Integration Guidelines Test Environment
10-7
Common mode chokes help pass the conducted emission requirements of the EN55022 for
frequencies below 30 Mhz. Metal cases or partial metal shielding inside the unit can also
help to reduce emission levels so that even more stringent standards can be passed.
CoBox-Mini Ethernet Integration
The AUI port connector doesn’t provide any DC decoupling transformer circuitry. The
customer must provide the necessary circuitry on the base board. Trace length from the
header to the transformer should be kept as short as possible. For additional AUI guidelines
please see also the transformer manufactures application notes.
CoBox-Mini100
Take care when laying out the trace for the RJ45. We recommend the use of shields
described in the "Network Connector" section above. On the optional 11 pin header for the
network connector, additional termination for the unused wires of the cable is provided to
improve the signal quality on longer lines.
CoBox-Micro
If the CoBox Micro is used with the on-board RJ45 connector, we suggest that you provide
ground level to the plated mounting hole near the RJ45. That shielded cable will be tight to
the appropriate level, however the virtual ground is also provided there.
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