EVS XT-3 Technical Reference

4.3.3. Internal Bandwidth
General Description
This section helps you select the most appropriate bitrate for the native codec(s) on the
EVS server, on the basis of the internal bandwidth, the channel configuration, and the
calculated number of real-time channels at the EVS server level.
The section therefore presents tables including the following parameters:
1. Video Bitrate: codec bitrate set by the user in the Codec section of the Server tab in
the Multicam Configuration window.
2. Fields/Block: numbers of video fields that can be stored in one disk block of 8MB,
taking into account 8 audio tracks.
3. Actual Bandwidth: actual disk/network bandwidth required for the real-time record or
real-time playback of one video stream and its associated audio tracks.
4. Max. RT Channels: maximum number of video channels (real-time record or real-
time playback) that one EVS server can support for a given frame rate and bitrate.
Since an XT3 server can have a maximum of 68 local video channels, any value
higher than 68 means that these additional real-time accesses can be used for
transfers over the XNet (SDTI) network.
The RT Channels calculation is based on the use of Seagate disks of 300 GB (10K5)
configured in 4+1 raids. Such disks are able to write 300 MB/s.
Bandwidth and RT Channels at 50Hz (PAL)
Codec
Video
Bitrate
Fields
/Block
Actual
Bandwidth
Max. RT
Channels
Apple ProRes LT 85 Mbps 35 11.43 MB/s 26.24
Avid DNxHD®
HD MJPEG EVS/Standard
HD MPEG2 Intra
AVC Intra 100
DVCPro HD
100
Mbps
30 13.33 MB/s 22.50
Avid DNxHD®
Apple ProRes 422
120
Mbps
26 15.38 MB/s 19.50
Avid DNxHD®
Apple ProRes 422 HQ
185
Mbps
17 23.53 MB/s 12.75
20 4. Software Specifications
EVS Broadcast Equipment S.A. Issue 11.02.A July 2013

EVS XT-3 Specifications

General

Brand	EVS
Model	XT-3
Category	Server
Language	English