APPENDIX C
The specific pulse rate of each of the three outputs is individually selected by a 5 position DIP
switch.
Switch SW1 controls the pulse rate of Output 1.
Switch SW2 controls the pulse rate of Output 2.
Switch SW3 controls the pulse rate of Output 3.
Switch SW4 is not used in this configuration, however if installed, its switches need to be
“Open”.
The pulse rate selection for each of the outputs is the same and is shown in Table 2 on the next
page.
Switch position “Closed” means pushed down.
Switch position “Open” means pushed up.
TABLE 2
Pulse Rate Selection
(Typical of switches SW1, SW2 & SW3)
Switch Position Output Pulse
Rate
1 2 3 4 5
Closed Closed Closed Closed Open 1PPS
Open Closed Closed Closed Open 5PPS
Closed Open Closed Closed Open 10PPS
Open Open Closed Closed Open 20PPS
Closed Closed Open Closed Open 30PPS
Open Closed Open Closed Open 40PPS
Closed Open Open Closed Open 50PPS
Open Open Open Closed Open 60PPS
Closed Closed Closed Open Open 80PPS
Open Closed Closed Open Open 90PPS
Closed Open Closed Open Open 100PPS
Open Open Closed Open Open 120PPS
Closed Closed Open Open Open 180PPS
Open Closed Open Open Open 200PPS
Closed Open Open Open Open 240PPS
Open Open Open Open Open 500PPS
1.2 OUTPUT SPECIFICATIONS
Form Factor: Square Wave (50/50% duty cycle).
On-Time Edge: Rising edge.
Characteristics: TTL levels into 50 ohms.
ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
C-80
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