SECOND GENERATION LOW POWER DATA …

1 ARIB STD-T66. SECOND GENERATION LOW POWER data . communication system /. WIRELESS LAN system . ARIB STANDARD. VERSION ARIB STD-T66. Version December 14th 1999. Version March 28th 2002. Version March 26th 2003. Association of Radio Industries and Businesses (ARIB). General notes for the English version of the ARIB standard: The Association of Radio Industries and Businesses (ARIB) reserves all rights related to the duplication or distribution of these materials. The original SECOND - GENERATION Low- POWER data communication system /Wireless LAN. system ARIB standard Version (ARIB STD-T66) is written in Japanese and was approved by the 48th Standard Assembly Meeting of March 26, 2003. This document is the translation of that standard from Japanese into English.

2 In case of discrepancy or dispute, the Japanese text shall prevail. ARIB STD- STD-T66. Table of Standard Revisions STD Serial Number: ARIB STD-T66. Name of Standard: SECOND - GENERATION Low- POWER data communication system /Wireless LAN system Date established: December 14, 1999. <Note>. Related ministerial ordinances, announcements, etc.: Year 1999 ministerial ordinance No. 75 of MPT (Ministry of Posts and Telecommunications). (Partial revision of Radio Law Enforcement Regulations). Year 1999 ministerial ordinance No. 76 of MPT (Partial revision of Radio Equipment Regulations). Year 1999 announcement No. 757 of MPT. Revision Date of Contents of Revision Remarks Number Revision Determined at the 42nd March 28, 2002.

3 Standard Assembly Meeting The phrase and amateur To broaden coverage to radio stations was added interference affecting to the introduction. amateur radio stations In (1) a), the phrase and In line with the revision of orthogonal frequency Radio Equipment division multiplexing Regulations (RE) (Year systems was added; the 2002 ministerial phrase or a hybrid system ordinance [MO] No. 21 of combining FH and Ministry of Public orthogonal frequency Management, Home division multiplexing Affairs, Posts and systems (OFDM system ) Telecommunications was added to a). [MPHPT]). In (1) c), the phrase and In line with the revision of OFDM systems was added. RE (Year 2002 MO No. 21. of MPHPT).

4 In (2) a), the phrase or In line with the revision of hybrid systems of FH and RE (Year 2002 MO No. 21. OFDM was added. of MPHPT). ARIB STD- STD-T66. In (2) b), the phrase and In line with the revision of OFDM system was added. RE (Year 2002 MO No. 21. of MPHPT). In Fig. (1), the phrase or In line with the revision of a hybrid system combining RE (Year 2002 MO No. 21. FH and OFDM systems of MPHPT). was added. In Fig. (2), part of the In line with the revision of previous description was RE (Year 2002 MO No. 21. revised to An FH system , a of MPHPT) and for hybrid system combining clarification DS and FH systems, or a hybrid system combining FH and OFDM systems using the frequency band of 2,400 to lower than 2,427.

5 MHz or beyond 2, to 2, MHz.. In Fig. (3), the phrase or In line with the revision of OFDM system was added. RE (Year 2002 MO No. 21. of MPHPT). In (3), Note that they For clarification represent the tolerance for the maximum rated antenna POWER and that no upper and lower limits of the tolerance are regulated in the case of antenna POWER reduction for communications reasons.. was added. (6) was revised to In line with the revision of Permissible mean POWER of RE (Year 2002 MO No. 21. spurious emission of each of MPHPT). frequency supplied to a feeder, that is, mean POWER of spurious emission in the 1 MHz bandwidth at frequency f other than frequency band used shall be as follows.

6 In (7), the phrase or a In line with the revision of hybrid system combining RE (Year 2002 MO No. 21. FH and OFDM systems of MPHPT). was added. After (9), (10) was added In line with the revision of and subsequent paragraphs RE (Year 2002 MO No. 21. were renumbered of MPHPT). accordingly. ARIB STD- STD-T66. (11) was revised to In line with the revision of When a simple FH system RE (Year 2002 MO No. 21. (except hybrid system ) is of MPHPT). used, total frequency dwell time at an arbitrary frequency within the time period obtained by multiplying seconds by the process gain shall be seconds or less.. From (2), the phrase Because there is no need to When the frequency band limit the frequency of 2,427 - 2, MHz is used, was deleted.

7 In (2) a), was In line with the revision of revised to RE (Year 2002 MO No. 21. of MPHPT). (2) was revised to The In line with the revision of absolute gain of the RE (Year 2002 MO No. 21. transmitting antenna shall of MPHPT). be dB or less. However, when the equivalent isotropic radiated POWER (equivalent isotropic radiated POWER in the 1 MHz bandwidth in the case of spread spectrum and OFDM systems) is equal to or less than the value obtained by applying an antenna POWER with the mean POWER of 10 mW with its absolute gain being dB, the shortage shall be compensated for by the gain of the transmitting antenna (Note that mean POWER is 10 mW in the 1. MHz bandwidth in the case of spread spectrum and OFDM systems; however, mean POWER of 3 mW in the 1 MHz bandwidth is applied if the FH system , a hybrid system combining DS and FH systems, or a hybrid system combining FH and OFDM systems is employed and the frequency band of 2,427 - 2, MHz is used.

8 , all ARIB STD- STD-T66. of (2) is now designated as a). In (2), b) was added. In line with the revision of RE (Year 2002 MO No. 21. of MPHPT). in Annex 2 was revised to The frequency band was The purpose of these expanded to 2,400 - guidelines is to prevent 2, MHz. harmful interference with Interference affecting RFID systems (premises amateur radio stations radio stations and specified was also considered and low- POWER radio stations, harmful interference was both for RFID) operating in defined. the frequency band of 2,427. - 2, MHz and amateur radio stations operating in the frequency band of 2,400 - 2,450 MHz, with the ultimate goals of ensuring effective use of frequencies and improving convenience for users in the operation of SECOND - GENERATION low- POWER data communications systems radio stations operating in the frequency band of 2,400.

9 - 2, MHz. Note that harmful interference . refers to successive and serious interference to the function of other radio equipment (RL: Article 82).. In in Annex 2, those To allow broader (called experts in this application document) who design, manufacture, import, sell, set, or maintain the system was revised to those who manufacture, sell, install, operate, or maintain such systems (hereinafter experts).. ARIB STD- STD-T66. After (2) in Annex 2, the In consideration of RFID. phrases RFID equipment systems using specified using the frequency low- POWER radio stations hopping system for frequency hopping specified low- POWER radio systems, and amateur stations ARIB STD-T81, radio stations, and for and (5) Amateur radio clarification stations were added, and (3) became item (4); the frequency bands for the radio stations were added.

10 The frequency band of each For clarification radio equipment was appended to each item of in Annex 2. In (2) in Annex 2, For consistent terminology continuously interfere with other radio equipment to a great extent. was revised to harmful interference to other radio equipment.. In (3) in Annex 2, For consistent terminology interference to other radio equipment was revised to harmful interference to other radio equipment.. In (3) in Annex 2, For consistent terminology premises station was revised to premises radio station.. In the notes for in Annex To broaden coverage to 2, the phrases as well as interference affecting amateur radio stations amateur radio stations (radio stations requiring licenses), or amateur radio stations, and or amateur radio stations.