Multiplex Transmission System Bit Rate Adjustment for Wavelength Efficiency
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Solution Overview
Problem
Current optical transmission systems, such as SONET/SDH and OTN, face inefficiencies in accommodating and multiplexing client signals with different bit rates that are not integral multiples or submultiples of each other, particularly with 10 GbE-LAN-PHY signals, leading to reduced wavelength resource utilization and the need for multiple wavelengths, which complicates transparent signal transfer.
Innovation Solution
Implementing a bit rate adjustment mechanism that converts client signal bit rates to integral multiples or submultiples of each other, allowing for efficient multiplexing through time-division multiplexing and management overhead adjustment, enabling transparent transmission of signals like 1 GbE and 10 GbE within a single wavelength, while maintaining compatibility with OTN standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional SONET/SDH or OTN systems are used to transmit client signals with different bit rates that are not integral multiples of each other, then wavelength resource utilization becomes inefficient and multiple wavelengths are required, but this increases device complexity and reduces productivity
Solution Approach 1:
The patent applies parameter changes by adjusting the bit rate of client signals through rate adjustment mechanisms. Specifically, the system modifies the bit rate parameter of Ethernet signals (e.g., converting 10.3125 Gbit/s to match OTN container bit rates like 9.95328 Gbit/s or 11.08 Gbit/s) to enable efficient multiplexing. This allows diverse client signals with non-integral bit rates to be accommodated within a single wavelength, improving wavelength resource utilization efficiency while managing device complexity through standardized rate adjustment procedures
2Reliability
If multiple wavelengths are used to accommodate client signals with different bit rates, then transparent signal transfer is achieved, but the system complexity increases and operational efficiency decreases
Solution Approach 1:
The patent implements dynamics by enabling flexible bit rate adjustment of client signals according to the capacity of OTN containers. The system dynamically adapts the bit rate of incoming Ethernet signals to match available container capacities, allowing a single wavelength to accommodate multiple diverse client signals. This dynamic rate adjustment maintains transparent signal transfer capability while simplifying network operation, as operators no longer need to manually configure multiple wavelengths for different bit rate scenarios
3Stability of the object's composition
If bit rates of client signals are not adjusted to integral multiples, then original signal characteristics are preserved, but multiplexing efficiency is reduced and wavelength resources are wasted
Solution Approach 1:
The patent applies preliminary action by performing rate adjustment of client signals before they are mapped into OTN containers. The system pre-adjusts the bit rate of Ethernet signals to match the container capacity (e.g., adjusting 10.3125 Gbit/s signals to 9.95328 Gbit/s or 11.08 Gbit/s) prior to multiplexing. This preliminary rate adjustment ensures that multiple client signals can be efficiently multiplexed within a single wavelength while maintaining signal integrity, thereby improving multiplexing efficiency without compromising signal characteristics
Data Source
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AI summary
A multiplexing transmission system for adding a management overhead to a client signal, and transparently accommodating or multiplexing the client signal to transmit it is provided. The multiplexing transmission system: accommodates a plurality of client signals of different bit rates including a client signal of a bit rate that is not an integral multiple or an integral submultiple of a bit rate of other client signal, and performs rate adjustment for a part or the whole of the plurality of client signals such that the bit rate of each client signal becomes an integral multiple or integral submultiple of the bit rate of other client signal.