Users Manual – eco1050, eco2050, eco2150, eco4050, eco674, eco694, eco814
p. 16
transferring that amount of data as a net data stream over all its internal
components like network card, PCI bus and others. A PC with a dual core
Pentium D 3.0 GHz processor and an Intel PRO 1000 MT network card is an
example of a well equipped system.
NOTE: All SVS GigE cameras can also be operated with computers of less
performance than the camera delivers at highest frame rate. In this case the
maximal available framerate will be below the camera’s maximum. This is a
valid operating mode, however one has to be aware of the limits.
HINT: Notebooks are in most cases not capable to operate data
streams at the maximum level that SVS GigE cameras deliver. One has
to be aware that connecting a SVS GigE camera to an average notebook will
not allow for operating the camera at highest framerate but only on lower
framerates.
3.2.5
Multicast
When images from a single camera are to be delivered to multiple PCs the
usual way is to use multicast (RFC 2236). A switch receives an image data
stream from a camera and distributes it to multiple destinations in this mode.
Only MANAGED (intelligent) switches must be used. Otherwise
Multicast will not work.
Since a GigE camera always needs a single controlling application, there will be
only one master application. That controlling master application has to open a
camera in multicast mode (IP 232.x.x.x for local multicast groups) for allowing
other applications to connect to the same image data stream. Other
applications will become listeners to an existing image data stream. They will
not get control access to the camera, however their eventual packet resend
requests will be served in the same way as for the controlling application.
When using SVCapture as the controlling application, the “Multicast” checkbox
has to be checked in the Device Discovery dialog before opening a camera.
It is important to enter a suitable maximal packet size. This packet size is
determined as the minimum packet size from all intended listeners. When for
example all applications but one have jumbo frames adjusted to 16112 bytes
and the one application has jumbo frames adjusted to 9000 bytes then the
minimum (9000) has to be entered in the above shown dialog.
