Time Distribution Model; How The S100 Works - Symmetricom SyncServer S100 User Manual

Time Distribution Model

Network time distribution systems use a hierarchical time distribution model, as shown in this
figure:
In hierarchical systems, primary time source clocks are Stratum 0 (zero), including GPS
satellites, National Institute of Standards and Technology (NIST) ACTS dial-up service, or
similar national time standards organizations.
The S100 acts as a Stratum 1 time server that derives its time from GPS and distributes this
time over a TCP/IP network using NTP. Stratum 2 NTP clients can distribute time to Stratum 3
computers.

How the S100 Works

The following describes how the S100 acquires and secures time.
S100 User Guide – Rev. D – June 2005
GPS
Satellites or
NMI Dial-Up
Service
Symmetricom
SyncServer
SyncServers
or Computer
Systems
(NTP Clients)
Computer
Systems
(NTP
Clients)
Figure 2-1: The S100 in the Time Distribution Hierarchy
2
3
5
9
1