Optical Transmission Device Reducing Channel Count via Packet Segmentation
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Solution Overview
Problem
In optical transport networks, the existing GFP-T technology for transparent transmission of client signals requires a number of communication channels equal to the theoretical communication channels, leading to increased costs and complexity when changing or migrating network structures.
Innovation Solution
A transmission device that separates packets from a time division multiplexing signal, assigns identifiers based on stored positions, and transmits packets with different identifiers through a common transmission path, reducing the number of required communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If GFP-T performs transparent transmission by bit sampling independently of packet or frame boundaries, then hardware cost is reduced and synchronization processing is simplified, but the number of communication channels must equal the number of tributary slots, increasing network migration complexity
Solution Approach 1:
The patent segments the TDM signal into multiple packets, each assigned a unique identifier corresponding to its original tributary slot position. This segmentation allows packets from different tributary slots to be transmitted through a common communication channel while maintaining the ability to identify and separate them at the receiving end, thus reducing the number of required communication channels while preserving network flexibility.
Solution Approach 2:
The patent introduces an identifier (VID - Virtual Channel Identifier) as an intermediary element that links packets to their original tributary slot positions. This identifier acts as a mediator that enables packets from different tributary slots to be multiplexed onto a common channel while maintaining traceability to their source, solving the contradiction between channel reduction and migration flexibility.
2Reliability
If 40 tributary slots are used for 40 1 GbE signals in TDM transmission, then each signal has dedicated bandwidth, but changing communication channels requires changing client signal channels, increasing migration cost
Solution Approach 1:
The patent implements dynamic packet routing where packets are assigned to communication channels based on their identifier rather than fixed tributary slot positions. This dynamic approach allows the network to flexibly allocate packets to available channels, enabling communication channel changes without requiring changes to client signal configurations, thus improving both reliability and adaptability.
Solution Approach 2:
The patent changes the routing parameter from fixed tributary slot position to dynamic identifier-based channel assignment. By using the identifier (VID) as the routing parameter instead of the original slot position, the system can dynamically change communication channels while maintaining signal integrity, allowing network migration without increasing client signal channel changes.
Data Source
AI summary
A transmission device includes: a signal receiving part configured to receive a time division multiplexing signal in which a plurality of packets are stored; a separating part configured to separate the plurality of packets from the time division multiplexing signal; an assigning part configured to assign an identifier corresponding to a stored position in the time division multiplexing signal to each of the plurality of packets; and a packet transmitting part configured to transmit at least two packets having different identifiers out of the plurality of packets through a common transmission path.