This section describes how to configure the 52TOM board in a ring network.
Refer to Figure 1, the optical NEs (ONEs) A, B, C and D form a ring network, and all the ONEs function as OADM stations.
User1 and User2 communicate with each other. One bidirectional OTU1 service is available between station A and station B. At station A, the TOM board accesses six Any services (100 Mbit/s to 2.5 Gbit/s) and then converts them into one OTU1 service. On the WDM side, the TOM board performs dual transmitting and selective receiving.

In this example, a TOM board should be configured on both station A and station B.