3Com OfficeConnect Remote 812 Cli User's Manual page 77

If more than one OCR 812 is installed in your network, each OCR 812 is
assigned a different primary NTP server (the assignment of a primary NTP server
to a given OCR 812 is based on the unique MAC address of that OCR 812
unit).
To specify a secondary NTP server, use the following command:


set secondary_server <ip_name_or_addr>
<ip_name_or_addr> is the IP address or host name of the secondary server the
OCR 812 queries for date and time information/synchronization whenever the
primary server is unavailable.
The secondary server is randomly selected from a list of known NTP servers you
can access on the Internet at www.ntp.org. Many of these NTP servers can be
used free of charge. To view a sample list of NTP servers, please see
List.
If more than one OCR 812 is installed in your network, each OCR 812 is
assigned a different secondary NTP server (the assignment of a secondary NTP
server to a given OCR 812 is based on the unique MAC address of that OCR
812 unit).
To specify an NTP server polling interval, use the following command:


set polling_interval <seconds>
<seconds> is the polling interval used by the NTP process to gather time
synchronization information. The range available is 64 seconds to 1024
seconds (approximately 18 minutes).
The default polling interval is 600 seconds (10 minutes).
To specify an NTP server maximum retransmission value, use the following


command:
set retransmissions <number>
<number> is the maximum number of times a request will be re-transmitted to
a given server before the server is considered unavailable.
The value for <number> can be any value from 1 through 200, inclusive.
The default maximum value for <number> is five.
To specify an NTP server retransmission timeout value, use the following


command:
set timeout <seconds>
<seconds> is the number of seconds since a request was last sent to a server.
When elapsed time becomes greater than the value specified for <seconds>,
the request times out.
The value for <seconds> can be any value from 1 through 60, inclusive.
The default value for <seconds> is ten.
System Administration 6-41
NTP Servers