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Displaying and resetting system time
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 87 of 135
Displaying and resetting system time
The system date and time for the Cisco TelePresence ISDN Gateway can be set manually or using
the Network Time Protocol (NTP).
To configure Time settings, go to Settings > Time.
System time
The current system date and time is displayed.
If you do not have NTP enabled and need to update the system date and/or time manually, type the
new values and click Change system time.
NTP
The ISDN Gateway supports the NTP protocol. Configure the settings using the table below for help,
and then click Update NTP settings.
The ISDN Gateway re-synchronizes with the NTP server via NTP every hour.
If there is a firewall between the ISDN Gateway and the NTP server, configure the firewall to allow
NTP traffic to UDP port 123.
If the NTP server is local to Port A or Port B then the ISDN Gateway will automatically use the
appropriate port to communicate with the NTP server. If the NTP server is not local, the ISDN
Gateway will use the port that is configured as the default gateway to communicate with the NTP
server, unless a specific IP route to the NTP server's network/IP address is specified. To configure the
default gateway or an IP route, go to Network > Routes.
Field
Field description Usage tips
Enable NTP
If selected, use of the NTP protocol is
Enabled on the ISDN Gateway.
UTC offset
The offset of the time zone that you are in
from Greenwich Mean Time.
You must update the offset manually
when the clocks go backwards or
forwards: the ISDN gateway does not
adjust for daylight saving
automatically.
NTP host
The IP address or hostname of the server
that is acting as the time keeper for the
network.
Using NTP over NAT (Network Address Translation)
If NAT is used between the ISDN Gateway and the NTP server, with the ISDN Gateway on the NAT's
local network (and not the NTP server), no extra configuration is required.
If NAT is used between the ISDN Gateway and the NTP server, with the NTP server on the NAT's
local network, then configure the NAT forwarding table to forward all data to UDP port 123 to the NTP
server.