ONU L2 Tunnel for Dynamic Logical Path Generation
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Solution Overview
Problem
Existing optical communication network systems struggle to generate logical paths between optical network units (ONUs) and optical line terminals (OLTs) when terminal devices are connected through network devices like routers, limiting the number of logical paths and bandwidth allocation.
Innovation Solution
The system incorporates an L2 tunnel function between the ONU and network devices, enabling the ONU to acquire ID information from terminal devices and generate logical paths using this information, allowing for flexible logical path generation and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MAC addresses are allocated in advance to generate logical paths, then logical path generation is possible, but the number of logical paths is limited to the number of pre-allocated MAC addresses
Solution Approach 1:
The system performs preliminary actions by pre-configuring the ONU with a single default MAC address and establishing the L2 tunnel framework in advance. However, the actual logical path generation is deferred until terminal devices connect, allowing dynamic adaptation without pre-allocating multiple MAC addresses.
Solution Approach 2:
The system transitions from static pre-allocated MAC addresses to dynamic logical path generation. The ONU dynamically creates logical paths based on terminal device MAC addresses acquired through ARP requests after connection, allowing the number of logical paths to adapt to actual usage needs.
2Adaptability or versatility
If terminal devices are connected directly to ONU, then ID information can be acquired easily, but network devices like routers cannot be accommodated
Solution Approach 1:
The L2 tunnel acts as an intermediary between the ONU and terminal devices connected through network devices. The tunnel encapsulates terminal device frames, allowing the ONU to acquire terminal device MAC addresses and generate logical paths even when network devices are present in the connection path.
Solution Approach 2:
The ONU is designed with multi-functionality to handle both directly connected terminal devices and those connected through network devices. The L2 tunnel function enables the ONU to universally process frames from various connection topologies while maintaining the ability to identify and generate logical paths for each terminal device.
3Productivity
If multiple logical paths are generated for single ONU, then bandwidth allocation and priority control improve, but MAC address allocation complexity increases
Solution Approach 1:
The system implements self-service by allowing terminal devices to automatically obtain logical paths through their MAC addresses. When terminal devices connect, the ONU automatically acquires their MAC addresses via ARP requests and generates corresponding logical paths without manual configuration, enabling dynamic bandwidth allocation and priority control.
Solution Approach 2:
The system changes the parameter used for logical path generation from pre-allocated MAC addresses to dynamically acquired terminal device MAC addresses. This parameter change enables the number of logical paths to vary based on the number of connected terminal devices, improving bandwidth allocation efficiency while reducing configuration complexity.
Data Source
AI summary
An object of the present disclosure is to enable an ONU to acquire ID information of terminal devices even when a network device is connected between the ONU and the terminal devices, and to thereby enable generation of a logical path between the ONU and the OLT. The present disclosure relates to an optical communication network system configured to connect terminal devices and a passive optical network (PON) system via a network device. The PON system includes an optical line terminal and an optical network unit connected using an optical transmission line. The optical network unit is configured to construct a tunnel to the network device, acquire ID information of the terminal devices connected to the network device from the terminal devices via the tunnel, and generates a logical path to the optical line terminal on the optical transmission line using the acquired ID information.