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| Newer page: | version 13 | Last edited on Friday, August 24, 2012 4:56:57 pm | by SamBailey | Revert |
| Older page: | version 12 | Last edited on Tuesday, August 21, 2012 7:35:26 pm | by SamBailey | Revert |
@@ -1,13 +1,9 @@
!!! NTP Servers in New Zealand
-
-Have a look at http://www.cosc.canterbury.ac.nz/research/reports/TechReps/1999/tr_9901.pdf for a scientific study (from 1999) of the topology of the country's main NTP servers. (A bit dated as [GPS] is much more widely available now).
-
-!! Stratum 2 Servers
There is a pool of servers at <tt>nz.pool.ntp.org</tt>, which provides [Round Robin DNS|RoundRobin] access to publicly accessible [NTP] servers that have agreed to be part of the pool.
-Many [ISP]s
have NTP servers for their customers:
+Many ISPs
have NTP servers for their customers:
* <tt>ntp.iprolink.co.nz</tt>
* <tt>ntp.iconz.co.nz</tt>
* <tt>tk1.ihug.co.nz to tk3.ihug.co.nz</tt>
@@ -15,35 +11,35 @@
Some universities have publicly accessible servers:
* <tt>ntp.public.otago.ac.nz</tt> (Please notify before using)
-* <tt>ntp.massey.ac.nz</tt> (Use the [DNS] name, as its [IP] changed recently and is now hosted by two machines)
+* <tt>ntp.massey.ac.nz</tt>
For a long time [Waikato University|WaikatoUniversity] had public NTP servers. They are still available but no longer publicly accessible.
!! Stratum 1 Servers
-You shouldn't synchronise to a stratum one server for your small network -- if everyone did that then the server would probably
need too much bandwidth. The difference in accuracy between synching to a stratum 1 server and a lower stratum server is negligible! [more|http://list.waikato.ac.nz/pipermail/nznog/2001-October/003705.html]
+You shouldn't synchronise to a stratum one server for your small network -- if everyone did that then the server would need too much bandwidth. The difference in accuracy between synching to a stratum 1 server and a lower stratum server is negligible! [more|http://list.waikato.ac.nz/pipermail/nznog/2001-October/003705.html]
! .nz Registry Services
There are three stratum 1 NTP servers provided by .nz Registry Services (NZRS) for network operators based within New Zealand. [more|http://ntp.net.nz/]
-* <tt>s1.ntp.net.nz</tt> is
in Albany connected via
FX.
-* <tt>s2.ntp.net.nz</tt> is
in Auckland CBD
connected via
[ICONZ] and directly into
[APE].
-* <tt>s3.ntp.net.nz</tt> is
in Wellington CBD
connected via
FX and directly into
[WIX].
+* <tt>s1.ntp.net.nz</tt> in Albany connected to [
FX]
.
+* <tt>s2.ntp.net.nz</tt> in Auckland connected to
[ICONZ] and [APE].
+* <tt>s3.ntp.net.nz</tt> in Wellington connected to [
FX]
and [WIX].
All three are Symmetricom S300 NTP servers, each connected to a differential GPS antenna on the roof and each with a rubidium oscillator to provide a stable clock in the event of an issue with the GPS signal. [more|http://ntp.net.nz/architecture/]
-! The Measurements
Standards Laboratory
+! The Measurement
Standards Laboratory
-The standard for time in New Zealand is maintained by the Measurement Standards Laboratory, part of Industrial Research Limited. It is disseminated by various means, including
NTP.
+The standard for time in New Zealand is maintained by the [
Measurement Standards Laboratory|http://msl.irl.cri.nz/]
, part of [
Industrial Research Limited|http://irl
.cri.nz/]. MSL runs several public
NTP servers that are referenced to UTC(MSL)
.
* <tt>msltime.irl.cri.nz</tt>
* <tt>msltime1.irl.cri.nz</tt>
* <tt>msltime2.irl.cri.nz</tt>
-They are FreeBSD-based servers that are referenced
to UTC(MSL) by direct connection to a pulse per second signal from
their master HP5071A caesium clock which is part of the New Zealand time standard
. [more|http://msl.irl.cri.nz/services/time-and-frequency/ntp-server-information]
+They are FreeBSD-based servers that are directly connected
to their master HP5071A caesium clock. [more|http://msl.irl.cri.nz/services/time-and-frequency/ntp-server-information]
!!! Servers in other countries
<tt>pool.ntp.org</tt> has NTP server pools for many countries.
@@ -59,9 +55,9 @@
* <tt>nist1-sj.ustiming.org</tt> San Jose, California
* <tt>nist1-la.ustiming.org</tt> Los Angeles, California
* <tt>nist1.aol-ca.symmetricom.com</tt> Mountain View, California
-The US Naval Observatory (USNO) operates several stratum 1 time servers from it's Alternate Master Clock Facility (AMCF) at Falcon AFB
, near Colorado Springs, on the same site as the GPS Master Control Station. These servers are referenced to UTC(USNO) which is comprised of a large number of caesium and hydrogen maser standards in environmentally controlled vaults, spread across two sites linked via satellite
. [more|http://tycho.usno.navy.mil/clocks.html]
+The US Naval Observatory (USNO) operates several stratum 1 time servers from it's Alternate Master Clock Facility (AMCF) at [Schriever Air Force Base|http://en.wikipedia.org/wiki/Schriever_Air_Force_Base]
, [
near Colorado Springs|http://maps.google.com/maps?q=schriever+afb]
, on the same site as the GPS Master Control Station. These servers are referenced to UTC(USNO). [more|http://tycho.usno.navy.mil/clocks.html]
* <tt>tick.usnogps.navy.mil</tt>
* <tt>tock.usnogps.navy.mil</tt>
@@ -95,6 +91,9 @@
!! Digital TV
Freeview transmits local time information using DVB-T at least once every 15 seconds with an accuracy of ±2s.
-----
+!!! More Information
+
+Have a look at http://www.cosc.canterbury.ac.nz/research/reports/TechReps/1999/tr_9901.pdf for a scientific study (from 1999) of the topology of the country's main NTP servers. (A bit dated as [GPS] is much more widely available now).
+
See also [NTPNotes]
