This section describes how to configure 52TOM board for a ring network.
See Figure 1. The optical NEs (ONEs) A, B, C and D form a ring network, and all the ONEs function as OADM stations.
User1, User2, and User3 communication with each other through one OTU2 service separately. On station A, the 52TOM board accesses four OTU1 services and then converts them into eight ODU0 services. The eight ODU0 services are then sent to two 52NS2 boards according to the actual services requirement. Each 52NS2 board converges the received ODU0 services and other accessed services into one OTU2 service.

In this example, a 52TOM board and two 52NS2 boards should be configured on station A, a 52TOM board and an 52NS2 board should be configured on station B and station D.