Dalsa C1240, User Manual

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260 • Technical Specifications Nano Series GigE Vision Camera
Ethernet Switch Requirements
When there is more than one device on the same network or a camera-to-PC separation greater
than 100 meters, an Ethernet (Gigabit) switch is required. Since the Genie Nano GigE camera
complies with the Internet Protocol, it should work with all standard Ethernet switches. However,
switches offer a range of functions and performance grades, so care must be taken to choose the
right switch for a particular application.
Note that in multi-camera setups using a Gigabit Ethernet switch, the Device Link Throughput may
need to be reduced so that each camera can equally share the available bandwidth. This feature
can be verified via CamExpert using the GigE Vision Transport Layer Control.
IEEE 802.3x Pause Frame Flow Control
Ethernet Switches supporting Full-duplex IEEE 802.3x Pause Frame Flow Control must be used in
situations where multiple cameras may be triggered simultaneously. In such a case the NIC
maximum bandwidth would be exceeded if there was no mechanism to temporarily hold back data
from cameras. Nano cameras support the IEEE 802.3x pause frame flow control protocol
automatically so that images from many cameras can be transmitted through the switch to the NIC
efficiently, without data loss. As a working example, one such switch tested at Teledyne DALSA is
the NETGEAR GS716T.
Important: The maximum frame rate possible from a large number of Nano cameras which are
simultaneously triggered will depend on the Nano model, frame size, and network details.
Note: Some Ethernet Switches may produce more Pause Frame requests than expected when Jumbo
Frames is enabled. Setting the Ethernet Packet Size to the default of 1500, may minimize Pause
Requests from such a switch and improve overall transfer bandwidth.
Ethernet to Fiber-Optic Interface Requirements
In cases of camera-to-PC separations of more than 100 meters but an Ethernet switch is not
desired, a fiber-optic media converter can be used. The FlexPoint GX from Omnitron Systems
( www.omnitron-systems.com ) converts GigE to fiber transmission and vice versa. It supports
multimode (MM) fiber over distances of up to 220 m (720 ft.) and single-mode (SM) fiber up to 65
km (40 mi.) with SC, MT-RJ, or LC connector types.
Important: The inclusion in this manual of GigE to fiber-optic converters does not guarantee they
will meet specific application requirements or performance. The user must evaluate any
supplemental Ethernet equipment.