Vivotek FD8154 User Manual download pdf (Page 70)

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70 - User's Manual

Multicast settings for stream 1 ~ 3: Click the items to display the detailed conguration 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 bandwith.

The ports 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

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 212 213

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Vivotek FD8154 User Manual Page 70