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timeserver.info
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2001-02-23
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The NIST Network Time Server is synchronized to the NIST cesium
clock ensemble. The server transmits time using three common internet
protocols: the daytime protocol, which uses tcp/ip port 13, the time
protocol on udp/ip port 37 and the NTP (Network Time Protocol), which
uses udp/ip port 123. The tcp/ip protocol is the simplest one to use.
Its transmissions provide advance notice of leap seconds and of the
transitions to and from Daylight Saving Time (based on the US transition
dates of the first Sunday in April and the last Sunday in October).
You can get a copy of the tcp/ip client software to access the NIST
network time servers via anonymous ftp from any NIST time server. For
example, use ftp to connect to
time-b.timefreq.bldrdoc.gov
and the software is in directory /pub/daytime. In that directory
you will find the source code and the makefile for building a
version for any BSD-compatible UNIX machine. The program will also
work unchanged on many machines that are based on System V but have
the ability to emulate BSD Sockets. Instructions are in file
nistime.man. After you have built the client software to access
the NIST server, you may run it manually at any time or you may run
it periodically using utilities such as "cron" or something equivalent.
If you wish to use it to set the time as part of the bootstrap process,
then you should add a call to run it from the startup script, which is
usually in a file named /etc/rc.local.
This code can also be used on an MSDOS PC if it has TCP/IP with a
network interface that emulates BSD sockets. If your PC meets
this requirement, you may use the same source code or you may
copy the compiled and linked MSDOS program from the same directory.
Two version of this program are available depending on what kind
of network software you have. If you have tcp/ip software (such
as PC/TCP), then you can use nistimen.exe. Instructions for using
it are in file nistimen.man; if you have a packet-driver, the
corresponding files are nistimep.exe and nistimep.man. Note that
while both .man files are normal text files, you must copy the
.exe files in binary (image) mode.
This directory also has compiled and linked versions for Windows
systems. The file nistimew.exe is for Windows 3.x/95/98 and
nistime-32bit.exe is for Windows 98/2000/NT/Me. All of the versions will
probably work in most Windows environments, but only the 32-bit version can
set the clock on an NT system.
There are other programs available via anonymous ftp from
the same server such as the current version of the ACTS software.
This software connects to our time service via normal dial-up
telephone lines. It can be configured to run either in a UNIX
(BSD or System V derivative) or MS-DOS (IBM-PC or equivalent)
environment. This software is in directory /pub/acts.
Additional technical information is available by sending
a specific message to time@time.nist.gov or by calling
Judah Levine
Time and Frequency Division
NIST
(303) 497 3903
Comments in writing may be addressed to:
Network Time Service
Joint Institute for Laboratory Astrophysics
Campus Box 440
University of Colorado
Boulder, Colorado 80309
or
Network Time Service
Time and Frequency Division - 847
National Institute of Standards and Technology
325 Broadway
Boulder, Colorado 80303