User`s manual

VPort 2141 Video Encoder User’s Manual Troubleshooting
7-4
6. the level of your PC or notebook that is responsible for displaying images
In general, the transfer rate on a general local network environment can achieve over 200
Kbps, or approximately 10 to 20 pictures per second in a normal environment. The general
frame size is illustrated in the following table for your reference.
Quality setting Size of each frame Bandwidth demand for 30 fps
Medium 6.51 KB 1562 Kbps
Standard 6.69 KB 1606 Kbps
Good 9.29 KB 2230 Kbps
Detailed 14.28 KB 3427 Kbps
Excellent 24.24 KB 5818 Kbps
Q: How can I keep the VPort 2141 as private as possible?
A: The VPort 2141 is designed for surveillance purposes and has many flexible interfaces. The
user authentication and special confirmation during installation can keep the VPort 2141 from
unauthorized access. You may also change the HTTP port to a non-public number. You can
check the system log to examine any abnormal activities and trace the origins.
Q: I have a PTZ camera that is not on the support list. How can I control it?
A: The VPort 2141 provides a custom camera command interface to control cameras that are not
supported. The details are described in this manual. Be sure that the COM port settings are
applied to the camera specifications. The camera control cable included is shown in the
package contents. Prepare your own cable if necessary. The general PTZ command is
composed of one start command and one stop command. When editing both commands in the
edit box of the configuration page, use comma(s) to separate commands. Each comma
represents 200 milliseconds. If the user has some serial control device other than the PTZ
camera, the special URL is provided to send the desired commands. For quick access, integrate
the URL to another homepage on your own web server.
Q: Why can I see image files when I use dir in FTP even if the alarm is not triggered?
A: Every time the VPort 2141 starts, it will capture the images as vpre.jpg. If there are previously
saved image files that are not retrieved, the VPort 2141 will keep them until they are accessed.
Q: How will the stored images be processed if the VPort 2141 loses power?
A: If a user has defined the snapshot interval, the VPort 2141 will capture images periodically at
the pre-alarm stage. Once the pre-defined condition is matched, the pre-alarm images will be
kept and the current images will be saved. The subsequent images will be stored at the
post-alarm stage. Users may retrieve these files either by downloading by FTP, or by directing
the VPort 2141 to send the files by e-mail. This means that after monitoring conditions are met,
the VPort 2141 will keep these image files until user retrieval, even if power is lost.
Q: If I set the VPort 2141 to send e-mails of images whenever the conditions are met, will my
e-mail account overflow?
A: It is recommended to use a transient state instead of steady state. For instance, use ‘Input is
Rising’ and ‘Input is Falling’ rather than ‘Input is High’ and ‘Input is Low’ to let the condition
be triggered only when state is changing.
Q: The image is not clear enough. Is anything wrong?
A: The lens can be focused by rotating the outer ring. Rotate it clockwise or counter-clockwise to
focus near or far.