CHAPTER TWO
PIN ASSIGNMENTS
TB1 Pin 1 AC High Input
TB1 Pin 2 AC Low Input
TB1 Pin 3 Chassis Ground
TB1 Pin 4 Fault Relay – Common Contact
TB1 Pin 5 Fault Relay – Normally Closed Contact
TB1 Pin 6 Timing Relay – Common Contact
TB1 Pin 7 Timing Relay – Normally Closed Contact
TB1 Pin 8 50/60Hz Measurement Input - High
TB1 Pin 9 50/60Hz Measurement Input - Low
This assembly has two relay closures to indicate timing/fault of the unit. The fault relay output
on the rear panel terminal strip TB1-4 and 5 will provide contact closure upon the following
conditions:
A processor error, Channel One error, or Channel Two error from the GPS receiver.
Loss of +5VDC.
If the DAC value goes below 300 or above 65,000.
The timing relay output on the rear panel terminal strip TB1-6 and 7 provides a contact closure
until the unit has achieved unit stabilization. For example, until the front panel LOCKED LED
illuminates.
If this unit is provided with a power supply other than the standard, its specifications will be
found in the Option Description envelope located on the inside cover of this User’s Guide.
2-4 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
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