SNR S2989G-48TX [481/553] Chapter 9 network time management

S2989G-24TX Operation Manual

Chapter 9 Network Time Management Configuration

9-1

Chapter 9 Network Time Management

Configuration

9.1

SNTP

9.1.1

Introduction to SNTP

The Network Time Protocol (NTP) is widely used for clock synchronization for global

computers connected to the Internet. NTP can assess packet sending/receiving delay in

the network, and estimate the computer’s clock deviation independently, so as to achieve

high accuracy in network computer clocking. In most positions, NTP can provide accuracy

from 1 to 50ms according to the characteristics of the synchronization source and network

route.

Simple Network Time Protocol (SNTP) is the simplified version of NTP, removing the

complex algorithm of NTP. SNTP is used for hosts who do not require full NTP functions; it

is a subset of NTP. It is common practice to synchronize the clocks of several hosts in

local area network with other NTP hosts through the Internet, and use those hosts to

provide time synchronization service for other clients in LAN. The figure below depicts a

NTP/SNTP application network topology, where SNTP mainly works between second

level servers and various terminals since such scenarios do not require very high time

accuracy, and the accuracy of SNTP (1 to 50 ms) is usually sufficient for those services.