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S100 User Guide – Rev. D – June 2005 109
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Chapter 6
Frequently Asked Questions
Questions
How can we obtain NTP client software to use with the S100?
NTP client software information and configuration details are available from http://
www.ntp-systems.com
Client software and configuration information for Unix platforms can be downloaded from
http://www.ntp.org.
SNTP client software is included with the S100 hardware.
What are the main differences between SNTP and NTP clients?
SNTP (Simple Network Time Protocol), based on RFC 1361/RFC 2030, gets its time from the
specified time servers of the machine on which it is installed.
NTP, Network Time Protocol, is based on RFCs 1305 and 1119, and can be configured to
obtain and distribute the time on the network. It has a built-in algorithm that calculates the
time accurately up to 1-10 milliseconds. The algorithm can be configured to obtain time from
an alternate source in case the original time server fails or gets out of synchronization.
Is there a way to get GPS time instead of UTC time from the S100?
The S100 normally provides UTC time. However, it can be configured to output GPS time—
currently UTC + 13 seconds—by making several hardware changes to the unit. Contact your
Symmetricom representative about this.
What outputs are available on the S100?
These are:
• Dual Ethernet 10/100BaseT (RJ 45)
• RS-232 Serial Console (DCE)
• Sysplex timer port