1# Common Events of the Network Management Subsystem 2This document lists the common system events provided by the network management subsystem to applications. Applications can use [APIs](../js-apis-commonEventManager.md) to subscribe to common system events. 3 4 5## COMMON_EVENT_CONNECTIVITY_CHANGE<sup>10+<sup> 6 7Indicates that the network connection state has changed. 8 9- Value: usual.event.CONNECTIVITY_CHANGE 10- Required subscriber permissions: none 11 12When the (Ethernet, Wi-Fi, or cellular) network connection state changes (to disconnected, connecting, or connected), the event notification service is triggered to publish this event. 13 14## COMMON_EVENT_AIRPLANE_MODE_CHANGED<sup>10+<sup> 15 16Indicates that the airplane mode state has changed. 17 18- Value: usual.event.AIRPLANE_MODE 19- Required subscriber permissions: none 20 21When the airplane mode is set, the event notification service is triggered to publish this event. 22 23## COMMON_EVENT_HTTP_PROXY_CHANGE<sup>10+<sup> 24 25Indicates that the HTTP proxy configuration has changed. 26 27- Value: usual.event.HTTP_PROXY_CHANGE 28- Required subscriber permissions: none 29 30When the configuration of the global or network-specific (such as Ethernet and Wi-Fi) HTTP proxy changes, the event notification service is triggered to publish this event. 31 32## COMMON_EVENT_NET_QUOTA_WARNING<sup>10+<sup> 33 34Indicates that the network data usage has reached the alarm threshold. 35 36- Value: usual.event.QUOTA_WARNING 37- Required subscriber permissions: none 38 39When the network data usage reaches 80% of the limit, the event notification service is triggered to publish this event. 40 41## COMMON_EVENT_NET_QUOTA_LIMIT_REMINDED<sup>10+<sup> 42 43Indicates that the network data usage has reached the upper limit, and network access is still available. 44 45- Value: usual.event.NET_QUOTA_LIMIT_REMINDED 46- Required subscriber permissions: none 47 48When the network data usage reaches the upper limit and the user chooses to continue to use the network, the event notification service is triggered to publish this event. 49 50## COMMON_EVENT_NET_QUOTA_LIMIT<sup>10+<sup> 51 52Indicates that the network data usage has reached the upper limit, and network access becomes unavailable. 53 54- Value: usual.event.NET_QUOTA_LIMIT 55- Required subscriber permissions: none 56 57When the network data usage reaches the upper limit and continuing to use the network is not allowed, the event notification service is triggered to publish this event. 58