This is the recommended transport method for real time video and audio data over an
IP network. However, because RTP is a connection-less protocol, data delivery is not
guaranteed. Where data packets are lost (such as due to excessive network traffic), the
PURE3 algorithm carefully manages the data stream to minimize any image disruption.
NOTE: In figure 3, IP decoder 3 is designated as the system controller.
Unicast RTP
Like multicast RTP, the unicast RTP data transport method uses a real-time variation of the
UDP protocol that is connected as shown in figure 4. Unicast RTP differs from multicast RTP
in that it is a point-to-point protocol that uses a separate data stream for each decoded
display. The VN-Matrix 325 system can support up to four displays (decoders) from one
source (encoder), but such a configuration uses four separate data streams and results in
four times the network bit rate as a single display (decoder) configuration.
This method can be used in place of multicast RTP, when the network infrastructure does
not support or the local IT administration will not allow multicast traffic. Contact the system
administrator.
In figure 4, the four streams of data are identified as “RTP1” through “RTP4”.
System Control
System Control
Network
VN-MATRIX 325 SERIES
SERIAL DIGITAL VIDEO OVER IP
LAN-1
LAN-2
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ALARM
TEST
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VN-MATRIX 325 SERIES
SERIAL DIGITAL VIDEO OVER IP
LAN-1
LAN-2
STATUS
ALARM
TEST
VN-MATRIX 325 SERIES
SERIAL DIGITAL VIDEO OVER IP
LAN-1
LAN-2
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VN-MATRIX 325 SERIES
SERIAL DIGITAL VIDEO OVER IP
LAN-1
LAN-2
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SERIAL DIGITAL VIDEO OVER IP
VN-MATRIX 325 SERIES
SERIAL DIGITAL VIDEO OVER IP
LAN-1
LAN-2
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ALARM
TEST
IP Encoder IP Decoder 2
IP Decoder 1
IP Decoder 3
IP Decoder 4
RTP1 through RTP4
Program Data
RTP1
Program Data
RTP2
Program Data
RTP3
Program Data
RTP4
Program Data
Up to four decoders can
be part of the unicast RTP group.
Encoder Configured
as Controller
Figure 4. Typical Unicast RTP Application
As with multicast RTP, it is a connection-less protocol and data delivery is not guaranteed
Where data packets are lost (such as due to excessive network traffic), the PURE3 algorithm
carefully manages the data stream to minimize any image disruption.
NOTES: • In figure 4, the IP encoder is designated as the system controller.
• In unicast RTP mode, while the system supports up to 4 simultaneous
streams, the rate is dependant on the total aggregated bit rate, which must
not exceed 270 Mbs.
VN-Matrix 325 Serial Digital Over IP CODEC • Installation and Setup 9