American Time SiteSync IQ - Manual (Page 81)

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© American Time
SiteSync IQ Installation Manual
Glossary
RS-422 - Standard communications interface approved by the Electronic Industries Alliance (EIA) for connecting serial devices and
supporting multi-point connections. This interface supports higher data rates and higher immunity from interference than RS-232 and is used
for communication between the SiteSync IQ System Controller and the Premium GPS receiver.
Schedule - A group of events. For example, a school might program Schedule 01 with 4 events for their morning Elementary recess schedule.
The SiteSync IQ System Controller allows for 99 unique schedules, with any number of events in each (up to a maximum total of 9,999 events).
Secondary Clock - Also known as a slave clock. This is a clock that synchronizes its timekeeping to that of a system master clock.
Server - A host computer or host device on a network, which shares resources and "serves" data to client computers or other servers.
Shrink Tubing - Tubing which has been extruded, cross-linked and mechanically expanded which, when reheated, will return to its original
diameter. For this GPS kit, it is used to protect the electrical and communications connections from water, etc. It can be easily installed over
the connectors and will shrink tightly over them after being heated.
SNTP - Simple Network Time Protocol. A less complex form of Network Time Protocol (NTP) commonly used for synchronization of computers
and other devices. In SNTP, the client makes a single timing request to a single server (similar to the Daytime Protocol) and then uses this
information to set its clock. This differs from NTP, which uses multiple servers and averages their results. The SiteSync IQ System controller
supports SNTP as both a client and a server.
Static IP Address - An Internet Protocol (network) address permanently assigned to an individual machine, account or user.
Subnet Mask - A number that helps to define the relationship between the host (computers, routers, switches, etc.) and the rest of the
network.
Synchronization - The process of bringing two clocks or time sources into phase so their difference is zero. In the case of a timekeeping
system, time synchronization takes place between the master clock and all secondary clocks. In addition, in the case of the GPS timekeeping
option, the SiteSync IQ System Controller is synchronized to the GPS time source so the time output of the master is matched to the NIST
time standard.
Timeserver - A system or device that acquires the correct time from a local reference clock and/or remote timeservers and will answer time
requests from other systems. See "Server" above.
Timeserver IP Address - The value of an address for a timekeeping server on the local computer network or Public Internet.
Timestamp - A time mark or notation that indicates the date and time.
UDP - User Datagram Protocol. An Ethernet protocol commonly used for time sensitive applications and which does not guarantee reliability,
but does not delay packets (as in TCP-IP).
UL - Underwriters Laboratory. U.S. non-profit safety testing and certification organization.
USNO - U.S. Naval Observatory. An organization within the United States Navy which determines precise time and maintains the master clock
for the United States. The USNO monitors the timing of the Global Positioning System (GPS) to provide a reliable and stable coordinated time
reference for the GPS satellite navigation system.
UTC - Universal Coordinated Time. A time-scale that forms the basis of a coordinated distribution of standard frequencies and time signals
throughout the world. It is often referred to as Greenwich Mean Time (GMT) or Zulu Time (military and aviation).
Glossary
Appendix
Troubleshooting
Clock
Installation
System Contr
oller
Installation
Intr
oduction
American Time
140 3rd Street South, PO Box 707
Dassel, MN 55325-0707
Phone: 800-328-8996
Fax: 800-789-1882
american-time.com