IP over DCN Introduction

Definition

IP over DCN is a DCN solution provided by Huawei. In this solution, network management messages are encapsulated in the TCP/IP protocol stack, and the NMS manages the NEs that transmit the IP packets on DCCs.

Figure 1 shows how network management messages are transmitted in the IP over DCN solution. Different vendors' network management messages encapsulated in the TCP/IP protocol stack can be transmitted over the following DCN channels:

• Data communications channels (DCCs) carried by SDH lines/SDH radio links/PDH radio links/Integrated IP radio links
• Ethernet paths over Integrated IP radio links or FE/GE ports
• NMS port or NE cascade port
• D1 to D3, D4 to D12, or D1 to D12 bytes in an SDH frame carried over channelized STM-1 ports
• Partial bandwidth on ML-PPP links over channelized STM-1 ports
• Partial bandwidth on ML-PPP links over Smart E1 ports
• DCCs carried or Partial bandwidth on ML-PPP links over multi-functional cascade port

Figure 1 Networking diagram of the IP over DCN solution

Purpose

• IP over DCN is applicable when a network is comprised of only OptiX equipment.
• IP over DCN is preferred as the DCN solution when a network is comprised of the OptiX equipment and the third-party equipment that supports IP over DCN.
• IP over DCN is applicable when the central equipment on a network needs to provide an IP-based path that transmits network management messages to the edge NEs.
• IP over DCN is applicable when OptiX equipment interconnects with ATN/CX equipment using the VRF DCN solution (also called automatically available DCN solution).
• IP over DCN is a must when the ML-PPP links over Smart E1 ports or channelized STM-1 ports are used for DCN communication.