User Manual
Scion Tech
SC08.MX2000
10. Recommended Network Switches
Tel: +44 (0) 1635 862484
www.scion-tech.co.uk
Page 10
Product
Description
Netgear XS708E
8- Port 10G Switch Smart Managed
Netgear XS708T
8- Port 10G Switch Smart M 2 Combo
Netgear XS712T
12- Port 10G Switch Smart M 2 Combo
Netgear XS716T
12- Port 10G Switch Smart M 2 Combo
Netgear M4300-24X
24-Port 10G Switch Smart M 4 Combo
Netgear M4300-48X
48-Port 10G Switch Smart M 4 Combo
Netgear M4300-96X
96-Port 10G Switch Smart M 4 Combo
11. Network IGMP Snooping and Querier Explained
Internet Protocol (IP) multicast is a bandwidth-conserving mechanism for reducing data network traffic
by simultaneously delivering a single stream of information to thousands of recipients. Multicasting is
fundamental to the implementation of IPTV.
This is how it works.
In D
iagram 1
, none of the network switches have IGMP snooping or querying turned on and so the
network is not multicast enabled. The backbone switch has all the streaming traffic coming into it from
the IPTV Encoders. If we assume each stream is 4 Mbps the backbone switch will carry 4 Mbps x 3
streams = 12 Mbps of streaming traffic.
As the switches do not have IGMP turned on, the streaming traffic will flood the entire network
regardless of whether the user requests a particular stream or not.
Encoders
Core Switch
Switch 3
Switch 2
Switch 1
Decoders
Diagram 1
