Specifications

5 Menus and settings (continued)

English

5.3 Output settings (continued)

IPTV mode (SW option)

When selecting [IPTV output], there are settings for IP address and for Port

number. To be sure that the TS out on IPTV running stable over time, we

recommend not to exceed 38Mb/s as configured bitrate and that Output is set

to ASI output. After settings of IP address and port are made you click on the

[Start] button to start streaming

Following IP addresses can be used:

For UDP multicast: 239.0.0.1 to 239.255.255.254

For UDP unicast: Other IP adresses

For UDP broadcast: ALL IP addresses x.x.x.255

NOTE! To run IPTV the used switch must support IGMP Snooping.*)

*) IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP)

network traffic. IGMP snooping, as implied by the name, is a feature that allows a network

switch to listen in on the IGMP conversation between hosts and routers. By listening to these

conversations the switch maintains a map of which links need which IP multicast streams.

Multicasts may be filtered from the links which do not need them.

A switch will, by default, flood multicast traffic to all the ports in a broadcast domain (or the

VLAN equivalent). Multicast can cause unnecessary load on host devices by requiring them to

process packets they have not solicited. When purposefully exploited this is known as one

variation of a denial-of-service attack. IGMP snooping is designed to prevent hosts on a local

network from receiving traffic for a multicast group they have not explicitly joined. It provides

switches with a mechanism to prune multicast traffic from links that do not contain a multicast

listener (an IGMP client).

IGMP snooping allows a switch to only forward multicast traffic to the links that have solicited

them. Essentially, IGMP snooping is a layer 2 optimization for the layer 3 IGMP. IGMP snooping

takes place internally on switches and is not a protocol feature. Snooping is therefore especially

useful for bandwidth-intensive IP multicast applications such as IPTV.