NTP100 – Rev 1.0.1 Dec-04
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© Masterclock
®
, Inc.
Introduction
Introducing the NTP100 Family
The NTP100 is a family of high-precision Ethernet network time servers, utilizing the Network Time Protocol (NTP).
The NTP100 family of NTP time servers, consists of the following NTP100 members:
MODEL
Primary Reference
Secondary Reference
NTP100-GPS
External GPS satellite signal
•
internal GPS receiver
•
requires external GPS antenna
Internal TCXO & RTC
NTP100-TC
External Time Code signal using
•
internal time code decoder
•
requires external SMPTE 30/25/24 fps or
IRIG-B/B(1) time code source
Internal TCXO & RTC
NTP100-OSC
Internal TCXO (
Temperature Compensated Crystal
Oscillator)
, & RTC (real-time clock) reference.
None
Each NTP100 device can operate on a local area network (LAN) or act as an enterprise-wide source for traceably
accurate time and date distribution, depending upon your network configuration.
Each NTP100 device includes the WinDiscovery configuration & management software, as well as a Telnet interface
for configuration and maintenance. Other common features include:
•
Internal clock with temperature controlled oscillator (TCXO), retains time during loss of power (all models) ,GPS
satellite signal (model –GPS), or time code signal (model –TC).
•
Supports NTP broadcast and/or query mode.
•
Fully configurable network settings, including DHCP/BOOTP or Static IP addressing support
•
Security features include password protection of configuration, encrypted communication, and the ability to disable
telnet management access
•
Adjustable time display brightness
•
Status display to remotely monitor status and behavior
•
Selectable Stratum Identification levels
UTC/Greenwich Mean Time
UTC is a time standard which is the basis for the worldwide system of civil time. This time scale is kept by time laboratories
around the world, including the U.S. Naval Observatory, and is determined using highly precise atomic clocks. The UTC
scale is coordinated in Paris by the International Bureau of Weights and Measures (BIPM).
UTC runs at the rate of the atomic clocks, but when the difference between this atomic time and one based on the Earth
approaches one second, a one second adjustment (a "leap second") is made in UTC.
UTC is the local time at the prime reference meridian at Greenwich, England. At a given location on the planet, local time
can be displaced (referenced to UTC) by -11 to +12 hours. North and South America are from -3 to -11 hours delayed; most
of Europe and Africa and all of Asia and Australia are advanced by +1 to +12 hours. Because the NTP time distribution
standard operates with UTC-reference time only, time zone and/or daylight savings (summer) time are not used.
UTC is sometimes colloquially referred to as "Greenwich Mean Time" (abbreviated GMT).
NTP (Network Time Protocol)
NTP is an open-standard time synchronization protocol designed for precision synchronization and maintenance of
time/date on computers and other devices attached to TCP/IP networks. NTP itself is transported with the UDP/IP
(User Datagram Protocol), and is usually served on port 123. NTP time/date is UTC-referenced, as the protocol has no
provisions for representing time zones or daylight savings (summer) time.
