EVS XT Series Technical Reference

XT Series DISK RECORDER - Technical Reference
EVS Broadcast Equipment SA - Nov 2005
Issue 3.0
26
3.8.4 STARTING XNET
1. When all above conditions are fulfilled, turn on all “Masters” and
“Clients” XTs, and make sure the Multicam application is started on
all of them. A message appears because they are looking for the
“Server” XT.
2. Turn on the “Server” XT and start the Multicam application. The
other XTs should see the “Server” arriving on the network and will
connect automatically. Connection takes a few seconds (usually
between 2 and 5 sec) for each XT.
3.8.5 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 to 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,
that 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 540Mbps, only passive SDI routing
equipment may be used. Even if the network is set to run at
270Mbps, 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 540Mbps 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 set all
XTs to work at 270Mbps and try working in this mode. The number
of simultaneous real-time transfers you can achieve at 270Mbps is
of course reduced.
4. 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.

EVS XT Series Specifications

General

Brand	EVS
Model	XT Series
Category	Computer Hardware
Language	English