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## 8.6.3 Configuring External Time Source 

After the new CTN configuration process is completed, you can configure the ETS. In this example, we define two HMCs that are configured as NTP server for ETS (see Figure 8-33 on page 177). If your CTN is configured with more than two CPCs, you can set individual ETS for PTS and BTS. 

Complete the following steps: 

1. Open the Manage System Time  task and select Configure External Time Source  from the STP ACTIONS list. 

2. The Select the system on which to modify the External Time Source (ETS) window opens. Select the CPC for which to modify the ETS setting. We select MUSCA  (the only CPC in this CTN) in this window. Click NEXT  to continue (see Figure 8-45). 

<img src='content_image/981968.jpg'>

