(With the development of INTERNET, the integration of voice, data and other networks based on IP backbone network has become a trend. The domestic telecom IP infrastructure network platform is developing rapidly, and all provinces have built IP backbone network and broadband metropolitan area network. Broadband metropolitan area network is usually divided into three layers (below), namely core layer, aggregation layer and access layer. The core layer is mainly responsible for IP service tandem, connecting to the provincial telecom broadband IP network; the convergence layer provides functions including dedicated line access, 100M/1000M access, and IP routing addressing; the access layer is a layer directly facing users , it provides users with a means of broadband access to the metropolitan area network, which is commonly referred to as "last mile" access. Its scope of use is mainly in broadband smart communities (buildings). , HomePNA and wireless access and other means. At present, the core layer and aggregation layer of many metropolitan area networks have been basically completed, and how to achieve faster, stable and secure broadband access at a lower cost has attracted much attention.
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Lenovo Network Broadband Access Solution.pdf....)
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