Moxa VPORT 254-M-SC-T Instrukcja Użytkownika Pobierz pdf (Strona 90)

VPort 254 User’s Manual Frequently Asked Questions

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Q: How many users are allowed to access the video encoder at the same time?

A: Basically, there is no limitation. However the video quality also depends on the network.

To achieve the best effect, the VPort 254 video encoder will allow 8 video streams for

udp/tcp/http connections. We recommend using an additional web server that retrieves

images from the video encoder periodically if you need to host a large number of users.

Q: What is the video encoder’s video rate?

A: The MPEG4 codec can process 30 frames per second internally. However the total

performance is subject to many coefficients, as listed below:

1. Network throughput.

2. Bandwidth share.

3. Number of users.

4. More complicated objects result in larger image files.

5. The level of your PC or notebook that is responsible for displaying images.

In general, the transfer rate for a general local network environment can achieve over 800

kilobytes per second and approximately 10 to 20 pictures of a normal environment per second.

Q: How can I keep the video encoder as private as possible?

A: The video encoder is designed for surveillance purposes and has many flexible interfaces.

The user authentication and special confirmation when installing can keep the video

encoder from unauthorized access. You may also change the HTTP port to a non-public

number. 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 video encoder provides a custom camera command interface to control cameras that

are not supported. The details are described in this manual. Be sure that the PTZ port

settings are applied to the camera specifications. 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. In addition, the VPort has a PTZ driver upload function. Users can also

seek help from Moxa to create a new PTZ driver.

Q: How fast will the video encoder check the status of digital inputs?

A: The video encoder will check the input status in less than half a second.

Q: Why can’t I access the video encoder when I set up some options in the application?

A: When the video encoder is triggered by events, video and snapshots will take more time to

write to memory. If the events occur too often, the system will always be busy storing video

and images. We recommend using sequential mode or an external recorder program to

record motion pictures if the event is frequent. If you prefer to retrieve images by FTP, the

value could be smaller since an FTP server responds more quickly than a web server. Once

the system is too busy to configure, use the restore factory default and reset button to save

the system.

Q: The image is not clear enough. Is anything broken?

A: The lens can be focused by rotating the outer ring. Rotate it clockwise or counter-clockwise

to focus near or far.

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