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Appendix B: Network Recommendations
89
AMX TDS (Television Delivery System)
Appendix B: Network Recommendations
Products Applicability
DTV-TX01-DVB-T
DTV-TX02-DVB-S
DTV-TX03-QAM-US
DTV-RX01-SD
DTV-RX02-HD
Introduction
This section provides network information for any installer or IT Network Manager planning on installing an
AMX Television Distribution System (TDS).
Introduction to AMX Television Distribution System
The AMX Television Distribution System (TDS) transmits digital TV content over Ethernet using a multi-cast
enabled LAN. A typical system consists of 1 or more ‘transmitter’ devices, that receive broadcast TV signals
and stream them over a network using multicast, 1 or more ‘receiver‘ devices that receive and convert
multicast video/audio signals into suitable signals for viewing on a television, finally an AMX NetLinx
controller with installed DTV Management Software is required for managing all TDS devices on the network.
The AMX NetLinx controller transmits a multicast beacon to discover TDS devices on the system and later
sends UDP packages to control and communicate with each device.
Network Considerations
Network Switches
The bandwidth capability of any network switches will depend on the number of audio/video channels being
transmitted over the network at any one time. Typically individual programs can range from 2Mbps for a low
quality video channel to greater than 10Mbps for a high definition video channel.
To determine the type of network switches required, an initial assessment of the total number of channels to be
streamed should be performed. Typically a gigabit Ethernet switch is required for any audio/video streaming
application. Although 100baseT ports to each device will typically be acceptable.
Any connections between switches should be a minimum of gigabit Ethernet.
Channel/Transport Stream Bandwidth
As noted above individual channels may have a data rate between 2M-10Mbps, but the channel may be
‘bundled’ with other channels from the same transport stream, depending on the configuration from the tuner/
transmitting devices.
Therefore when considering the data rate for each channel, also consider whether there are other channels
within the same transport stream which are broadcast on the same multicast IP, this could increase the data rate
to an individual receiver to above 30Mbps, depending on the number of channels streamed.
The DTV-TX01-DVBT and DTV-TX02-DVBS bundles all channels from each tuner into the same multicast
IP, whilst the DTV-TX03-QAM-US enables the user to either bundle channels or stream on individual
multicast IP’s.
IGMP
The TDS system broadcasts digital audio/video across a network using IP multicast. Therefore to prevent
network flooding, all network switches should have IGMP snooping enabled, with one switch configured as
the IGMP querier.
All switches should support Layer 2/3, IGMP snooping v2, flow control, jumbo frame and
multicast support.
For best results Layer 3 switches should be used.
Содержание TDS
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