VBrick Systems 7000 - Manual (Page 50)

44 © 2009 VBrick Systems, Inc.
Server Settings
The server settings defined here are used for all streams associated with a program.
Transmitters
A transmitter pushes the stream to a configured destination. The destination may be a single
endpoint in the case of a unicast, or multiple endpoints in the case of multicast. The
transmitter does not directly depend on a client to initiate the streaming but is always
transmitting (in the case of multicast) and transmits if the client is reachable and listening (in
the case of unicast). The streams are transmitted across the network via the RTP protocol
encapsulated in UDP. You can configure up to 25 transmitters per program. Each transmitter
can be configured for video and/or audio and the video and audio have
separately-configurable destination ports. An "announce" can also be enabled for each
transmitter.
SDP and Announcements
Decoders require knowledge of the stream from an .sdp file before it can be decoded. Each
SDP description contains critical stream information such as profile, bit rate, addressing,
transmission methods, and content. The decoder (for example StreamPlayer or QuickTime)
will examine this file for all necessary configuration information relating to the stream. Upon
Multicast Type of Service
(TOS) The TOS (Type of Service) can be configured in the IP
header to establish packet priority in the network.
Unicast Type of
Service (TOS) The TOS (Type of Service) can be configured in the IP
header to establish packet priority in the network.
Join Own Multicast Some network equipment requires that a Multicast source
(such as a VBrick encoder) join its own Multicast group.
This feature is enabled by default and has no adverse affect
on equipment that is fully Multicast-compliant.
Unicast Ping This parameter is used to instruct the VBrick to ping the
unicast destination periodically to test connectivity before
sending the stream. If Unicast Ping is not enabled, and the
destination goes offline, the unicast stream may be
broadcast to all destinations on the network, flooding the
network. Default = Enabled. This feature should only be
disabled if the network has a particular requirement that
makes it unworkable.
RTCP Client Timeout This is the number of seconds that the VBrick will wait before it
decides that an H.264 player that was playing its video or audio is
no longer viewing or listening. Zero means wait forever—no
timeout. 0–99999. Default = 60.
Time To Live (TTL) The number of hops (between routers) for which an IP packet is
valid on the network.
Type of Service (TOS) The TOS (Type of Service) can be configured in the IP header to
establish packet priority in the network. See Table 7 TOS Settings.