Title :
A High-Precision Time Synchronization Algorithm Based on Selective Software Switch
Author :
Rui-Qing, Wu ; Qing-Shui, Gu ; Tian-Qi, Chen
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
In this paper, we present a selective time synchronization algorithm (STSA) based-on two selective switches using a hardware timestamp at a low-level layer to reduce time synchronization errors over Ethernet, and give the improved formula to calculate the time offset when considering the frequency offset factor in SNTP. The STSA transmits frame-based time synchronization frame on a truncated constant back-off collision resolution algorithm to reduce the delay jitter. This means the time accessing a shared Ethernet bus is more predictable. Experiment results indicate that the STSA achieves microsecond-level synchronization and a high synchronization success rate.
Keywords :
carrier sense multiple access; jitter; local area networks; synchronisation; CSMA-CD; Ethernet bus; back-off collision resolution algorithm; delay jitter; frame-based time synchronization; frequency offset factor; hardware timestamp; high-precision time synchronization algorithm; selective software switch; Clocks; Delay effects; Ethernet networks; Frequency synchronization; Hardware; Jitter; Multiaccess communication; Protocols; Software algorithms; Switches; CSMA/CD; Delay jitter; Hardware timestamp; Selective synchronization;
Conference_Titel :
Information Technology and Computer Science, 2009. ITCS 2009. International Conference on
Conference_Location :
Kiev
Print_ISBN :
978-0-7695-3688-0
DOI :
10.1109/ITCS.2009.223
