Differences between version 13 and predecessor to the previous major change of NTPServers.
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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 7 | Last edited on Sunday, February 7, 2010 2:11:58 pm | by JimCheetham | Revert |
@@ -1,76 +1,99 @@
-!!! [
NTP]
in NewZealand
+!!! 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)
.
+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
.
-There is a pool of NewZealand servers at <tt>nz.pool.ntp.org</tt>, which provides RoundRobin [DNS] access to publicly accessible [
NTP]
servers that have agreed to be part of the pool.
+Many ISPs have
NTP servers for their customers:
-!!! Stratum 1 [NTP] servers in NewZealand
+* <tt>ntp.iprolink.co.nz</tt>
+* <tt>ntp.iconz.co.nz</tt>
+* <tt>tk1.ihug.co.nz to tk3.ihug.co.nz</tt>
+* <tt>time.paradise.net.nz</tt>
-The Measurements Standards Laboratory at Industrial Reasearch Limited run a HP5071A caesium atomic clock which is part of the New Zealand time standard. This server is available at the address msltime.irl.cri.nz. [Read more details. | http
://msl.irl.cri.nz/services/time-and-frequency/ntp-server-information]
+Some universities have publicly accessible servers
:
-TelstraClear generously provides a stratum 1 [NTP] server for
public use:''''
+* <tt>ntp.
public.otago.ac.nz</tt> (Please notify before using)
+* <tt>ntp.massey.ac.nz</tt>
- <tt>bigben
.clix
.net.nz</tt>
+For a long time [Waikato University|WaikatoUniversity] had public NTP servers
. They are still available but no longer publicly accessible
.
-However, you really 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. Please read http://list.waikato.ac.nz/pipermail/nznog/2001-October/003705.html. The difference in accuracy between synching to a stratum 1 server and a lower stratum server is negligible
!
+!! Stratum 1 Servers
-For example, read
http://www
.cs
.wisc
.edu
/~plonka
/netgear-sntp
/ -- in summary, ~NetGear hard-coded a public [NTP] server into some of their consumer products, which eventually ended up using hundreds of Mbits
/second of the university's bandwidth, even after they were forced to shut down the server
.
+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]
-!!! Other [NTP] Servers
+! .nz Registry Services
-Some NewZealand [ISP]s have
NTP servers for their customers
:
+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>ntp.iprolink.co
.nz</tt>
-* <tt>ntp.iconz.co
.nz</tt>
-* <tt>tk1.ihug.co.nz
to tk3
.ihug.co.nz</tt>
-* <tt>time
.paradise
.net.nz</tt>
+* <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].
-or you could try querying your [ISP]'s [DNS]
servers with <tt>ntp<
/tt> or <tt>ntp1<
/tt>
.
+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/]
-Many of NewZealand's Universities also have public time servers such as:
+! The Measurement Standards Laboratory
-* <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
)
+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 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.
+
+* <tt>au.pool.ntp.org</tt> Australia
+* <tt>us.pool.ntp.org</tt> United States
+
+!! Stratum 1 Servers in the United States
+
+The US National Institute of Standards and Technology
(NIST) operates several publicly accessable stratum 1 time servers on the pacific coast of the US. These servers are referenced to UTC(NIST)
using the NIST Automated Computer Time Service (ACTS
), a modem-based service established in 1988. [more|http://tf.nist.gov/tf-cgi/servers.cgi]
+
+* <tt>nist1
.symmetricom
.com</tt> San Jose, California
+* <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
[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>
+
+Hurricane electric operates several stratum 1 servers with good connectivity on the pacific coast of the US. [more|http://www.he.net/adm/ntp.html]
+
+* <tt>clock.sjc.he.net</tt> San Jose, California (CDMA, Endrun Praecis CNTP)
+* <tt>clock.fmt.he.net</tt> Fremont, California (GPS, Symmetricom NTS-150)
+
+!! Stratum 1 Servers in Australia
+
+The Australian National Measurement Institute (NMI) maintains the Australian time standard, UTC(AUS) using caesium
and hydrogen maser standards. NMI maintains a number of NTP servers which are referenced to UTC(AUS). To use these servers, you need to register via email. [more|http://www.measurement.gov.au/Services/Pages/TimeandFrequencyDisseminationService.aspx]
+
+!!! Other Sources of Time in New Zealand
+
+!! Global Navigation Satellite Systems (GNSS
)
-For a long
time WaikatoUniversity had public [NTP] servers
. They are still available but no longer publicly accessible
.
+GPS
time signals have an accuracy of ±10ns, making them the best option for most applications
. The planned establishment of Galileo by the European Union and Compass by China will provide additional sources of time for compatible receivers
.
-!!!
[NZ
] Pool
+It's possible to sync a computer directly to the Pulse Per Second (PPS) output of a suitable GPS device using a serial or parallel port
[more|http://gpsppssync.sourceforge.net/
]. For better accuracy, there are PCI cards available with PPS inputs and/or built in GPS receivers. There are a variety of dedicated NTP servers available, some with internal oscillators that can maintain a stable clock if the satellite signal is lost.
-Your best bet for
a small home or office
network is to set your server to <tt>nz.pool.ntp.org</tt> or <tt>pool.ntp.org</tt>, which will use RoundRobin [DNS] to choose one
of the many servers now registered with that project
.
+If you require better accuracy than GPS can provide, OmniSTAR provides GPS and GLONASS correction data via
a worldwide
network of geostationary satellites and reference stations
.
-!!! German [NTP] servers
+!! SW Radio
-Germany also has
a pool
.ntp
.org entry
: <tt>de
.pool
.ntp
.org<
/tt>
+It might be possible to receive the 5, 10 and 15 MHz signals broadcast from NIST's WWVH facility in Hawaii. WWVH continuously broadcasts a time code on
a 100-Hz subcarrier
. The time code presents UTC(NIST) information in Binary Coded Decimal (BCD) at a rate of 1 pulse per second
. [more|http
://www
.nist
.gov/pml/div688/grp40/wwv_format.cfm] [wikipedia|http://en.wikipedia
.org/wiki/WWV_(radio_station)#Broadcast_format]
-If that doesn't work for you, you could try some of the following servers:
+!! FM Radio
-* <tt>time1
.rrz
.uni-koeln
.de</tt>
-* <tt>time2
.rrz.uni-koeln.de</tt>
-* <tt>time3.rrz.uni-koeln.de</tt>
-* <tt>ts-1.rz.rwth-aachen.de</tt>
-* <tt>ntp1.t-online.de</tt>
-* <tt>www1.rrz.uni-koeln.de</tt>
-* <tt>hora.cs.tu-berlin.de</tt>
-* <tt>rustime01.rus.uni-stuttgart.de</tt>
-* <tt>rzfs2.rz.tu-bs.de</tt>
-* <tt>ns1.hrz.uni-giessen.de</tt>
-* <tt>ntp2-rz.rrze.uni-erlangen.de</tt>
-* <tt>mailbox.tu-berlin.de</tt>
-* <tt>ntps1-.cs.tu-berlin.de</tt>
-* <tt>ntp0.fau.de</tt>
-* <tt>ntp1.fau.de</tt>
-* <tt>ntp2.fau.de</tt>
-* <tt>ntp3.fau.de</tt>
-* <tt>ptbtime1.ptb.de</tt>
-* <tt>ptbtime2.ptb.de</tt>
+Radio New Zealand broadcasts UTC(MSL) time signals on many of it's stations every hour
. They consist of six 'pips' of 1000 Hz tone, at one second intervals, the beginning of each pip marking the exact second
. When a pip marks the exact hour, its length is doubled
. When a leap second is inserted seven pips are broadcast
.
-You might also want to look at a [very extensive list of public German NTP servers | http://www.hullen.de/helmut/filebox/DCF77/ntpsrvr.html].
+!! Digital TV
-!!! Other non
-[NZ] servers
+Freeview transmits local time information using DVB
-T at least once every 15 seconds with an accuracy of ±2s.
-As mentioned above, <tt>pool.ntp.org</tt> is a RoundRobin [DNS] for many [NTP] servers. Try <tt>''cc''.pool.ntp.org</tt>, where ''cc'' is a country code.
+!!! More Information
-* [Public NTP server lists
at ntp.org |
http://support
.ntp
.org
/bin
/view
/Servers
/WebHome
]
+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]
