Motorola MCP750 Installation And Use Manual page 136

For minimum RF emissions, it is essential that the conditions above be
implemented. Failure to do so could compromise the EMC compliance of
the equipment containing the module.
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Cable shields connected to earth ground via metal shell connectors
bonded to a conductive module front panel.
Conductive chassis rails connected to earth ground. This provides
the path for connecting shields to earth ground.
Front panel screws properly tightened.
EMC Compliance
A-3
A