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Time & Frequency References & Systems
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SecureSync Time & Frequency Reference System


Modular Time & Frequency Reference System

  • Flexible
  • Configurable
  • Resilient
  • Value

The SecureSync is built on a platform of configurable capability components, either by hardware, software or system integration, to offer precisely what you need with the lowest cost of ownership. The solution you need at the time you need it.

 Spectracom SecureSync

SecureSync® combines Spectracom’s precision master clock technology and secure network-centric approach with a compact modular hardware design to bring you a powerful time & frequency reference system at the lowest cost of ownership. Military and commercial applications alike will benefit from its extreme reliability, security, and flexibility for synchronizing critical operations.

  • Synchronize to GPS, SAASM GPS, multi-GNSS and many other timing references
  • Generate virtually any time and frequency output signals
  • Choose from a variety of internal oscillator options
  • Built-in high-performance NTP server; PTP options
  • STL Option - add STL to GPS or GNSS input references to improve resilience, or use STL alone for indoor applications.
  • Modular (configure-to-order) ruggedized shock and vibration-tested chassis (1RU)
  • Exceptional operating temperature range of -20°C to +65°C
  • Secure network management and control
  • Platform approach allows easy integration of specific capabilities



NTP Server Overview

SecureSync® combines Spectracom’s precision GPS master clock technology and secure network-centric approach with a compact modular hardware design in a 1RU chassis to result in a powerful, scalable and flexible NTP appliance.

Spectracom SecureSync back panel with cards

Supporting a wide variety of network synchronization and management protocols, the base model comes with a built-in 10/100 base-T Ethernet port for network management and high-performance NTP which can serve more than 7,500 NTP requests per second. It includes all the latest functions of NTPv4. It can be deployed in combination with other stratum-1 NTP server(s), can be used in a stratum-2 configuration, and can be expanded through option modules.

  • High bandwidth NTP performance
  • Stratum 1 via GPS and other references or Stratum 2
  • IEEE-1588 PTPv2 grandmaster option
  • STL Option - add STL to GPS or GNSS input references to improve resilience, or use STL alone for indoor applications.
  • Modular hardware supports variety of interfaces and timing signals including 3 additional 1 GbE ports
  • Multiple prioritized reference inputs

  • Internal precision time-keeping via TCXO, OCXO or Rb atomic clock
  • Secure web-based user interface
  • Built-in network sync monitoring option
  • Secure network management: enable or disable protocols
  • IPv4/IPv6 dual stack
  • Alert notifications via SNMP Traps and e-mail alerts
  • CLI/SSH access for automation and scripting
  • Best-in-class 5-year warranty


Options Modules Extend Synchronisation Capability

A unique capability of SecureSync is to add hardware options at initial deployment or later as your network grows. An option adds three (3) 10/100/1000 interfaces to deliver NTP to multiple isolated LAN segments at 1 GigE. Two other options add PTPv2 functionality to the unit. One option is for a configurable master/slave PTP operation over a 10/100 network interface. The other is for PTP grandmaster functionality at 1 GigE. Up to six (6) of either types of ports can be added. Each PTP port is configured and operates independently to improve PTP performance since its processor is independent of all others in the system.   Secure Sync Option Cards
Configurable Capabilities in SecureSync
Internal Oscillatory symbol

Internal Oscillator

  • Derives the precision of frequency signals
  • Maintains accuracy if loss of references (holdover)
  • Quartz or Rubidium
  • Low phase noise options
  • Low-G sensitivity option
GPS-GNSS Receiver Symbol

GPS/GNSS Receiver

  • GPS, Galileo, GLONASS, BeiDou, and more
  • Commercial L1
  • Dual frequency
  • SAASM GPS options
External Time & Frequency References symbol  

External Time & Frequency References

  • Mulitple prioritized
  • Network sync (NTP, PTP)
  • 1PPS, 10 MHz from external clocks
  • Timecode
  • Ground-based radio signals
Network Synchronisation symbol




  • High bandwidth NTP
  • PTP options
  • Assisted GPS
  • Sync monitoring



  • HTTP
  • SNMP
  • IPv6/IPv6
  • LDAP/Radius
  • SMTP
Signal Types symbol

Signal Types

available for signal generation and/or external references

  • Frequency
  • 1PPS
  • IRIG
  • HaveQuick
  • Timecode (other)
  • T1/E1
  • Programmable clock
  • Alarms
  • Event capture
  • Fiber optic interfaces
  • Network interfaces
  • Standard or custom interfaces
  • Custom signals
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  SecureSync   SecureSync Option Cards      
SecureSync User Interface

SecureSync® offers set-up, configuration and monitoring in a variety of ways, such as the front panel, RS-232 “console” port, or through many network services. However, its feature-rich browser interface provides the greatest access to all available tools.

SecureSync User Interface Overview Play icon.png
Overview Demonstration
SecureSync User Interface


VelaSync 1232 High Speed Time Server


VelaSync™ 1232 high speed time server is a network appliance designed for high frequency trading and other low-latency network applications. The combination of VelaSync’s highly optimized timing protocols and management functions, Spectracom’s precision GPS timing technology and the flexibility of commodity hardware offers exceptional performance and keeps pace with the needs of evolving network infrastructure.

VelaSync1232 front facing


  • PTP + NTP on all ports
  • Low 100’s of nanoseconds accuracy
  • 1G/10G/25G/40G Ethernet
  • I/O support for 1PPS, IRIG
  • Multi-GNSS support (GPS, Galileo, GLONASS, Beidou)
  • Rubidium atomic clock option
  • STL sync option for indoor timing or augment GNSS
  • BroadShield GPS jamming and spoofing detection option
  • Advanced user interface and REST API
  • Secure network management; enable or disable protocols for encryption, authentication,authorization and accounting
  • IPv4/IPv6 dual stack
  • Dual redundant and hotswappable AC power supplies and hard drives

Flexible Configuration Provides Reliable, Secure Time

The VelaSync 1232 web-based user interface simplifies the configuration of multiple time sources for resiliency against GPS jamming or spoofing attacks, network issues and equipment failures. For example, the server can be easily setup to use a PTP source as a backup to the on-board GPS and use an NTP source as a cross check. The servers can be setup to back up each other so that if one fails, the time service continues. It includes dual redundant hot-swap power supplies and 1T hard drives.

And now, with the addition of STL, you can augment GNSS signals or cut the cord altogether with an indoor solution.


Smart Reference Monitoring

The VelaSync uses smart reference monitoring to validate the fidelity of all available references. It does this by actively comparing phase offset of each reference against the primary reference and each other. The phase error validation calculates long-term averages and standard deviations of the phase offset between the monitored external reference and the internal system reference. The standard deviation is used to calculate two validity thresholds; a higher and a lower one (the latter acts as a hysteresis buffer, preventing the status flip/flopping if the actual phase error validation value varies closely around the outer threshold).


Security is a priority within the VelaSync and included as part of the standard platform. Capabilities include supporting centralized authentication (LDAP, RADIUS, TACACS+), journaled activity logging, secure protocol support (SSH, HTTPS), and more. Updates are generally released on a quarterly basis, but patches and fixes to major CVE’s are addressed as they are discovered.

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  VelaSync 1232      


Precision Timing Options for Increased Resiliance & Compliance


Broadshield Precision Timing Option

BroadShield for SecureSync is an interference detection suite that keeps your GPS/GNSS Synchronization safe from vulnerabilities caused by jamming and spoofing.

Play icon.png Broadshield Precision Timing option LearnMore_button_OroliaOrange
Introduction Overview



As an encrypted signal 1000x stronger than GNSS, STL is an ideal solution for augmenting GPS or other GNSS constellations for resiliency and security or as a standalone indoor solution when roof access isn’t an option.
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Introduction Solution Brief
STL Precision Timing option



PRISMA Compliance Precision Timing Option

PRISMA Compliance is the first and only software solution that provides true UTC traceability and real-time reporting to comply with MiFID II and FINRA requirements. Gather, analyze and report on all the elements in your timing network in real time.

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Introduction Data Sheet


Legacy & Specialised Market Time Servers, Switches & Amplifers


NetClock Public Safety Master Clock

The Model 9483 NENA-compliant GPS master clock continues Spectracom's legacy of bringing essential time synchronization to public safety answering points (PSAPs) and other emergency and command and control systems.

More than 4,500 PSAPs across North America trust a NetClock master clock / time server to validate 911 event records, improve response times and facilitate interoperability with Legally Traceable Time®. The latest NetClocks are easier than ever to install and manage while maintaining strict compliance to the North American National Emergency Number Association’s (NENA) Master Clock Standard #04-002. Features support Next-Generation 911 initiatives and has been tested against NENA’s Security for Next Generation 9-1-1 Standard #075-001.

Spectracom Netclock 9483 Public Safety Master Clock


NetClock GPS NTP Server

Spectracom’s NetClock Model 9489 delivers worldwide, split-second timing for an NTP network with the highest security, reliability, and ease of management. It is designed for applications requiring an affordable but state-of-the-art GPS NTP server.

For today’s network and computer systems that require time-sensitive data for such tasks as logging events, records management, network optimization and troubleshooting, and synchronizing operations, we offer our high performance NTP server technology in this specific NetClock model, and as a direct replacement for previous generation models: 8189, 9189, 9289, and 9389.

Spectracom Netclock 9489 GPS NTP Server


Epsilon EC-20S GPS Clock

High-performance GPS Clocks are designed to exceed digital TV, digital Radio, 4G base stations, satcom time and frequency synchronization requirements.

Epsilon Clocks provide accurate and stable time and frequency signals for your high-performance synchronization application. The unit’s optimized architecture is well-suited to transmitter synchronization of digital broadcast signals (DVB-T/T2, T-DMB, DAB or DRM) in Single Frequency Networks (SFN) modes: the high port density allows to synchronize many emitters simultaneously on the same site.

Spectracom Epsilon GPS Clocks


Epsilon SAS Switch & Amplifier System

SAS-E is a high performance, highly manageable and reliable solution for distributing time and frequency signals for satcom, digital TV or audio broadcast, microwave links, satellite ground stations applications.

The Epsilon™ Switch and Amplifier System (SAS-E) provides a cost effective way to extend distribution of time and frequency signals (pulse, low phase noise frequency signal, Time of Day), as a signal amplifier. Thanks to analog amplification, SAS-E adds very little phase noise to the input frequency and ensures high RF isolation. It is therefore suitable for reference frequency distribution towards transmitters, up-converters, micro-wave links. Pulse regeneration is transparent to pulse duration and period: SAS-E is therefore suitable for distribution of any pulse encoded signal like 1 pps, DCLS IRIG, etc.

Spectracom Netclock 9483 Public Safety Master Clock


GPS/GNSS Antennas and Accessories


Model 8230 GPS/GNSS Outdoor Antenna

The Model 8230 is a high gain (40 dB) GNSS outdoor antenna covering GPS L1, Galileo E1, GLONASS L1, and BeiDou B1 . It uses a three stage low noise amplifier, a mid-section SAW, and a tight pre-filter to protect against saturation by high level sub-harmonics and L-band signals.

Spectracom Model 8230 GPS Antenna
  Technical Note, "Outdoor GPS Antenna Installation Considerations": GPS-Antenna-Installation_TN07-101_D_Vicom.jpg  
  Installation Guide, "Model 8230 Outdoor GPS Antenna": 8230 GPS Antenna Installation Guide thumb  


Spectracom Model 8230AJ Anti-jamming GPS Antenna

Model 8230AJ GPS/GNSS Anti-Jam Outdoor Antenna

The Model 8230AJ is a high gain (40 dB) GNSS outdoor antenna. It uses a three-stage low noise amplifier, a mid-section SAW, and a tight pre-filter to protect against saturation by high level sub-harmonics and L-band signals. The Anti-Jam antenna rejects signals for the lower elevation angles – where most of the interference comes from.


Standard or Anti Jam (AJ) Antenna – Which Should I Use?

The standard antenna sees the entire view of sky, equally receiving signals from satellites at the horizon or the zenith and all points in between. However, there is increasing interference in the GNSS L1 band, whether unintentional from other transmitters like communications towers or intentional from illegal “privacy jammers”. The AJ antenna rejects signals for the lower elevation angles – where most of the interference comes from – and only receives signals from the higher elevation angles where the satellites are. Of course, this reduces the number of satellites the receiver will see, but for the timing application, only a few satellites are needed. Moreover, with multi-constellation receivers, there are an increasing number of satellites available. So you get all the performance in timing accuracy you would get with a standard antenna plus 20 dB or more of interference rejection.

etwork Diagram - Using a Passive Anti-Jam Antenna to Combat GNSS Interference
Case Study, "Using a Passive Anti-Jam Antenna to Combat GNSS Interference" Case Study - Using a Passive Anti-Jam Antenna to Combat GNSS Interference_Spectracom.jpg


GPS Antenna Mounting Accessories

Spectracom offers various mechanical assemblies to support a reliable outdoor antenna installation.

 Spectracom GPSP Antenna Mounting Accessories


Spectracom GPS Antenna RF Down-Up Convertor kit
GPS Antenna RF Down-Up Convertor Kit

Another approach to long cable runs down converts the GPS RF frequency in a specialized roof-top antenna to minimize signal loss and allows RG-58 cable to extend up to 1,500 ft (450 meters). The kit comes with an upconverter that is installed near the GPS receiver.



GPS Antenna Fibre Optic Link Kit

A fibre optic link can bridge a long antenna-receiver distance and provides for electrical isolation. A typical kit can link a fibre transmitter and receiver via singlemode simplex fibre for up to 8 km.

Spectracom GPS Antenna Fibre Optic Link


 Spectracom GPS Antenna Surge Surpressor
GPS Antenna Surge Suppressor

Model 8226 protects the receiver, and other inside equipment, from damaging voltages. Voltages exceeding the impulse suppressor trip point are shunted to the system ground. The surge suppressor is supplied with a mounting bracket. A Grounding Kit is also available.

  Technical Note, "GPS Lightening Surge Production": GPS-Lightning-Protection_TN08-101_C thumb  
  Installation Guide, "Model 8226 Surge Suppressor": Model 8226 Installation Guide thumb  


GPS Antenna In-Line Amplifier

The Model 8227 is a convenient solution when the GPS RF falls below the receiver's recommend minimum input. While the maximum cable length depends on thegain of the antenna, loss of the cable and sensitivity of the receiver, we find that the inline amplifier can extend a cable run by 130 metres.

 Spectracom GPS Antenna In-line Amplifier


 Spectracom Low-loss GPS Antenna Cable
GPS Antenna Low-loss RF Cable

Spectracom offers LMR-400 equivalent cable assemblies terminated with type N connectors. Order CA01-0N0N-3xxx, where xxx = length in feet. Contact us for special requirement cable.



Skylight Indoor GPS Timing System

The solution for indoor GPS timing. Consisting of an indoor GPS antenna panel, a configuration of Spectracom's SecureSync modular GPS time server and an interconnect cable, Skylight opens up new opportunities for accurate GPS time.

Spectracom Skylight GPS Indoor Antenna