8. After clicking  NEXT , we check the configuration before confirming any changes, as shown  in Figure 16-16. Figure 16-16 Single Server CTN (pending Confirm Changes) 9. After the configuration is applied, the CTN is active and the CPC time of day is directed to  the ETS. The result is shown in Figure 16-17 on page 401.  Saving the CTN configuration across PORs:  The resulting default configuration allows  other CPC to be added to this CTN (“unrestricted CTN”). However, because no coupling  links are used, this addition is not possible.  Also, the configuration of an unrestricted CTN does not persist after a Power-on-Reset  (POR); that is, the configuration is not saved. Therefore, the CTN must be reconfigured  after a POR. To save the CTN configuration across PORs, the CTN membership must be restricted as  described next. 400  IBM z14 Model ZR1 Configuration Setup