VCS VIP 1000, Руководство пользователя

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Chapter 6 Configuring the Transmitter
VIP 10 / VIP 1000 59
Multicast settings
In addition to a "one on one" connection (unicast) between a transmitter and a
receiver, the VIP also supports multiple connections. With multicasting, several
receivers receive the video signal from the transmitter at the same time. There
are two methods for multiple connection: multi-unicast operation and multicast
operation.
In multi-unicast mode, the unit's data stream is duplicated and passed on to
multiple receivers.
Note
This places a heavy demand on the units' CPU that can lead to reductions
in image quality.
In multicast mode, duplication of the data stream takes place on the network itself
After duplication, the data is also then passed to multiple receivers.
Note
The prerequisite for multicast operation is a network enabled for
multicasting with the IGMP group management protocol and data transfer
via UDP.
Even with multiple connections, a transparent data connection can be
established only to a single device, usually the first receiver connected. However,
after about five seconds of inactivity, the data connection is automatically
suspended and another receiver can exchange transparent data with the
transmitter.
The audio link is likewise established only with a single receiver. It is also
generally maintained by the first receiver connected until that connection is
closed.