User manual

4.4. Network Transfers
4.4.1. XNet Transfers
Rule
This section provides figures on transfer speeds for jobs processed by the XNet (or SDTI)
network.
The section presents data in tables including the following parameters:
1. Field Rate: field frequency used, or number of video fields transferred per second.
2. Video Bitrate: codec bitrate set by the user in the Codec section of the Server tab in
the Multicam Configuration window.
3. RT Transfers: maximum number of simultaneous transfers of A/V data that can be
processed for the given frame rate and video bitrate through the SDTI network.
Calculation formula: Maximum SDTI bandwidth / Actual Bandwidth =
real-time transfers
4. Transfer Speed: transfer speed for a single transfer expressed in faster than-real time
speed. The calculation formula is the same as the RT transfers.
When A/V data is transferred through the XNet network, you should take into account the
maximum SDTI bandwidth of 110 MB/s.
When A/V data is backed up and restored to/from the XF2, smaller bandwidths have to be
taken into account.
Example
How many real time transfers can I do over an XNet network (set at 1485Mbps) if I work
with Apple ProRes 422 at 145Mbps in NTSC ?
Calculation: Maximum SDTI bandwidth / Actual Bandwidth = real time transfers
110MB/s / 18.4MB/s = 6 real time transfers.
This is the maximum real-time transfers the network connection can support.
It is obviously also necessary that the XS where the material is stored has enough local
disk bandwidth to feed the network accesses, on top of its own local channels (see Max.
RT Channels).
HARDWARE TECHNICAL REFERENCE MANUAL XS Server 11.02
4. Software Specifications 29