SMP 111 • Reference Information
95
NOTE:
IGMP multicast protocol is used by routers and switches to deliver streams to
subscribing endpoints. The SMP 111 delivers packets and frames onto the network
that are identified as multicast.
An IGMP multicast conserves network bandwidth because the SMP 111 will only
send data when a connection is made by a user. All network switches and routing
equipment must be properly configured to support IGMP snooping and IGMP query to
avoid flooding all endpoints with unnecessary streaming traffic.
Unicast Streaming Method — An Overview
This streaming method is used for on‑demand video with low latency and uses a variety
of streaming protocols. It can be used where the network infrastructure does not support
multicast traffic. Typically, unicast streaming is used for a point‑to‑point (one‑to‑one)
connection (SMP 111 to single viewing device), but can be configured to use multiple active
connections.
Unicast Push streaming can push exactly one (1) stream. Unicast Pull streaming can pull as
many streams as the SMP can handle. Unicast streaming can Push the data to individual
or multiple viewing devices, or it can use Pull streaming, where the SMP 111 waits for an
individual viewing device to request the stream before broadcasting.
SMP 111
(encoder)
Viewing
device
Viewing
device
Viewing
device
Viewing
device
NETWORK
1 to n
Device 1
Device 2
Device 3
Device
n
SMP 111 sends data to
specified devices.
Figure 68.
Unicast Streaming
NOTES:
•
When unicast streaming, the SMP 111 sends an individual stream to each viewing
device. This means that the total bandwidth increases as the number of actively
connected viewing devices increases and the total bandwidth decreases as the
number of actively connected viewing devices decreases.
•
In the figure above,
n
represents an unspecified number of additional streams.
figure 68
Содержание SMP 111
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