Eurotech ZyWAN, Руководство пользователя

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ZyWAN - User Manual
86 110150-1001F
Time Synchronization
Select the method of synchronizing the internal clock of the ZyWAN. Available options are: None , GPS , and
NTP . The GPS option allows the time to be acquired from the GPS receiver (if installed). The NTP (Network
Time Protocol) updates the clock using NTP protocol from a network server. The following screen capture
shows the Table of NTP Servers table available if Time Synchronization is set to NTP .
The following table lists the buttons available.
BUTTON EXPLANATION
Insert Row# Each of the table rows is numbered. In order to insert a row in
the table, enter a number in the box between 1 and one greater
than the highest number of rows. Then click the Insert Row#
button to insert a blank row. This row needs to be filled in with
all data required.
Delete Row# In order to delete a row in the table, enter a number in the box
between 1 and the highest number of rows. Then click the
Delete Row# button to delete the row. Once a row is deleted, it
cannot be restored without inserting a row and entering the data
again.
Note:
If the clock is not retained after loss of power, it
may either be that the battery link on the main
circuit board is not fitted or that the coin cell battery
has failed and needs to be replaced.
The following table lists the fields available in Table of NTP Servers if Time Synchronization is set to NTP .
FIELD EXPLANATION
NTP Servers to Use
(IP address or FQDN)
Enter either the numeric address or named address (Fully
Qualified Domain Name, FQDN) of an NTP server to use for
synchronizing the system date and time. Insert additional rows
if more NTP servers are desired.
The best time server to use is one available on a local network,
if available. This avoids using public Internet resources and
gives more accurate time. The second best option is to use a
time server which is located on the Internet somewhere close
(small roundtrip time). Otherwise, some possible addresses are:
0.pool.ntp.org , 1.pool.ntp.org , and 2.pool.ntp.org (these
addresses point to three randomly assigned servers, which
change every hour), or simply pool.ntp.org .
After setting all the properties, click the Submit New Configuration button before switching to a new tab or
closing the window.