Technical Terms Glossary

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The Bureau International des Poids et Mesures (BIPM) has been founded by the "Meter Convention", signed by seventeen nations in Paris on 20 May 1875. It is located at Sèvres, near Paris, France…

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A

AFNOR NFS 87-500 is a standarized french time code similar to IRIG-B but contains additional day, day-of-month and year information. Unlike...

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B

The BeiDou Navigation Satellite System (BDS) is a Chinese satellite navigation system. Unlike the American GPS, Russian GLONASS, and European Galileo...

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The Bureau International des Poids et Mesures (BIPM) has been founded by the “Meter Convention”, signed by seventeen nations in Paris...

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Bootloader is a small programm which is executed as soon as the device is powered. It loads and executes the operating...

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In general, to broadcast is to cast or throw forth something in all directions at the same time. A radio or...

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C

CAT6 is a standardised twisted pair cable for Ethernet that is backward compatible with CAT5/5e and CAT3 cable standards. Like CAT5e,...

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Central European Summer Time (CEST), sometimes referred to as Central European Daylight Time (CEDT), is the standard clock time observed during the period of summer...

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Central European Time (CET) is a standard time which is 1 hour ahead of Coordinated Universal Time (UTC). It is used...

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Hospitals often use code names to alert their staff to an emergency or other event. … Code blue indicates a medical...

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the mechanical resonance of a vibrating crystal or piezoelectric material is used to create an electrical signal at a precise frequency....

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D

Daylight saving time (DST), also known as daylight savings time or daylight time (the United States and Canada), and summer time...

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DCF77 is a longwave time signal broadcast station at Mainflingen, Germany, about 25 km south-east of Frankfurt (50°01′ North, 09°00′ East)....

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The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on IP networks for automatically assigning IP addresses and...

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builder to mount a wide variety of control components, devices, terminal blocks, power supplies, etc. on the same rail.

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E

E1 (or E-1) is a European digital transmission format with a capacity of 2.048 Mbit/s from ITU-TS. It’s like the North...

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It is a spheroid (also called ellipsoid of revolution or rotational ellipsoid) whose minor axis (shorter diameter), which connects the geographical...

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RS-232C(EIA-232)/RS-422A/RS-485 areEIA (Electronic Industries Association) communication standards. Of these communication standards, RS-232C has been widely adopted in a variety of applications,...

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Elapsed time is the amount of time that passes from the start of an event to its finish.

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ITU-T G.811.1 outlines the requirements for enhanced primary reference clocks (ePRCs) suitable for frequency synchronization. These requirements apply under normal environmental...

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An ePRTC is an autonomous source of time that uses one or two co-located atomic clocks to provide the required performance...

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F

An optical fiber is a cylindrical dielectric waveguide (nonconducting waveguide) that transmits light along its axis through the process of total...

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G

Galileo is Europe’s Global Satellite Navigation System (GNSS), providing improved positioning and timing information with significant positive implications for many European...

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GLONASS (Russian GNSS) is a space-based global navigation satellite system (GNSS) that provides reliable positioning, navigation, and timing services to users...

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Greenwich Mean Time or GMT is the clock time at the Royal Observatory in Greenwich, London. Greenwich is located in England,...

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Global navigation satellite system (GNSS) is a general term describing any satellite constellation that provides positioning, navigation, and timing (PNT) services...

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The Global Positioning System (GPS) is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services. The U.S....

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A GPS Receiver is a L-band radio processor capable of solving the navigation equations in order to determine the user position,...

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The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the...

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H

Holdover is the period in which oscillator can sustain the same accuracy level of synchronised signal during loss of synchronisation.

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I

IEEE 1588 Precision Time Protocol (PTP) is a packet-based two-way communications protocol specifically designed to precisely synchronize distributed clocks to sub-microsecond...

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Impulse is a conventional two-wired system carrying polarized impulses 12 V, 24V or 48 V. This conventional two wired time distribution...

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IP is a protocol for routing and addressing packets of data. It allows them to travel across networks and arrive at...

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An IP (Internet Protocol) address is a numerical label assigned to the devices connected to a computer network that uses the...

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Inter-range instrumentation group timecodes, commonly known as IRIG timecode, are standard formats for transferring timing information.

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L

A LWL cable is a Fiber Optics cable/patch cord which are used widely in modern telecommunication and network technology. Mobatime devices...

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LWL module is a small form-factor pluggable (SFP), a compact hot-pluggable network interface module used for both telecommunication and data communications...

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M

A master clock is a precision clock that provides timing signals to synchronise slave clocks as part of a clock network.

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METAS is where Switzerland is at its most accurate. It is so to speak the guardian of measurement units in Switzerland....

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A miniature atomic clock offers improvements to temperature sensitivity and long-term drift, which correlate to longer holdover durations, compared to other...

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MOBALine is a two-wire transmission system for maintenance-free self-setting slave clocks and remotely synchronized computer-based systems. MOBALine sets the time of:...

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A multicast address is used to send a datagram to a set of hosts that can be on different subnetworks and...

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GNSS receivers making use of several available satellite systems, which provide global positioning service, are referred to as multi-constellation or Multi-GNSS...

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N

National Institute of Standards and Technology, is an agency in the United States for technology, measurements and standards. It was originally...

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National Marine Electronics Association, NMEA is a standard data format supported by all GPS manufacturers.

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The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. NTP...

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A NTP Server makes the current time available in a network using the Network Time Protocol.

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O

The OCXO, Oven Controlled Crystal Oscillator is able to provide exceedingly high levels of temperature stability.

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P

Power over Ethernet, or PoE, describes any of several standards or ad hoc systems that pass electric power along with data...

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A PoE injector connects your PoE-enabled network device to a non-PoE LAN switch port. More specifically, a PoE injector can be...

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A switch is a device that allows devices on a network to communicate. A PoE switch has the Power over Ethernet...

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PoE+ technology (IEEE 802.3at standard) is an upgrade of PoE technology. Similar to a PoE network switch, the PoE plus switch...

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Synchronization Pulse which is generated once per minute (PPM).

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A pulse per second (PPS or 1PPS) is an electrical signal that has a width of less than one second and...

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A typical PRC provides the reference signal for the timing or synchronization of other clocks within a network or section of...

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Parallel Redundancy Protocol (PRP) is a network protocol standard for Ethernet that provides seamless failover against failure of any network component....

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The primary reference time clock (PRTC) located in core centers provides reference time and phase synchronization signal traceable to a recognized...

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The Physikalisch-Technische Bundesanstalt (PTB) (Federal Standards Laboratory), Braunschweig and Berlin, is the nature and engineer-scientific agency and technical upper authority of...

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PTP, also known as IEEE 1588v2, is a packet-based technology that enables the operator to deliver synchronization services on packet-based mobile...

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A PTP-profile is a selection of optional features and attribute values. The purpose of a profile is to set restrictions on...

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R

Redundant link is an optical link between two mobatime PTP/NTP servers for redundancy. In this configuration they work out the master/slave...

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A serial port complying with the RS-232 standard (Electronic Industries Association EIA standard RS-232-C) was once a standard feature of many...

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RS-485 allows multiple devices (up to 32) to communicate at half-duplex on a single pair of wires, plus a ground wire...

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S

Slave clocks that are able to set their own time according to the reference signal

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Two time servers are used in redundant mode to icrease the availability and reach a high level of reliability

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A slave clock is a hardware device that typically depends on a master clock for accurate time. A number of slave...

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Simple Network Management Protocol (SNMP) is an Internet Standard protocol for collecting and organizing information about managed devices on IP networks...

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Simple Network Time Protocol (SNTP) is a simplified version of Network Time Protocol (NTP) that is used to synchronize computer clocks...

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A static IP address is simply an address that doesn’t change. Once your device is assigned a static IP address, that...

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Stratum tells us the quality of the reference clock: The Stratum model is a representation of the hierarchy of time servers...

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SyncE is a physical layer based synchronization implementation for packet networks requiring frequency synchronization. SyncE was standardized by the ITU-T, in...

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T

A TCXO (Temperature compensated crystal oscillator) is a crystal oscillator with a temperature-sensitive reactance circuit in its oscillation loop to compensate...

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A time server is a type of network server which transmits precise time information to its network clients, by using a...

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Time signal transmitters are used to transmit the time code in particullar area

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Time-Sensitive Networking refers to a set of IEEE 802 standards that make Ethernet deterministic by default. It is a new technology...

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U

In computer networking, unicast is a one-to-one transmission from one point in the network to another point; that is, one sender...

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Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time.

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W

Wi-Fi is a wireless networking technology that allows devices such as computers (laptops and desktops), mobile devices (smart phones and wearables),...

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