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Type	Title	Date
White Papers: The Importance of Low Phase Noise in Military Mobile Applications	The Importance of Low Phase Noise in Military Mobile Applications Military communications and intelligence-collection functions, traditionally associated with fixed sites and large platforms, are being pushed to tactical vehicles and sophisticated Unmanned Autonomous Vehicles (UAVs). This results in more C5ISR systems being installed on mobile platforms. Whether in the air, on land, or at sea, these vehicles will impart shocks and vibrations to their electronics, sometimes severely. In high vibration environments, the system designer must account for induced phase noise which can drastically affect overall performance. This white paper discusses the challenges of keeping low noise signals pure in any environment.	pdf - 903 KB Wednesday, August 22, 2018 [ Permalink ]
White Papers: SmarTiming+ GPS/GNSS Disciplining Technology Whitepaper (Chinese)	SmarTiming+ GPS/GNSS Disciplining Technology Whitepaper (Chinese)	pdf - 635 KB [ Permalink ]
White Papers: Practical Guide to GADSS Autonomous Distress Tracking Implementation	Practical Guide to GADSS Autonomous Distress Tracking Implementation The Autonomous Distress Tracking (ADT) mandate is part of the Global Aeronautical Distress and Safety System (GADSS) initiative launched by ICAO after several accidents where downed aircraft could not be located at all, or only after long and expensive search efforts. While most airlines have already complied with the normal tracking mandate due by the end of 2018, the ADT requirement for January 2021 is approaching fast. It is designed to improve the location of aircraft in the critical phase, when the aircraft is in distress, anywhere in the world.	GADSS White Paper Monday, December 3, 2018 [ Permalink ]
White Papers: Wanted: Reliable PNT for Intelligent Transportation Systems	Wanted: Reliable PNT for Intelligent Transportation Systems A key feature of the concept of the connected car is accurate Positioning, Navigation and Timing technology. These must be more reliable and accurate than ever before, and they must co-exist with a multitude of other types of sensors and the computational loads associated with them. This white paper explores the trends relative to the big-picutre of intelligent transportation systems.	pdf - 3 MB Friday, November 4, 2016 [ Permalink ]
White Papers: The Importance of Testing to Detect GNSS Vulnerabilities in Intelligent Transportation Systems	The Importance of Testing to Detect GNSS Vulnerabilities in Intelligent Transportation Systems For more than a decade, GPS has been at the core of the navigation systems used in all types of road vehicles, train systems and marine transport vehicles. As industry moves from standalone navigation systems to the advanced multi-sensor systems used in intelligent transportation systems (ITS), GPS signals remain a key component of these systems. The development of autonomous vehicles for road, rail and water demands a comprehensive and repeatable test plan for GNSS. This white paper discusses and outlines testing methods for GNSS performance and vulnerabilities.	White Paper Friday, October 26, 2018 [ Permalink ]
White Papers: MiFID II Clock Sync Requirements Checklist	MiFID II Clock Sync Requirements Checklist In January 2018, MiFID II RTS 25 compliance began, including five requirements for timing synchronization. Use this detailed checklist to make sure that you’re aware of the key considerations, your timing chain is ready and you're fully compliant.	MiFID II Checklist Friday, January 19, 2018 [ Permalink ]
White Papers: Cost-effective Synchronization for Digital Broadcast	Cost-effective Synchronization for Digital Broadcast In Europe, Middle East, Africa and Southeast Asia, broadcasters are looking to the DVB-T2 standard to upgrade from analog transmission, their current DVB-T implementation, or as a supplemental network. Similarly, in South America, ISDB-T is being implemented. These and other standards rely more and more on single frequency networks (SFN) to efficiently utilize wireless frequency spectrum. SFNs require synchronization so for each instant of time, every transmission station is broadcasting the same digital data at the same exact frequency.	pdf - 739 KB Thursday, July 26, 2012 [ Permalink ]
White Papers: Mitigating an NTP Distributed Denial of Service (DDoS) Attack	Mitigating an NTP Distributed Denial of Service (DDoS) Attack Network time service is not something many businesses think about as a key component of their critical infrastructures. In fact, it is often overlooked entirely, and in error. As a result, the network architect or engineer often defaults to an easy alternative: using a server or network switch as the source of the network clock and synchronizing these sources to Internet time servers using Network Time Protocol (NTP). This white paper discusses the risks of, and alternative solutions to, "NTP Over the Internet."	Mitigating an NTP Distributed Denial of Service (DDoS) Attack Wednesday, August 29, 2018 [ Permalink ]
White Papers: Time Synchronization: Time is at the Heart of the MiFID Regulation	Time Synchronization: Time is at the Heart of the MiFID Regulation New regulations from MiFID II in Europe to the Consolidated Audit Trail in the US mandate that reportable events must be timestamped to much more accurate levels than ever before and that regulated organizations must have a clear understanding of time for all information they are required to report. Europe’s MiFID II, in particular — which came into force on January 3, 2018 — is far more prescriptive with regards to timestamping, as defined by the European Securities and Markets Authority (ESMA) within RTS 25.	White Paper Wednesday, January 24, 2018 [ Permalink ]
White Papers: The Traceability of Time Synchronization: Why Internet Time Isn’t Good Enough	The Traceability of Time Synchronization: Why Internet Time Isn’t Good Enough The traceability of time synchronization: This document briefly discusses the differences between a time source from within the network compared to outside the network with considerations for traceability for a network deployment of network time protocol (NTP).	pdf - 360 KB Wednesday, March 6, 2019 [ Permalink ]
White Papers: Why Accurate Time is Essential for Video Surveillance and Security Programs	Why Accurate Time is Essential for Video Surveillance and Security Programs With IP-based video surveillance hardware, commercial and government security professionals can now significantly improve their security system’s efficiency, performance and functionality by leveraging modern networking technologies. However, as is the case with any network, time synchronization – where all clocks in cameras, access systems, recording equipment, and computers have the same time – is essential, not only to ensure proper operation of your surveillance systems, but also to ensure the credibility of legal evidence.	pdf - 2 MB Tuesday, October 15, 2019 [ Permalink ]
White Papers: Simplifying the Path Alignment of Microwave Communication Systems	Simplifying the Path Alignment of Microwave Communication Systems Wherever microwave links exist, the path between antennas has always required accurate antenna alignment. This process requires highly trained tower crews to physically align the antennas as well as ground technicians and sophisticated, expensive, and complex test equipment to monitor the results. The process of optimizing the transmission path of microwave communication systems is about to undergo a significant development in process, simplification and cost benefit without compromising performance or accuracy. The process can now be accomplished with the use of the Pendulum (formerly XL Microwave) Path Align-R Microwave Antenna Path Alignment Test Sets. Tower installation crews can now perform the entire alignment process themselves, up the tower, at the antenna, without the need of additional ground technicians, equipment, or indeed, even the waveguides or radios installed. By Fernando Torrelio, is President and Chief Engineer of Aurora Genesis Communications Inc., a microwave, cellular, PCS, & LMDS engineering, maintenance, installation, and testing company supporting the technical requirements of the wireless communications industry.	pdf - 132 KB Thursday, May 3, 2012 [ Permalink ]
White Papers: Synchronized Time Improves Healthcare	Synchronized Time Improves Healthcare As the healthcare industry embraces technology to improve patient care and reduce costs, integrating disparate systems is critical for maximizing performance. Something as simple as a common basis for time-keeping can make a difference in records accuracy, device and system interoperability, security, regulatory compliance, and overall efficiency of operations. As technology implementations are network centric, time-keeping in software and hardware can be easily synchronized to the official worldwide time standard.	pdf - 664 KB Wednesday, September 30, 2015 [ Permalink ]
White Papers: Time for Data Centers to Consider Time as a Service	Time for Data Centers to Consider Time as a Service If you are in the data center business, you’re faced with a long list of customer demands as businesses and entire industries move operations to the cloud. But you’re also facing an increasingly competitive landscape where offering the best service and greatest value is paramount. Balancing what you can offer customers and at what cost can be complicated, to say the least. An often overlooked service offering, one which provides a large value to customers at a low cost to providers, is Time as a Service (TaaS).	pdf - 472 KB Tuesday, April 21, 2015 [ Permalink ]
White Papers: Resilient PNT Solutions for Telemetry During GNSS Outage Test Scenarios	Resilient PNT Solutions for Telemetry During GNSS Outage Test Scenarios GNSS (Global Navigation Satellite System) is key to effective situational awareness, providing critical Positioning, Navigation and Timing (PNT) telemetry data for mobile military operations. Yet GPS/GNSS jamming and spoofing attacks are on the rise. The disruption of GNSS for increasing periods of time through jamming/ spoofing must now be an essential test component in most test scenarios today. How can you still provide reliable Time-Space Position Information (TSPI) during periods of GNSS denial? This white paper identifies technologies, best practices and strategies for GNSS jamming/spoofing detection and protection systems, and testing protocols to maintain a state of PNT readiness.	White Paper Tuesday, October 29, 2019 [ Permalink ]
White Papers: A Master Clock Approach to Distributing Precision Time and Frequency	A Master Clock Approach to Distributing Precision Time and Frequency Traditional time and frequency distribution is defined by splitting and amplifying a signal to as many devices as needed. The distribution amplifier became a mainstay in precision time and frequency systems. Today there is greater access to precision timing considering more clocks in space transmitting global navigation signals and more network connectivity able to maintain higher levels of timing accuracy. A new generation of master clocks is capable of leveraging these trends while offering flexibility to generate the signal types and quantities wherever needed. Distribution amplifiers can still be an important “brick” in the system to meet needs for redundancy, reliability and cost-efficiency. This white paper describes the issue of providing precise time and frequency signals of the type and quantity needed by the application using commercial-off-the-shelf devices from Spectracom.	pdf - 652 KB Friday, January 31, 2014 [ Permalink ]
White Papers: What Time is it? It’s a Matter of Trust	What Time is it? It’s a Matter of Trust Those in the business of measuring time are familiar with the saying, “If you have one clock, you know what time it is. If you have two, well…”. Time synchronization is the ability for all clocks to have the same time. But what time is it? If your time synchronization deployment uses time from the internet, your organization may be at risk. Official time provided by a GPS-based network appliance is a time source that you can trust.	pdf - 399 KB Friday, September 5, 2014 [ Permalink ]
White Papers: Why Time Synchronization Is Critical for Improving Public Safety Answering Points (PSAPs)	Why Time Synchronization Is Critical for Improving Public Safety Answering Points (PSAPs) When 911 dispatch and other recording systems employ synchronized time solutions, the improved data records deliver measurable life-saving differences in their communities and provide the potential for reduced insurance rates. This white paper discusses key benefits to implementing a Legally Traceable Time® architecture.	pdf - 952 KB Tuesday, May 21, 2019 [ Permalink ]
White Papers: What is a GPS Simulator?	What is a GPS Simulator? As GPS receivers are built into more mission-critical devices for difficult application environments, and designed with the emerging capabilities of a multitude of GNSS constellations and augmentation systems, developers and manufacturers need better ways to guarantee performance. That’s where a GPS simulator comes in.	pdf - 99 KB Monday, December 31, 2018 [ Permalink ]
White Papers: Leap Second Readiness Tips	Leap Second Readiness Tips 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 - 224 KB Monday, December 31, 2018 [ Permalink ]
White Papers: Tech Brief Resiliency in PNT: Cybersecurity	Tech Brief Resiliency in PNT: Cybersecurity This Orolia Tech Brief explores the basic steps for maintaining security using a network-connected time server and looks at different ways to achieve resiliency in PNT. As an example, we will start with our SecureSync® Time Server product line to demonstrate how to maintain security with this network-connected device.	pdf - 351 KB Friday, February 22, 2019 [ Permalink ]
White Papers: A Holistic Approach to Trusted, Resilient PNT	A Holistic Approach to Trusted, Resilient PNT Positioning, navigation and timing (PNT) services are indispensable, and providing trusted, resilient PNT solutions requires us to look beyond individual systems and methodologies to focus upon the user. An architecture that can meet this demand must include multiple systems with diverse technologies so that any single threat or source of disruption can be mitigated. This document discusses how signaling technologies such as GNSS, eLoran and STL are the complementary components of this architecture.	pdf - 583 KB Wednesday, May 9, 2018 [ Permalink ]
White Papers: The Advent of Tightly Synchronized Clocks in Distributed Systems	The Advent of Tightly Synchronized Clocks in Distributed Systems The last decade has brought a paradigm shift in computing systems from single processor devices — whose performance plateaued — to distributed computing systems. In distributed systems, nodes execute concurrently with limited information about what the other nodes are executing at the moment. A key component of distributed coordination is the enforcement of consistent views at all nodes for the ordering of significant events. To this end, events are "timestamped" with logical counters or — increasingly lately — with tightly-synchronized physical time.	White Paper Friday, May 11, 2018 [ Permalink ]
White Papers: Making Time Sensitive Networks Resilient Against Threats White Paper	Making Time Sensitive Networks Resilient Against Threats White Paper Today's time sensitive networks rely on available and accurate positioning, navigation and timing (PNT) signals to provide leaders with the information required to make timely and effective decisions. The proliferation of GNSS-degrading and denying devices across state and non-state actors put this critical information capability in jeopardy. Learn how a combination of alternative PNT signals with traditional GNSS references makes PNT applications resilient against jamming and spoofing.	White Paper Friday, May 11, 2018 [ Permalink ]
White Papers: Tech Brief Resiliency in PNT: GPS/GNSS Jamming and Spoofing	Tech Brief Resiliency in PNT: GPS/GNSS Jamming and Spoofing Reliance on GNSS is now commonplace. However, all GNSS systems share a common vulnerability: their signals are very weak. GNSS satellites operate from Mid-Earth Orbit (MEO), approximately 20,000-25,000 km above the earth, to provide the best coverage and geometry for triangulation. As such, the transmitted signal is extremely weak upon arrival at the surface of the earth – so weak that it is weaker than the surrounding radio noise. Special signal processing techniques recover the GNSS signal from the background noise, but the weak signal strength at the user’s receivers makes GNSS navigation very susceptible to interference.	pdf - 641 KB Tuesday, July 2, 2019 [ Permalink ]
White Papers: SmarTiming+ GPS/GNSS Discipining Technology Whitepaper	SmarTiming+ GPS/GNSS Discipining Technology Whitepaper Patented Smart SRO Rubidium SynClock+ with Industry'S First SmarTiming+ Technology Inside	pdf - 857 KB Friday, September 7, 2012 [ Permalink ]
Visio: 9300 Series NetClock and Related Time Sync Products Visio Shapes	9300 Series NetClock and Related Time Sync Products Visio Shapes Visio shapes for NetClock model 9383, 9389, 9388 and other related time synchronization products.	vss - 2 MB Friday, August 3, 2012 [ Permalink ]
Visio: Broadcast Network Sync Visio Shapes	Broadcast Network Sync Visio Shapes Vizio shapes for Spectracom synchronization and test products and other network elements typically found in a synchronized digital broadcast network.	vss - 182 KB Friday, August 3, 2012 [ Permalink ]
Visio: NetClock 9300 Series Rear Panel Visio Shapes	NetClock 9300 Series Rear Panel Visio Shapes Visio shape line drawings of 9383, 9389, 9388 rear panels.	vss - 631 KB Friday, August 3, 2012 [ Permalink ]
Visio: NetClock 9483 and Accessories Visio Shapes	NetClock 9483 and Accessories Visio Shapes Visio shapes for NetClock 9483 popular configurations - front and rear panels - with typical add-on products.	VSS - 570 KB Monday, October 21, 2013 [ Permalink ]
Visio: SecureSync Visio Shapes	SecureSync Visio Shapes A couple of Visio shapes for the SecureSync modular time and frequency reference system.	vss - 36 KB Thursday, July 11, 2013 [ Permalink ]
Technical Notes and Briefs: The Onboard Galileo Rubidium and Passive Maser - Status & Performance	The Onboard Galileo Rubidium and Passive Maser - Status & Performance Galileo program is approved by the European Commission and the European Space Agency (ESA). The activities related to GSTBV2 experimental satellite as well as the implementation of the In Orbit Validation phase are in progress. Atomic clocks represent critical equipment for the satellite navigation system and clocks development has been continuously supported by ESA.	pdf - 571 KB [ Permalink ]
Technical Notes and Briefs: Differences Between NTP and SNTP	Differences Between NTP and SNTP 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 - 64 KB Wednesday, February 13, 2019 [ Permalink ]
Technical Notes and Briefs: How to Restore Analog Radio Coverage Stolen by Narrowbanding	How to Restore Analog Radio Coverage Stolen by Narrowbanding Coverage problems were created when analog systems were narrow-banded. Mission critical communications demand the ability of officers in the field to communicate when necessary. Simulcast and receiver voting can improve talk-in with maximum return on your investment – which is far less expensive than a major infrastructure build-out to add channels or a forklift radio change to P25 or DMR.	pdf - 523 KB Tuesday, July 2, 2019 [ Permalink ]
Technical Notes and Briefs: Maintenance Policy for all Kannad ELTs: SL S18XX50X-25-02	Maintenance Policy for all Kannad ELTs: SL S18XX50X-25-02 Rev 04 – Issue Jan. 24/2018	pdf - 137 KB Wednesday, January 24, 2018 [ Permalink ]
Technical Notes and Briefs: Time Server Port Isolation for Secure Networks	Time Server Port Isolation for Secure Networks When leveraging a single master clock / time server across several network segments there are various approaches to port isolation: software isolation, or hardware isolation via multiple processors, unidirectional communication of timing data, or electrical isolation by using fiber optics.	pdf - 64 KB Tuesday, December 23, 2014 [ Permalink ]
Technical Notes and Briefs: Leap Second Solution for Spectratime GXClok-500	Leap Second Solution for Spectratime GXClok-500	pdf - 58 KB Wednesday, December 12, 2018 [ Permalink ]
Technical Notes and Briefs: GPS WEEK NUMBER ROLLOVER ISSUES	GPS WEEK NUMBER ROLLOVER ISSUES	pdf - 108 KB Friday, May 25, 2018 [ Permalink ]
Technical Notes and Briefs: Kannad recommendations following Cobham SB 02/2011 and EASA AD 2011-0103: SL S18XXXXX-25-02	Kannad recommendations following Cobham SB 02/2011 and EASA AD 2011-0103: SL S18XXXXX-25-02 Rev 00 – Issue Jun. 15/2011	pdf - 214 KB Wednesday, June 15, 2011 [ Permalink ]
Technical Notes and Briefs: Time Synchronization for Secure Networks using Fiber	Time Synchronization for Secure Networks using Fiber Government and military networks often utilize the concept of unclassified (black) networks vs classified (red) networks to manage levels of information security. Since a complete “air-gap” around a highly sensitive network is not practical, every data connection is evaluated as a security risk. To synchronize a master source of time on a red network, Spectracom offers a fiber optical IRIG time code link between a SecureSync master-slave pair to offer high accuracy timing to a classified network while satisfying the requirements of SIPRNET, NIPRNET and other ultra-secure network systems.	pdf - 254 KB Thursday, May 8, 2014 [ Permalink ]

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