22
6 Configuration
Multicasting
Multicasting
Alongside the 1:1 connection
between one IPVS 600-... and one
software client (Unicast) each, the
IPVS 600-... also offers facility for
several software clients to receive
the video signal at the same time.
This takes place either by duplicating
the data stream in the IPVS 600-...
and subsequent distribution over
several software clients (multi-
unicasting) or by distribution of
an individual data flow in the
network itself to several recipients
in a defined group (multicasting).
For each IPVS 600-..., a separate
multicast address and the relevant
port must be configured each per
video link.
Note
The requirement for multicasting
operation is a network with
multicasting capability using the UDP
protocol and the IGMP protocol.
Other group management protocols
are not supported. The TCP
protocol does not support multicast
connections. The requirement for
multicast operation in a network
with multicasting capability is the
set-up of a special IP address (class
D address).
The network must support the
set-up of a group IP address and
the Internet Group Management
Protocol (IGMP V3). The address area
is 225.0.0.0 to 239.255.255.255.
The multicast address can be the
same for several IPVS 600-... units.
However, in this case it is necessary
to use a different port in each case
to ensure that several data streams
are not transmitted simultaneously
via the same port and the same
multicast address.
The following settings must be
performed separately in each
IPVS 600-... .
Multicast address video 1
For each IPVS 600-..., enter a
multicast address which you wish
to operate in the multicast mode
(duplication of the data streams
in the network). With the setting
0.0.0.0, the IPVS 600-... works in
the multi-unicast mode (copying
the data streams in the device).
The IPVS 600-... supports multi-
unicast connections for up to five
recipients connected simultaneously.
Duplication of the data in the device
requires high computing power and
can compromise image quality under
certain circumstances.
Port:
With simultaneous data streams
to the same multicast address, the
data streams must be assigned to
different ports.
Here, enter the relevant port
address.
Streaming
Click in the checkbox in order
to activate multicast streaming
operation for the relevant stream.
Activation is not necessary for
operation.
Multicast audio port 1
Alongside video data, audio
signals can also be transmitted
and received. Audio transmission
takes place in a separate data
stream in parallel to the video
data and so increases the network
load. The audio data is encoded in
accordance with G.711 and requires
an additional bandwidth of appr.
80 kBit/s per direction.
If audio signals have to be
transmitted in multicasting mode,
these must be assigned to their
own port as this is a separate data
stream. Here, enter the relevant port
address.
Audio signals are only transmitted
if the audio settings and audio
function are switched on in the
configuration.
Multicast package TTL
A value can be entered which
determines how long the multicast
data packages are active in the
network. If multicasting is operated
via a router, the value must be
greater than 1.
