Spectracom TSync-PCIe - GPIO Inputs; GPIO Outputs; GNSS Receiver Specifications; Table 3-2: 1 PPS Output Specifications

TCXO OCXO
After 4 hours 12 μs 3 μs
After 24 hours 450 μs 100 μs
Table 3-2:
1PPS output specifications
3.10 GPIO Inputs
GPIO inputs to timing connector
50ns active pulse width minimum
50ns minimum between pulses
0V to +5.5V input range, +0.8V
VIL
, +2.0V
VIH
Input impedance <150pF capacitive
3.11 GPIO Outputs
GPIO outputs from timing connector
Pulse output: 50ns to 900ms active pulse width
Square wave output:
100ns to 20 second period
50ns to 900ms active pulse width
Amplitude: TTL compatible, 4.3V
min
, base-to-peak into 50ohms
3.12 GNSS Receiver Specifications
The following specifications apply to both internal, and external GNSS receivers:
Acquisition time: <4 minutes from a cold start
Re-acquisition time: <2 sec (90%)
Frequency:
GPS L1 (1575.42 MHz)
GLONASS L1 (1602 MHz)
Satellites tracked: up to 32 simultaneously
Sync to UTC: within ±15 ns to GPS/UTC (1 sigma) (stationary)
3.10 GPIO Inputs
CHAPTER 3 • Instruction Manual XYZ Rev. R
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