Timing modules

Timing GNSS modules provide high-precision, reliable time and frequency synchronization for telecom, networking, financial, and industrial applications. With multi-GNSS support, low-jitter output, and easy integration, these modules ensure accurate timing even in challenging environments.

Subcategories:

High-Precision Timing GNSS Modules for Time and Frequency Synchronization

Our Timing GNSS modules provide exceptional precision for time and frequency synchronization in telecom, networking, financial, and industrial systems. Supporting multi-GNSS constellations (GPS, Galileo, BeiDou, GLONASS), they deliver sub-microsecond accuracy for PPS and PTP applications. These reliable modules maintain stable timing even under weak signal conditions, making them ideal for 5G networks, data centers, and mission-critical operations that demand continuous, accurate synchronization.

Typical Applications of Timing GNSS Modules

5G and telecom network synchronization for precise timing in modern communication systems
Financial transaction timestamping for accurate and reliable logging
Industrial automation and control systems requiring precise time coordination
Scientific research and metrology applications demanding sub-microsecond accuracy

FAQ: Timing modules

What is a timing GNSS module and how is it different from a standard GNSS receiver?

A standard GNSS receiver is optimised for positioning — it outputs latitude, longitude, and altitude. A timing GNSS module is designed specifically to output highly accurate time signals — typically a 1PPS (one pulse per second) signal and NMEA time data — with nanosecond-level precision. Timing modules like the NEO-M8T, ZED-F9T, and NEO-F10T provide raw measurement data and time pulse outputs that standard positioning receivers do not offer, making them suitable for network synchronisation, frequency standards, and time-stamping applications.

What is 1PPS and why does it matter for timing applications?

1PPS (one pulse per second) is a precisely timed electrical pulse output that occurs exactly once per second, synchronised to GNSS-derived UTC time. The accuracy of this pulse — typically better than 20–100 nanoseconds RMS depending on the module — makes it the reference signal used to discipline oscillators, synchronise network equipment (PTP/IEEE 1588), and calibrate time-frequency systems. All timing modules in this collection output a 1PPS signal via a dedicated hardware pin or SMA connector.

What is the difference between NEO-M8T and ZED-F9T

The NEO-M8T is a single-band (L1) timing receiver — reliable, low-cost, and widely used in NTP servers, amateur radio timing, and scientific applications. The ZED-F9T is a multi-band (L1/L2 or L1/L5) timing receiver from the u-blox F9 platform, offering significantly better timing accuracy, faster convergence, and resilience to multipath and ionospheric errors. The ZED-F9T also supports 5G network synchronisation requirements and outputs RAIM (Receiver Autonomous Integrity Monitoring) data for mission-critical applications. For telecom, 5G, and financial infrastructure, the ZED-F9T is the recommended choice. For cost-sensitive projects with standard accuracy requirements, the NEO-M8T is a proven and well-supported option.

What is the difference between ZED-F9T-00B and ZED-F9T-10B?

Both are u-blox ZED-F9T timing modules, but they operate on different frequency bands. The ZED-F9T-00B uses L1/L2 bands, while the ZED-F9T-10B uses L1/L5/E5a bands — the newer L5 signals offer improved signal strength, lower noise, and better performance in challenging environments. The ZED-F9T-10B is the recommended variant for new designs targeting 5G synchronisation and next-generation infrastructure.

What is the difference between LEA-M8T and LEA-M8F?

Both are u-blox M8 generation timing modules in the LEA form factor. The LEA-M8T is a time and raw data receiver — it outputs 1PPS timing pulses and raw GNSS measurement data suitable for post-processing and time transfer applications. The LEA-M8F is a time and frequency reference module that additionally outputs a stable frequency reference signal, making it suitable for disciplining oscillators and frequency standards where a continuous frequency output is required alongside the 1PPS pulse.

What is the mosaic-T and for which applications is it designed?

The mosaic-T is Septentrio's professional-grade multi-band, multi-constellation timing receiver, supporting all GNSS bands including GPS, Galileo, BeiDou, and GLONASS across L1/L2/L5/E6 frequencies. It is designed for the most demanding timing applications — stratum-1 NTP/PTP grandmaster clocks, GNSS-disciplined oscillators (GPSDO), defence-grade time references, and scientific instrumentation. The mosaic-T includes Septentrio's AIM+ interference mitigation technology, making it highly resistant to jamming and spoofing — critical for infrastructure that must maintain timing continuity under adversarial conditions.

Which timing GNSS module is best for 5G network synchronisation?

For 5G network synchronisation (fronthaul, midhaul, backhaul timing per ITU-T G.8272/PRTC-A and PRTC-B requirements), the ZED-F9T is the most widely deployed choice — it meets the timing accuracy requirements for most 5G synchronisation use cases and is available in SMA board, InCase PIN, and USB dongle form factors. For the most stringent PRTC-B class requirements or environments with significant interference risk, the mosaic-T from Septentrio is the recommended solution.

Can timing GNSS modules be used for NTP or PTP grandmaster clocks?

Yes. Timing GNSS modules are the standard source of UTC-traceable time for NTP servers and PTP grandmaster clocks. The module provides the 1PPS reference signal and NMEA time data that the NTP/PTP software stack uses to discipline the system clock. The NEO-M8T and ZED-F9T are commonly used in open-source NTP server projects (chrony, gpsd, ntpd) as well as commercial grandmaster clock appliances. For IEEE 1588v2 PTP grandmaster applications requiring sub-100ns accuracy, the ZED-F9T or mosaic-T are recommended.

What form factors are available for timing GNSS modules?

Timing modules in this collection are available in several form factors to suit different integration requirements: SMA boards (open EVAL boards with SMA antenna connector for lab and development use), InCase PIN boards (compact enclosed modules with PIN headers for embedded integration), USB dongles (plug-and-play connection to any computer via USB, with SMA antenna port), mPCIe cards (Mini PCIe form factor for direct integration into embedded systems and industrial computers), and breakout boards (minimal footprint for prototyping). All form factors provide access to the 1PPS output signal.

Do I need a special antenna for a timing GNSS module?

Antenna quality has a direct impact on timing accuracy. For timing applications a survey-grade or timing-grade multi-band active GNSS antenna is strongly recommended over a standard patch antenna — it provides better gain, lower phase centre variation, and more consistent signal tracking across all GNSS constellations and frequencies. For stationary installations a choke ring antenna offers the best multipath rejection. For L1/L5 modules (ZED-F9T-10B, NEO-F10T) ensure the antenna covers both L1 and L5 frequency bands. The antenna should be mounted with a clear sky view and away from reflective surfaces.