D-Link DVS-301 User Manual page 39

Building Networks for People
There are two settings for the client side. One is "Media Option". You can mute the audio by
checking this option. The other is "Protocol Option". You can choose the connection protocol
between client and server by this option. There are three protocols - UDP, TCP and HTTP.
When you choose UDP protocol, audio and video streams can be more real-time. But some
packets may be lost and decoding error will happen. If you select TCP protocol, packet loss isn't
occurred and decoder will run normally. But the real-time issue is worse than UDP protocol. If
your environment is behind the firewall and it opens HTTP port (80) only, you can select HTTP
protocol only. In this mode, audio will not be sent and you just can see the video only. If you
don't know which protocol you should choose, select the UDP protocol and the client will try
these protocols in this order, UDP → TCP → HTTP. After the client connects to the Video
Server successfully, "Protocol Option" will be set as the working protocol automatically.
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