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HTTP/2 301 date: Mon, 06 Oct 2025 16:58:37 GMT content-type: text/html content-length: 162 location: https://www.itmedia.co.jp/broadband/0301/24/lp15.html server: nginx strict-transport-security: max-age=31536000 HTTP/2 200 date: Mon, 06 Oct 2025 16:58:37 GMT content-type: text/html content-length: 8490 server: nginx vary: Accept-Encoding content-encoding: gzip vary: Accept-Encoding,User-Agent expires: Mon, 06 Oct 2025 17:13:37 GMT cache-control: max-age=900 strict-transport-security: max-age=31536000 accept-ranges: bytes ???r???O?{?F???悢??o?ꂵ??????????LAN?Z?p?uIEEE802.11g?v?̎??? (1/2)

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2003/01/24 22:10:00 ?X?V

Review?F?????R?̐V???i?uWBR-G54?v?i????i?j
???悢??o?ꂵ??????????LAN?Z?p?uIEEE802.11g?v?̎??? (1/2)

????LAN?̐V???ȓ`???K?i?ł???IEEE 802.11g?B?????͂₭?o?ꂵ???????R??802.11g?Ή????i???ҏW???ɓ͂????̂ŁA???ۂɐG??Ă݂邱?ƂɂȂ????B?ő?54Mbps?Ɩ??ł???Ă??邪?A???ۂ̂Ƃ???͂ǂ̂??炢?Ȃ̂??낤???H?@?܂??͋C?ɂȂ?̂̓X???[?v?b?g?????؂???

?@2003?N???A????LAN???߂???󋵂ɂ͕ω??????????????B1?́A??Intel???????ヂ?o?C??????CPU?ɍ̗p????V?Z?p?uCentrino?v?ɂ????āAIEEE 802.11a??IEEE 802.11b?̗??????̖???LAN?@?\???T?|?[?g???A?????ɑΉ??????m?[?gPC???i?̓o?ꂪ?\??????邱?ƁB???ꂩ?疳??LAN?̐V???ȓ`???K?i?ł???IEEE 802.11g?̕W?????????????A???????????i???o?ꂷ?邱?Ƃ??B

?@????IEEE 802.11g???????i?Ȃ̂????A???ɂ????????\?????????ł???B?܂??A?????̖???LAN?s??ɂ????čł??傫?ȃV?F?A???߂郁???R????삯??`??IEEE 802.11g???????i??2002?N12??12???ɔ??\?????B???̌?AIEEE 802.11b?o??̍ۂ??????͂₭AirMac?𓊓??????A?b?v?????A1??8????IEEE 802.11g?ɏ????????uAirMac Extreme?v?𔭕\?A2???܂łɔ???????Ƃ??Ă???B????ɃR???K???A1??21????IEEE 802.11g?ɑΉ?????????LAN???i?̔̔???3?????J?n????????\???Ă???B

?@?u???[?h?o???h???[?^?@?\?𓋍ڂ????uWBR-G54?v?i????i?j?B???ɂ?????݂ƂȂ????O??

?@???i?K?ł?IEEE 802.11g?????Ƃ????Ă??AIEEE 802.11g?̋K?i???̂͂܂??h???t?g?̒i?K?B???ۂɕW??????????????̂͂܂???????ɂȂ肻???Ȃ̂????A?e?ЂƂ????????F??Ƀt?@?[???E?F?A?̃o?[?W?????A?b?v?ɂĐ????Ή?????Ƃ??āA?V?K?i?̐??i?s??????????悤?ƁA????΁g???؂蔭?ԁh?̌`?Ő??i?????????????Ă???B

?@????ȂȂ??A?????͂₭?o?ꂵ???????R?̖???LAN???i???ҏW???ɓ͂????̂ŁA???ۂɐG??Ă݂邱?ƂɂȂ????B2002?N12????IEEE 802.11g??????CardBus?p????LAN?J?[?h?uWLI-CB-G54?v?ɉ????āA??ʌ????̃??C???i?b?v?ł???AirStation?̃A?N?Z?X?|?C???g???i?Ƃ??āuWLA-G54?v?A??ƌ?????AirStation Plus?̃A?N?Z?X?|?C???g?Ƃ??āuWLM2-G54?v?𔭕\???????Ђ????A????͂??????̂̓u???[?h?o???h???[?^?@?\?𓋍ڂ????uWBR-G54?v?B???????1??22???ɔ??\???ꂽ?΂???̂??̂??i?L???Q???j?B

?@IEEE 802.11b?????́uWLI-PCM-L11GP?v?i???j??IEEE 802.11g?????́uWLI-CB-G54?v?i?E?j?BCurdBus?Ή??ƃA???e?i???̑傫?????قȂ?

802.11b?ƌ݊???????????????LAN?K?i802.11g

?@???ۂ̐??i???Љ??O?ɁA?????ł?????ƁAIEEE 802.11?K?i?̂????炢?????Ă??????B???Ƃ??Ɩ???LAN?́A2.4GHz?т??g???A?ő??2Mbps?̓`?????x??????????Z?p?ł??????B???̕W???K?i??IEEE 802.11?ɂȂ?B1997?N?ɕW???????????????B???̌?A?`???Z?p?̉??P?ɂ?鍂???????͂????AIEEE 802.11b??1999?N?ɓo?ꂵ???B????͏]????802.11?Ɠ??l??2.4GHz?т??g???A?ő?11Mbps?̓`?????x????????????̂??B???ݍł????y???Ă??閳??LAN??????ł??邱?Ƃ͂????܂ł??Ȃ??B

?@????ɁA802.11b?Ɠ???????1999?N?ɕW???????s???A2001?N????萻?i???o?ꂵ???̂?IEEE 802.11a???B802.11a?́A?V???????g???тł???5.2GHz?т??g???A?ő??54Mbps?̓`?????x??????????B802.11b??11Mbps?Ƃ??????x?ł͖????ł??Ȃ??p?r?A??ɕi????v???????Ɨ??p?Ȃǂ̕???𒆐S?ɓ??????n?܂??Ă???B

?@???????A????LAN???????̊??҂?S???ēo?ꂵ??802.11a?ɂ͂??Ƃ??Ǝ?݂????????B802.11a??802.11b?Ƃ͌݊??????Ȃ??Ƃ??????Ƃ??B?????A????802.11b?𓱓????????Ə???ƒ낪?A?????Ȗ???LAN?𗘗p???悤?Ƃ????ꍇ?A?A?N?Z?X?|?C???g???A?_?v?^?ȂǑS?Ă̋@??????ւ??Ȃ???΂Ȃ?Ȃ??B

?@802.11a/802.11b?̌?ɕW???????n?܂????̂?IEEE 802.11g?B802.11g?́A802.11a?ō̗p???ꂽ?`???Z?p?ł???OFDM??2.4GHz?тɎ??????݁A2.4GHz?тł??ő?54Mbps?̓`?????x???????????????̂??B???̋K?i?œ??L???ׂ??|?C???g?́A?Ȃɂ?蕁?y?K?i?ł???IEEE 802.11b?Ƃ???ʌ݊????????????邱?Ƃ??Ƃ????邾?낤?B?܂?IEEE 802.11g?̋@??ł???΁A?ڑ??悪802.11b?ɂ?11Mbps?ŁA802.11g?ɂ?54Mbps?łƁA?ǂ???̖???LAN?ɂ??ڑ??ł???悤?ɂ????̂ł???B

	IEEE802.11b	IEEE802.11a	IEEE802.11g
?g?p???g????	2400-2497KHz	5150-5250KHz	2400-2484KHz
?`?????l????	14	4	13
?`?????x	11/5.5/2/1Mbps	54/48/36/24/18 /12/9/6Mbps	54/48/36/24/18/ 12/9/6Mbps
?`???Z?p	DS-SS?i?X?y?N?g?????g?U?E???ڊg?U?j????	OFDM?i???????g?????????d?j????
?A?N?Z?X????	CSMA/CA
?Í???	WEP
???O???p	??	?s??	??
802.11b?Ƃ̌݊???	?\	?Ȃ?	????
???i?o?ꎞ??	1999?N	2001?N	2003?N

?@802.11a??802.11g???ׂ??ꍇ?A??ʂɂ?802.11a?͋????͈͂?802.11g?????`?????????????Ƃ???Ă??邪?A?d?g?̓͂??????ɂ??Ă?802.11g?̂ق????D??Ă???Ƃ???Ă???B???O???p?ɂ??Ă??Ⴂ??????B802.11a?́A?????ɂ????ẮA????5GHz?т𗘗p???Ă???C?ۃ??[?_?[?ȂǂƂ̊???????邽?߂ɉ??O???p?͋֎~????Ă???B2.4GHz?тł???802.11b??802.11g?ɂ͂??̂悤?Ȑ????͂Ȃ??A???????낤?Ɖ??O???낤?Ǝg?p?ɖ??͂Ȃ??B???ۂɂ?5GHz?я?ł????O???p??F?߂铮???͂???A?????I?ɂ?802.11a?̃A?_?v?^?ł??Ή????}????Ǝv???邪?A?????̗??p?͒ʐM?T?[?r?X?Ɍ????A??ʂ̃??[?U?[??LAN?Ƃ??Đ??ӂɎg???Ă????Ƃ??????̂ł͂Ȃ??B

?@?܂??A802.11b??802.11g?ɂ͌݊????????邪?A?قȂ?Ƃ??낪?Ȃ??킯?ł͂Ȃ??B????͗??p?ł???`?????l???̐????B??????802.11b???i??14?`?????l???I???\?ł???̂ɑ΂??A802.11g???i?ł?13?`?????l???ƂȂ?B

?@?킸??1?`?????l???̈Ⴂ?????A?Ȃ??????Ȃ?̂?????????Ə????????Ȃ?B1998?N?ȑO?A???{?ł?2471?`2497KHz?𖳐?LAN?p?Ɋ??蓖?ĂĂ????B???̎??A???p?ł????`?????l??????1?`?????l???̂݁B???̌㖳??LAN?p?̎??g???т̌????????s???A???Ăɍ??킹??2400?`2483KHz???ǉ????ꂽ?B??????1?`13?`?????l???ɂ?????B??????802.11b???i?́A???Ƃ??Ǝg???Ă????@???ڑ?????K?v???l???A?]???̃`?????l????14?`?????l???ڂƂ??ăT?|?[?g???Ă???B?i???Ȃ݂ɁA?????̃A?N?Z?X?|?C???g??ݒu??????ł́A?????g?̏d??????????`??1?A6?A11?A14??4?`?????l?????g?????Ƃ?????LAN???p?́g?펯?h?Ƃ???Ă???j?B

?@?Ƃ??낪?A802.11g?̏ꍇ?A?ŏ????牢?Ăɍ??킹???d?l?ɂȂ??Ă???B???̂??ߎg?p??????g????2400?`2483KHz?Ƃ???A?????????Đݒ?ł???̂?1?`13?`?????l???ƂȂ?B802.11b?Ŏg???Ă???14?`?????l???͎g???Ȃ????߁A???????????g???Ă???802.11b?@???ڑ?????ۂ̓`?????l???̕ύX???K?v?ɂȂ?B?????Ƃ?????܂ł?802.11b?ł??C?O?d?l?̐??i?͓??l?ŁA???Ƃ??΃A?b?v????AirMac?Ȃǂ?13?`?????l???܂ł????g???Ȃ??????B

?@802.11a?A802.11b?A802.11g??3??????????????LAN?K?i?????A?Ⴂ??????̂͗??p??????g????`???Z?p?Ȃǂ̕????w?̕????݂̂??B????LAN?̃O???[?v???ʂ̐ݒ?ł???ESS-ID??A?Í????̐ݒ?ł???WEP?AMAC?A?h???X?ɂ??ڑ??????ȂǂƂ??????A????LAN?????ۂɎg????ł̋@?\?ʂɂ͕ω??͂Ȃ??B????܂Ŗ???LAN?ɂȂ??񂾐l?ł???Ό˘f?????Ƃ͂Ȃ????낤?B

?]????AirStation?ƕς??Ȃ????[?U?[?C???^?t?F?[?X

?@?Ƃ??????ƂŁA???ۂ̐??i?]???ɂ??????Ă݂悤?B????]?????????͎̂???@?łł???A???ۂ̐??i?Ƃ͈قȂ?\???????邱?Ƃ??ɖ??L???Ă????B

?@?܂??̓C???X?g?[?????B?N???C?A???g?A?_?v?^?̃C???X?g?[?????s???A?A?N?Z?X?|?C???g?^???[?^?̐ݒ???s???B?N???C?A???g?̃C???X?g?[?????ɁA?t????CD-ROM???g??AirStation?̃??[?e?B???e?B???C???X?g?[??????킯?????A?????͏]????AirStation?Œ񋟂???Ă?????̂ƌ???????ł͋??ʂ̂??̂ƂȂ?悤???B?܂??A?u???E?U?ōs???A?N?Z?X?|?C???g?^???[?^?̐ݒ???A?ݒ??ʂ?????????ł͏]????AirStation?̂??̂ƂȂ??ς??Ƃ???͂Ȃ??B

?@?]????AirStation?ƕς??Ȃ??ݒ??ʂ????A802.11g?̓??샂?[?h???u11g?i54M?j-Turbo?v?u11g?i54M?j/11b?i11M?j-Auto?v?u11g?i54M?j/11b?i11M?j-WiFi?i11b?j?v?u11b?i11M?j-WiFi?v??4?i?K?Ő؂芷??????

?@?????o?׎??ɂ?ESS-ID?͐??i??MAC?A?h???X?ɂȂ??Ă???B?N???C?A???g?A?_?v?^???C???X?g?[???????[???Łu?N???C?A???g?}?l?[?W???[?v?????s???A?u?t???[?X?|?b?g?v?{?^?????????B????MAC?A?h???X??ESS-ID?̃A?N?Z?X?|?C???g???g?????h?ł???̂ŁA?A?N?Z?X?|?C???g?ɐڑ?????IP?A?h???X???X?V??????ŁA?u???E?U????A?N?Z?X?|?C???g?̐ݒ??ʂ??J???Đݒ???s?????ƂɂȂ?B???̃N???C?A???g?}?l?[?W???[?Œ[?????̐ݒ?̕ύX???s??????A?ƒ???ł̗??p????O????LAN?T?[?r?X???p?Ƃ????????ɂ??A?N?Z?X?|?C???g?̐؂芷???Ȃǂ̑??삪?ł???B

?@?N???C?A???g?}?l?[?W???[?B?[?????̐ݒ?ύX??ڑ?????A?N?Z?X?|?C???g?̐؂?ւ????s??

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