Grandmaster clock platform — modular, scalable, resilient PNT in a rack-ready chassis.
<120 ns
Rb Black+ 24 h
3 / 1RU
Density
1 Hz–1 GHz
Frequency output
Multi-band
GNSS + anti-spoof
Gallery
Open Time Appliance — front face
Open Time Appliance — front face
In the rack — three per 1RU
In the rack — three per 1RU
Rack deployment — 3 units per 1RU
Rack deployment — 3 units per 1RU
In the rack — angled view
In the rack — angled view
Front panel detail — GNSS and SFP ports
Front panel detail — GNSS and SFP ports
In the rack — rear connectivity
In the rack — rear connectivity
Rear connectivity — RJ45 and power
Rear connectivity — RJ45 and power
Interactive 3D
Drag to rotate the Open Time Appliance and explore the chassis from any angle — GNSS inputs, SFP ports, the oscillator bay and the three redundant timing modules.
Density by design
What it is
The Open Time Appliance is TimeBeat's flagship grandmaster. It combines the Open TimeCard's core timing engine with a full Ethernet switch, SFP and RJ45 output options, and a choice of three oscillator grades — from a 1.5 µs quartz DOCXO up to the elite Rubidium Black+ that drifts less than 120 nanoseconds over 24 hours. Three appliances fit in a single rack unit, and every one ships with anti-jam and anti-spoof protection at the GNSS front end.
Oscillator grades
Every appliance ships with the same chassis and GNSS front end — only the oscillator changes. Upgrade any time.
A Double-Oven Controlled Crystal Oscillator (DOCXO) — cost-effective tier where moderate holdover is acceptable and power budget is the primary constraint.
Atomic precision at a manageable power budget — the most popular choice for finance and telecom A/B/C grandmaster trios.
The highest-grade oscillator available. Selected for defence, national infrastructure, and networks where any holdover excursion is unacceptable.
Chosen your oscillator tier?
Tell us your holdover requirement and we'll confirm the right tier, pricing and lead time — within one business day.
Capabilities
3 / 1RU DENSITY
Redundant A/B/C grandmasters
SFP+ · RJ45 · SyncE
Full IEEE 1588 transparent clock
ANTI-JAM · ANTI-SPOOF
Multi-band GNSS integrity
Rubidium Black+ (<120 ns / 24 h) for elite long-haul performance, Rubidium Black (<500 ns / 24 h) for the balanced mid-tier, or Quartz DOCXO (±1.5 µs / 24 h) for cost-sensitive deployments.
Integrated Ethernet switch with SFP and RJ45 ports and SyncE client/server — distribute PTP to dozens of downstream slaves from a single appliance.
Multi-band, multi-constellation receiver with continuous integrity monitoring — built to survive the GNSS threat environment that modern networks have to operate in.
1 Hz to 1 GHz with differential LVDS and low phase noise — drive external rubidium ensembles, legacy 1PPS gear and lab references from one chassis.
The compact chassis means you can rack three independent grandmasters in a single rack unit — perfect for redundant A/B/C grandmaster trios.
Runs the TimeBeat Agent on standard Linux. Your own monitoring stack works day one — no vendor lock-in.
The TimeBeat software stack's jitter attenuation engine comes pre-configured. Filters network noise, asymmetric delay and oscillator phase noise from every timestamp — delivering a clean, stable clock signal with sub-nanosecond residual phase noise to downstream applications.
Specifications
Oscillator — Rubidium Black
Oscillator — Rubidium Black+
Oscillator — Quartz DOCXO
Network & interfaces
Where it works
Use case 01
Critical networks with time-sensitive requirements. Multi-band GNSS and Rubidium Black+ holdover keep cell sites and fronthaul synchronised through any outage.
Use case 02
Dependable, well-documented sync for MiFID II / CAT compliance. Three appliances in 1RU give you redundant A/B/C grandmasters in the space of a single competitor chassis.
Use case 03
National-defence communication networks need GNSS threat resilience. Anti-jam, anti-spoof, Rubidium holdover and open auditability at every layer.
Use case 04
Time-series data, interactive sports analytics and cloud-based mobile TV all need grandmaster-grade precision — delivered without filling a rack.
Free download
Full specs, block diagram and ordering information — emailed to you instantly.
Seen your deployment in one of these?
Get a quote tailored to your use case — volume, oscillator tier, engineering fit and lead time in one response.
In your network
1U rack grandmaster · up to 3 per chassis · < 30 ns to UTC · OSNMA-authenticated
Watch the demo
Hardware walkthrough, rack installation, and first synchronisation.
OCXO, Rubidium, Rubidium Black+ — how to match holdover grade to your network's GNSS outage budget, with three grandmasters per rack unit.
Standards & compliance
Get pricing
Tell us how many units, which oscillator tier, and where they’re going. We’ll come back with pricing, lead times, and any technical recommendations — within one business day.
Library
Product sheets, engineering guides, TCO models and blogs relevant to this hardware.
Why a single-grandmaster deployment is a DORA Article 11 problem, what A/B/C redundancy looks like in a single rack unit, and how the Open Time Appliance Shelf turns three independent Rubidium Black+ grandmasters — with independent GNSS antennas — into the default finance-venue topology for 2026 and beyond.
An engineering decision framework for picking oscillator tier on an Open Time Appliance. Drift maths that matter, real-world holdover scenarios, and where each tier is the right economic answer — not just the best spec sheet.
How the Timebeat Agent fuses GNSS, upstream PTP feeds, PPS inputs and oscillator discipline into a single weighted clock output — the same BIPM-style ensemble approach used to produce UTC itself, applied at the site level.
A virtual grandmaster clock is an IP endpoint that looks like a single PTP grandmaster to downstream clients but is backed by multiple physical Timebeat Agents — redundancy, capacity and failover at the topology level, with a single client-facing configuration.
What a PTP grandmaster clock actually does, how to choose one, and what separates a grandmaster you can trust from one that quietly drifts. Written by TimeBeat's engineering team for network architects deploying IEEE 1588 in production.
How precision timing actually works in 5G fronthaul networks — the time-error budget, the ITU-T accuracy classes, the role of G.8275.1, and what it takes to operate a fronthaul timing fabric without dropping calls or losing handovers. Written by TimeBeat's engineering team for mobile network operators and O-RAN integrators.
