Master Clock

One Trusted Time Source for Your Entire Facility

A Master Clock is the central controller of a complete time-distribution system. It receives accurate time from a trusted reference, such as GNSS/GPS satellites or a network time source, and distributes that time to clocks, computers and other connected systems throughout a building or site. It ensures that every analogue clock, digital clock and network device displays and records the same accurate time.

From a small school with a few wall clocks to a hospital, airport, railway network or university campus with thousands of connected clocks, a Master Clock provides reliable and consistent time across the entire facility.

How a Master Clock Works

The Master Clock receives accurate time from an external reference and automatically distributes it using one or more time-synchronization methods. Depending on the system configuration, it can synchronize:

• Analogue wall clocks
• Digital clocks and displays
• Computers and servers
• CCTV systems
• Access control systems
• Building management systems
• Public-address and bell systems
• Industrial equipment
• Railway and transportation systems
• Other master clocks and time-distribution devices

The system continuously checks and corrects the connected clocks, preventing time drift and keeping every device synchronized.

More Than Just a Clock

A Master Clock is not simply a large wall clock. It is the central control unit responsible for receiving, managing and distributing accurate time across an entire organization.

Unlike a dedicated NTP Time Server, which mainly synchronizes devices over an IP network, a Master Clock can support both modern network-based systems and traditional clock installations. Depending on the model, supported time-distribution methods may include:

• NTP and SNTP
• DCF
• MOBALine
• Polarized impulses
• Serial time telegrams
• IRIG-B
• AFNOR

Selected network Master Clocks can also operate as high-capacity NTP servers, allowing one device to synchronize both facility clocks and IP-connected systems.

Why Accurate Time Matters

When clocks and systems show different times, it can create confusion and operational problems. For example:

• CCTV footage may not match access-control records
• Hospital departments may operate on different schedules
• School bells may activate at the wrong time
• Railway and airport displays may become inconsistent
• Maintenance teams may struggle to identify the correct sequence of events
• Building systems may activate earlier or later than expected

A Master Clock eliminates these problems by ensuring that all connected devices follow a single trusted source of time.

Key Benefits

• Consistent Time Everywhere – Every connected clock and system displays the same accurate time.
• Supports New and Existing Systems – A Master Clock can synchronize modern IP clocks together with traditional impulse, serial, DCF and MOBALine installations.
• Automatic Time Adjustment – The system can automatically manage daylight-saving changes, leap-year settings and scheduled time corrections where applicable.
• Reliable Facility Operations – Accurate time supports scheduled announcements, bells, shift changes, transport operations, security investigations and building automation.
• Centralized Management – The entire clock network can be configured and supervised from one central controller.
• Scalable Design – The system can support anything from a small installation to a large campus with thousands of connected clocks.

Master Clock Product Range

• DTS 4801 Master Clock – A network Master Clock with one configurable time-signal output. Suitable for smaller systems requiring NTP, DCF, serial telegram, MOBALine or polarized impulse distribution.
• DTS 4802 Master Clock – Provides two time-signal outputs for installations requiring additional distribution capacity or different synchronization methods.
• DTS 4803 Master Clock – A flexible network Master Clock supporting NTP, DCF, serial telegram, MOBALine, polarized impulses, IRIG-B and AFNOR. Suitable for complex and mission-critical applications.
• DTS 4806 Master Clock – Provides up to six time-signal outputs for larger facilities requiring multiple clock circuits or synchronization technologies.
• EuroTime Center ETC – A compact Master Clock for smaller facilities. It can support one or two time-signal outputs and is suitable for schools, commercial buildings and localized clock systems.
• HN 60/61 – A straightforward Master Clock designed for traditional polarized impulse clock systems.

Typical Applications

Master Clock systems are commonly used in:

• Schools and universities
• Hospitals and healthcare facilities
• Airports
• Railways and metro systems
• Commercial buildings
• Data centres
• Industrial facilities
• Government buildings
• Hotels and convention centres
• Power and utility facilities
• Marine and transportation environments

Why Choose SWS?

SWS – Smart World Synchronization provides complete Master Clock and time-synchronization solutions, from initial design through long-term maintenance. Our services include:

• System consultation and design
• Existing clock-system assessment
• Product selection and supply
• GNSS antenna installation
• Network and clock-circuit integration
• Installation and commissioning
• NTP and time-signal configuration
• Testing and synchronization verification
• System migration and replacement
• Preventive maintenance
• Fault diagnosis and repair
• Training and technical support

We can also help modernize older Master Clock installations while retaining compatible analogue and digital clocks where practical.

Need Help Selecting the Right Master Clock?

The correct Master Clock depends on the number of clocks, type of time signals, network requirements, redundancy needs and future expansion plans. Contact SWS for a system assessment and a Master Clock solution designed around your facility.