Spectracom SecureSync 1200 - Page 377

Pin No. Signal Function
2 FREQIN_RS485+ RS-485 Frequency Input +
3 FREQIN_RS485- RS-485 Frequency Input –
4 GND Ground
5 PPSIN_RS485+ RS-485 1PPS Input +
6 PPSIN_RS485- RS-485 1PPS Input –
7 GND Ground
8 PPSOUT_RS485+ RS-485 1PPS Output +
9 PPSOUT_RS485- RS-485 1PPS Output –
10 GND Ground
Models 1204-01,-03: Input/Output Specifications
FREQ Input Specifications
Signal Type And Connector: Sine wave (BNC)
Detected Level: +13 dBm to -6dBm
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
SecureSync User Reference Guide 361
APPENDIX