Optical Network Design and Implementation

SDH Topologies

SDH topologies center around survivability of the network with 50 ms or lower rapid recovery. Various topologies can be configured using either SDH ADMs or DCSs. It is interesting to note that SONET ring topologies are often used in North America, whereas Europe, Asia, and Latin America mainly rely on SDH-based ring as well as meshed network topologies. Protection switching is mainly performed by the intelligent ADMs or DCSs.

SDH Point-to-Point Topology

Point-to-point topologies are created by connecting two SDH PTEs back to back over dark fiber. As depicted in Figure 6-17, a point-to-point deployment involves two PTE ADMs or TMs linked by fiber with or without an STE regenerator in the link. The TM can act as an E1 concentrator ...