EVS XT-3 Technical Reference Hardware Manual

Issue
10.05.D
XT3 Series DISK RECORDER – Version 10.05 - Hardware Technical Reference
EVS Broadcast Equipment SA – July 2011
24
To allow users to determine the best balance between picture quality, storage
capacity, number of video channels per server, and network speed, EVS XT3
servers can generate Avid DNxHD® files and streams at any given bitrate between
20Mbps and 220Mbps. These files and streams should remain compatible with Avid
production tools.
Apple ProRes 422 is also standardized at specific bitrates according to 3 profiles:
1. Apple ProRes 422 (also sometimes referred to as Apple ProRes 422 SQ):
120Mbps in “PAL” (50Hz) and 145Mbps in “NTSC” (59.94Hz)
2. Apple ProRes 422 HQ: 185Mbps in “PAL” (50Hz) and 220Mbps in “NTSC”
(59.94Hz)
3. Apple ProRes 422 LT: 85Mbps in “PAL” (50Hz) and 102Mbps in “NTSC”
(59.94Hz)
Apple ProRes 422 on EVS XT3 servers is only available at these bitrates.
CHOICES OF BITRATES WHEN USING AVID DNxHD® OR
APPLE PRORES 422 WITH EVS XT3 SERVERS
How to Read the Following Tables?
1. Video Bitrate: value set by the user in the advanced parameters window of
the XT3 server
2. Fields/Block: numbers of video fields that can be stored in one disk block of
8MB, taking into account 8 audio tracks.
3. Actual Bandwidth: this is the actual disk/network bandwidth that is required
for the real time record or real time playback of one video stream and its
associated audio tracks.
4. Max. RT Channels: this is the maximum number of video channels (real time
record or real time playback) that one XT3 server can support for a given
frame rate and bitrate. Since an XT3 server can have a maximum of 6 local
video channels, any value higher than 6 means that these additional real time
access can be used over the XNet2 SDTI network.
For mixed configuration with standard and super motion channels on the same
server, the following rule must be used to ensure that the settings do not
exceed the maximum bandwidth of the server : (nbr of standard channels x
their actual bandwidth) + (nbr of super motion channels x their actual
bandwidth) must be lower than or equal to 205 MB/s.
Example: Can I run an XT3 server with 2 records (1 super motion + 1
standard) + 2 play (1 super motion + 1 standard) in Avid DNxHD® with a video
bitrate of 100Mbps in “PAL” ?
Calculation: 1 standard rec/play at 100Mbps uses 13.3 MB/s ; 1 super motion
record/play at 100Mbps uses 40.0 MB/s; 2 x 13.3 + 2 x 40.0 = 126.6 MB/s.
Conclusion: this configuration is supported.
5. Network transfers: the maximum bandwidth over the XNet2 SDTI network is
approximately 110 MB/s. To determine the number of real time transfers that
can occur simultaneously over the network, this number must be divided by the
actual bandwidth given in the table for a selected bitrate.
Example: How many real time transfers can I do over an XNet2 SDTI network
(set at 1485Mbps) if I work with Apple ProRes 422 at 145Mbps in “NTSC” ?

EVS XT-3 Specifications

General

Brand	EVS
Model	XT-3
Category	Server
Language	English