CSC-196 Time synchronization device for power system Manual
from close to open is for punctual edge;
b) 820 nm multimode ST fiber interface: time accuracy is better than 1us.
c) 1310 nm monomode SC fiber interface: time accuracy is better than 1us.
d) Differential interface: RS422/RS485 interface, time accuracy is better than 1us.
Pulse width: 105ms.
6) Serial port time message output
Message format: support the standard format of Specifications of time synchronization of
power system and Sifang’s format (Appendix D).
Message output time: output per entire second, entire minute and entire hour are
available.
Output baud rate: 1200, 2400, 4800, 9600 and 19200 bit/s are available.
Interface type: RS-232, RS-422/485, 820 nm multimode ST fiber interface, 1310 nm
monomode SC fiber interface.
The message frame header aligns the second pulse (1PPS) edge, with deviation less than
1ms.
7) IRIG-B output
IRIG-B（DC）
Type of time comparing code: IRIG-B（DC）.
Reference standard: Specifications of time synchronization of power system, be
compatible with IEEE C37.118-2005 (Appendix E).
Type of interface: RS-422/485, TTL, 820 nm multimode ST fiber interface and 1310 nm
monomode SC fiber interface.
Time accuracy: better than 1us.
IRIG-B（AC）
Type of time comparing code: IRIG-B（AC）。
Carrier frequency: 1 kHz；
Frequency jitter: ≤1% of carrier frequency；
Signal amplitude（peak to peak value）: the high amplitude is 3 V～12 V adjustable,
the typical value is 10V; the low amplitude meets requirement of modulation ratio 3 : 1～
6 : 1, the typical 3 : 1～6 : 1modulation ratio is 3:1;
Output impedance: 600 Ω, transformer buffered output;
Time accuracy of second punctual point: better than 20 μs；
Reference standard: Specifications of time synchronization of power system, be
compatible with IEEE C37.118-2005 (Appendix E).
8) SNTP network time comparing interface output
Type of interface: 10/100 M Ethernet RJ45 interface, physical isolation among different
net port.
