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4.3 Network Topology
4.3.1 A submarine cable system should adopt two basic topologies:P-to-P topology（Figure 4.3.1-1）and branch topology（Figure 4.3.1-2）.
Figure 4.3.1-1 P-to-P topology
Figure 4.3.1-2 Branch topology
4.3.2 When selecting the topology，the landing stations'geographical relationship，service demands，network safety requirements and cost effectiveness shall be taken into consideration.