{"id":12825,"date":"2026-03-13T09:56:47","date_gmt":"2026-03-13T09:56:47","guid":{"rendered":"https:\/\/developer.rdkcentral.com\/documentation\/?page_id=12825"},"modified":"2026-03-13T10:41:31","modified_gmt":"2026-03-13T10:41:31","slug":"epon-manager-component-design","status":"publish","type":"page","link":"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_broadband_documentation\/components\/epon-manager\/epon-manager-component-design\/","title":{"rendered":"EPON Manager &#8211; Component Design"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. EPON Controller (Main Component)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Responsibilities\">Responsibilities<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Initialize all subsystems (logger, RBus, telemetry, HAL)<\/li>\n\n\n\n<li>Coordinate between threads and modules<\/li>\n\n\n\n<li>Main event loop and lifecycle management<\/li>\n\n\n\n<li>Resource cleanup on shutdown<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-InitializationSequence\">Initialization Sequence<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">epon_controller_init()\n  > logger_init()\n  > rbus_thread_start()\n  > telemetry_init()\n  > epon_data_init()\n  > hal_event_listener_start()\n  > hal_init()\n      - Register onu_status_callback\n      - Register interface_status_callback\n      - Register alarm_callback\n  > stats_polling_thread_start()\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-KeyFunctions\">Key Functions<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>System initialization and startup<\/li>\n\n\n\n<li>Thread creation and management<\/li>\n\n\n\n<li>Graceful shutdown handling<\/li>\n\n\n\n<li>Error recovery coordination<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-2.HALEventListenerThread\">2. HAL Event Listener Thread<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Responsibilities.1\">Responsibilities<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Receive events from EPON HAL via registered callbacks<\/li>\n\n\n\n<li>Parse and categorize incoming events (ONU status and interface status)<\/li>\n\n\n\n<li>Dispatch events to appropriate handlers<\/li>\n\n\n\n<li>Maintain event processing statistics<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-EventTypesHandled\">Event Types Handled<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-ONUStatusCallbackEvents(epon_onu_status_t)\">ONU Status Callback Events (epon_onu_status_t)<\/h4>\n\n\n\n<p>Simplified overall ONU status.\u00a0<\/p>\n\n\n\n<p><strong>These events are for internal state tracking and logging only\u2014they do NOT trigger WanManager updates.<\/strong><\/p>\n\n\n\n<p><strong>Respective&nbsp;<code>epon_onu_interface_status_t<\/code>&nbsp;should be updated by the HAL in case of ONU status changes.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EPON_ONU_STATUS_LOS<\/strong>&nbsp;(Loss of Signal):\n<ul class=\"wp-block-list\">\n<li>Update internal EPON ONU status to DOWN<\/li>\n\n\n\n<li>Log event with WARNING severity<\/li>\n\n\n\n<li>Raise telemetry event<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>EPON_ONU_STATUS_DOWNSTREAM_SIGNAL_DETECTED<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Update internal EPON ONU status to Initializing<\/li>\n\n\n\n<li>Log transition state<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>EPON_ONU_STATUS_REGISTRATION<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Update internal EPON ONU status to UP<\/li>\n\n\n\n<li>Log successful registration<\/li>\n\n\n\n<li>Raise telemetry event<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>EPON_ONU_STATUS_DEREGISTRATION<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Update internal EPON ONU status to DOWN<\/li>\n\n\n\n<li>Log deregistration event<\/li>\n\n\n\n<li>Raise telemetry event<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-InterfaceStatusCallbackEvents(epon_onu_interface_status_t)\">Interface Status Callback Events (epon_onu_interface_status_t)<\/h4>\n\n\n\n<p><strong>PRIMARY EVENT<\/strong>: Per-interface status changes for virtual interfaces (veip0, veip1, etc.).&nbsp;<strong>These events trigger WanManager updates.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Interface LINK_UP<\/strong>&nbsp;(e.g., veip0):\n<ul class=\"wp-block-list\">\n<li>Update interface status in internal cache<\/li>\n\n\n\n<li>Add interface to active interface list<\/li>\n\n\n\n<li><strong>Notify WanManager of interface availability via RBus<\/strong>&nbsp;(primary action) &#8211; If any of the interfaces go UP, WanManager should be notified that EPON PHY is UP &#8211; Update WanManager virtual interface list with interface name and status<\/li>\n\n\n\n<li>Raise telemetry event for interface UP<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Interface LINK_DOWN<\/strong>&nbsp;(e.g., veip0):\n<ul class=\"wp-block-list\">\n<li>Update interface status in internal cache<\/li>\n\n\n\n<li>Remove interface from active interface list<\/li>\n\n\n\n<li><strong>Notify WanManager of interface down via RBus<\/strong>&nbsp;(primary action) &#8211; If all of the interfaces go DOWN, WanManager should be notified that EPON PHY is DOWN &#8211; Update WanManager virtual interface list with interface name and status<\/li>\n\n\n\n<li>Raise telemetry event for interface DOWN<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-EventProcessingFlow\">Event Processing Flow<\/h3>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Stats Polling Thread (Harvester)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Responsibilities.2\">Responsibilities<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Periodically poll statistics from EPON HAL<\/li>\n\n\n\n<li>Update internal cache with fresh data<\/li>\n\n\n\n<li>Push statistics to telemetry system<\/li>\n\n\n\n<li>Maintain polling schedule<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Configuration\">Configuration<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Default Interval<\/strong>: 15 minutes (900 seconds)<\/li>\n\n\n\n<li><strong>Configurable<\/strong>: Via rbus<\/li>\n\n\n\n<li><strong>Optional<\/strong>: Can be disabled if not needed<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-OperationFlow\">Operation Flow<br><br>&nbsp;<strong>Statistics Collected<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Interface statistics (TX\/RX bytes, packets, errors)<\/li>\n\n\n\n<li>ONU operational parameters<\/li>\n\n\n\n<li>Link quality metrics<\/li>\n\n\n\n<li>Performance counters<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. RBus\/DBus Thread<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Responsibilities.3\">Responsibilities<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Initialize and maintain bus connection<\/li>\n\n\n\n<li>Register TR-181 DML parameters<\/li>\n\n\n\n<li>Handle incoming GET\/SET requests<\/li>\n\n\n\n<li>Publish events to other RDK components<\/li>\n\n\n\n<li>Update WanManager with PHY status and interface list<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-TR-181RequestHandling\">TR-181 Request Handling<br><br><strong>Key Operations<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DML parameter registration<\/li>\n\n\n\n<li>Request validation and processing<\/li>\n\n\n\n<li>Cache-aware GET operations<\/li>\n\n\n\n<li>Event publication<\/li>\n\n\n\n<li>WanManager interface<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-5.TelemetryModule\">5. Telemetry Module<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Responsibilities.4\">Responsibilities<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Register with T2 telemetry system<\/li>\n\n\n\n<li>Format and report telemetry events<\/li>\n\n\n\n<li>Submit periodic statistics<\/li>\n\n\n\n<li>Handle telemetry markers<\/li>\n<\/ul>\n\n\n\n<p><strong>Integration Points<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>T2 telemetry service<\/li>\n\n\n\n<li>Event formatting and submission<\/li>\n\n\n\n<li>Statistics aggregation<\/li>\n\n\n\n<li>Marker management<\/li>\n<\/ul>\n\n\n\n<p><strong>Event Types<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Link events<\/strong>: UP\/DOWN transitions<\/li>\n\n\n\n<li><strong>Alarm events<\/strong>: Critical\/Error alarms<\/li>\n\n\n\n<li><strong>Statistics events<\/strong>: Periodic metrics<\/li>\n\n\n\n<li><strong>Error events<\/strong>: System errors<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Logger Module<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Responsibilities.5\">Responsibilities<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Initialize RDK logger subsystem<\/li>\n\n\n\n<li>Provide logging API wrapper<\/li>\n\n\n\n<li>Support multiple log levels<\/li>\n\n\n\n<li>Optional HAL logging integration<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-LogLevels\">Log Levels<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Level<\/td><td>Usage<\/td><td>Example<\/td><\/tr><tr><td><strong>FATAL<\/strong><\/td><td>System-critical errors<\/td><td>Failed initialization<\/td><\/tr><tr><td><strong>ERROR<\/strong><\/td><td>Component errors<\/td><td>HAL call failure<\/td><\/tr><tr><td><strong>WARNING<\/strong><\/td><td>Abnormal conditions<\/td><td>Cache miss threshold<\/td><\/tr><tr><td><strong>INFO<\/strong><\/td><td>Normal operations<\/td><td>Link status change<\/td><\/tr><tr><td><strong>DEBUG<\/strong><\/td><td>Detailed debugging<\/td><td>Event queue details<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"EPONManagerComponentDesign-Features\">Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Runtime log level configuration<\/li>\n\n\n\n<li>Component-specific logging<\/li>\n\n\n\n<li>HAL library integration (optional)<\/li>\n\n\n\n<li>Thread-safe logging<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. HAL Wrapper with Cache<\/h2>\n\n\n\n<p><strong>Responsibilities<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Provide abstraction layer for HAL calls<\/li>\n\n\n\n<li>Cache statistics with TTL (Time To Live)<\/li>\n\n\n\n<li>Check cache validity before making HAL calls<\/li>\n\n\n\n<li>Thread-safe access with automatic expiration<\/li>\n\n\n\n<li>Forward calls to HAL only when cache miss occurs<\/li>\n\n\n\n<li>Memory management for cached data<\/li>\n<\/ul>\n\n\n\n<p><strong>Architecture<\/strong><\/p>\n\n\n\n<p><br>&nbsp;<strong>Cache Operations<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Get<\/strong>: Retrieve value with cache validity check<\/li>\n\n\n\n<li><strong>Set<\/strong>: Store value and invalidate if needed<\/li>\n\n\n\n<li><strong>Invalidate<\/strong>: Force cache expiration<\/li>\n\n\n\n<li><strong>Cleanup<\/strong>: Remove expired entries<\/li>\n<\/ul>\n\n\n\n<p><strong>Cache Policy<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TTL<\/strong>: 30 seconds (default, configurable)<\/li>\n\n\n\n<li><strong>Strategy<\/strong>: Time-based expiration with lazy cleanup<\/li>\n\n\n\n<li><strong>Thread Safety<\/strong>: Mutex-protected (RW lock recommended)<\/li>\n\n\n\n<li><strong>Bypass<\/strong>: Controller can bypass cache for direct HAL calls<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Error Handling<\/p>\n\n\n\n<p><strong>Strategy<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Initialization Errors<\/strong>: Retry with backoff, log and exit if persistent<\/li>\n\n\n\n<li><strong>Runtime Errors<\/strong>: Log, attempt recovery, continue operation<\/li>\n\n\n\n<li><strong>Critical Errors<\/strong>: Notify watchdog, trigger restart if needed<\/li>\n<\/ul>\n\n\n\n<p><strong>Recovery Mechanisms<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>HAL Failure<\/strong>: Retry with exponential backoff (max 3 attempts)<\/li>\n\n\n\n<li><strong>RBus Disconnection<\/strong>: Auto-reconnect with retry logic<\/li>\n\n\n\n<li><strong>Thread Crash<\/strong>: Watchdog detection and restart<\/li>\n\n\n\n<li><strong>Cache Corruption<\/strong>: Clear and rebuild cache<\/li>\n\n\n\n<li><strong>Memory Issues<\/strong>: Cleanup and resource management<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>1. EPON Controller (Main Component) Responsibilities Initialization Sequence Key Functions 2. HAL Event Listener Thread [&hellip;]<\/p>\n","protected":false},"author":659,"featured_media":0,"parent":12819,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-12825","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>EPON Manager - Component Design - RDK Documentation Portal | Documentation<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_broadband_documentation\/components\/epon-manager\/epon-manager-component-design\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"EPON Manager - Component Design - RDK Documentation Portal | Documentation\" \/>\n<meta property=\"og:description\" content=\"1. 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