
About the Default Multicast Address
When multicast is chosen as the transport protocol, the VNM EC 200 assigns multicast IP
addresses automatically. Four schemes are available. Each scheme is designed to calculate
and assign a multicast address based on the IP address of an encoder device. This section
details how the default multicast address scheme operates.
The default multicast address scheme is used for all VN-Matrix systems. It creates at least
one and a maximum of four multicast addresses for each encoder. This is dependant on
how many stream elements are selected for transport. The last two octets in the derived
multicast address are derived from a standard 8-bit binary format. The table below details
how the IP address is derived.
Default Multicast Address Scheme
Address Type
Address Format
Description and Comments
VN-Matrix device
IP address
aaa.bbb.ccc.ddd
aaa.bbb.ccc.
is the subnet.
ddd
is a host number in the
range 1 to 254.
VN-Matrix device
subnet mask
255.255.255.0
Subnet mask set on all devices.
Derived multicast
address
239.192.bbbxxxyy.zzzzzzzz
b
represents bits 8, 7, and 6.
–
These bits are always 0.
x
represents bits 5, 4, and 3 and
is the channel number in the
range 0 to 4.
–
Encoders are always 0.
–
Recorder channels are 0 to 4
as appropriate.
y
represents bits 2 and 1 and is
the stream element number.
–
00 = audio
–
01 = video
–
10 = whiteboard
–
11 = data
z
represents the value of the
fourth octet in the host
IP address.
VNM EC 200 • Advanced Controller Configuration
34
Summary of Contents for VNM EC 200
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