Inova OnTimeTM owner manual Appendix B Sntp Basics

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Inova OnTime Digital Clock Owner's Manual

Appendix B: SNTP Basics

SNTP is an acronym for Simple Network Time Protocol. SNTP is widely used to synchronize time on computers. Certain computers within a LAN or on the internet have the responsibility of maintaining accurate time in order to provide a time standard for the network. Your network administrator should be able to direct you to an appropriate local time server for your environment.

The OnTime Digital Clock must be configured with the network location of a time server. The default time server is an internet time server operated by Inova.

Periodically, a computer transmits a time query in order to synchronize its time with a time server. Every two hours the OnTime Digital Clock transmits a time query to the time server and the time server replies. With the reply in hand, the clock calculates the time offset, or correction, that it needs to apply to its current time and then makes the update.

In the event that the time server does not reply, the OnTime Digital Clock continues to display time while it retries the time server. After repeated unsuccessful tries, the clock illuminates its Service Light (an LED dot at the lower right-hand side of the clock), indicating that the displayed time is no longer synchronized.

All claims based on information publicly available at time of printing. All other product or service names mentioned in this document may be

trademarks of the companies with which they are associated. © 2007 Inova Solutions. All rights reserved. 6.12.2007 page 27

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Contents Inova OnTimeTM Digital Clock Inova OnTimeTM Digital Clock Table of Contents Maintenance Product Warranty Recording Static IP Addresses or Host NamesFigures TablesIntroduction to Inova OnTimeTM Digital Clocks Safety Instructions ONT4 Models ONT6 Models Technical SpecificationsTechnical Specifications Unpacking and Installation Surface MountingPendant Mounting Single or Double Pendant MountingCantilever Mounting Single or Double Cantilever MountingPage Digital Clock Configuration Configuration Method Description ReferenceWith a clock configuration string. Clocks will Clock Configuration MethodsUsing Dhcp for Addressing and Configuration Configuration PlanningPage Creating a Dhcp Configuration String Configuration SettingOption Name Option ValueSetting a Different Dhcp Option Number on a Clock Verifying the Dhcp Configuration Settings on a ClockCommand Description Examples of Common Dhcp Configuration StringsDhcp Configuration Example for Microsoft Server Telnet Configuration Accessing Telnet Command Line and SigningAccessing Help Commands Setting the Dhcp AddressAssigning an IP Address Display ? or help displaySetting the Static IP Address Specifying a Time ServerTesting the Time Server Synchronization Selecting the Time Server Selecting Time ZonesConfiguring Daylight Saving Time Configuring 12/24 Time FormatConfiguring AM/PM Indicator Configuring Colons On/OffTroubleshooting Troubleshooting OnTime Digital ClockRecording Static IP Addresses or Host Names Recording IP Addresses or Host NamesMaintenance Product Warranty Repair and ReturnGlossary of Terms CantileverAppendix a Digital Clock Configuration SolutionCondition Display ? or help displaySntp -s ArpReboot Configuration Commands NetstatAppendix B Sntp Basics Appendix C Configuring Dhcp Options for Microsoft Servers