Ethernet Multi-Lane Gearbox Virtual Lane Markers
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Solution Overview
Problem
Current networking technologies face challenges in efficiently managing increasing bandwidth demands, particularly in supporting multiple 10 GbE data streams over faster 40 Gbit/s links, as existing solutions struggle to fan out lower data rate streams effectively and maintain correspondence between virtual and physical lanes.
Innovation Solution
A 40 GbE multi-lane gearbox device that inserts virtual lane markers into 10 GbE data streams, enabling efficient conversion and transmission of these streams as higher-rate data flows over 40 Gbit/s pipes, using a 4:n physical media attachment module to generate multiple higher-rate data flows for transmission over optical or copper media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple asynchronous 10 GbE data streams are transmitted over a 40 Gbit/s link, then bandwidth utilization is improved, but lane correspondence and deterministic multiplexing cannot be maintained
Solution Approach 1:
The gearbox inserts virtual lane markers into data streams before transmission over the 40 Gbit/s link. These markers are placed at defined intervals in advance, enabling the receiving end to correctly identify and separate lanes without requiring synchronous operation, thus maintaining lane correspondence while achieving high bandwidth utilization
Solution Approach 2:
Virtual lane markers serve as intermediary elements that mediate between asynchronous 10 GbE input streams and the 40 Gbit/s transmission medium. These markers enable deterministic multiplexing by providing reference points that allow the system to track and maintain lane correspondence throughout the conversion process
2Device complexity
If four 10 GbE channels are aggregated into a single 40 Gbit/s stream, then device complexity is reduced, but the ability to maintain deterministic multiplexing is lost
Solution Approach 1:
By pre-inserting virtual lane markers at defined intervals into each of the four 10 GbE channels before aggregation, the system enables deterministic multiplexing to be maintained even when four channels are aggregated into a single 40 Gbit/s stream, avoiding the need for complex synchronous coordination hardware
Solution Approach 2:
The system changes the parameter of lane identification from relying on physical lane synchronization to using virtual lane markers with specific temporal spacing. This parameter change allows deterministic multiplexing to be achieved through marker-based identification rather than through complex physical interface coordination
Data Source
AI summary
A system and method for 10/40 gigabit Ethernet multi-lane gearbox. In one embodiment, a gearbox device includes one or more inputs on a line side of the device, the one or more inputs being configured to receive four asynchronous 10 Gbit/s Ethernet channels, a marking module that is configured to insert virtual lane markers into four data flows at defined intervals to produce four marked data flows, and a 4:n physical media attachment (PMA) module that is configured to generate one or more higher-rate data flows based on the four marked data flows.