1 Introduction
1.1 Product Description
tīma GPS Master Clocks are specifically developed for application in protec-
tion, automation and control of power systems.
The master clocks provide GPS-derived synchronization signals in different
formats and protocols for use by, among others, protection relays, phasor-
measurement units, revenue meters, fault recorders and fault locators.
Signals can be distributed over a dedicated wiring (copper or fiber optic) or
using network-based protocols such as NTP/SNTP.
A bright dot matrix display on the front of the unit provides feedback to sub-
station personnel and allows for easy checking of correct configuration of time
zones and daylight saving times.
Status can also be monitored remotely using a web browser.
1.2 Key Features
• 60 ns (99%) maximum time deviation
• single or dual 10/100Base-T Ethernet
• RS232 and RS422/485 serial port with PPS output, supports most com-
monly used time strings
• timing signal generators for IRIG-B, PPS or PPM signals
• up to six additional outputs (isolated hi-power electrical or optical fiber)
• supports NTP/SNTP
• built-in SNMP agent, with trap generation
• dry contact for remote signaling
• antenna cable delay compensation
• user-configurable rules for daylight-saving-time (DST)
• leap second announcement
1.3 Firmware Versions
Information in this manual applies to firmware revisions 0125-xxx and later.
The firmware revision is displayed on the unit’s dot matrix display for a couple
of seconds immediately after power up.
The newest firmware versions and up-to-date versions of this document can
be downloaded from
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