American Time SiteSync IQ - Manual (Page 80)

© American Time
80
SiteSync IQ Installation Manual
Glossary
Glossary
Appendix
Tr
oubleshooting
Clock
Installation
System Contr
oller
Installation
Intr
oduction
Analog Clock - A clock that represents time by position of hands on a dial.
CAT 5 Cable - Category 5 Cable. A twisted pair cable type designed for high signal integrity and commonly used in computer networks such
as Ethernet. CAT 5 cable is used for GPS extension cables and Ethernet wiring in the SiteSync IQ System.
CDMA - Code Division Multiple Access. A form of digital encoding used by cellular telephone systems. The SiteSync IQ CDMA option uses
precise timing signals from the sync channel broadcast from CDMA base stations for time synchronization.
Circuit - One of the 6 relay outputs on the SiteSync IQ System Controller.
Client - A computer or other networked device, or a software application, that connects to and request information from a server.
Contact Closure Sync - A common method of synchronizing two devices together by means of a 2-wire connection. The output device
provides a synchronization time pulse once per day at a specified time by closing the connection on the 2-wires leading to the input device.
Daytime Protocol (RFC-867) - A standard, Internet-based timekeeping specification that calls for a timestamp to be sent from a timeserver
as an ASCII character string containing the current date and time. This message is sent from the timeserver as a response to any input on
port 13. The timeserver closes the connection as soon as the timestamp is sent. The SiteSync IQ System Controller is capable of sending and
receiving timestamps via UDP port 13 using this protocol.
DHCP - The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks. A DHCP server can
automatically assign an IP address to the Sitesync IQ system controller when DHCP is enabled.
Digital Clock - A clock that displays time with numerical display (12:00).
Ethernet - A very popular technology for networking computers and other devices. This communication method is used for transmitting and
receiving precise timing signals by the SiteSync IQ System Controller.
Event - Programmed into the SiteSync IQ System Controller with time and date information, as well as a duration or a start/stop
command. For example, Event 0001 may be programmed to execute every Monday, Wednesday and Friday at 10:00 am for 3
seconds.
FCC - Federal Communication Commission. A U.S. government agency in charge of regulating non-federal government use of radio spectrum.
Firewall - A network configuration, usually both hardware and software, that forms a fortress between networked computers within an
organization and those outside the organization. It is commonly used to protect information such as e-mail and data files within a physical
building or organization site.
Gateway - A network device or network point that acts as an entrance to another network, such as the server through which computers on a
local area network (LAN) access the Internet.
Gateway IP Address - The address value for the Gateway device on the network (see Gateway).
GPS - Global Positioning System. A constellation of satellites operated by the United States Military (US Naval Observatory) that broadcast
precisely timed signals from space. These signals are used for extremely accurate global navigation as well as the distribution of precise time.
Internet - A worldwide system of computer networks in which any one computer can get information from/or talk to any other connected
computer using the TCP/IP protocols.
Leap Second - A second of time as measured by an atomic clock, added to or omitted from official timekeeping systems annually to
compensate for changes in the rotation of the earth.
Low-E glass - Low Emissivity Glass. This type of glass features a unique surface coating that reduces the heat transfer through the window.
Such a coating can reflect anywhere from 40% to 70% of the normally transmitted heat, while not inhibiting the amount of light that passes
through the window. However, the metal oxide coating of Low-E glass does not allow the GPS signals to pass through. Thus, mounting the
GPS antenna inside a window with Low-E glass is not recommended.
Master Clock - In a timekeeping or clock system, a device that acts as the source of time. The Master Clock, or System Controller, transmits
the time to any number of secondary (slave) clocks.
Navigation Message - A message, transmitted by each GPS satellite, containing its orbital elements, clock behavior, system time and status
messages.
Network - A group of interconnected computers or other electronic devices, capable of transferring data signals with each other.
NIST - National Institute of Standards and Technology. The Time and Frequency Division, part of NIST's Physics Laboratory, maintains the
standard for frequency and time interval for the United States and provides official time to the United States. This includes traceability from
the GPS timing signals to the NIST national frequency standard.
Patch Cable - A cable with plugs or terminals on each end of the conductor or conductors used to connect circuits of equipment together.
Patch cables are used to connect an individual computer or other device to a network. The SiteSync IQ System Controller can be connected to
an RJ-45 jack with an Ethernet Patch Cable.
RJ-45 - Registered Jack-45. An 8-pin (or 8-wire) modular connector used to attach data transmission devices to standard telephone wiring.
Commonly used in Ethernet data connections and installed in the SiteSync IQ System Controller for physical connection of the Ethernet port.