Tangent rings are taken as an example to illustrate the configuration of grooming at the optical layer.
Project R adopts a tangent ring networking that comprises seven ONEs: A, B, C, D, E, F and G. All of the ONEs are OADM stations. Figure 1 shows the networking diagram of Project R.
In project R, the uni-directional services are allocated as shown in Figure 2. There are two services between station B and station C. Between station A and station B, station B and station D, station C and station D, station D and station E, station D and station G there is one service respectively. All of the services are STM-64 services.
