User guide

Vario L2 General Precautions
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BIOS & CMOS Memory
Please be aware that with personal computer products, it is possible to create configurations within the CMOS
memory that make booting impossible. If this should happen, clear the CMOS settings; (see the description of the
Jumper Settings for details).
Electromagnetic Compatibility
This product meets the requirements of the European EMC Directive and its amending Directives, and the Low
Voltage Directive. It is eligible to bear the CE mark. However, because the unit can be installed in a wide variety
of situations, certain conditions have to be applied to ensure that the compatibility is maintained. Subject to those
conditions, it meets the requirements for an ITE Class A product.
The VARIO L2 must be supplied with a clean AC supply, and the chassis should be connected to a sound
earth (ground). As a minimum the power cord must be connected to an earthed (grounded) supply or outlet.
Any additional items installed or used with the Vario L2 should carry appropriate approvals
When installing additional items, any recommendations made by the component manufacturer/supplier must
be complied with regarding earthing and the installation.
The metal back plate of any expansion card must be securely screwed to the chassis of the computer to ensure
good metal-to-metal (i.e. earth) contact.
All connector bodies must be securely connected to the enclosure.
Most EMC problems are attributable to the cabling. It is recommended that screened cabling is used wherever
possible, and that the screen of the cable connects to the metal end bracket of the board or the enclosure and
hence to earth. Round, screened cables with a braided wire screen should be used in preference to those with a
foil screen and drain wire. Use metal connector shells that connect around the full circumference of the cable
screen: they are far superior to those that earth the screen by a simple “pig-tail” connection. This method
attempts to extend the enclosure around the connecting cables, thereby trying to surround the whole of the
internal equipment and external cabling.
The keyboard and mouse will play an important part in the compatibility of the processor card since they are
ports into the board. Similarly, they will affect the compatibility of the complete system. Fully compatible
peripherals must be used otherwise the complete system could be degraded. They may radiate or behave as if
keys/buttons are pressed when subject to interference. Under these circumstances it may be beneficial to add a
ferrite clamp on the leads as close as possible to the connector.
USB cables must be high quality screened types suitable for USB 2.0, and peripherals must be approved to
equivalent EMC standards.
Where possible ensure that the screens of any external cables are also bonded to a good RF earth at the remote
end of the cable.
Failure to observe these recommendations may invalidate the EMC compliance.