3Com CommWorks 5210 - Manual (Page 29)

Synchronizing Network Time 29
Selecting Public NTP Servers
1 From any computer with internet access, access the following website:
http://www.eecis.udel.edu/~mills/ntp/clock1.htm
2 From the website, record the IP addresses for two separate active servers. One
is used as the primary NTP server, and the other is used as the secondary NTP
server. We recommend choosing NTP server locations that are as close to the
Media Gateway chassis as possible.
Setting the NTP
Parameters
Use NTP to synchronize the time across the network. The NTP parameters must
be set for the HiPer NMC card in each Media Gateway chassis, the
Gatekeepers, SIP Proxy Servers, and the Back-end Servers.
All Media Gateway chassis components are automatically synchronized
through the controlling HiPer NMC after it is configured for NTP.
Setting the NTP Parameters for the HiPer NMC
For the HiPer NMC card in each Media Gateway chassis, do the following:
1 Using IP Telephony Manager, open the Media Gateway chassis.
2 Select the HiPer NMC card.
3 Click Configuration, then Programmed Settings from the IP Telephony
Manager Console window.
4 Select Network Time Protocol from the Parameter Group drop-down list.
The Network Time Protocol windows appears.
Figure 2 Media Gateway Network Time Protocol Window