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what does the NWK_END_DEV_TIMEOUT_DEFAULT value mean?

Hi All

        what does  the NWK_END_DEV_TIMEOUT_DEFAULT value mean?

       i  saw this vaule is set in the ZGlobals.h , as like  below:

       // Child aging management default values
// Values are specified in table of nwk_globals.h module
//timeoutValue[15]
//    10, // 0 10 seconds
//     2, // 1 2 minutes
//     4, // 2 4 minutes
//     8, // 3 8 minutes
//    16, // 4 16 minutes
//    32, // 5 32 minutes
//    64, // 6 64 minutes
//   128, // 7 128 minutes
//   256, // 8 256 minutes
//   512, // 9 512 minutes
//  1024, // 10 1024 minutes
//  2048, // 11 2048 minutes
//  4096, // 12 4096 minutes
//  8192, // 13 8192 minutes
// 16384 // 14 16384 minutes
//
// This value is used by the parent ROUTER
#if !defined ( NWK_END_DEV_TIMEOUT_DEFAULT )
  #define NWK_END_DEV_TIMEOUT_DEFAULT  8    // Default value per ZigBee core specification
#endif

     

   does  “8 ”   mean  the router will keep the node info for 256 minutes, if there is not more msg come from the node  after 256 minutes,it will delete its short address and network information.

BR!