Please explain Tx and Rx meaning for CAPsMan Registration Table

I would appreciate if someone could clarify what exactly Tx and Rx relate to in CAPsMan registration table.

I am not sure for what “side” is this relevant?

Is Tx transmit to client from CAP, or reception from client to CAP?

Analogous: is Rx receive from client to CAP or receive on the side of the client from CAP?

Sorry if it is a dumb Q, but I got lost with this.