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IPTV Benefits

What is IPTV?

IPTV Technology

> Multicast and Standards

IPTV Standards

IPTV successfully combines two established technology standards:

MPEG compression

IP data addressing and transmission

IPTV system functionality makes use of a variety of IT standards:

IGMP and PIM - IP Multicast protocols for support of multicast streams

SAP: Session Announcement Protocol - to announce active IPTV channel streams to network display devices

SNMP: Simple Network Management Protocol - for monitoring and control of network-attached devices

POE: Power over Ethernet - to provide power across the network to IPTV receivers.


IPTV uses multicast to reduce network bandwidth. Multicast protocols ensure that channels are only
streamed to users that are actually viewing them.

Each channel stream is placed on the network just once, and the packets making up the stream are
replicated as necessary by the network switches. This minimizes data overhead on the network.

To further reduce use of bandwidth in the network, a channel stream is not passed on to network
switches that have no end-users viewing the stream. In the diagram below you can see that the
blue channel stream never reaches Switch D because there are no viewers of this stream on Switch D.

How Multicast minimizes the network data overhead

IPTV uses two main Multicast protocols:

IGMP - Internet Group Management Protocol - supports IPTV within individual VLAN's and Subnets

PIM - Protocol Independent Multicast - for routing IPTV streams between different VLAN's and Subnets.

Multicast protocols significantly reduce the network bandwidth needed for supporting video streaming.
It is this technology that makes IPTV network friendly.

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