Installation & Operation Manual 266 Document # LTRT-92224
Mediant 8000
30.2 Using the EMS Server as the NTP Server
By default, the Media Gateway software uses the EMS server as a pre-configured
NTP server and consequently synchronizes it’s time and date with it. The EMS server
is pre-configured to operate as an NTP server and no additional configuration is
required.
Figure
30-1: EMS Server Configured as NTP Server
This configuration is suitable for basic lab deployments; however, the EMS server has
relatively low clock accuracy. Therefore for field deployments, it is strongly
recommended to use the external NTP server for time and date synchronization as
described in the following sections.
30.3 Using External NTP Servers
In the field deployments, it is recommended to use external NTP server(s) as a time
and date synchronization source for the Media Gateway and EMS server. For
redundancy purposes, it is recommended to configure at least two external NTP
servers.
If multiple external NTP servers are configured, make sure that all NTP servers derive
their clock from the same synchronization source or from the Stratum-0 server. For
example, in the figure below both NTP servers derive their clock from the same
Stratum-1 NTP server and thus meet this requirement.
There are two possible ways to set up working with external NTP servers. These
options are described in the following sections:
External NTP Servers Setup - Option 1 (see 'External NTP Servers Setup' -
Option 1' on page
267).
External NTP Servers Setup - Option 2 (see 'External NTP Servers Setup -
Option 2' on page
268).
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