AMX AV/IT Administrators Guide
Rev. 1.0 (7/29/2014) www.amx.com Page 20
Decoder: The STB-04 is an Amino H140 Set Top Box (STB) that ships with a firmware version
tested for compatibility with the Vision² system. The STB-04 will decode MPEG-2 and H.264
streams up to 720p. The STB-04 is capable of displaying live MPEG multicast streams as well as
playing Video on Demand of MPEG-2 and H.264 content when carried in a MPEG2-TS.
Vision2 streams can also be decoded on PCs and Tablets.
Video Streaming on IP Networks
RJ-45 connectors, 10Base-T, 100Base-TX, 1000Base-T
• IGMP Snooping V1 or V2 (Not router dependent for operation)
• IGMP Querier (One per Subnet)
• Spanning Tree Protocol (STP)
Layer 3 Services (if required)
•PIM Rendezvous point
• QoS
• Storm Control Broadcast and Multicast
There are two main ways that Vision2 servers and NMX encoders send data to decoders: multicast and
unicast.
Unicast: Unicast is a one-to one connection between the decoder and the source. Unicast uses IP
delivery methods such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), which
are session-based protocols. When a decoder connects using unicast to a Vision2 server, that client has
a direct relationship to the server. Each unicast client that connects to the server takes up additional
bandwidth. For example, if you have 10 clients all playing 1 Mbps streams, those clients as a group are
taking up 10 Mbps. If you have only one client playing the 1 Mbps stream, only 1 Mbps is being used.
Unicast is used in applications like video on demand from the Archive, or as reflected to an external
location over non-multicast networks. Due to the increased network consumption, it is not suitable for
applications where multiple viewers are receiving the same content simultaneously.
Since Unicast is widely understood it will not be discussed in depth in this document.
Multicast: Multicast is a one-to-one or more connection between multiple decoders and the source.
The multicast source relies on multicast-enabled routers to forward the packets to all client subnets that
have clients listening. There is no direct relationship between the decoders and the source, the decoders
subscribe to a multicast group and the network ensures delivery of the stream. Each client that listens to
the multicast adds no additional overhead on the server. The server sends out only one stream per
source. The same load is experienced on the source whether only one client or 1,000 clients are
listening.
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