Netvue IPTV: Streaming TV, Video on Demand, and Digital Signage for your business

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What is IPTV?

IPTV Benefits

How IPTV works

> Multicast

IPTV Standards

IPTV successfully combines two established technology standards:

MPEG compression; and

IP data transmission.

IPTV systems use other IT standards such as:

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

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.

Multicast

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 the data overhead on the network.

To further reduce use of bandwidth in the network, a channel stream is not passed 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.

Because they significantly reduce the network bandwidth needed for supporting video streaming, multicast
protocols are the technology that makes IPTV network friendly.

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