Open Time Appliance Mini

Portable Grandmaster Clock

Open Time
Appliance Mini

Synchronise • Validate • Test

A compact Open Time Appliance built for resilient timing at the edge, in the rack, or out in the field, with multiband GNSS, precision holdover, and optional battery-backed operation.

From £1,395.00 GBP

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What It Is

Grandmaster Clock - Portable Verification

The Open Time Appliance Mini brings grandmaster-class timing into a form factor that is easy to deploy, easy to carry, and ready for harsh real-world conditions. Use it as a primary edge grandmaster, a resilient backup clock that rides through outages, or a portable validation instrument for on-site testing.

5ns Accuracy to UTC
1.5µs 24hr Holdover
6hrs+ Battery Life
Dual Ethernet Ports
144mm Form Factor

Deployment Modes

One Platform, Three Jobs

The Mini is positioned as more than a single-use appliance. It can anchor a live network, protect timing during disruption, or travel as a precision reference for commissioning and troubleshooting.

Primary Edge Grandmaster

Deploy close to radios, media infrastructure, labs, or industrial networks where space is limited but timing quality still matters.

Resilient Holdover Appliance

With DOCXO and the optional integrated battery, the appliance continues distributing time through GNSS disruption and local power loss.

Portable Test Reference

Take a stable time source into the field for acceptance testing, fault isolation, and timing audits.

5 min video walkthough

Founder Fundamentals

Get hands on with the OTA Mini

Understand it's features

Find out about the build / config options

Status lights, OSNMA, Battery Powered

and more

Trusted Timing

Secure Galileo OSNMA

For deployments where timing integrity matters as much as timing accuracy, both PT and lite modules can take advantage of Galileo's Open Service Navigation Message Authentication to strengthen trust in its GNSS reference.

Secure and Resilient GNSS

Authenticated satellite data for more confident edge timing

By using Galileo OSNMA, the Precision Timing model adds authentication to the navigation message itself, helping the appliance distinguish genuine Galileo transmissions from spoofed or manipulated signals.

Signal Authenticity

OSNMA lets the PT model verify that Galileo navigation data comes from an authenticated source.

Resilient Timing Decisions

Only authenticated Galileo inputs are used enabling the system to make more robust timing decisions during contested and uncontested GNSS conditions.

Better Fit for Critical Sites

Valuable for telecom, utility, broadcast, defence-adjacent, and mobile field deployments.

Galileo OSNMA Authenticated GNSS
PT and Lite Secure timing tier
GNSS Holdover Layered resilience
TrustBridge Authenticated only

Applications

Built for Real-World Timing

Solves clock drift, signal loss, and synchronisation gaps with resilient, high-precision timing that keeps distributed systems aligned in critical operations.

Broadcast & Media

Support for SMPTE ST 2059-2, AES67, and related profile requirements makes the Mini well suited to studios, OB workflows, and media facilities that need deterministic timing without adding bulky rack hardware.

Telecom & 5G

The compact chassis fits edge and constrained telecom locations while multiband GNSS, holdover options, and ITU-T profile support help maintain accurate phase and frequency for 4G, 5G, and transport timing chains.

Field Testing & Validation

Bring timing assurance directly to the site. Optional battery-backed operation lets engineers validate infrastructure, troubleshoot synchronisation issues, and prove network performance without needing permanent power.

Why Choose

The OTA Mini Advantage

Up to 5ns Accuracy

Multi-band GNSS with up to 5ns time pulse accuracy to UTC — nanosecond precision for the most demanding timing environments.

Synchronisation Redundancy

Dual Ethernet ports deliver synchronisation redundancy. PTP, NTP, PPS & Frequency distribution all from a single compact device.

Battery-Powered Resilience

Optional integrated battery delivers 6+ hours of operation — stays online through power outages and untethered in the field.

Full PTP Profile Support

Supports all major PTP profiles — Default, Power, Broadcast, Telecom, and TSN/AVB — plus NTP and PPS, out of the box.

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Two Tiers of Precision

Both variants share the same enclosure and overall appliance experience. The decision comes down to accuracy, oscillator performance, and network redundancy requirements.

Precision Timing Module

Professional

Precision Timing Module

  • GNSS accuracy: up to 5ns
  • GNSS: GPS + GAL + BDS L1/L2/L5
  • Integrated OCXO holdover: 1.5µs / 8hrs
  • Dual RJ45 ports (full redundancy)
  • Galileo OSNMA enabled

From £1,695.00 GBP

Precision Timing Lite

Standard

Precision Timing Lite

  • GNSS accuracy: up to 10ns
  • GNSS: GPS + GAL + BDSL1/L2/L5
  • No integrated OCXO holdover
  • 1x RJ45 port (single network connection)
  • Galileo OSNMA enabled

From £1,395.00 GBP

Specification Precision Timing Precision Timing Lite
Time pulse signal accuracy Up to 5ns Up to 10ns
GNSS constellations GPS + GAL + BDS GPS + GAL + BDS
GNSS bands L1 / L2 / L5 L1 / L2 / L5
Integrated OCXO holdover 1.5µs / 8hrs without GNSS —
Enhanced DOCXO holdover 1.5µs / 24hrs without GNSS —
Ethernet ports Dual RJ45 (redundancy) Single RJ45
DOCXO & Integrated Battery

Optional Upgrades

DOCXO & Integrated Battery

The Double Oven-Controlled Crystal Oscillator (DOCXO) uses two temperature-controlled ovens to stabilise a quartz crystal, offering parts-per-trillion (ppt) frequency stability for critical applications. Pair with the optional integrated battery for 6 hours+ of fully untethered operation. Over 24 hours of holdover below 1.5µs.

6hrs+ Battery life (optional)
1.5µs Holdover / 24hrs
parts-per-trillion DOCXO stability

Technical Details

Specifications

Physical Dimensions

144mm Length
82.5mm Width
43.82mm Height
Specification Detail
Ethernet Up to dual RJ45 1GbE for PTP and NTP distribution
Outputs PTP, NTP, PPS and frequency distribution
GNSS Multi-band L1/L2/L5 (SMA antenna)
Oscillator OCXO (DOCXO upgrade available)
DOCXO Holdover 1.5µs / 24hrs without GNSS
DC Power 30W via 12V 2.5A barrel jack
USB Type-C Console & 27W power
Display Mini HDMI
Timing I/O 1PPS, 10Mhz, Frequency input & dual programmable output
Battery (optional) Up to 6 hours+ runtime
WiFi Optional upgrade

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CONNECTIVITY & I/O

Front Panel
  • RJ45 1GbE (up to two ports)
  • USB Type-C Console + 27W power
  • Mini HDMI Display output
  • Power Button With LED status ring
  • Freq In SMA
  • 1PPS Out SMA
Rear Panel
  • DC Power Input 30W (12V 2.5A) barrel jack
  • GNSS Antenna SMA
  • 10MHz Out SMA
  • Freq-A Out SMA (1Hz – 1GHz PT only)
  • Freq-B Out SMA (1Hz – 1GHz PT only)

Note: Only 1 RJ45 port is usable with the Precision Timing Lite version

Protocol Support

Comprehensive PTP & NTP Capabilities

A flexible timing endpoint for heterogeneous networks, with support spanning enterprise PTP, utility, broadcast, telecom, NTP, PPS and frequency distribution.

Default Profiles

  • Default E2E — IEEE 1588-2008
  • Default P2P — IEEE 1588-2008
  • Enterprise PTP — RFC 9760

Power Profiles

  • IEEE C37.238-2011
  • IEEE C37.238-2017
  • IEC/IEEE 61850-9-3 Power Utility
  • IEC 62439-3 L2P2P & L3E2E

Broadcast Profiles

  • SMPTE ST 2059-2
  • AES67 Media
  • IEEE 802.1AS

Telecom Profiles

  • ITU-T G.8265.1
  • ITU-T G.8275.1
  • ITU-T G.8275.2
  • TSN / AVB

PTP Versions

  • PTPv2.1
  • PTPv2 (IEEE 1588-2008)

Additional Protocols

  • NTP (Network Time Protocol)
  • PPS (1Hz pulse per second)
  • Frequency distribution (1Hz – 1GHz) (PT Only)

IEEE 1588 Clock Modes

Unicast Master
Multicast Master
Unicast Slave
Multicast Slave

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