In This Guide
Getting Started Guide ix
The 59551A GPS Measurements Synchronization
Module
The 59551A GPS Measurements Synchronization Module is a time
synchronizing source primarily focused on the power industry’s
transmission protection and control applications for wide-area
synchronization of the electric power transmission systems.
The Module provides highly accurate timing, and if a satellite signal is
lost the Module automatically switches to holdover mode that ensures
system synchronization for up to 24 hours with some loss of accuracy.
The module provides input/output connectors and ports for the
generation of appropriate synchronization signals for a variety of
transmission system requirements. Separate front and rear RS-232C
ports allow external computers to be connected to the Module for
analyzing data or entering commands without interrupting the output
signals. Available time tagging inputs allow recording of time of
occurrence of incoming edges (timestamping) for failure or
sequence-of-events analysis.
The standard 59551A has the following Input/Output connectors:
• two RS-232C serial communication ports (9-pin female rectangular
D subminiature on the front panel; 25-pin female rectangular
D subminiature on the rear panel)
• an IRIG-B output BNC
• a 1 PPS output BNC
• an Alarm BITE output
• an Antenna N-type connector
• three Time-tag input BNCs
• Power input jack
• Programmable Pulse output BNC
The front panel contains four Light-Emitting-Diode (LED) indicators to
indicate that power has been applied (Power), the module has tracked
and locked on to one or more GPS satellites (GPS Lock), the GPS
system is operating in holdover mode (Holdover), and an error or
invalid condition exists due to system fault or reduced accuracy of the
outputs (Alarm).
The 59551A has no front panel display or keypad entry. Information is
remotely entered into and retrieved from the 59551A using a personal
computer connected to the rear-panel 25-pin RS-232C port or the
front-panel 9-pin RS-232C port.
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