Gps ntp appliance


SR Series GPS \ LF Radio NTP Time Servers

Synchronize your network with microsecond precision using Network Time Protocol (NTP \ SNTP).

Accurately synchronize Windows, Linux, Unix, Servers and Workstations, Time Displays, CCTV systems, DVR’s, telephone systems, switches, routers and more!

GPS, MSF and DCF-77 reference clock options for Stratum 1 operation. Peering and Stratum 2 operation via NTP servers.

 

PLEASE NOTE: TimeTools SR Series has now been superseded by the T300 GPS NTP Server Appliance and T550 GPS/GLONASS/BeiDou/Galileo NTP Server.

 

Key Features

  • Competitively Priced, True Stratum 1 NTP Time Servers
  • Single and Dual Independent LAN options
  • GPS, Radio and Dual Reference Clock Options
  • High Stability TCXO Options for Extended Holdover

Key Benefits

  • Accurately Synchronize Windows, Linux and UNIX Clients
  • Accurate, Reliable, Source of Time Inside Your Firewall
  • Serves Thousands of Network Time Clients
  • Accurately Synchronize Time Critical Processes

Overview

TimeTools SR Series provides a complete range of Linux-based, true Stratum-1, NTP Network Time Servers that represent a real breakthrough in price and performance.

Housed in a rugged, yet compact, 1U high, rack-mountable enclosure, the SR series takes up minimal valuable rack-space.

By utilising a customized Linux kernel and an unmodified version of the latest network time protocol distribution, NTP version 4.2, the SR series offers true NTP / SNTP functionality.

GPS, Radio and Dual Reference Clock Options

Multiple external reference clock combinations can be provided with the SR series; GPS, MSF radio, DCF-77 radio and dual GPS / radio reference capabilities. The SR series provides true flexibility.

The SR series is also provided with a cutting-edge high-sensitivity GPS receiver that can often operate with an indoor located GPS antenna. Additionally, the new receivers can operate from a single satellite-in-view making operation from a window often possible. These features potentially provide a great saving on installation costs when compared to traditional roof-mounted GPS antennas.

Of course, our GPS antennas are completely weatherproof and can be roof-mounted outdoors, if required.

 

High Stability Extended Holdover OptionHigh-stability GPS/LF disciplined Temperature Controlled Crystal Oscillator (TCXO) options are available to maintain accurate time for extended periods in the event of GPS / radio reference clock signal loss.

Secure Configuration and MaintenanceA secure (HTTPS), easy to use, password-protected user interface is provided for system configuration and management. FTP/SCP can be utilised to download NTP statistics and upload firmware upgrades, available from TimeTools free of charge.

5-Year WarrantyThe SR Series NTP Server is a low-power convection cooled device with no moving parts, aiding long-term reliability. Our confidence in the reliability of the device is reflected in the provision of an industry leading 5-year warranty.

Customer TestimonialsJust installed our first SR9210. We were quite surprised about the craftsmanship and quality of the product. The software seems to be engineered very well too. We were able to complete the set-up within a time frame of one hour from first power on to full configuration – and we wrote the documentation for our configuration in parallel. We are using GPS, DCF-77 and three ntp.org pools for fail-over reasons. Did some fail-over tests too – everything worked as expected. If anyone asks me for advice on a ntp time server, my answer will be: go to TimeTools and place your order. Thank You very much.Matthias Petz, ICT Systems Engineer and Project ManagerStrüby Konzept AG, Sweden

See more customer testimonials.See more customer references.

SR7110 – Entry Level, Competitive PriceThe SR7110 is an entry-level Linux-based true NTP time server at a highly competitive price. It can utilise GPS or LF radio time references to provide stratum-1 NTP functionality, ideal for synchronizing digital clocks, DVR’s and smaller networks.

SR9210 – Feature Rich, ValueThe mid-range SR9210 provides a high specification NTP network time reference. It incorporates a high-throughput Ethernet network interface, combined with the ability to accept GPS, LF radio or dual GPS / LF radio external time references. The SR9210 is an ideal time reference where a large number of network time clients are to be synchronized accurately and reliably.

SR9750 – High Stability, Extended HoldoverThe SR9750 provides all the features of the SR9210 with the additional benefit of a high-stability disciplined TCXO oscillator for extended holdover in the event of primary reference loss. Ideal where a highly reliable source of time is required.

SR9860D – Dual LAN, High AccuracyThe top-of-range SR9860D incorporates dual independent LAN capability for synchronizing multiple networks. It also provides enhanced precision along with a GPS/LF disciplined TCXO for extended holdover. Ideal for reliably synchronizing multiple, large, networks with a high degree of accuracy.

Model Comparison Chart

Model

SR7110

SR9210

SR9750

SR9860D 

Network
   LAN 10/100 Mbit BaseT , RJ45 auto-sensing

Single

Single

Single

Dual
Timing Protocols
   NTP v2, v3, v4, SNTP v3, v4

 ●
   NTP Peering

 ●
   NTP Broadcast

 ●
   NTP MD5 Authentication

 ●
   NTP Requests / Second (typical)

> 200

> 1000

> 1000

 >5000
   Maximum Number of NTP Clients (typical)

>12,000

> 64,000

> 64,000

 >320,000
   NMEA RS232 Output

 ●
Time Reference Options
   12 Channel GPS Receiver High SensitivityIndoor, Over- Determined Clock,Single Satellite Operation

 ●
   LF – MSF (UK) Reference Clock

 ●
   LF – DCF-77 (German) Reference Clock

 ●
   Dual GPS and LF Radio Reference Clocks

 ●
Monitoring and Reporting
   SNMP v1 / v2c Trap Alarms(Can be disabled)

 ●
   System Logging (SysLog)

 ●
   Remote System Logging (Remote Syslog)

 ●
   GPS Satellites in View &Signal to Noise Ratio (SNR)

 ●
Configuration Protocols
   HTTP (Web) / HTTPS(SSL Secure Sockets Layer)

 ●
   SSH (Secure Shell), SCP(Secure Copy Protocol)

 ●
   TELNET, FTP

 ●
   Console (RS232)

 ●
   DHCP

 ●
Oscillator Options
   Standard Crystal Oscillator

   High Stability GPS\LF DisciplinedTCXO Oscillator

 ●
Timing (Typical)
   GPS Accuracy

1 ms

60 ns

60 ns

 60 ns
   LF Accuracy

10-50 ms

1-20 ms

1-20 ms

 1-20 ms
   NTP Accuracy (typical, GPS Synchronized)

<10 ms

< 250 us

< 250 us

 <1 us
   24 Hour Holdover (GPS disciplined, typical @ 25C)

<±10 ms(2.3e10-7)

 <±4.3ms(1e10-7)
   Buffered 1 PPS Output on BNC

 ●

Mechanical\Environmental Specification

Dimensions 483 x 205 x 44 mm (19.0″ x 8.05″ x 1.73″)
Construction 1U High 19″ Rack mount, 1.8mm Aluminium
Weight approx 2.2Kg (4.84lbs)
Power Supply Universal 100-250 VAC 50- Hz CE/UL/CSA Approved PSU(Optional 9-36V DC IN and 85-250V DC IN versions available)
Power Consumption approx 5W
OperatingTemperature 0C ~ +50C (Extended temperature range options available)
Storage Temperature -10C ~ +60C (Extended temperature range options available)
Relative Humidity 95% non-condensing
Approvals CE, EN61000-6-1, EN61000-6-3

Input\Output Specification

LAN 10/100 Mbit BaseT , RJ45 auto-sensing
Serial Console 9 way ‘D’ RS232, 9600, N, 8, 1
GPS Input TNC female
LF/AUX Input: 9 way ‘D’
Power Double Fused IEC Inlet
PPS (optional) Buffered pulse per second output on BNC (optional)

Integral GPS Receiver Specification

Type True GPS Timing Receiver, 12 Channel, L1 1575.42 MHz
Features High sensitivity, Over-determined clock modes, Single satellite in view
Timing GPS Time Traceable to UTC (USNO)
Accuracy +/- 60 nsec UTC (typical)
Acquisition(Cold Start) 38 sec

SR Series NTP Time Servers Product Codes

SR 7110 GPS \ LF NTP Server SR7110-20P
SR 9210 GPS \ LF \ Dual Reference NTP Server SR9210-20P
SR 9750 GPS \ LF \ Dual Reference NTP Server with TCXO SR9750-20P
SR 9860D GPS \ LF \ Dual Reference NTP Server with TCXO SR9860D-20P
Scope of Supply: SR Series NTP Time Server, IEC Mains Lead,Console Configuration Cable, Product User Guide and NTP Client CD.

(Optional 9-36VDC IN, 85-250VDC IN and extended temperature range versions available.)

Optional SR Series GPS Reference Clock Antennas and Accessories

Jam-Resistant Pole Mounting GPS Antenna and Mount T-3072
30m RG58 Cable TCX-030
50m LMR195 Cable TCX-050
100m LMR400 Cable TCX-100
Additional cable lengths available on request
GPS Surge Suppressor SPP-GPS
GPS Amplifier – 20db T-AD200-8
LF / GPS over optical fibre systems P.O.A
GPS Splitters – 2 to 32 way, compact or rack-mount P.O.A

Optional SR Series LF (Radio) Reference Clock Antennas

Ultra-High-Gain MSF (UK) Antenna SR-MXS-00
Ultra-High-Gain DCF-77 (German) Antenna SR-DXS-00
LF Radio Surge Suppressor LF-SPP

 

How To Buy

TimeTools sells directly to you!

Typically, our products are available from stock and can be dispatched to locations world-wide.

You can purchase any of our products by contacting us directly for a quotation, advice or to set up an account.

Additionally, we accept most credit cards, including Visa and MasterCard.

Alternatively, please contact one of our approved representatives in your region.

About Us

TimeTools is a leading manufacturer of precise time references for synchronizing servers, workstations and computer network infrastructure. For well over a decade, TimeTools has been providing timing solutions to high-profile companies world-wide. Here is a small selection of companies who trust TimeTools for their timing requirements:

See more customer references.See more customer testimonials.

Quality: ISO9001

TimeTools is an ISO9001:2008 accredited company. ISO9001 accreditation demonstrates that quality assurance and customer satisfaction is of paramount importance to us.

We are also a member of the CE Marking Association, which enables us to meet our legal obligations with regards to the CE Mark and product conformity, and with keeping up-to-date with changes in legislation.

timetoolsltd.com

Enterprise-Class GPS NTP Time Server Appliance

Datasheets

GPS Timing Accessories

More Info

Spectracom GPS timing accessories include GPS antennas, surge protectors, grounding kits, amplfiers, splitters, software, time displays, and support package options.

pdf - 140 KBSaturday, November 16, 2013By: Spectracom
Option Module Cards for SecureSync Datasheet

More Info

Optional hardware modules for the SecureSync platform.

pdf - 165 KBWednesday, March 15, 2017By: Spectracom
SecureSync BroadShield Option

More Info

BroadShield is an option that integrates over 75 GPS jamming and spoofing detection algorithms into the SecureSync Precision Time and Frequency Platform.

pdf - 14 MBFriday, September 8, 2017
SecureSync Enterprise-class datasheet

More Info

A SecureSync configuration and options for the needs for enterprise network synchronization.

pdf - 685 KBWednesday, March 15, 2017By: Spectracom
Spectracom Time Server/ Master Clock Web UI Overview

More Info

An overview of the web-based graphical user interface for Spectracom's time server/master clock platform.

pdf - 123 KBWednesday, April 8, 2015By: Spectracom

Technical Notes and Briefs

Email Notification Setup for SecureSync and NetClock 9400

More Info

This document is designed to help with the configuration Email Alerts to generate automatic emails when certain events occur on a SecureSync, NetClock, or VersaSync Time Server with 5.1.x software or higher.

pdf - 266 KBTuesday, November 15, 2016By: Spectracom
Differences Between NTP and SNTP

More Info

NTP (Network Time Protocol) and SNTP (Simple Network Time Protocol) are very similar TCP/IP protocols in that they use the same time packet from a Time Server message to compute accurate time. The procedure used by the Time Server to assemble and send out a time stamp is exactly the same whether NTP (i.e. full implementation NTP) is being used, or if SNTP is being used.

pdf - 103 KBTuesday, November 1, 2011By: Spectracom
NTP over Anycast

More Info

Spectracom NTP services, implemented in its SecureSync and NetClock 9400 platforms, are compatible with an Anycast routing scheme. The NTP over Anycast feature is a combination of the time server’s ability to associate one of its network ports to an Anycast IP address and to remove itself as an available time source if there is a problem with its reference.

pdf - 170 KBThursday, September 25, 2014By: Spectracom
NTP Server Capacity Testing

More Info

Large-scale NTP deployments require consideration for the network’s time synchronization architecture. Network time deployments are usually driven by considerations for reliability, scalability, manageability and security. The capability of modern NTP servers, such as Spectracom SecureSync® and NetClock® time servers, is such that capacity does not impact the design of the synchronization architecture. 

pdf - 343 KBThursday, May 19, 2016By: Spectracom
Routing of Data Across Multiple Networks

More Info

This technical note provides a general description of the software routing scheme of a single Spectracom unit with multiple network ports and offers alternative timing hardware deployments if software isolation is insufficient.

pdf - 319 KBMonday, December 22, 2014By: Spectracom

Compliance Documents, Technical Notes and Briefs

NERC CIP-007 Security Report

More Info

This technical note documents the compatibility of SecureSync with the North American Electric Reliability Corporation’s (NERC) Critical Infrastructure Protection (CIP) “CIP-007 Standard Cyber Security – Systems Security Management” and describes the SecureSync configuration settings required to meet the CIP-007 requirement.

pdf - 142 KBTuesday, November 15, 2011By: Spectracom

White Papers

GNSS Enhances Timing Applications

More Info

Typically, applications for timing use GPS as a precise, traceable, high availability, and free source of synchronization. But GPS is not the only satellite in the sky. More and more Global Navigation Satellite Systems (GNSS) are being developed and deployed. This white paper describes the trend to multi-GNSS using the example of the Russian GLONASS system as a complement to GPS.

pdf - 363 KBTuesday, November 19, 2013By: Spectracom
Leap Second Readiness Tips

More Info

If you manage a time-sensitive network, you'll want to consider how a leap second event will effect your applications. We offer these tips to help you be prepared. pdf - 356 KBFriday, September 9, 2016By: Spectracom

spectracom.com

NTP Server Appliances | GPS Radio Signal

NTP Appliance SR Series

TimeTools SR Series provides a complete range of Linux based, true Stratum-1, NTP Network Time Servers that represent a real breakthrough in price and performance.

Housed in a rugged, compact, 1U, rack-mountable enclosure, the SR series takes up minimal valuable rack-space.

By utilising a customized Linux kernel and an unmodified version of the latest network time protocol distribution, NTP version 4.2, the SR series offers true NTP / SNTP functionality.

GPS, Radio and Dual Reference Clock OptionsMultiple external reference clock combinations can be provided with the SR series; GPS, MSF radio, DCF-77 radio and dual GPS / radio reference capabilities. The SR series provides true flexibility.

The SR series is also provided with a cutting-edge high-sensitivity GPS receiver that can often operate with an indoor located GPS antenna. Additionally, the new receivers can operate from a single satellite-in-view making operation from a window often possible. These features potentially provide a great saving on installation costs when compared to traditional roof-mounted GPS antennas. Of course, our GPS antennas are completely weatherproof and can be roof-mounted outdoors.

High Stability Extended Holdover OptionHigh-stability GPS/LF disciplined Temperature Controlled Crystal Oscillator (TCXO) options are available to maintain accurate time for extended periods in the event of GPS / radio reference clock signal loss.

Secure Configuration and MaintenanceA secure (HTTPS), easy to use, password-protected user interface is provided for system configuration and management. FTP/SCP can be utilised to download NTP statistics and upload firmware upgrades, available from TimeTools free of charge.

5-Year WarrantyThe SR Series NTP Server is a low-power convection cooled device with no moving parts, aiding long-term reliability. Our confidence in the reliability of the device is reflected in the provision of an industry leading 5-year warranty.

SR7110 – Entry Level, Competitive PriceThe SR7110 is an entry-level Linux based true NTP time server at a highly competitive price. It can utilise GPS or LF radio time references to provide stratum-1 NTP functionality, ideal for synchronising digital clocks, DVR’s and smaller networks.

SR9210 – Feature Rich, ValueThe mid-range SR9210 provides a high specification NTP network time reference. It incorporates a high-throughput Ethernet network interface, combined with the ability to accept GPS, LF radio or dual GPS / LF radio external time references. The SR9210 is an ideal time reference where a large number of network time clients are to be synchronised accurately and reliably.

SR9750 – High Stability, Extended HoldoverThe SR9750 provides all the features of the SR9210 with the additional benefit of a high-stability disciplined TCXO oscillator for extended holdover in the event of primary reference loss. Ideal where a highly reliable source of time is required.

SR9860D – Dual LAN, High AccuracyThe top-of-range SR9860D incorporates dual independent LAN capability for synchronising multiple networks. It also provides enhanced precision along with a GPS/LF disciplined TCXO for extended holdover. Ideal for reliably synchronising multiple, large, networks with a high degree of accuracy.

NTP Appliance SC Series

TimeTools new SC Series NTP servers are a range of Linux based true Stratum 1 NTP Network Time Servers that provide a real breakthrough in price and performance.

Housed in a rugged, yet compact, aluminium desktop enclosure the SC series takes up minimal valuable space.

By utilising a customized Linux kernel and an unmodified version of the latest network time protocol distribution, NTP version 4.2, the SR/SC series offers true NTP/SNTP functionality.

The SR/SC series is now provided with a cutting-edge high-sensitivity GPS receiver that can often operate with an indoor located GPS antenna. Additionally, the new receivers can operate from a single satellite-in-view making operation from a window often possible. These features potentially provide a great saving on installation costs when compared to traditional roof-mounted GPS antennas. Of course, our GPS antennas are completely weather-proof and can still be roof-mounted, if required.

MULTIPLE REFERENCE CLOCK OPTIONS

Multiple optional external reference clock combinations can be provided with the SR and SC series; GPS, MSF radio, DCF-77 radio and dual GPS / radio reference capabilities. They provide true flexibility along with high stability and performance.

High-stability disciplined TCXO oscillator options are available to maintain accurate time for extended periods in the event of GPS / radio reference clock signal loss.

EASY TO CONFIGURE AND MAINTAIN

An easy to use password-protected web interface is provided for system configuration and management. FTP can be utilised to download NTP statistics and upload firmware upgrades, provided by TimeTools free of charge.

INDUSTRY LEADING 5-YEAR WARRANTY

The SC Series NTP Servers are low-power, convection cooled, devices with no moving parts, aiding long-term reliability. Our confidence in the reliability of the SC range of devices is reflected in the provision of an industry leading 5-year warranty.

MODELS

SC7105 – LF / GPS REFERENCED

The SC7105 is an entry-level Linux based true NTP time server at a highly competitive price. They can utilise GPS or LF radio time references to provide stratum 1 NTP functionality, ideal for synchronising digital wall clocks and smaller networks.

SC9205 – LF / GPS / DUAL REFERENCED

The mid-range SC9205 model provides a high specification NTP network time reference. It incorporates a high-throughput Ethernet network interface, combined with the ability to accept GPS, LF radio or dual reference GPS / LF radio external time references. The SC9205 are ideal time reference where a large number of network time clients are to be synchronised accurately and reliably.

SC9705 – LF / GPS / DUAL REFERENCED WITH TCXO

The top-of-range SC9705 has all of the advanced features of the SC9205 but also incorporates a high-stability GPS disciplined Temperature Controlled Crystal Oscillator (TCXO). The high precision TCXO backup reference clock provides extended holdover periods in the event of primary reference signal loss.

www.callevanetworks.com

Gps ntp server appliance Free Download for Windows

2  Galleon Systems  219  Freeware

NTP Tool is a test tool that acts as a client to a NTP server.

 Intel® Hybrid Cloud Server Manager  5  Freeware

It allows the management of the appliances installed on the servers.

1  Plaska GPS Service, Inc.  14  Demo

It will collect corrections sent by a GNSS base station and act as a gateway.

 ntp time server

GPS Clock for PC time sync to NMEA GPS time receiver. GPS Atomic clock sync.

 IZ2BKT - Capelli Mauro  22  Freeware

BktTimeSync adjust the time on your PC using an Internet time server.

1  blue-series  144  Freeware

Time Watch synchronize the system time with a NTP-server over the Internet.

1  TimeTools  40  Freeware

TimeTools provides highly accurate GPS NTP Server and atomic clock timing system.

 Thomas Wenzlaff

Syncronised Windows System time with NTP Server and verifed NTP Server list.

 Bluefive software  38  Freeware

InTime you can synchronize your system time with an NTP server on the internet.

3  One Guy Coding  52  Freeware

SNTP client to synchronize your computers time with a NTP server.

 EmTec Innovative Software  40  Shareware

This NTP client synchronizes your PC clock with an internet atomic time server.

 Digidesign, A Division of Avid Technology, Inc.  33  Freeware

DigiDelivery is a network appliance similar to a server.

 Voyager Project  5  Freeware

UPnP media server is a computer system or a similar digital appliance.

7  Franson Technology  1,193  Shareware

GpsGate Server is a leading software platform for web based GPS tracking.

 Digital Matter Embedded  254  Freeware

It forms the connection between the device and the GPS Log Book server.

 SAP AG  7  Shareware

GpsGate Server is a web-based GPS tracking platform.

softwaretopic.informer.com

GPS NTP Network Time Server Appliances

GPS is increasingly becoming the standard time reference for the synchronization of computers and computer networks. The system itself is an US military satellite system, primarily intended for global positioning and navigation. The system consists of a constellation of 24 orbiting satellites, each carefully positioned to provide global signal coverage. Each satellite has an on-board atomic clock, and continually broadcasts a weak radio signal to the surface of the Earth containing highly precise timing information. This information can be used for timing applications as well as the more normal location detection and navigation.

TimeTools SR Series GPS NTP Server

 

A GPS-reference NTP server has a number of fundamental advantages over other precise sources of time. The primary advantage is that GPS signals can be received anywhere in the world. Unlike radio broadcasts, such as MSF, DCF-77 and WWVB – it is not limited by transmission range or national boundaries. Additionally, the same equipment can be utilized in any location. Whereas national radio time signals vary in frequency and data format so that different receiving equipment and software is required to receive signals in different localities. GPS also has an unsurpassed, very high, degree of precision.

Traditionally, GPS antennas required line-of-sight view of the sky in order to obtain a consistent signal lock. Ideally, they would be located on a rooftop with an all-round view of the sky. However, modern timing receivers can operate down to a single satellite in view, rather than the traditional four. This allows receivers to maintain a signal lock with a much-reduced view of the sky – maybe from a windowsill location.Modern receivers are also becoming much more sensitive and can often operate with antennas located indoor, with no line-of-sight view to the sky. This feature can often provide a substantial cost saving over traditional receivers, since the expense of cabling and installation of an antenna on a rooftop is often unnecessary.

A GPS time server generally contains a GPS receiver enclosed within the unit. A TNC or BNC type coax connector is often used to connect the device to an antenna using RG58 or similar 50-ohm coax cable. The antenna is powered from the time server, so that no additional power outlet is required at the antenna location.

If the antenna is located outdoors, it is generally accepted that some form of surge suppression be used. A surge suppressor protects the base unit and attached network from voltage surges generated by potential lightning strikes. They generally take the form of either small gas-filled barrier devices or solid-state electronic surge diverting devices. The suppressor generally sits in-line on the coax cable and is located where the cable enters the building.

For very long cable runs between an antenna and base unit, an amplifier can be used to boost signals to overcome cable losses. Alternatively, a media converter can be used, such as an optical fibre converter, to transmit signals over extremely long distances, even kilometres.

The NTP server appliance will use the GPS signals to synchronise and calibrate it’s internal time. Typically, they can synchronise to within a few microseconds of the correct time. The server will provide an indication of signal lock as well as the number of satellites in use at any one time along with the signal to noise ratio (SNR) of communication with each satellite. This information is very useful for debugging and proving antenna location suitability.

Future Developments

Galileo is the name given to the civilian global navigation satellite system (GNSS) being constructed by the European Union. Galileo aims to provide a reliable GNSS system on which the European nations can rely and which is independent of other similar systems.

The system will be based around a constellation of 30 orbiting satellites, 27 will be operational at any given time and 3 will be used as spares. The service will provide both horizontal and vertical positioning information to a precision of 1 metre. Basic, low-precision, positioning services will be free-to-air, while a higher-precision service will be available for commercial organisations, which will require a subscription fee.

The first two satellites were launched in October 2011, followed by a further two in October 2012. The initial four-satellite system allows system testing to be carried out while the other satellites are being constructed and launched. It is hoped that a complete system of 30 satellites will be operational by 2019.

The Galileo GNSS system should provide an additional source of precise time which will be available globally and can be received without charge. It will provide an alternative source of time for applications whose reliance on the current US military service is sensitive.

Summary

To summarize, GPS is currently the preferred means of providing computer networks time synchronization. They can operate anywhere in the world and provide a highly accurate time resource for computer networks and other timing applications. Galileo will provide an additional source of precise time based on a civil rather than military service.

 

About the Author.Andy Shinton has spent his entire career within the IT industry, mainly in the Time and Frequency sector. Since 2002, he has headed TimeTools Research and Development Division. Andy regularly writes white-papers and articles about NTP and Network Timing Solutions.

 

www.timetoolsglobal.com

Installing a NTP Time Server

NTP is an abbreviation of Network Time Protocol, which is a standard internet protocol that was established over twenty years ago. NTP time servers are network appliances that are designed to disseminate accurate time to client computers and network infrastructure for synchronization purposes.

This article provides a brief overview on a number of topics associated with the installation and configuration of a NTP time server appliance:

  • NTP Server Hardware Installation.
  • NTP Appliance Configuration.
  • Hardware Reference Clock options, GPS, MSF, DCF-77 and WWVB.
  • NTP Security and Authentication.
  • Client Configuration.
  • Simple Network Time Protocol (SNTP)

 

NTP time servers are generally network appliances provided in desktop or rack-mountable enclosure. They are intended to be housed in a typical computer room with other servers. The appliances are designed to obtain very accurate time from a hardware reference clock, such as GPS or one of the many national radio time broadcasts available. They use this accurate time to synchronize an internal clock and in turn provide accurate time to other networked devices. Network Time Protocol is designed to operate on a typical TCP/IP network using the UDP datagram protocol.

NTP Time Server Hardware Installation

Stratum 1 NTP server systems rely on an external timing reference to obtain accurate time. Various external timing references are available. Options may vary with according to the regional location of the installation.

The Global Positioning System – GPS

GPS has a number of advantages over national radio hardware clock references:

  • It is highly accurate, to within less than a microsecond of UTC.
  • GPS is a satellite based system that is available world-wide.
  • It provides a continuously available signal, 365 days of the year.
  • It is not affected by local topology. All that is required is that an antenna is provided with a good view of the sky.

GPS also has a couple of disadvantages, but these are generally far outweighed by the advantages discussed above:

  • A roof mounted antenna is generally required to obtain a good GPS lock, increasing installation costs.
  • It is considered good practice to install a surge suppressor to any externally mounted antenna. This provides protection against potential lightning strikes and other voltage surges.
  • Installers need to be aware of coax cable types for antenna installations, lower-loss cable is required for longer cable runs.

National Radio Time Broadcasts

Radio time broadcasts are available in many countries. These broadcasts have a finite range and are therefore regional, generally limited to national boundaries. Radio signals can often be received indoors and so require less effort and expense to install. However, the signals can be prone to local interference and also metal structures which reflect and block the radio signals. Also, radio time broadcasts are not as accurate as GPS. Typically, synchronization to with a few milliseconds is achievable rather than microseconds with GPS. Additionally, many radio transmissions are also prone to going off-air for days or even weeks at a time for maintenance and repairs. To summarise, a number of factors can affect radio reception:

  • Locating an antenna underground or in a basement.
  • Placing the antenna inside a metal cage or enclosure, including metal clad buildings.
  • Locating the antenna too close to electrically noisy equipment.

A number of national radio time broadcasts are available including:

  • MSF-60, transmitted at 60 KHz from Anthorne, UK and is available throughout the British Isles and much of North-Western Europe.
  • DCF-77, transmitted at 77.5 KHz from Frankfurt, Germany and is available throughout much of Central and Western Europe.
  • WWVB, transmitted at 60 KHz from Colorado, USA and is available throughout much of the United States and Canada.

NTP Server Configuration

NTP time servers are very easy to configure and install. There are a large number of options available to configure a NTP daemon, but for all but a very few applications, the default configuration is more than adequate. It is, however, good practice to assign a static IP address to a NTP server rather than a leased DHCP assigned address. Once configured, the appliance then needs to synchronize with the selected hardware time reference before it can provide time to clients. This process is a calibration process which can take up to 20 minutes to complete.

NTP Security and Authentication

An option that many organisation prefer to have is NTP authentication, which is a means of secure communication between a client and NTP server. NTP implements MD5 authentication which allows timestamps to be securely transmitted between a server and client and prevent any possibility of tampering.

NTP Client Configuration

Most modern operating systems have built-in NTP or SNTP clients which can easily be configured to synchronize to a NTP server. All recent Microsoft Windows operating systems along with UNIX, LINUX and Novell all have clients available. A minimum client install and configuration requires only the IP address of the server to which it is to synchronize.

As well as servers and workstations, many network appliances can also accept time from a NTP server. Appliances such as routers, switches, IP cameras, Digital Video Recorders (DVR’s) can all be synchronized.

Simple Network Time Protocol (SNTP)

Simple Network Time Protocol (SNTP) is a simplified version of NTP that lacks some of the intricacies of the full-blown protocol. It is quite often used by workstations and small computers that do not require the precision offered by the full-blown NTP protocol. However, both the NTP and SNTP protocols are completely interchangeable, any SNTP client can obtain time from a NTP server.

Summary

NTP time servers are network appliance designed for the purpose of time synchronization of networked devices. They are extremely easy to install, configure and maintain. GPS is generally accepted as the preferred choice of hardware clock, though national radio broadcasts are also an option. Client configuration often consists of only specifying an IP address of a time server.

 

 

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T300 1U Rack-Mountable GPS NTP Server

Unit Price: GBP 850.00 \ EUR 995.00 \ USD 1150.00

Price Includes: T300 GPS NTP Server Appliance, GPS Timing Antenna, Antenna Mount, 30m Cable, 6-Year Warranty.

All prices Ex-Works.

TimeTools T300 time server is a cost-effective, accurate, Stratum-1 GPS referenced Network Time Protocol Server in a 1U rack-mountable enclosure.

It provides an accurate time reference to computer networks and can accurately synchronize any NTP or SNTP compatible system.

Highlights

  • NTPv4 Stratum-1 GPS Network Time Server.
  • GPS accurate to 15 nanoseconds (GPS Locked).
  • NTP accurate to 3 microseconds (GPS Locked).
  • Synchronize in excess of 100,000 clients at default NTP polling frequency.
  • 10/100 Mbit auto-sensing, auto-MDIX Ethernet port.
  • IPv4 and IPv6 Internet Protocols.
  • Extremely cost-effective.
  • Integrated universal AC mains input PSU.
  • Made in UK, with 6-year warranty and free lifetime support.

Applications

Network timing, measurement and synchronization.Synchronize Microsoft Windows, Linux, servers, workstations and network infrastructure.Automation Systems, SCADA, Network Monitoring and Control Systems.CCTV, DVR and Video Management Systems (VMS).Access Control Systems (ACS).Master clock for NTP synchronized clock systems.Accurately synchronize time critical processes to a traceable source of time inside your firewall.

Customer References and Testimonials

A large number of prestigious organisations from around the world trust TimeTools for their synchronization requirements. Here is a small selection:

Rolls Royce, Lockheed Martin, Shell, Siemens, Nokia, NASA, Bank of England, BAe Systems, British Telecom, Motorola, Coca-Cola, BBC, Inland Revenue, US Army Corps. See more customer references.

Just installed our first TimeTools NTP Server. We were quite surprised about the craftsmanship and quality of the product. The software seems to be engineered very well too. We were able to complete the set-up within a time frame of one hour from first power on to full configuration – and we wrote the documentation for our configuration in parallel. We are using GPS and three ntp.org pools for fail-over reasons. Did some fail-over tests too – everything worked as expected. If anyone asks me for advice on a NTP time server, my answer will be: go to TimeTools and place your order. Thank You very much.Matthias Petz, ICT Systems Engineer and Project ManagerStrüby Konzept AG, Sweden

Product Codes

T300-00 GPS NTP Server appliance.

Scope of Supply – What is Included

T300           GPS NTP Server Appliance.

T-3040       Pole Mounting GPS Antenna .MT4-GPS   Antenna Mount.TCX-030    30m (100 ft) RG58 Cable.

IEC Power Lead.RS232 Serial Console Cable.Quick Start Guide.CD containing user-guide, installation guide and white-papers.

Optional Accessories

TCX-010      10m RG58 Cable.TCX-050      50m LMR195 Equivalent Cable.TCX-100      100m LMR400 Equivalent Cable.

Custom cable lengths available on request.

SPP-GPS     Multi-strike maintenance-free surge suppressorT-AD200-8 GPS Amplifier – 20db

Download

 T300 Datasheet Quick Start T1201-01 T300 T550 Hardware Guide T1202-01 Antenna Installation Guide T1300-01 T-Series User Guide

 

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