3Com AirConnect 9550, Руководство пользователя

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Service 57
To avoid using an invalid NTP server address, this device will store
the fetched/configured time. After it boots up, it will use the
stored time first and adjust time if time is fetched.
Timezone selection This selection will adjust the time obtained from
the SNTP server.
Note: This selection does not affect manual time
input as they are considered to be input at the
same time.
Daylight Saving The start/end date of daylight saving will change
automatically based on the time zone selection.
Note: Start and End dates can be input manually,
to avoid any regional policy changes.
Primary and
Secondary SNTP
server/port setting If SNTP is enabled, this device will try to fetch
time from the primary server first. The timeout for
primary NTP server is 5 seconds.
If the Primary NTP server fails after 5 seconds the
Secondary NTP server will be tried for 5 seconds.
In the event that the secondary server fails, the
device will wait for 60 seconds before trying the
Primary server again. This continues until a time is
available.