This section provides the definition of DCC bytes transparent transmission and describes its purpose.
Definition
DCC bytes transparent transmission is a DCN solution provided by Huawei. In this solution, different manufacturers' network management messages are translated by using different DCC bytes. In this manner, network management messages pass through a network that is composed of the OptiX equipment and the third-party SDH equipment.
When DCC bytes are used to transparently transmit network management messages, there are two networking scenarios:
The OptiX equipment is at the edge of a network.
In this networking scenario, there are two possibilities:
The third-party equipment uses bytes D1 to D3 as DCCs.
In this case, the OptiX equipment uses bytes D4 to D12 as DCCs. In addition, you need to add a route to transparently transmit bytes D4 to D12 in the transmission network of the third-party equipment.
Figure 1 DCC bytes transparent transmission solution when the OptiX equipment is at the edge of a network (1)
The third-party equipment uses bytes D4 to D12 as DCCs.
In this case, the OptiX equipment still uses bytes D1 to D3 as DCCs. In addition, you need to add a route to transparently transmit bytes D1 to D3 in the transmission network of the third-party equipment.
Figure 2 DCC bytes transparent transmission solution when the OptiX equipment is at the edge of a network (2)
The OptiX equipment is in the center of a network.
In this networking scenario, there are two possibilities:
The third-party equipment uses bytes D1 to D3 as DCCs.
In this case, the OptiX equipment uses bytes D4 to D12 as DCCs. In addition, you need to add a route to transparently transmit bytes D1 to D3.
Figure 3 DCC bytes transparent transmission solution when the OptiX equipment is in the center of a network (1)
The third-party equipment uses bytes D4 to D12 as DCCs.
In this case, the OptiX equipment still uses bytes D1 to D3 as DCCs. In addition, you need to add a route to transparently transmit bytes D4 to D12.
Figure 4 DCC bytes transparent transmission solution when the OptiX equipment is in the center of a network (2)
Purpose
DCC bytes transparent transmission is preferred as the DCN solution when the network is comprised of the OptiX equipment and the third-party SDH equipment that does not support IP DCN.