APPENDIX C
1.2 GPS Option 27A - Output Connections - Assembly 55143
Pin 1 and Pin 2 of connectors J1 through J12 are the signal and the ground return pins,
respectively, for Options 27B and 27D.
Pin 1 and Pin 2 of connectors J1 through J12 are the “signal hi” and the “signal lo” pins
respectively for Option 27C.
Pin 1 of connector J1 through J12 is the uppermost pin and Pin 2 is the pin nearest to the PC
board.
1.3 GPS Option 27B - Analog Buffer - 50Ω Driver - Assembly 35001
This analog buffer plug in module is a gain of one amplifier capable of driving 50Ω. The output
amplitude is dependent on the input amplitude. Its frequency response is from DC to 10MHz.
1.4 GPS Option 27C - RS-422 Differential Buffer - Assembly 35028
This RS-422 buffer plug in module is a differential line driver with output levels of 0 to +5 volts.
It is a line driver for digital data transmission over balanced lines. It is designed to provide
unipolar differential drive to twisted-pair or parallel-wire transmission lines.
1.5 GPS Option 27D - Pulse Buffer - Assembly 35000
This pulse buffer plug in module outputs a 0 to +10 volt positive going signal. Dash numbers
determine the input on-time edge selection and pulse width.
Example:
35000-110 Triggers on input negative/falling edge. 20µs pulse
width.
35000-210 Triggers on input positive/rising edge. 20µs pulse
width.
ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
C-54
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