G.709 Gateway Element Multi-Stage Multiplexing Routing Control
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Solution Overview
Problem
The integration of ODU0 and ODUflex signals into existing OTN networks poses challenges due to differences in branch timing sequences, requiring network upgrades that can disrupt invested infrastructure and complicate interconnections between 1.25G and 2.5G timing sequence networks.
Innovation Solution
Implementing a G.709 based multi-stage multiplexing routing control method through gateway network elements that map ODU0/ODUflex to ODU1 or ODU2 and then to ODU3, using Open Shortest Path First Interior Gateway Protocol-Traffic Engineering (OSPF-TE) or Intermediate System-to-Intermediate System-Traffic Engineering (IS-IS-TE) to advertise and support multi-stage ODU multiplexing capabilities, thereby avoiding the need for network-wide upgrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ODU0 and ODUflex signals are integrated into existing OTN networks, then new services and applications are enabled, but network complexity increases and interconnection difficulties arise due to branch timing sequence differences
Solution Approach 1:
The patent introduces a timing sequence conversion device as an intermediary component between 1.25G branch timing sequence networks and 2.5G branch timing sequence networks. This device converts timing sequences and multiplexes signals, enabling seamless interconnection without requiring changes to existing network infrastructure. The intermediary handles the complexity of timing sequence differences, allowing new ODU0 and ODUflex services to be integrated while maintaining compatibility with legacy networks.
2Reliability
If network-wide upgrades are implemented to support ODU0 and ODUflex, then seamless integration is achieved, but existing infrastructure investments are disrupted and costs increase
Solution Approach 1:
The patent applies local quality by implementing timing sequence conversion only at specific intermediary nodes rather than upgrading the entire network. The conversion device is deployed locally at strategic points where 1.25G and 2.5G networks intersect, converting timing sequences only where necessary. This localized approach maintains existing infrastructure investments while enabling ODU0 and ODUflex integration, avoiding the need for network-wide upgrades.
Solution Approach 2:
The patent performs preliminary action by pre-configuring the timing sequence conversion device with the necessary conversion capabilities before integration. The device is prepared in advance to handle both 1.25G and 2.5G branch timing sequences, allowing seamless integration to be achieved without disrupting existing operations. The conversion functionality is established beforehand, enabling smooth deployment of new services.
3Device complexity
If traditional single-stage multiplexing is used, then device simplicity is maintained, but the ability to support multiple rate levels and services is limited
Solution Approach 1:
The patent applies segmentation by dividing the multiplexing process into distinct stages. The timing sequence conversion device performs initial multiplexing of low-order ODUs (including ODU0 and ODUflex) into intermediate containers, which are then further multiplexed into high-order ODUs by subsequent network elements. This segmented approach allows each device to maintain relative simplicity while the overall system achieves comprehensive service support capability across multiple rate levels.
Data Source
AI summary
A G.709 based multi-stage multiplexing routing control method is provided in the present invention, which includes that: the multi-stage multiplexing capability of the gateway network element is carried in a link state advertisement data packet, and the multi-stage multiplexing capability of the gateway network element is advertised to a routing domain in which the gateway network element is located or a path computation entity through a routing protocol. A gateway network element is also provided in the present invention, the gateway network element is configured to: carry the multi-stage multiplexing capability of the gateway network element in the link state advertisement data packet, and advertise the multi-stage multiplexing capability of the gateway network element to the routing domain in which the gateway network element is located or the path computation entity through the routing protocol. With the above G.709 based multi-stage multiplexing routing control method and gateway network element, advertising the multi-stage multiplexing capability of the gateway network element to other network elements is implemented, thereby solving the problem of interconnection between new devices and old devices.