D-Link DCS-6112 User Manual page 42

Configuration
Access name for stream 1 ~ 5: This camera supports multiple streams simultaneously. The access name is used to differentiate the streaming
source. If you want to use an RTSP player to access the camera, you have to set the video mode to H.264 / MPEG-4 and use the following RTSP
URL command to request transmission of the streaming data:
RTSP port /
RTP port for video, audio/
RTCP port for video, audio
ƒ RTSP (Real-Time Streaming Protocol) controls the delivery of streaming media. By default, the port number is set to 554.
ƒ 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.
ƒ 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:
Check the boxes to enable multicast for stream(s) 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.
When you enable multicast streams, the detailed configuration information will be displayed for each:
Multicast group address: Displays the Multicast group address for the enabled multicast stream.
Multicast video, audio port/ Multicast RTCP video, audio port: The port numbers can be changed to values between 1025 and 65535. The
first multicast port listed (RTP port) must be an even number, and the other multicast port number (RTCP) is the multicast RTP port number
plus one, and thus will always be an odd number. When the multicast RTP port changes, the corresponding 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-6112 /6113 User Manual 42