OPTION DESCRIPTIONS
GPS OPTION 08GP 38-73VDC POWER SUPPLY
ASSEMBLY 55187
1.0 INTRODUCTION
This option takes a nominal input of 48V through a rear panel terminal strip and provides +5 and
±12 VDC to power the GPS Time Code and Frequency Generator. It also provides timing and
fault status relay closures.
Optionally it can provide the capability of measuring the frequency, phase angle, and elapsed
time offset of an externally applied fifty or sixty AC sine wave.
All input/outputs from Assembly 55187 are from a rear panel terminal strip TB1.
All input/outputs have metal oxide varistors for transient voltage suppression.
The pin assignments for TB1 are shown below (as viewed from the rear of the unit):
Figure One
TB1-1 TB1-12
Pin Assignments
TB1-1 DC In 1
TB1-2 DC In 1 Return
TB1-3 Chassis Ground
TB1-4 Fault Relay - Common Contact
TB1-5 Fault Relay - Normally Closed Contact
TB1-6 Timing Relay - Common Contact
TB1-7 Timing Relay - Normally Closed Contact
TB1-8 50/60Hz Measurement Input - HI
TB1-9 50/60Hz Measurement Input - LO
TB1-10 DC In 2 (optional)
TB1-11 DC In 2 Return (optional)
TB1-12 Chassis Ground (optional)
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) C-23
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