SWRA615A June 2019 CC1352P , CC1352R , CC2530 , CC2531 , CC2538 , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP
Inside centralized security networks, TC link keys are used for transferring the initial and future network keys. The initial TC link key will either be the Trust Center's well-known default, derived from a pre-configured install code, or explicitly defined. As mentioned in the Trust Center Link Key Updates section, R21 devices must update their TC link key as part of the network joining procedure.