Home » IBM » C9030-644 » Which option is a valid external time source for the z13s?
A customer is planning to upgrade to a z13s and requires an external time source.
Which option is a valid external time source for the z13s?
A. Support Element
B. 9037 Sysplex Timer
C. NTP server
D. Dial-out modern
Correct Answer: C
Explanation/Reference:
Network Time Protocol (NTP) client support
The external time source (ETS) function of STP can provide accurate time relative to an external time standard for data processing applications. The ETS function is only available when an STP-only CTN is configured. The external time source can be configured by dialing out from the HMC to an available time service such as Automated Computer Time Service (ACTS). Dialing out provides time accuracy for the z Systems timing network only. This function has been generally available since January 31, 2007 when STP became generally available.
An alternative method to obtain accurate time is from an NTP server. Simple Network Time Protocol (SNTP) client support is added to the Server Time Protocol code to interface with NTP servers. NTP client support can provide the same time across heterogeneous platforms in an enterprise with a time accuracy of 100 milliseconds.
References: https://www-03.ibm.com/systems/z/advantages/pso/stp/ntp.html
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