Envelope Header Design for 100 Gb/s PON Data Coordination
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Solution Overview
Problem
Existing 100 Gb/s passive optical networks (PONs) face challenges in coordinating data transmission across multiple channels due to the lack of coordination information in data frames, making it difficult to reassemble multiple received data streams into a single stream effectively.
Innovation Solution
The implementation of envelope headers that include control bytes, logic link identifiers, encryption flags, envelope position alignment markers, and cyclic redundancy checks facilitates the coordination and reassembly of data streams by replacing the preamble of Ethernet packets with these headers, enabling efficient transmission and encryption across multiple wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If data frames are transmitted without coordination information across multiple channels, then transmission simplicity is maintained, but the ability to reassemble data streams effectively deteriorates
Solution Approach 1:
The data transmission is segmented into multiple channels (wavelengths), with coordination information distributed across envelope headers in each channel. This allows each channel to operate independently while maintaining overall coordination through the segmented header information.
Solution Approach 2:
Envelope headers act as intermediary elements that carry coordination information between the transmission medium and the data payload. These headers enable reassembly by providing positioning and alignment data without interfering with the actual data content.
2Reliability
If envelope headers with coordination information are added to data frames, then reassembly capability is improved, but device complexity increases
Solution Approach 1:
The envelope header structure serves multiple functions simultaneously: it provides coordination information for reassembly, carries encryption flags for security, includes alignment markers for positioning, and offers error detection through CRC. This multi-functionality reduces the need for separate mechanisms for each purpose.
Solution Approach 2:
The header structure uses configurable parameters such as alignment marker values and flag settings to adapt to different transmission scenarios. This allows the same basic structure to handle various reassembly requirements without increasing fundamental complexity.
3Productivity
If multiple wavelength channels are used for parallel transmission, then transmission speed is improved, but coordination and reassembly difficulty increases
Solution Approach 1:
The patent adds a temporal dimension to the coordination problem by using alignment markers that indicate position within the envelope structure. This allows receivers to correlate data from multiple channels by their temporal positioning rather than requiring complex spatial coordination.
Solution Approach 2:
The envelope headers include feedback information in the form of alignment markers and position indicators that enable receivers to adjust their reassembly process based on the actual received data positioning, facilitating coordinated reassembly across multiple channels.
Data Source
AI summary
A computer-implemented method of handling Ethernet packets in a passive optical network (PON) is disclosed. The method comprises generating, by the one or more processors, an initial envelope header that indicates that the initial envelope header is not a preamble replacement; transmitting, over the PON, by the one or more processors, the initial envelope header; accessing, by the one or more processors, an eight-byte block from a first Ethernet packet of a plurality of Ethernet packets; in response to the eight-byte block being an Ethernet preamble, generating, by the one or more processors, a first envelope header that indicates that the envelope header is a preamble replacement; and transmitting, over the PON, by the one or more processors, the first envelope header.