Cambium Networks now supports reliable multicast delivery mechanism on the ePMP platform. This capability opens up opportunities for IPTV delivery services with full featured QoS support, reliable transmission mechanism and support of IGMPv3.
The ePMP system supports full featured IGMP snooping functionality similar to wired switches. IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a wireless system to listen to the IGMP conversation between an IPTV subscriber and an IPTV server. By listening to these conversations the system maintains a map of which wireless links need which IP multicast streams.
In order for IGMP snooping to work, a multicast router (IGMP Querier) must exist in the ePMP back-end network to generate IGMP queries. Without this IGMP Querier in the network, the appropriate tables for IGMP snooping support by the ePMP network are not created.
For more information on the ePMP implementation of IGMP snooping, see http://community.cambiumnetworks.com/t5/ePMP-Networking/ePMP-Multicast-IPTV-Streaming/m-p/38711#U38711 .