Data Link Layer Loopback Testing for Access Networks
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Solution Overview
Problem
Existing methods for testing and trouble isolation of communications links in access networks require the link to be taken out of service, leading to time-consuming and expensive on-site manual testing, which disrupts customer traffic and is inefficient.
Innovation Solution
A system and method for performing loopback testing at the data link layer, allowing tests to be conducted while the link remains in service by interspersing test data with customer traffic, using a test frame originator to create and analyze loopback test patterns without disrupting service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional loopback testing is performed at the physical layer, then link testing can be conducted, but the link must be taken out of service causing disruption to customer traffic
Solution Approach 1:
The patent segments the data link layer protocol into two distinct virtual channels: a test channel for loopback testing and a service channel for customer traffic. This segmentation allows both testing and service functions to coexist on the same physical link without interfering with each other, resolving the contradiction between performing reliable link testing and maintaining customer traffic continuity.
Solution Approach 2:
The patent introduces a virtual dimension by implementing loopback testing at the data link layer rather than the physical layer. This dimensional shift enables test traffic to be carried within the protocol structure itself, allowing the link to remain in service during testing without physical disruption to customer traffic.
2Measurement precision
If manual on-site testing is performed, then comprehensive link testing can be conducted, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent implements self-service by enabling automated loopback testing through the data link layer protocol itself. The test mechanism is integrated into the network infrastructure, allowing automated testing without requiring manual intervention or on-site technicians, thereby reducing time and cost while maintaining comprehensive testing capability.
Solution Approach 2:
The patent replaces manual mechanical testing procedures with automated protocol-based testing. By substituting manual on-site operations with automated data link layer loopback mechanisms, the system achieves comprehensive link testing without the time consumption and cost associated with manual intervention.
3Ease of operation
If the link is taken out of service for testing, then thorough troubleshooting can be performed, but customer service is disrupted
Solution Approach 1:
The patent segments the data link layer into separate test and service virtual channels, allowing troubleshooting operations to be performed on the test channel while the service channel continues to carry customer traffic uninterrupted. This eliminates service disruption during troubleshooting.
Solution Approach 2:
The patent introduces test traffic as an intermediary element that enables troubleshooting without affecting the primary service. The loopback test traffic acts as a mediator that allows comprehensive troubleshooting to be performed concurrently with ongoing customer service, eliminating the harmful effect of service disruption.
Data Source
AI summary
An apparatus and method for performing automated testing and trouble isolation of a communications link in an access network is described. Communications link testing may occur without taking the communications link out of service for the duration of the test.