Cisco Cisco TelePresence MCU 4510 Maintenance Manual

Enable
NTP

If selected, use of the NTP protocol is Enabled
on the MCU.

UTC
offset

The offset from the time zone that you are in
from Co-ordinated Universal Time (UTC). UTC
is in broad terms equivalent to Greenwich
Mean Time. The offset allows you to set a
local time appropriate to the geographic
location of the MCU and/or adjust for daylight
saving.

The offset can be -12:59 to 14:59 hours and can be set in
the format hh:mm (or -hh:mm for negative offsets) to
specify locations that vary from UTC in half hours. For
example, for Rangoon which is six and a half hours ahead
of UTC, the offset is 6:30. You do not need to enter the
minutes for whole hours, so an offset of one hour is 1.

You must update the offset manually when the clocks go
backwards or forwards: the MCU 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.

Note that square brackets are mandatory for IPv6
addresses.

Using NTP over NAT (Network Address Translation)

If NAT is used between the MCU and the NTP server, with the MCU on the NAT's local network (and not the NTP
server), no extra configuration is required.

If NAT is used between the MCU 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.