Example Description

Figure 1 Networking example for the OSI over DCC solution

Figure 1 shows a transmission network that is comprised of both OptiX equipment and the third-party equipment that supports the OSI over DCC feature. The steps to plan the DCN are as follows:

1. Plan network areas according to the situation of the network.

   Considering the number of the NEs, divide the entire DCN into three areas to make the number of the NEs in each area smaller than 32. In addition, set the four NEs on the central ring as L2 NEs to ensure that each area has an L2 NE and the L2 NEs are consecutive.

   Figure 2 Allocation of NE areas
   
   

2. Select the gateway NE.

   Select NE101, NE201, and NE301 as the gateway NEs to manage the OptiX NEs in their own areas.

3. Select the router that supports the OSI protocol stack to form the external DCN.

4. Plan DCCs.

   • As the third-party equipment uses the DCC bytes D1 to D3, it is not required to modify the DCCs of the NEs.
   • Set the LAPD role of each DCC to Network at the end nearer to the Web LCT and to User at the other end of the DCC.