User guide

Multicast RTP

This method uses a real-time variation of UDP (User Datagram Protocol), called RTP (Real-

time Transport Protocol). Multicast RTP allows a source to be displayed on any number of

displays.

VN-MATRIX VN-MATRIX

VN-MATRIX

(encoder) (decoder)

(decoder)

NETWORK

SOURCE DISPLAY

RTP

Encoder sends data using RTP

to a multicast group

Any number of decoders can be

part of the multicast group

Figure 5. Multicast RTP

The source encoder uses RTP to send data to a multicast group. The source encoder does

not need to know the IP address of any decoders that use that source.

RTP provides very low latency which is important for video transport. Unlike other

protocols, RTP packets include a timestamp. Therefore, if packets are received in the

wrong order they can easily be sorted into the correct order for display, or discarded if the

timestamp is out-of-date.

However, because RTP is a connectionless protocol, data delivery is not guaranteed. Where

data packets are lost (for example, due to excessive network traffic) the VNC 200 carefully

manages the data stream to minimize any image disruption.

Unicast RTP

Like multicast RTP, this method uses a real-time variation of UDP protocol, called RTP. This

method can be used where the network infrastructure does not support multicast traffic.

Unicast RTP should be used as a point-to-point configuration (that is, single source to

single display) but can be used for up to four displays.

VN-Matrix 200 Series • Introduction 6