COMPRO NC420, User Manual, Page: 46 / 80

Network Settings 6-10
Compro NC420 / NC450
RTP
If you want to broadcast video using RTP (Real-time Transport Protocol), you can set up the port range, video/
audio address and port number here.
QoS
QoS (Quality of Service) helps prioritize network traffic and reserve necessary bandwidth resource for critical
applications. Here you can customize the packet priority for different types of packet data (video/audio
stream, event/alarm, web page) by specifying a different value for the DSCP (Differentiated Services Code
Point) field in their IP packets. The DSCP value that represents the top priority is 46. The default DSCP value is 0,
which indicates normal priority (not using QoS).
The following is a table of the recommended DSCP values. The drop precendence indicates the order in
which IP packets shall be dropped when the network is congested. Packets of higher drop precendence will
be dropped first. Each class in the table is assigned a certain amount of network bandwidth.
Drop Precedence Class1 Class2 Class3 Class4
High drop precendence (3) 10 18 26 34
Medium drop precendence (2) 12 20 28 36
Low drop precendence (1) 14 22 30 38
Table 6-1. Recommended DSCP values
Note:
For the QoS function to work as it should, all the switches/routers in
your network environment must also support and enable QoS.