NSa 4700 Online Regulatory Guide

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Technical Documentation > NSa 4700 Online Regulatory Guide > Electromagnetic Compatibility Information > Electromagnetic Compatibility

Electromagnetic Compatibility

Electromagnetic Interference (EMI) is any signal or emission, radiated in free space or conducted along power or signal leads, that endangers the functioning of radio navigation or other safety service or seriously degrades, obstructs, or repeatedly interrupts a licensed radio communications service. Radio communications services include but are not limited to AM/FM commercial broadcast, television, cellular services, radar, air-traffic control, pager, and Personal Communication Services (PCS). These licensed radio services, and unlicensed radio services, such as WLAN or Bluetooth, along with unintentional radiators such as digital devices, including computer systems, contribute to the electromagnetic environment.

Electromagnetic Compatibility (EMC) is the ability of items of electronic equipment to function properly together in the electronic environment. While this computer system has been designed and determined to be compliant with regulatory agency limits for EMI, there is no guarantee that interference will not occur in a particular installation.

SonicWall products are designed, tested, and classified for their intended electromagnetic environment. These electromagnetic environment classifications generally refer to the following harmonized definitions:

  • Class B products are intended for use in residential/domestic environments but may also be used in nonresidential/non-domestic environments.

    The residential/domestic environment is an environment where the use of broadcast radio and television receivers may be expected within a distance of 10 m from where this product is used.

  • Class A products are intended for use in non-residential/non-domestic environments. Class A products may also be utilized in residential/domestic environments but may cause interference and require the user to take adequate corrective measures.

If this equipment does cause interference with radio communications services, which can be determined by turning the equipment off and on, you are encouraged to try to correct the interference by one or more of the following measures:

  • Reorient the receiving antenna.

  • Relocate the computer with respect to the receiver.

  • Move the computer away from the receiver.

  • Plug the computer into a different outlet so that the computer and the receiver are on different branch circuits.

If necessary, consult a SonicWall Technical Support representative or an experienced radio/television or EMC technician for additional suggestions.

Information Technology Equipment (ITE), including peripherals, expansion cards, printers, input/output (I/O) devices, monitors, and so on, that are integrated into or connected to the system should match the electromagnetic environment classification of the computer system.

A Notice about Shielded Signal Cables: Use only shielded cables for connecting peripherals to any SonicWall device to reduce the possibility of interference with radio communications services. Using shielded cables ensures that you maintain the appropriate EMC classification for the intended environment. If you prefer, you can order a cable from SonicWall on the World Wide Web at https://www.sonicwall.com.

SonicWall has determined that this product is a Class A harmonized product. The following sections provide country-specific EMC/EMI or product safety information.

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