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In the city, densely distributed base station carrier frequency regions and a few more big stations are generally in the bustling city and district in the heart of the construction of its fiber optic cable is relatively perfect base for such access, we recommend using the physical and urban focal point of the base station with access to the grid network construction based network architecture, through the organization of the logical ring network approach to the organization of the circuit scheduling circuitry of the base station to the base station controller needs together. Network organization shown in Figure 6. Scattered distribution in the base region, the distance between the base station is relatively far, the laptop battery organize physical transmission grid relative to waste resources, we recommend selecting part in such base station access aggregation point (the council, but also a base station ), through the ring network or line, Xingxingjiegou will access a range of base station access the focal point focal point of several base station access through the ring-type structure and the BSC is connected to the node where the backbone transmission. mainly from the ECC DCN optimization and optimization to consider. For some relatively remote isolated small number of base stations or base station carrier frequency, can be used directly or chain structure Xingxingjiegou access convergence layer node, and then through these nodes where the ring into the BSC where the transit node. although the individual level, the business had good protection, But the whole business there is a single node on a path over the ring risk. Currently, in addition to carrying MAN beyond traditional voice services, metro transport network should also be able to provide IP service transmission, and can focus on the actual needs of different users, to provide differentiated services. Dell Studio XPS 1340 batteries
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