Configurable SerDes for Fast Locking in PON and Point-to-Point Links
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Solution Overview
Problem
Conventional serializer/de-serializer (SerDes) designs face design constraints in point-to-multipoint systems due to stricter timing requirements for locking onto varying frequency and phase of incoming data streams from multiple optical network units, leading to increased complexity and cost inefficiencies in manufacturing.
Innovation Solution
A dual-purpose SerDes design that can operate in both point-to-point and point-to-multipoint modes, utilizing configuration registers and management interfaces to adjust operational characteristics such as lock timing and power consumption, allowing a single design to be configured for different modes of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional SerDes designs are used for point-to-multipoint systems, then the system can support multiple optical network units, but the locking time requirement becomes stricter and design complexity increases
Solution Approach 1:
The SerDes is designed with a unified architecture that can operate in both point-to-point and point-to-multipoint modes through configuration registers and management interfaces. The same basic SerDes structure handles different operational modes by adjusting operational characteristics such as lock timing and power consumption, eliminating the need for separate designs for each mode.
Solution Approach 2:
The SerDes incorporates dynamic configuration capabilities through configuration registers that allow operational characteristics to be adjusted based on the communication mode. The system can dynamically change lock timing requirements and power consumption levels to match whether it is operating in point-to-point or point-to-multipoint mode, providing adaptability without increasing fundamental design complexity.
2Adaptability or versatility
If conventional SerDes designs are used for point-to-multipoint systems, then the system can handle multiple incoming data streams, but manufacturing cost increases due to design complexity
Solution Approach 1:
By creating a universal SerDes design that can function in both point-to-point and point-to-multipoint modes, the patent enables a single design to be manufactured for multiple applications. This eliminates the need to produce separate SerDes variants for different communication modes, thereby reducing manufacturing complexity and cost while maintaining full operational flexibility.
3Reliability
If the SerDes locks to incoming embedded clock in point-to-multipoint mode, then data transfer reliability is maintained, but locking time must be minimized under stricter timing requirements
Solution Approach 1:
The patent adjusts the lock timing parameter based on the operational mode. In point-to-point mode, the SerDes can use relaxed lock timing requirements since it only needs to lock once. In point-to-multipoint mode, the configuration registers enable the SerDes to optimize lock timing for faster acquisition while maintaining reliability through the same fundamental clock locking mechanism to the embedded clock in incoming data streams.
Data Source
AI summary
A dual purpose serializer/de-serializer (SerDes) for point-to-point and point-to-multipoint communication. A configurable SerDes can be designed to operate in one of a plurality of operating modes. Selection between the plurality of operating modes can be based on information received via a management interface. In one example, the various operating modes can be defined with different locking times and jitter characteristics.