2N Helios IP Configuration Manual v2.8 - Manual (Page 97)

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Synchronise – push the button to synchronise the intercom time value with your PC
time value.
Time zone – set the time zone for the installation site to define time shifts and
winter/summer time transitions.
Time zone rule – if the intercom is installed on a site that it not included in the
parameter, set the time zone rule manually. The rule is applied only Time zone
if the
parameter is set to . Time zone Manual
Use NTP server – enable the NTP server use for intercom time synchronisation.
NTP server address – set the IP address/domain name of the NTP server used
for your intercom time synchronisation.