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Tham khảo tài liệu 'cell site backhaul aggregation transport with next generation sonet systems', công nghệ thông tin, phần cứng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Cell Site Backhaul Aggregation Transport with Next Generation SONET Systems Overview One of the greatest challenges facing mobile operators today is reducing the cost of the backhaul portion of their network while increasing reliability and revenue generating opportunities. Additionally mobile operators need to be sure that the backhaul transport solution is capable of addressing the traditional 1 and 2G-based Radio Access Networks RANs as well as the 3G-based RANs. The number of 3G-based RANs will grow driven by new services with higher bandwidth that enable end-users to get broadband access through their mobile devices. APPLICATION NOTE Traditionally the backhaul portion of the mobile wireless network has consisted largely of multiple leased T1 lines or privately owned microwave connections that backhaul traffic from base-station transceiver subsystems BTS to mobile switching centers MSCs . These solutions are expensive and not easily scalable. Therefore with SONET and DS3 connections becoming more affordable mobile operators have begun implementing either on their own or through a local exchange carrier LEC a complete backhaul solution including traffic grooming and multiplexing. Previously much of the traffic grooming and multiplexing has been handled at a DS0 to DS1 level. For cellular voice traffic this has been acceptable however as 3G rollouts begin the bandwidth required by new applications will require traffic grooming and multiplexing at DS1 rates and above as well as IP Ethernet connectivity. Wireless carriers estimate that the roll out of data services will require increasing backhaul capacity 25 percent. With the existing and new traffic requirements at a given cell site multiple point-to-point T1 connections would be required for transporting existing services and a Gigabit Ethernet or optical 100BaseT or DS-3 connection would be required to transport data from each 2.5G 3G site. Consolidating this traffic onto a common optical transport backbone can
