How to keep accurate time on your PC
'S PC have an internal clock real-time system designed to receive time. The internal clock of relying on relatively low-cost crystal oscillators, which are notoriously inaccurate. In many cases, the PC system time can drift by several minutes each day. This article describes the various methods of maintaining a precise time on your PC. It describes how to use the time references, Internet radio and GPS clocks and dedicated NTP server systems.
Internet TimeReferences
Internet using the Network Time Protocol in order to distribute accurate time information to customers timing network. NTP is an important part of the Internet for more than 25 years. The protocol was born with the need to synchronize the estimated time-critical processes on the Internet.
Most modern operating systems like Windows XP, 2003 and Linux have the ability to time with an NTP server for synchronization. There are a number of Internet-based NTP server with the publicAccess, which can be used to synchronize your PC. The following is a list of the most popular Internet-based access to the public NTP servers References:
time.nist.gov – schedules of the United States on the basis of reference
ptbtime1.ptb.de – time reference German
ntp.my-inbox.co.uk – UK Time reference
canon.inria.fr – French Time reference
clock.isc.org – time Canadian reference
Windows XP is preinstalled client software SNTP time with an NTP server for synchronization. This is achievedsimply entering the domain name of an internet NTP time server tab in Properties. The host computer, then sync to the NTP server at regular intervals and the system time reference specified.
Linux and UNIX systems have the NTP software distribution is available on the website ntp.org NTP. NTP application is running as a daemon, constantly monitoring the NTP server specified. The application reads a list of NTP servers from ntp.conf configuration file ', and at regular intervalsTime sync. A list of references is the configuration of the NTP server 'server' command as shown:
A.nist.gov server time #-NIST, Gaithersburg, Maryland NTP server
C.timefreq.bldrdoc.gov Time Server # NIST, Boulder, Colorado NTP server
Once configured, the NTP daemon is started, stopped and restarted with the commands: 'ntpd start', 'ntpd stop' and 'ntpd start' again.
Radio and GPS time references
There are many commercially availableRadio and GPS Timing Clock see References for the radio PC 'clocks and GPS to get the correct time from the national calendar, radio or references the GPS system. The devices are serial or USB interfaces to provide a precise reference calendar for the PC s. 'driver periodically synchronize the system time on the computer in relation to time received. Often, drivers of the reference clock may be available that provides an interface for application software to provide your personal NTP NTPServer.
Weather radio receivers often have the advantage of being given the opportunity to get a good signal at home, close to the host computer. However, the signal can be received locally at the transmitter. There are a number of radio broadcasts available: MSF will be transferred from Rugby, United Kingdom; transferred from DCF 77 Frankfurt, Germany; WWVB transferred from Colorado, USA; CHU, Canada, and TDF, France. GPS has the advantage that a global time and frequency solution, but aexternal antenna is required, which can be useful.
NTP servers dedicated
NTP servers are dedicated servers that receive time from an external source, such as radio or GPS, and provide a network with a precise reference calendar. NTP servers are typically rack-mount devices with external antenna and an Ethernet connection. The unit of time to receive from a radio or GPS timing reference and the maintenance of an accurate internal time. The exact time will be distributedtime customers over an IP network. NTP servers dedicated, often minimizing the installation and configuration effort needed to bring an NTP server up and running.