Configure Ntp - Safran SecureSync 2400 User Manual

Table 2-5:
Message
ID
Message
Size
Seconds
NSec
EOM
It is also possible to use the System Time Message to send NMEA over UDP. For
more information about this functionality, see the
2.15

Configure NTP

Network Time Protocol (NTP) and Simple Network Time Protocol (SNTP) are
client-server protocols that are used to synchronize time on IP networks. NTP
provides greater accuracy and better error checking capabilities than SNTP does,
but requires more resources.
For many applications, it is not necessary to modify the NTP factory default con-
figuration settings. It is possible, however, to change most of the settings in order
to support specific NTP applications which may require a non- standard con-
figuration:
These features include MD5 authentication to block NTP access to parts of the
network and to broadcast NTP data to the network's broadcast address. NTP
and SNTP are used to synchronize time on any computer equipment compatible
with the Network Time Protocol. This includes Cisco routers and switches, UNIX
machines, and Windows machines with suitable clients. To synchronize a single
workstation, several freeware or shareware NTP clients are available on the Inter-
net. The software running on the PC determines whether NTP or SNTP is used.
When the NTP service is enabled, SecureSync will "listen" for NTP request mes-
sages from NTP clients on the network. When an NTP request packet is received,
SecureSync will send an NTP response time packet to the requesting client.
Under typical conditions, SecureSync can service several thousand NTP requests
per second without MD5 authentication enabled, and at a somewhat lower rate
with MD5 authentication enabled.
CHAPTER •
2 SecureSync 2400 User Manual Rev. 5.2
System Time Message field descriptions
Data
Data Description
Name
UID of the message; pro-
grammable
Total message size in bytes
Seconds since epoch
(00:00:00 Jan 1, 1970 UTC)
NSec within the current
second
End-of-message
Range Resolution
Unsigned 32 1
bit integer
Unsigned 32 1
bit integer
Unsigned 32 1
bit integer
Unsigned 32 1
bit integer
-1 1
NMEA over UDP App
2.15 Configure NTP
Units
n/a
Bytes
Seconds
nsec
n/a
Note.
113