Spectracom SecureSync 1200 User Reference Manual page 377

Pin No. Signal
2 FREQIN_RS485+ RS-485 Frequency Input +
3 FREQIN_RS485-
4 GND
5 PPSIN_RS485+
6 PPSIN_RS485-
7 GND
8 PPSOUT_RS485+ RS-485 1PPS Output +
9 PPSOUT_RS485-
10 GND
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
Function
RS-485 Frequency Input –
Ground
RS-485 1PPS Input +
RS-485 1PPS Input –
Ground
RS-485 1PPS Output –
Ground
APPENDIX
361