EVS XT2 - Xnet Performances & Troubleshooting

XT Series DISK RECORDER – Version 9 - Hardware Technical ReferenceIssue 5.00
EVS Broadcast Equipment SA – April 2008
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2.8.5 XNET PERFORMANCES & TROUBLESHOOTING
1. With the default settings, 10 real-time transfers can be achieved on the
network with standard definition pictures in normal conditions, and 3
real-time transfers with super motion pictures. Copy of a clip between 2
servers on the network can be made up to 5 times faster than real time,
depending on network occupancy.
With high definition pictures, these numbers are reduced to 3-4 real-
time transfers and copy clip 2 times faster than real time.
These performances are also limited by the disk bandwidth available
from the XT where the clips are stored. If the XT “owning” the clips is
doing multiple playbacks at the same time, freezes can occur on the
remote XT using those clips. Priority levels have been implemented to
maximize network bandwidth efficiency: PLAY requests have a higher
priority than SEARCH/BROWSE requests, which in turn have a higher
priority than COPY requests. Note that “Live” (E2E) mode on a remote
record train has the same priority level as a SEARCH/BROWSE request.
2. Note that when working at 1485Mbps or 540Mbps, only passive SDI
routing equipment may be used. The use of active SDI equipment should
be avoided, because they could cause additional line delays and prevent
the proper operation of XNet.
3. If the start-up of the network at a specific speed does not work properly
and all machines are apparently configured properly and the Multicam is
actually started on all of them, this can be due to the fact that the
selected cables to connect all XTs together are not suitable or too long
to operate at such a speed. You can decrease the speed of the SDTI
network on all machines and try working in this mode. The number of
simultaneous real-time transfers you can achieve is of course reduced.
4. While working at 1485 Mbps, if the connection cannot be established,
please make sure that all equipments are set to the same speed and
connected to the non-relay connectors. All equipments should be started
if not connected to an XHub.
5. It is recommended to use XHub if the network speed is set to 1485
Mbps.
6. Once the network has been established, if the system acting as the
network server is disconnected or shut down, another system will
automatically be assigned to act as a new network server. The switch is
automatic and seamless. The next machine to be automatically assigned
as new network server is the one with the highest serial number in the
SDTI network.