Vivotek IP3111/3121, Руководство пользователя

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specific network settings. Administrators should change the configuration according to what is given by
the service provider. The configuration may include " IP address ", " Subnet Mask ", " Default Router ",
" Primary DNS " and " Secondary DNS ". After changing network settings, be sure to leave " Reset
network at next boot " blank to skip installation when the system restarts. Otherwise the settings will be
erased.
Network Camera not only plays the role of server, it will also actively connect to servers outside to send
out messages or snapshots. When Network Camera starts, it will send out a system log to notify
administrators. Even in modem application, Network Camera will send out a connection log whenever it
dials out to an ISP or dialup server outside. If the administrator has setup some applications in either event
mode or sequential mode, Network Camera will send out snapshots once conditions are met. There are
two methods to send files, including e-mail and FTP. To ensure Network Camera sends out files correctly,
the administrator should set valid " SMTP (mail) Server " and " Recipient Email Address " as well as
" Primary FTP Server ", " Primary FTP Server ", " Primary FTP User Name " and " Primary FTP
Password ". “ Return email address ” is whom the mail will return when the SMTP server rejects upon
any failure. Some ISP may reject the mail if the address is invalid. " Primary FTP remote folder " is the
relative sub-folder in the remote FTP server.
In both methods, a " Secondary " server can be provided for backup connection. However the primary
server information should be entered first. If the primary server is not set, the related FTP or email will be
deactivated. Note that it may take time to connect to the secondary server after the first one fails and it
may affect some applications when conditions happen too often.
For security or network integration, administrators also can hide the server from the general HTTP port by
changing " HTTP Port " to other than 80 and known port numbers such as 21 and 23. These ports of
“ Control Channel Port ”, “ Audio Channel Port ” and “ Video Channel Port ” which are used in media
transmission can also be changed. Administrators should have enough acknowledge before changing the
default port.
If the Network Camera works in variation or low bandwidth (comparing with video bandwidth)
environment, the client side will receive the poor quality of media. For improving this situation, you can
check the “ Improve audio quality in low bandwidth environment ” item. It can make the audio quality