D-Link DCS-3511 User Manual page 43

Configuration
request transmission of the streaming data.
RTSP port /
RTP port for video, audio/
RTCP port for video, audio
 RTSP (Real-Time Streaming Protocol) controls the delivery of streaming media. By default, the port number is set to 554.
 The RTP (Real-time Transport Protocol) is used to deliver video and audio data to the clients. By default, the RTP port for video is set to 5556
and the RTP port for audio is set to 5558.
 The RTCP (Real-time Transport Control Protocol) allows the Network Camera to transmit the data by monitoring the Internet traffic volume. By
default, the RTCP port for video is set to 5557 and the RTCP port for audio is set to 5559.
The ports can be changed to values between 1025 and 65535. The RTP port must be an even number and the RTCP port is the RTP port number
plus one, and thus is always an odd number. When the RTP port changes, the RTCP port will change accordingly.
Multicast:Click the items to display the detailed configuration information. Select the Always multicast option to enable multicast for stream 1 ~
4.
Unicast video transmission delivers a stream through point-to-point transmission; multicast, on the other hand, sends a stream to the multicast
group address and allows multiple clients to acquire the stream at the same time by requesting a copy from the multicast group address.
Therefore, enabling multicast can effectively save network bandwidth.
Multicast RTP video, audio port/
Multicast RTCP video, audio port
The ports can be changed to values between 1025 and 65535. The multicast RTP port must be an even number and the multicast RTCP port
number is the multicast RTP port number plus one, and thus is always odd. When the multicast RTP port changes, the multicast RTCP port will
change accordingly.
Multicast TTL [1~255]: The multicast TTL (Time To Live) is the value that tells the router the range a packet can be forwarded.
D-Link DCS-3511/DCS-3530 User Manual 43