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8AL90208USAD ed01
November 20, 2008
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D NTP Servers
Overview
Purpose
This appendix presents the available NTP servers.
NTP Servers: US
The Alcatel-Lucent OmniTouch Advanced Communications Server requires an external
time reference to maintain the accuracy of its system clock. If you do not run a NTP server
within your organization, you may use one of the publicly accessible time servers used by
the NIST Internet Time Service (ITS). The OmniTouch ACS server ships with
us.pool.ntp.org as the default. This is an NTP round robin, giving a different NTP server
with each access. This assures that if one NTP server is unavailable, another will be
accessed.
However, if you prefer to use a single NTP server, the table below lists publicly accessible
servers. It was obtained at http://www.boulder.nist.gov/timefreq/service/time-servers.html
Table D-1 NTP Servers: US
Name IP Address Location
time-a.nist.gov 129.6.15.28 NIST, Gaithersburg, Maryland
time-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland
time-a.timefreq.bldrdoc.gov 132.163.4.101 NIST, Boulder, Colorado
time-b.timefreq.bldrdoc.gov 132.163.4.102 NIST, Boulder, Colorado
time-c.timefreq.bldrdoc.gov 132.163.4.103 NIST, Boulder, Colorado
utcnist.colorado.edu 128.138.140.44 University of Colorado, Boulder
time.nist.gov 192.43.244.18 NCAR, Boulder, Colorado
time-nw.nist.gov 131.107.1.10 Microsoft, Redmond, Washington
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