Vivotek Automobile Electronics Vivotek Automobile Electronics User Manual

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VIVOTEK
User's Manual - 73
Multicast settings for stream 1 ~ 3: Click the items to display the detailed configuration information.
Select the Always multicast option to enable multicast for stream 1 ~ 3.
Unicast video transmission delivers a stream through point-to-point transmission; multicast, on the other
hand, sends a stream to the multicast group address and allows multiple clients to acquire the stream at
the same time by requesting a copy from the multicast group address� Therefore, enabling multicast can
effectively save Internet bandwidth�
The port numbers can be changed to values between 1025 and 65535� The multicast RTP port must
be an even number and the multicast RTCP port number is the multicast RTP port number plus one,
and thus is always odd� When the multicast RTP port changes, the multicast RTCP port will change
accordingly�
If the multicast RTP video ports are incorrectly assigned, the following warning message will be
displayed:
Multicast TTL [1~255]: The multicast TTL (Time To Live) is the value that tells the router the range a
packet can be forwarded�
Initial TTL Scope
0 Restricted to the same host
1 Restricted to the same subnetwork
32 Restricted to the same site
64 Restricted to the same region
128 Restricted to the same continent
255 Unrestricted in scope

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