Latency Difference Measurement Using Switched Round-Trip Signals
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Solution Overview
Problem
Existing methods for measuring latency differences in optical communication networks require multiple nodes and human coordination, especially over long distances, and involve doubling the equipment needed for bidirectional measurements.
Innovation Solution
A system that allows for latency difference measurement at a single test site using a switch to facilitate round-trip measurements on both transmitter and receiver-side paths, eliminating the need for a terminating node and reducing equipment requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a terminating node is used for latency measurement, then measurement accuracy is improved, but device complexity and cost increase due to requiring equipment at both ends of the link
Solution Approach 1:
The patent introduces a network manager as an intermediary that performs latency measurements remotely without requiring direct access to the terminating node. The network manager sends test signals through the link and receives responses, enabling accurate latency measurement while eliminating the need for equipment at both ends of the link.
Solution Approach 2:
The patent uses signal copying and reflection techniques where the network manager creates test signals, sends them through the link, and captures the returned signals. By analyzing the round-trip time and signal characteristics, the system replicates the measurement functionality without requiring physical presence at the distant terminating node.
2Measurement precision
If bidirectional measurements are performed, then comprehensive latency data is obtained, but equipment requirements double
Solution Approach 1:
The network manager is designed as a universal measurement device that can perform multiple measurement functions (unidirectional and bidirectional latency testing, skew measurement) using the same hardware and software platform. This multi-functionality eliminates the need for separate equipment sets for different measurement directions.
Solution Approach 2:
The system uses feedback mechanisms where the network manager sends test signals, receives responses from the distant node, and analyzes the round-trip characteristics. By measuring the time difference between outgoing and returning signals, the system derives both forward and reverse latency information from a single measurement process.
3Adaptability or versatility
If manual coordination between distant nodes is required, then measurement setup flexibility is improved, but productivity and automation decrease
Solution Approach 1:
The network manager performs self-contained latency measurements by automatically generating test signals, transmitting them through the link, receiving responses, and analyzing the results without requiring manual coordination with distant nodes. The system autonomously completes the entire measurement process, including signal generation, transmission, reception, and data analysis.
Solution Approach 2:
The network manager pre-configures measurement parameters, test signal characteristics, and analysis criteria before initiating measurements. By preparing all necessary settings and protocols in advance, the system enables automated execution of latency measurements without requiring real-time manual intervention or coordination between distant locations.
Data Source
AI summary
The present invention provides a system, apparatus, and method for determining latency differences in channels within a link at a single test site. In particular, the method allows for a single transmitting device to determine distinct latency differences on both transmitter and receiver-side paths without requiring a terminating node on the other side of the connection. In other words, a switch is used, in lieu of such a terminating node, at the other side of the paths that switches at least one channel's content onto another channel and sends it back for a round trip on various transmitter-and-receiver-side-paths combinations. The present invention is based on round trip measurements and switching capability of the receiving node.