ISO/IEC 21481-2021 pdf free

ISO/IEC 21481-2021 pdf free.Information technology – Telecommunications and information exchange between systems – N ear field communication interface and protocol 2 (NFCIP-2).
This document specifies the communication mode selection and switching mechanism, designed not
to disturb any ongoing communication at 13,56 MHz, for devices implementing ISO/IEC 18092, the
ISO/IEC 14443 or ISO/IEC 15693 series. The communication modes are specified in the respective
International Standards and are outside of the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 14443-2, Cards and security devices for personal identification — Contactless proximity objects — Part 2: Radio frequency power and signal interface
ISO/IEC 14443-3, Cards and security devices for personal identification — Contactless proximity objects — Part 3: Initialization and anticollision
ISO/I EC 14443-4, Cards and security devices for personal identification — Con tactless proximity objects — Part 4: Thansmission protocol
ISO/IEC 15693-2, Cards and security devices for personal identification — Contactiess vicinity objects — Part 2: Air interface and initialization
ISO/IEC 15693-3, Cards and security devices for personal identification — Contactiess vicinity objects — Part 3: Anticollision and transmission protocol
ISO/IEC 18092, Information technology — Telecommunications and information exchange between systems — Near Field Communication — Interface and Protocol (NFC1P-1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www,e1ectropediar
— ISO Online browsing platform: available at https://www.iso.org/obp
carrier frequency frequency of operating field
Note 1 to entry: fc shall be 13,56 MHz土7 kHz as specified in ISO/IEC 14443-2, ISO/IEC 15693-2 and ISO/IEC 18092.
Note 2 to entry: 13,56 MHz t 7 kHz is a frequency band allocated in Reference [2] for ISM applications.
7 External RF field detection
During external RF field detection, an NFCIP-2 device shall, for a period of TIDT + n x TRFW, detect external RF fields atfc with a value higher than HTHRESHOLD and shall not generate an RF field. TIDT, TRFW, n and HTHRESHOLD are specified in ISO/IEC 18092.
8 RF field generation
The NFCIP-2 device may only generate its RF field if it does not detect an external RF field as specified in Clause 7.
Figure 1 illustrates the RF field generation including the external RF field detection.ISO/IEC 21481 pdf free download.