SDH DCC Byte Transmission via Pseudo Wire Segmentation
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Solution Overview
Problem
In the process of replacing an SDH network with a PTN network, intermediate nodes in the PTN network face increased burden as they need to identify whether management packets carry SDH service information or DCC bytes, complicating transparent transmission of DCC bytes.
Innovation Solution
Establishing a pseudo wire between local and peer end nodes to separate and package DCC bytes into dedicated overhead packets, which are transmitted as service packets alongside payload packets, allowing transparent transmission without intermediate node intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCC bytes are placed into the management packet of the pseudo wire using existing methods, then transparent transmission of DCC bytes is achieved, but the intermediate node burden increases due to the need to identify packet types
Solution Approach 1:
The patent segments the transmission by separating DCC bytes from regular payload packets and placing them into dedicated overhead packets with distinct packet types (e.g., type 0x00 for overhead, type 0x01 for payload). This segmentation allows intermediate nodes to forward packets based on simple packet type identification without needing to interpret or differentiate complex management information, thus maintaining transparent transmission while reducing processing complexity.
Solution Approach 2:
The patent introduces a dedicated overhead packet structure as an intermediary carrier for DCC bytes. This intermediary packet type acts as a mediator between the SDH management plane and the PTN transport network, encapsulating DCC bytes in a standardized format that intermediate nodes can handle uniformly without needing to understand SDH-specific management semantics, thereby reducing node burden while ensuring reliable transmission.
2Ease of operation
If intermediate nodes identify and process different packet types (management information vs. service information), then proper routing is achieved, but processing time and complexity increase
Solution Approach 1:
The patent segments packets into clearly defined types (overhead packets with type 0x00, payload packets with type 0x01) with distinct identification markers. Intermediate nodes only need to recognize these simple type identifiers to perform accurate routing, eliminating the need for complex packet content analysis and significantly reducing processing time while maintaining routing accuracy.
Solution Approach 2:
The patent changes the packet identification parameter from complex content-based identification to simple type-based identification. By assigning fixed type values to different packet categories (overhead vs. payload), the system enables intermediate nodes to make rapid routing decisions based on packet type parameters rather than analyzing packet contents, thus reducing processing time while ensuring correct routing.
Data Source
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AI summary
The present invention relates to the field of communications technologies and discloses a method, an apparatus and a system for transmitting SDH/Sonet section overhead bytes, which reduce a burden of an intermediate node of a PTN network in a process of transmitting DCC bytes in the PTN network. In the present invention, a pseudo wire is established between a local end node and a peer end node. The local end node separates target overhead bytes from section overhead bytes of an SDH/Sonet frame, where the target overhead bytes include DCC bytes; packages the target overhead bytes to obtain a dedicated overhead packet; and sends the dedicated overhead packet to the peer end node, where the dedicated overhead packet is transmitted as a service packet of the pseudo wire. The embodiments of the present invention are mainly applied to a process of transmitting an SDH/Sonet service in the PTN network.