Spectracom SecureSync User Reference Manual page 310

5.2 Time and Frequency Option Cards
Figure 5-3:
5.2.1.4 Model 1204-21 1PPS Output (RS-485): Specifications
Inputs/Outputs: (4) 1PPS output
Signal Type and Connector: RS-485 (terminal block)
Output Load Impedance: 120 Ω
Rise Time to 90% of Level: <10 ns
Programmable Pulse Width: 100 ns to 900 ms with 20 ns resolution
Absolute Phase Error: ±50 ns (1σ)
Programmable Phase Shift: ±5ns to 500 ms with 5ns resolution
Maximum Number of Cards: 6
Ordering Information: 1204-21 1PPS RS-485 output module, terminal block
Figure 5-4:
Pin Assignments
Pin No.
1
2
3
4
5
6
294
Model 1204-19 option card rear plate
Model 1204-21 option card rear plate
Function
1PPS Output 1 +
1PPS Output 1 -
GND
1PPS Output 2 +
1PPS Output 2 -
1PPS Output 3 +
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5 SecureSync User Reference Guide Rev. 18