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About NTP/SNTP and Internet Time Servers
The Network Time Protocol (NTP) synchronizes the system time on a computer to that of
an Internet Time Server that has been synchronized to a reference source, such as radio,
Global Positioning Service (GPS) receiver that provides Coordinated Universal Time
(UTC). Communication with the Internet Time Server is maintained either by a dialup
modem or direct LAN connection.
The Simple Network Time Protocol (SNTP) is a basic version of NTP that allows for a
greater degree of error, but can still deliver time to an accuracy on the order of fractions of
a second.
SNTP on switch platforms that support direct synchronization
The following Avaya switch platforms can use SNTP software on the platform operating
system to directly synchronize the switch clock to UTC time that is obtained from an
Internet Time Server:
Avaya IP600
DEFINITY One
Avaya S8000 Media Server
Avaya S8300 Media Server
Avaya S8700 Media Server
The platforms listed above include either Red Hat Linux or Windows 2000 as the platform
operating system. The following recommendations and conditions are in effect for SNTP
configuration on these systems:
For Linux platforms, Avaya recommends that the IP addresses for at least three different
Internet Time Servers be configured. The following web site provides a list of time
servers:
For Linux platforms, go to the following web sites for information about how to obtain
NTP/SNTP software:
Linux platforms support the authentication/encryption mode provided in NTP/SNTP
version 3 or later support. This capability is not enabled by default.
Windows 2000 platforms can use only one SNTP client (W32Time), which limits UTC
polling to one Internet Time Server IP address at a time. For more information, see the
Microsoft Windows 2000 documentation. Search for the keywords "Window Time
Service."
http://www.eecis.udel.edu/~mills/ntp/servers.htm
http://www.ubr.com/clocks/timesw/timesw.html
http://www.ntp.org/software/index.html
About NTP/SNTP and Internet Time Servers
Issue 1.0 May 2003
365
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