Analysis Of Ip Multicast In The Internet Video Multicast In The Sense
For a computer network connection Video Monitoring system
, a problem to be solved is the number of video surveillance network sites Communicate Problems required to achieve transmission delay as small as possible, take up as little as possible the existing network bandwidth, and has a good number of large-scale site characteristics. Based on the analysis and comparison of unicast, Broadcasting And multicast based on the work, points out the use of technology for IP Multicast Network Video Multi-point real-time transmission, multi-point real-time monitoring network is of particular importance, and introduced the closely related with the multicast IP address format.
One, unicast, multicast, broadcast technology comparison
Multicast is considered to occur after the WWW technology to promote the most exciting web technologies. Multicast allows a sender to send one or more single data packet to multiple recipients of the network technology. Multicast source to send packets to a specific multicast group, and only belong to the multicast group address to receive the data packet. Multicast can greatly save network bandwidth, because no matter how many destination address, in any of the network links only send a single packet. Based on three types of communication network architecture and data transfer process works can be seen: the data channel. If a host to a very small amount of the recipient also transfer data normally without any problems. However, if a large number of hosts want a copy of the same packet Shique difficult to achieve. This will lead to the sender burden, long delay, network congestion; to guarantee quality of service require additional hardware and bandwidth.
Multicast (Multicast) transfer: it increases the data transfer efficiency. Reduce the possibility of backbone congestion occurs. Multicast group of hosts can be in the same physical network, you can also come from different physical network (if you have the support of multicast routers).
Radio (Broadcast) transmission: is the IP subnet broadcast packet, all hosts within the subnet will receive these packets.
Broadcast network meant to deliver a subnet hosts packets, regardless of whether these hosts willing to receive the packet. However, the use of radio is very small, only valid on the local subnet because routers will block radio communication. Radio transmission to increase the cost of non-recipients.
Currently, the most widely used multicast technology is IPMulticast. IP multicast technology is to optimize the use of network resources resulting from technology, often used for multi-mode applications work, it is the standard IP network-layer protocol technology, an extension.
In 1989 from Steve Deering proposed IETF's RFC1112 "Host Extension for IPMulticast" in the definition we can know: IP multicast core idea is?? Through an IP address to send data to a host (UDP packets ). The sender only sends messages to a group address, the receiver simply added to the group can receive information, all recipients receive the same data flow, the members of the group is dynamic, according to their wishes at any time by adding random or exit. Each host can also join multiple groups, each multicast address can be different in a different port or socket (Socket) on more than one data stream, while many applications can share a set of address. IP Multicast technology can avoid sending the possible broadcast storms, and can break through restrictions on the router will send packets to other network segment.
2, remote video network technology program analysis
Conventional point to point communication mode, N video site video transmission at least N-1 times to repeat sending the same packet delivery delay, but it also increased with the number of monitoring sites, time delay will rapidly growth. So, point to point communication, not suitable for large-scale requirements, short time delay multi-point video surveillance of the network transmission.
Analysis Of Ip Multicast In The Internet Video Multicast In The Sense
By: qoqo
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