Spectracom SecureSync User Reference Manual page 320

5.2 Time and Frequency Option Cards
Frequency Setting : 1KHz...10 MHz in 1Hz steps
1PPS Input Specifications
Input Impedance : 50 Ω
Minimum Pulse Width detected : 100 ns
Input Signal Jitter : <±500 ns t o achieve oscillator lock, <±50 ns to achieve system per-
formance
Programmable Phase Shift : ±5ns to 500 ms with 5ns resolution
1PPS Output Specifications
Signal Type And Connector : TTL level (BNC)
Output Load Impedance : 50 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
5.2.3.4 1PPS Input and Output: Viewing Signal State
To quickly view if the PPS inputs and outputs of this option card are currently enabled or disabled,
go to the option card's Status Summary panel. For instructions, see: "Viewing the Signal State of
an Input or Output" on page 291.
5.2.3.5 1PPS Input: Edit Window
To configure the settings for the 1PPS Input (also referred to as 'Reference'), go to its Edit win-
dow. For instructions, see: "Configuring the Settings of an Input or Output" on page 290.
The Web UI list entries for these cards are: 1PPS/Frequency BNC and 1PPS/Frequency RS-
485 . The connector number is: J2 (Model 1204-03: RS-485 connector: Pins 5 and 6)
304
NOTE – SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz out-
puts start at 1, because of the built-in outputs).
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5 SecureSync User Reference Guide Rev. 18