Network Data Path Loopback Testing for Fiber Connectivity
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Solution Overview
Problem
Existing methods for testing network connectivity between geographically separated devices are impractical due to the physical length of the network, making manual inspection impossible, and require a cost-effective and efficient solution to diagnose communication failures without manual intervention.
Innovation Solution
A method utilizing a switchable loopback mechanism and flow controllable buffers to inject deterministic data into a network path, loop it back, and analyze for errors, allowing for a line rate test of downstream traffic paths without manual inspection, using dedicated cards to maintain the loop and verify transmission errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection of network connection is performed, then connection quality can be directly verified, but it becomes impossible when devices are geographically separated by long distances
Solution Approach 1:
The network connection performs self-diagnosis by automatically injecting test data through the data path and comparing transmitted data with received data to identify transmission errors, eliminating the need for manual inspection by technicians
Solution Approach 2:
The patent replaces manual physical inspection with an automated electronic testing system that uses data injection, loopback mechanisms, and error detection algorithms to verify connection quality across long distances
2Ease of operation
If automated testing is implemented to enable long-distance network testing, then manual inspection limitations are overcome, but system complexity increases due to additional testing components
Solution Approach 1:
The testing system is integrated into existing network devices, allowing them to perform both normal data transmission and automated testing functions, reducing the need for separate dedicated testing equipment
Solution Approach 2:
A loopback mechanism serves as an intermediary component that redirects transmitted data back to the source for comparison, enabling automated testing without requiring complex direct measurement systems between geographically separated devices
3Reliability
If continuous monitoring is performed to detect transmission errors in real-time, then connection quality is continuously verified, but network bandwidth is consumed by test data
Solution Approach 1:
Automated testing is performed periodically rather than continuously, with test data injected at scheduled intervals to balance connection verification needs with available network bandwidth for normal traffic
Solution Approach 2:
The system injects a controlled amount of test data that is sufficient to detect transmission errors but limited in volume to minimize impact on network bandwidth availability for productive traffic
Data Source
AI summary
A method and apparatus for testing a data path in a network is described. The method may comprise creating a closed loop in the data path so that test data (e.g., fixed set of known data) sent from a local network device to a downstream network device is returned by the downstream network device. Thereafter, the test data is injected into the closed loop and selectively extracted from the loop. The test data may then be processed. The method may create the closed loop by closing a first loopback mechanism at the local network device and closing a second loopback mechanism at the downstream network device. In an example embodiment, the method determines whether the identified errors exceed a threshold number of errors. The method may be utilized to determine if fiber connectivity of the data path has failed when the identified errors exceed the threshold.