1 Introduction & Designated Use
The OTMC 100 is an antenna-integrated GPS controlled time reference. It provides high-precision
time to synchronize intelligent electronic devices (IEDs), computers and measurement equipment in
Ethernet (TCP/IP) based networks. The OTMC 100 series products can be used as a PTP (Precision
Time Protocol) grandmaster clock according to the IEEE 1588-2008 standard and as an NTP
(Network Time Protocol) time server for NTPv4 compliant equipment according to RFC 5905.
The fields of application for the OTMC 100 series products include applications in industrial production
involving automatic test equipment (ATE), time critical banking and telecom applications as well as
protection and control applications in the electrical power industry. The OTMC 100 is the right choice
wherever accurate time in a computer based network is needed.
Due to the unique combination of GPS antenna, GPS receiver and time signal processing, the
OTMC 100 can be directly connected to Ethernet networks without the need of additional RF cable
installation.
The OTMC 100 series is designed for outdoor use in lightning protected areas. It is intended for fixed
installation on masts. For installation requirements, please refer to the Quick Start Guide provided with
the product or chapter "Mounting" on page 14.
The following OTMC 100 models are available:
OTMC 100i: Time reference for use in industrial applications supporting the IEEE 1588-2008 default
profiles.
OTMC 100p: Time reference for use in the electrical power industry. In addition to the
IEEE 1588-2008 default profiles, the OTMC 100palso supports the power profile according to
IEEE C37.238-2011 (IEEE Profile for Use of IEEE 1588-2008 Precision Time Protocol in Power
System Applications) specifically used in the electrical power industry.
For reasons of simplicity this manual uses the general term "OTMC 100" if the features and
functionality described are common for all products of the OTMC 100 series. The complete names
OTMC 100iand OTMC 100pare only used to indicate differences between the models.
The unique design of the OTMC 100 series offers many advantages:
• Web browser interface (called Web Interface) allowing for intuitive and straight forward setup and
control. The use of DHCP/Auto IP and the OMICRON Device Browser tool allows for easy remote
access to all functions and features from a computer.
• Outstanding precision. Synchronized to the GPS satellite navigation system, the OTMC 100's
internal clock achieves a time accuracy of +/- 100 ns to reference time (UTC).
• No need for rack space in server rooms due to outdoor mounting.
• Extremely low power consumption < 2 W.
• Full compliance with IEEE 1588-2008 (IEEE 1588 version 2).
• Easy installation. No additional power supply required through PoE (Power over Ethernet).
Introduction & Designated Use
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