KN22 Specification Title: Information technology equipment – Radio disturbance characteristics – Limits and methods of measurement
KN24 Specification Title: Information technology equipment – Immunity characteristics – Limits and methods of measurement
KN22 CISPR 22 and KN24 CISPR 24 are Korean specifications for information technology equipment (ITE). Note: CISPR is an acronym for Comité Internationale Spécial des Perturbations Radioelectrotechnique or “International Special Committee on Radio Interference” (Europe).
In addition to the commonly performed 30 MHz - 1000MHz radiated emissions test, like the newer version of CISPR 22, the Korean Communications Commission (KCC) requires that radiated emission measurements include high frequencies (above 1 GHz) by determining the highest internal frequency source being generated or used within the device.
Conducted common mode (asymmetric mode) measurements at telecommunication ports in the frequency range 150 kHz to 30 MHz are also a requirement, in addition to the AC line conducted within the same frequency range. The KN22 limits are the same as the CISPR 22 limits.
Information technology equipment (ITE), as would be tested for KN22/KN24, includes:
Central processing units (mainframes) and all related features and peripheral units, including processor storage, console devices, channel devices, etc.
Minicomputers, midrange computers, microcomputers and personal computers and all peripheral units associated with such computers; Special purpose systems including word processing, Magnetic Ink Character Recognition (MICR), Optical Character Recognition (OCR), photo composition, typesetting and electronic bookkeeping
Communication devices used for transmission of data such as: modems, data sets, mutiplexors, concentrators, routers, switches, local area networks, private branch exchanges, network control equipment, or microwave or satellite communications systems and
Input-output (peripheral) units (off-line or on-line) including: terminals, card readers, optical character readers, magnetic tape units, mass storage devices, card punches, printers, computer output to microform converters (COM), video display units, data entry devices, teletypes, teleprinters, plotters, scanners, or any device used as a terminal to a computer and control units for these devices.
The KCC (Korean Communications Commission) mark was merged into the KC (Korea Certification) mark as of January 24, 2011. All new products certified after that date must comply with the new marking and numbering scheme. For a previously certified product, a 6 month transition period was implemented, after which time the new logo was required (July 1, 2011), however this legacy equipment can still use the old certification number. Manufacturers that wished to change to the new number scheme were forced to cancel existing certifications and reapply for a new certification under the new rules.
Under the new process, there are three types of KCC approvals:
Compatibility Certification (similar to the former process)
Compatibility Registration (similar to the FCC TCB process)
Tentative Certification (similar to the CE DoC process)
Under the new KCC rule, the certification information, the KC logo and KCC certification number in particular, are required on both the product and the packaging.
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