Wi-Fi – RED / ETSI / FCC

What Is Wi-Fi — RED?

Wi-Fi radio testing is a set of experiments in which a device in the IEEE 802.11 family is measured against relevant radio spectrum standards in terms of output power, power density, channel occupancy, spam and out-of-band emissions.

Purpose of Wi-Fi — RED

The aim is to verify that the device operates within permissible power and emission limits in unlicensed bands and meets the radio equipment requirements for market placement.

Which Products Is Wi-Fi — RED Applied To?

Wireless router and access points
Consumer electronics with Wi-Fi module
IoT devices
Laptops, tablets and phones

In Which Sectors Is Wi-Fi — RED Used?

TelecommunicationsElectronicsSoftwareCyber Security

Standards Related to Wi-Fi — RED

REDEU radio equipment directive test
ETSIEuropean telecommunications standards test
FCCUS radio and EMC regulations test

Wi-Fi — RED Conditions

Bantlar: 2.4 GHz ISM and 5 GHz / 6 GHz RLAN bands
Quantities measured: Equivalent isotropic radiated power (EIRP), power density, occupied bandwidth, unwanted transmissions
channel access: Compatible channel access mechanism and DFS when applicable in band
Test modu: The device is in continuous transmission or normal operating mode defined in the standard.

Equipment for Wi-Fi — RED

Semi-anechoic room and antenna positioning scheme
Spectrum analyzer and real-time power measurement system
Radio communication tester (channel and modulation check)
Calibrated antenna and attenuator set

Sample Requirements for Wi-Fi — RED

Device must be in final production configuration
Antenna type and gain must be documented
Channel and power should be fixed with the test software
Worst case configuration (highest power, widest bandwidth) should be tested

Duration of Wi-Fi — RED

Typically 1–3 weeks depending on number of tapes and configurations.

Wi-Fi — RED Procedure

1Device configuration and test modes are determined.
2Output power is measured in the lower, middle and upper channels.
3Power density and occupied bandwidth are measured.
4In-band and out-of-band unwanted broadcasts are scanned.
5Channel access and DFS behavior are attempted when applicable.
6The results are compared to standard limits.

Wi-Fi — RED Acceptance Criteria

Acceptance criteria are the limit values given by the applied standard for each measurement (power, power density, undesirable broadcast limits).

Evaluation of Results

The choice of worst-case configuration determines the outcome; If the highest power modulation and bandwidth combination is omitted, compliance is under-proven.

Wi-Fi — RED Report

Applied standards and their versions
Device and antenna description
Test modes and channel list
Result and limit for each measurement
Measurement uncertainty

Accreditation

EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.

Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.

Scope and authorisations

Related Regulations

Radio Equipment Directive 2014/53/EU (RED)
FCC Part 15

RF and Wireless Testing — What Does This Testing Field Cover?

The section below describes the field that the Wi-Fi test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.

RF and wireless testing shows that a device containing a radio uses the spectrum correctly and operates within the limits the relevant legislation allows. This family is a separate body of work from EMC: EMC addresses unwanted interference, whereas here INTENTIONAL emission is assessed.

Spectrum is a public and limited resource, and this determines the legal character of the field. A device spilling outside its permitted band or emitting excess power is not merely a technical defect but a violation that disrupts someone else's service. Radio conformity is therefore policed more strictly than other test fields and markets maintain their own national regimes.

Measurements run separately on the transmitter and receiver sides. On the transmitter side, output power, occupied bandwidth, frequency error, unwanted emissions, adjacent channel power and the power envelope are measured. On the receiver side, sensitivity, selectivity, blocking and spurious response rejection are assessed. The receiver side is often neglected, but in some bands it is a regulatory requirement.

Access protocol specific behaviours are a third axis: listen before talk (LBT), duty cycle, dynamic frequency selection (DFS) and transmit power control (TPC). These mechanisms enable spectrum sharing and it must be shown that they work correctly.

HUMAN EXPOSURE is the fourth axis and one of the most commercially critical. For devices used close to the body, SAR (specific absorption rate) is measured; for devices used at a distance, a field strength assessment is made. Limits and measurement methods vary by market; the same device is assessed separately for Europe and the United States.

Market regimes are decisive in this family and do not substitute for one another: the Radio Equipment Directive and ETSI harmonised standards in Europe, FCC authorisation in the United States (through a TCB for intentional radiators), ISED in Canada, MIC in Japan, KC in South Korea and SRRC in China each carry their own set of requirements. The same device requires a separate file for each market, and some markets impose a local representative or local testing requirement.

Module integration is the subject that raises the most questions in the field. Using a certified radio module does not automatically make the device compliant. A module certificate is valid for a defined antenna, a defined supply and defined conditions of use; if the antenna changes, the layout changes or the module is operated at a different power level, reassessment is required.

The presence of several radios in the same device (Wi-Fi + Bluetooth + cellular + NFC) gives rise to a simultaneous transmission assessment: SAR and unwanted emission measurements are made for the worst case in which the radios operate together.

Method groups in this field

Transmitter measurements
Output power, occupied bandwidth, frequency error, unwanted emissions, adjacent channel power, power spectral density.
Receiver measurements
Sensitivity, selectivity, blocking, spurious response rejection.
Spectrum sharing mechanisms
Verification of listen before talk, duty cycle, dynamic frequency selection and transmit power control.
Human exposure
SAR measurement (handheld and body-worn devices), field strength assessment, multi-radio scenarios.
Protocol conformity
Cellular network conformity testing, Bluetooth and Wi-Fi certification testing, GNSS performance.
Antenna measurements
Gain, radiation pattern, efficiency and total radiated power (TRP) measurements.

Commonly confused in this field

Using a certified module does not automatically make the device compliant; if the antenna, layout or power level changes, reassessment is required.
An FCC file does not replace a CE file; each market operates its own regime.
Receiver side measurements are a regulatory requirement in some bands; measuring only the transmitter produces an incomplete file.
SAR limits and measurement methods differ by market; a result in one market does not carry over to another.
For devices carrying several radios the simultaneous transmission scenario must be assessed; measuring them individually is not sufficient.
Some markets impose local testing or a local representative requirement; technical conformity alone does not secure market access.

Which decisions these results support

Market access under radio equipment legislation
Verification of the antenna and RF front end design
SAR and RF exposure conformity
Verification of module integration and the scope of reassessment
Determining the worst case in multi-radio scenarios

Related Tests

Frequently Asked Questions About Wi-Fi — RED

Do I need to retest the product if the Wi-Fi module is certified?

The module certificate is not transferred directly to the product. At a minimum, radiated emission and EIRP measurements need to be repeated on the product when the antenna, housing and feed are changed; The module's integration guide determines the scope.