DOCSIS Test System Selecting Unused Channels
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Solution Overview
Problem
Current DOCSIS network testers are limited in analyzing the downstream path from the Cable Modem Termination System (CMTS) to the Cable Modem (CM) as they cannot actively test unused channels without disrupting active data flow, making it difficult to verify channel integrity and performance.
Innovation Solution
A test system that acquires an upstream channel descriptor list, enters a pause network state when the list is complete, and allows the operator to select a particular channel for testing, enabling proactive analysis of available channels without disrupting active data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the test device actively monitors data traffic on subscribed channels, then channel analysis is performed, but the device cannot test unused channels without disrupting active data flow
Solution Approach 1:
The test device enters a pause network state before testing channels, preparing the network in advance to accept testing without disrupting active data flow. This preliminary state change allows the device to select and test specific channels from the upstream channel descriptor list while maintaining network stability and preventing disruption to ongoing data transmissions.
2Ease of operation
If the DOCSIS protocol restores a device to the last known working channel, then device reconnection is simplified, but the test device cannot verify multiple unused channels
Solution Approach 1:
The pause network state acts as an intermediary condition that allows the test device to temporarily disconnect from automatic channel restoration while maintaining the ability to reconnect. This intermediate state enables the device to select and test multiple channels from the upstream channel descriptor list without being immediately restored to the last known working channel, thus allowing comprehensive channel verification while preserving ease of reconnection when needed.
3Measurement precision
If the test equipment is coupled to cable test points for signal analysis, then downstream path analysis is enabled, but active testing of unused channels disrupts data flow to CMs
Solution Approach 1:
The test device enters a pause network state before performing signal analysis on unused channels. This preliminary action prepares the testing environment to allow precise signal measurements without disrupting active data flow to cable modems. By pausing the network state in advance, the device can accurately analyze downstream signals on selected channels while maintaining data transmission integrity for active users.
Data Source
AI summary
A test system comprising: acquiring an upstream channel descriptor list; entering a pause network state when the upstream channel descriptor list is completed; and selecting a particular channel from the upstream channel descriptor list before exiting the pause network state.