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©2021 Sharp NEC Display Solutions, Ltd. Page 69 of 86
12 Wireless connectivity installation and
configuration
This section is relevant only when using the DS1-IF21CE interface board together with a version of the
Compute Module 4 that has built-in wireless functionality. A wireless enabled Compute Module can easily
be identified by the silver-colored metal enclosure with engraved FCC and CE logos on the module.
Figure 12-1 Compute Module 4 with wireless functionality
The model of Interface Board is printed on the underside of the board.
Note: The DS1-IF20CE interface board is not certified for wireless operation and the Wi-Fi and
Bluetooth functions are disabled at the hardware level.
12.1 Important cautions
• The Compute Module, DS1-IF21CE interface board, and display are certified for use only with
the antenna provided in the kit. Using a different type of antenna will invalidate these
certifications and may be a violation of laws designed to prevent radio interference.
• Failure to correctly route the antenna coax and connectors as shown in this document may
cause unwanted interference and degraded performance. Please carefully follow the
instructions provided when installing the antenna components.
• The Compute Module, DS1-IF21CE interface board, and display are certified for use only in
certain countries and geographic regions. Use outside these areas may be in violation of local
laws.
• The U.FL type connectors are designed for a limited number of connections and disconnections.
Avoid repeated disconnections as much as possible.
• Do not make sharp bends or kinks to the antenna coax cable.
• Do not operate the wireless functions without the coax cable and external antenna attached to
the Compute Module.
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