Frequently Asked Questions About Synchronized Clocks

The accuracy of a synchronized clock depends on the time reference and synchronization technology used. Network-based clocks can receive time from an NTP or SNTP source, while GPS/GNSS systems can use satellite-referenced time.

The clock's displayed time also depends on the synchronization interval, network conditions, and the design of the clock system. For projects with specific accuracy requirements, the time source and required synchronization performance should be defined during system configuration.

A synchronized clock does not normally rely on a single manual time setting. It periodically receives updated timing information from its configured time source.

The actual synchronization interval depends on the clock model, synchronization technology, and system configuration. Network, wireless, GPS/GNSS, and master-slave systems can use different synchronization methods.

The behavior during a network interruption depends on the clock model and system configuration. A clock may continue displaying time using its internal timekeeping while the connection is unavailable, then resynchronize when communication with the time source is restored.

For projects where network interruptions are possible, the backup timekeeping requirements should be considered when selecting the clock configuration.

Yes, depending on the synchronization architecture.

A synchronized clock system does not necessarily require direct access to the public internet. For example, clocks can receive time from an internal NTP server, a local master clock, or a GPS/GNSS-based time source. The appropriate configuration depends on the available infrastructure and the required time reference.

Yes. Compatible network clocks can receive time from an existing NTP or SNTP infrastructure.

This can be useful for organizations that already manage time synchronization through their IT network. Before deployment, the network configuration, supported protocol, addressing requirements, and clock compatibility should be confirmed.

For more information about network-based synchronization, see our NTP clock technology resources.

Not necessarily.

Network clocks can use an existing compatible Ethernet infrastructure, while Wi-Fi clocks can use an existing wireless network. Other system architectures can use dedicated wireless communication, RS485 wiring, GPS/GNSS, or a master clock.

The appropriate communication method depends on the facility's existing infrastructure and installation requirements.

Yes. A compatible PoE clock can receive network connectivity and electrical power through the same Ethernet connection when connected to suitable Power over Ethernet infrastructure.

This can reduce the need for a separate power connection at each clock location. The available PoE standard, switch capacity, cabling, and clock requirements should be checked before installation.

Before installation, confirm the clock locations, viewing distances, available power, network or communication infrastructure, mounting conditions, and preferred time source.

For network-based systems, the network connection should be available at the planned clock locations. For wireless systems, coverage and communication conditions should be evaluated. Large or high-mounted displays may also require different clock sizes from those used in offices or small rooms.

Yes. Synchronized clock systems can be designed for retrofit installations as well as new construction projects.

Existing buildings may already have Ethernet, Wi-Fi, electrical power, or other communication infrastructure that can be incorporated into the project. Where new cabling is difficult, wireless or Wi-Fi configurations may provide additional installation flexibility.

Yes, when the selected clock is specifically configured for the intended outdoor environment.

Outdoor installations require consideration of environmental exposure, enclosure design, visibility, mounting position, power, and communication requirements. The clock configuration should be selected according to the actual installation conditions rather than treating an outdoor location as the same as an indoor installation.

It depends on the project architecture.

Different areas of a facility may have different infrastructure conditions, but all clock locations need to be designed so that their time references remain coordinated. In some projects, different clock configurations may be integrated within a broader synchronized timing architecture.

The compatibility between the selected technologies should be reviewed during system planning.

Yes. Clock size does not determine whether a clock can be synchronized.

A large digital clock may be installed in a production hall while smaller clocks are used in offices, classrooms, or corridors. The display configuration can be selected according to viewing distance and installation position while the clocks remain part of the same synchronized timing solution.

Digit height should be selected according to the viewing distance and installation position.

A clock mounted high in a factory, warehouse, terminal, or large public space may require larger digits than a clock installed inside an office or classroom. The expected viewing distance should therefore be considered before selecting the display configuration.

Yes, depending on the clock model and system configuration.

A project involving multiple time zones needs to define whether all clocks should display one common reference time or whether different locations should display their respective local times. The required time-zone configuration should be specified when planning the system.

Daylight saving time handling depends on the synchronization method, clock configuration, and time-source settings.

Network-based clocks can follow the applicable time settings provided through their configured system, while other configurations may use their own time-zone and daylight-saving settings. The required regional time rules should be confirmed when configuring clocks for the target market.

First check the clock's power supply and communication connection. For network-connected clocks, verify network connectivity and access to the configured time source. For wireless systems, check communication coverage and signal conditions.

If the other clocks remain synchronized while one clock does not, the issue may be specific to that clock's power, connection, configuration, or hardware. The clock model and system architecture should be reviewed before making changes to the entire system.

Possible causes include loss of communication with the time source, network configuration problems, insufficient wireless coverage, power interruptions, incorrect time settings, or a problem with an individual clock.

The troubleshooting approach depends on the synchronization technology. Checking the time source, communication path, power supply, and affected clock configuration is a practical starting point.

The purpose of an automated synchronized clock system is to reduce routine manual adjustment.

When clocks remain connected to their configured time source, they can receive updated timing information automatically. However, periodic inspection of the clock system, network infrastructure, power supply, and physical installation can still be appropriate for professional facilities.

Useful project information includes the number of clocks, number of buildings and floors, installation locations, approximate viewing distances, available Ethernet or Wi-Fi infrastructure, PoE availability, power supply, preferred time reference, indoor or outdoor installation, and display requirements.

Providing these details allows the clock configuration and synchronization architecture to be evaluated together instead of selecting individual clocks without considering the complete installation.

Start with the actual conditions of the installation.

Consider the number and location of clocks, viewing distance, available network and power infrastructure, preferred time source, building layout, indoor or outdoor environment, and whether the project may expand later.

Once these requirements are defined, the appropriate product type and synchronization architecture can be evaluated together. For projects with specific technical or customization requirements, HC Electronics can review the project information and discuss a suitable configuration.