PON Baud Rate Segmentation for ONU Compatibility
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Solution Overview
Problem
Current PON technologies face challenges in improving the transmission rate of the entire line while considering deployed ONUs, as increasing the baud rate of signals sent by the OLT can lead to high bit error rates in older ONUs due to clock recovery issues.
Innovation Solution
The proposed solution involves a passive optical network communication method that identifies the type of optical network unit based on an identifier and determines the corresponding channel for encapsulating Ethernet packets, allowing for improved baud rates without affecting deployed ONUs, by using a GPON encapsulation method and synchronously modulating redundant code streams when channels are idle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the baud rate of the signal sent by the OLT is improved to increase the transmission rate, then the transmission rate of the entire line is improved, but the deployed ONU cannot correctly receive the signal due to clock recovery issues, resulting in high bit error rate
Solution Approach 1:
The patent segments the transmission system into two distinct channels: a first channel operating at the original baud rate for deployed ONUs, and a second channel operating at the improved baud rate for new ONUs. This segmentation allows each channel to independently serve its target ONU type without interference, resolving the contradiction between improving transmission rate and maintaining compatibility with existing ONUs.
Solution Approach 2:
The patent applies local quality by assigning different transmission characteristics to different channels. The first channel maintains the original signal properties suitable for deployed ONUs, while the second channel uses improved signal properties for new ONUs. This allows the system to optimize performance locally for each ONU type without compromising overall system compatibility.
2Speed
If the baud rate is increased to 20 GBaud to achieve 20 Gbps downlink rate, then the downlink line rate is improved, but the clock in the clock recovery circuit of the deployed ONU cannot be locked, causing the ONU to fail to correctly recover 1 and 0 in the signal
Solution Approach 1:
The patent divides the downlink transmission into two separate channels with different baud rates. The first channel operates at the original baud rate ensuring clock recovery compatibility for deployed ONUs, while the second channel operates at the higher baud rate for new ONUs with improved clock recovery capabilities. This segmentation resolves the contradiction between increasing baud rate and maintaining clock recovery ease of operation.
Solution Approach 2:
The patent introduces an intermediary mechanism in the OLT that identifies ONU types and directs traffic to appropriate channels. This intermediary function allows the system to maintain ease of operation for deployed ONUs by routing them to the first channel with original baud rate, while enabling baud rate improvement for new ONUs through the second channel.
Data Source
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AI summary
Embodiments of this application provide a passive optical network communication method, an apparatus, and a system. The method includes: receiving an Ethernet packet, where the Ethernet packet carries an optical network unit identifier; looking up a correspondence between the optical network unit identifier and an optical network unit type based on the optical network unit identifier, to determine that an optical network unit that receives the Ethernet packet is a first type of optical network unit, where the optical network unit type includes the first type of optical network unit and a second type of optical network unit, and a packet receiving rate of the first type of optical network unit is different from a packet receiving rate of the second type of optical network unit; looking up a correspondence between the optical network unit type and a channel based on the first type of optical network unit, to determine a channel corresponding to the first type of optical network unit; and encapsulating the Ethernet packet into a GPON encapsulation method GEM frame and sending the GEM frame to the first type of optical network unit by using the determined channel. In the embodiments of this application, by improving a baud rate of a signal sent by an OLT, a transmission rate of an entire line is improved and a deployed ONU is also considered.