A.3 I/O Configuration 89
A.2.5 Acquisition
• 150 seconds typical, cold start
• 15 minutes, 90% confidence, cold start
• 40 seconds, with almanac less than one month old
• 15 seconds, with ephemeris less than 4 hours old
A.3 I/O Configuration
Any output signal, or the designated input, may be selected on specified connector by means of
internal push-on jumpers or special wiring. Each output connector is independently buffered.
A.3.1 I/O Connectors – Main Board
I/O connectors may be configured to any one of the output signals or a specific input function as
listed below:
• One as IRIG-B unmodulated or Programmable Pulse
• One as 1 PPS or Programmable Pulse
• One as IRIG-B, Modulated with Option 92
• One as Event Input with special wiring and JMP7 set. Can use IRIG-B modulated connector
if unused, or Option 95 with Model 1093A/B/C if Option board slot not used.
• RS-232 port(s) (standard or second), Auxiliary output at pin 4, Programmable Pulse output
or Event A input. Secondary RS-232 port available with Option 19.
A.3.2 Standard Output Signals
• IRIG-B: 1 kHz modulated (main board requires Option 92).
• IRIG-B: 5 V CMOS level-shift (unmodulated), 10-Ohm source impedance; ±75-mA drive.
• 1 PPS: 5 V CMOS, 10-Ohm source impedance; ±75-mA drive.
• IRIG-B, Modified Manchester: 5 V CMOS level-shift (unmodulated), 10-Ohm source
impedance; ±75-mA drive
A.3.3 Option 03, Four Additional Configurable Outputs
• IRIG-B: 1 kHz modulated, 10 Vpp (Option 9.
• IRIG-B: 5 V CMOS level-shift (unmodulated).
• 1 PPS: 5 V CMOS.
• Out of Lock: 5 V CMOS (HI = Locked, LO = Unlocked).
• Programmable Pulse, user-selectable: 5 V CMOS.
• CMOS outputs are buffer type (74HC126) with 10-Ohm source resistors.
A.3.4 Input Functions
• Event A or 1 PPS Deviation: 5 V TTL/CMOS.
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