is as a backbone network, which connects hosts, databases and local area networks located in different parts of the same city, similar to the role of WAN, but with great differences in implementation and performance.
Based on large LAN, LAN-like technology is usually used. MAN is listed separately, because there is already a standard: Distributed Queue Dual Bus (DQDB), which is IEEE802.6. DQDB consists of two buses to which all computers are connected.
Extended data:
MAN is divided into three layers: core layer, convergence layer layer and access layer;
1. The core layer mainly provides high-bandwidth service bearer and transmission, and completes the interconnection with existing networks (such as ATM, FR, DDN and IP networks), featuring broadband transmission and high-speed scheduling.
2. The main function of convergence layer is to provide service access nodes with the aggregation and distribution of user service data, and at the same time realize the service level classification of services.
3. The access layer adopts various access technologies to allocate bandwidth and services to realize user access, and the access node equipment completes the multiplexing and transmission of various services.
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