ONT POTS Line Management During Network Maintenance
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Solution Overview
Problem
Software or hardware upgrades to Optical Network Terminals (ONTs) and Optical Line Terminals (OLTs) in Fiber-To-The-Premises networks cause temporary communication interruptions, leading to false alarms in alarm systems connected via Plain Old Telephone System (POTS) lines, as the reboot process can deactivate POTS lines, triggering alarms even during planned maintenance.
Innovation Solution
Implementing nonvolatile memory in ONTs to store POTS line data and using timers to maintain differential voltage on POTS lines during reboots, ensuring the alarm system does not trigger false alarms by reactivating the lines before communication is reestablished and allowing the system to detect actual cuts in optical fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software or hardware upgrades are performed on ONTs or OLTs, then system functionality and performance are improved, but communication interruptions occur causing POTS lines to deactivate and triggering false alarms
Solution Approach 1:
The system performs preliminary actions by detecting communication interruptions before they fully propagate to deactivate POTS lines. The ONT detects loss of communication with the OLT and proactively maintains POTS line activation state during the interruption period, preventing false alarm triggers before they occur.
Solution Approach 2:
The patent introduces an intermediary detection and control mechanism between the communication interruption event and the POTS line state change. The ONT acts as an intermediary that intercepts the deactivation signal pathway, detecting communication failures and preventing them from automatically deactivating POTS lines, thus mediating between network maintenance activities and alarm system operation.
2Measurement precision
If POTS lines are deactivated during communication interruptions, then the alarm system can detect actual security breaches, but false alarms are generated during planned maintenance
Solution Approach 1:
The system applies preliminary anti-action by implementing a countermeasure that prevents the harmful effect (false alarm) before it occurs. When communication interruption is detected, the system proactively counteracts the automatic POTS line deactivation that would normally trigger false alarms, thereby preventing the harmful effect in advance while maintaining the ability to detect actual security breaches.
Solution Approach 2:
The patent implements a feedback mechanism where the ONT continuously monitors communication status with the OLT and uses this feedback to dynamically control POTS line activation. The system receives feedback about communication interruptions and adjusts POTS line states accordingly, maintaining activation during planned maintenance while allowing deactivation for actual security events.
3Adaptability or versatility
If the ONT reboots during software upgrades, then updated functionality is achieved, but POTS line activation is lost requiring reestablishment
Solution Approach 1:
The patent ensures continuity of useful action by maintaining POTS line activation state during ONT reboot operations. The system preserves the functional state of POTS lines across reboot events, ensuring that alarm systems remain active and operational throughout the software update process without requiring reactivation or causing service interruptions.
Data Source
AI summary
An apparatus or corresponding method of managing Plain Old Telephone Service (POTS) lines in a Passive Optical Network (PON) to prevent an alarm system from generating an alarm during a software upgrade or maintenance of an Optical Network Terminal (ONT), Optical Line Terminal (OLT), or PON while maintaining the effectiveness of the alarm system. The ONT may store data related to a POTS line in nonvolatile memory. The ONT may activate the POTS line based on the data from the nonvolatile memory in an event of interruption in communications with an OLT prior to reestablishing communications with the OLT. The interruption in communications may be caused by an ONT reboot to complete an installation of a software upgrade. The ONT may energize the POTS line with a voltage in response to activating the POTS line to prevent the alarm system from generating the alarm.