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S100 User Guide – Rev. D – June 2005 1
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Chapter 1

Introduction and Overview
The S100 provides computers and network devices secure synchronization to UTC time
using Network Time Protocol (NTP). The S100 can use the Global Positioning System
(GPS), NIST's Automated Computer Time Service (ACTS), or another NTP server as a time
reference.
This User Guide describes the installation and operation of the S100. It is written for network
administrators familiar with network configuration and operations.
The chapters and appendices address topics including:
• Installation, configuration, and operation
• The User Interface
• How the S100 works
• FAQ and Solutions
Here are shortcuts to those sections that answer frequently-asked “how to” or “How do I...?”
questions.
How to... Go here for the answer
Acquire time “How to Acquire Time” on page 30
Choose and configure your time source “Choose Your Time Source” on
page 33
Determine the default User Name and
Password “Setting Up the IP Address” on
page 26
Get Technical Support “Appendix D” on page 137
Get time from ACTS dial-up “Dialup Settings dialog” on page 38
Get time from GPS “GPS” on page 35
Figure 1-1: The S100