User`s manual

VPort 251 User’s Manual Accessing VPort 251’s Web-based Manager
Server Name
A server name can be assigned to each server. Administrators can change the name in System
Configuration/System/General. The maximum length of the sever name is 40 bytes.
Camera Image View
The assigned image description and system date/time will be displayed in the caption above the
image window. You may disable the caption or change the location of the image information from
the System Configuration/Video/Image Setting. Note that if the VPort’s motion detection
function is active, some windows in the video picture might be framed in red.
Audio Control
The VPort 251 provides both audio input and audio output for voice over IP communication.
Client users can directly enable and disable the audio input (a microphone, for example) by
clicking the microphone button, and audio output (a speaker, for example) by clicking the speaker
button from the VPort’s web homepage. You may also use the Client Setting to disable the audio
transmission.
Client Setting
Users can configure the following functions in Client Settings.
1. Media Options: Enable or disable the video or audio transmission.
2. Protocol Options: Choose one of four protocols to optimize your usage—UDP, TCP, HTTP,
or Multicast.
y UDP protocol can be used to produce audio and video streams that are more real-time. However,
some packets may be lost due to network burst traffic, and images may become blurred.
y TCP protocol can be used to prevent packet loss, which results in a more accurate video display.
The downside of using TCP is that the real-time effect is worse than with UDP protocol.
y HTTP protocol can be used to prevent being blocked by a router＇s firewall. The downside of
using HTTP is that the real-time effect is worse than with UDP protocol.
y Multicast protocol can be used to send a single video stream to multiple clients. In this case, a
lot of bandwidth can be saved since only one video stream is transmitted over the network.
However, the network gateway (e.g., a switch) must support multicast protocol (e.g., IGMP
snooping). Otherwise, the multicast video transmission will not be successful.
Once the video encoder is connected successfully, Protocol Options will indicate the selected
protocol. The selected protocol will be recorded on the user’s PC, and will be used for the next
connection.
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