[생초보의 무선네트워크 이야기 4] 무선 네트워크의 대명사, 무선 LAN

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[생초보의 무선네트워크 이야기 4] 무선 네트워크의 대명사, 무선 LAN
  출판일 :2007년 1월호

 무선 LAN은 기존 유선 LAN에서 케이블을 제거했다는 데 의미를 두고 있다. 선이 없다는 단순한 이유만으로 무선 LAN은 무궁한 가능성과 가치를 지니게 됐다. 1999년 2.4GHz대에서 최대 11Mbps의 전송속도를 실현하는 IEEE802.11b가 표준 승인된 이후, 무선 LAN은 사무실을 비롯해 가정과 공공 장소에까지 널리 확대됐다.


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연■재■순■서
1. 생초보의 무선 네트워크 이야기 (2006년 9월호)
2. 생활 환경 변화의 선봉, 무선 PAN (2006년 11월호)
3. 유비쿼터스 시대를 열어가는 RFID (2006년 12월호)
4. 무선 네트워크의 대명사, 무선 LAN (2007년 1월호)
5. 차세대 무선 LAN, 801.11n과 메시 네트워크 (2007년 2월호)
6. 유선과 무선 양쪽에서 경쟁하는 무선 MAN (2007년 3월호)
7. 4세대를 꿈꾸는 무선 WAN(2007년 4월호)

 

무선 LAN(Wireless Local Area Network)의 의미는 다들 알고 있을 것이다. 그래도 얘기해본다면, 무선 LAN이란 유선 LAN의 확장 또는 대체를 위해 전파(Radio Frequency) 또는 빛을 이용해 공중 상에서 데이터를 전송하고 수신하는 방식으로 장비간에 무선을 이용해 연결함으로써 고객에게 이동성을 보장하고 사무환경을 개선하는 기술이다. 무선 LAN은 눈에 보이지 않는 전파를 이용하기 때문에 구축 시간과 경비를 대폭 절감할 수 있을 뿐만 아니라 전파의 도달 범위 안에서 자유롭게 이동하면서 네트워크에 접속할 수 있어 고정적인 네트워크의 개념을 움직이는 네트워크의 개념으로 전환시킨다. 종류에는 무선 LAN, 블루투스, 무선 홈네트워크, 적외선 통신 등이 있다. 특히 IEEE 802.11 규격에 맞는 기기로 구성된 네트워크를 지칭하는 경우가 많다.

 

 

 

 

이동성 통해 배선의 용이성과 변경 용이
이렇게 장황한 무선 LAN 의미의 요점은 바로 케이블이 없다는 데 있다. 쉽게 설명하자면 무선 통신으로 데이터의 송수신을 하는 LAN을 말한다.

 

무선 LAN의 장점 또한 케이블이 없어짐으로써 생기는 이점이다. 케이블이 없기 때문에 설치 장소의 제한을 받지 않아 유선 LAN에 비해 활용 범위가 넓다. 이런 특징으로 초기의 무선 LAN은 케이블을 설치할 수 없는 전시회나 세미나, 가건물, 산업 현장 등에서 주로 사용돼 왔다.

 

하지만 무선 LAN의 가장 큰 장점은 뭐니뭐니 해도 배선의 어려움을 해결하고 사무실의 구조를 변경할 때 드는 수고를 대폭 줄일 수 있다는 점이다. 이는 네트워크 비용을 절감할 수 있는 결정적인 요인으로 성능 향상 못지 않은 매력을 가져다준다.

 

유선 LAN 연결에서는 UTP에서부터 동축케이블, 광섬유 등이 벽이나 마루, 천정 심지어 책상 사이사이를 지나 서버나 일반 데스크톱 PC까지 연결된다. 이렇게 케이블을 기존의 사무실에 설치하는 것도 복잡한 일이지만, 일단 배선이 끝나더라도 LAN 구성은 하드웨어에 얽매일 수밖에 없다.

 

기존 유선 LAN은 케이블링 설치와 유지 보수 문제의 문제가 있었다. 부서, 사용자가 자리를 이동할라치면, 네트워크의 토폴로지 변경이 그리 쉽지 않았다. 또한 PC나 노트북을 이동시키거나 네트워크를 확장하기 위해서는 케이블링 비용이 드는 것은 물론, 사무실 내부는 공사판이 된다.

 

 

 

무선 LAN, 메시 네트워크로 발전할 듯
무선 LAN은 사업장의 성격에 따라 때로는 필수적으로 설치되기도 하는데, 사내 레이아웃을 자주 변경해야 하는 기업의 경우, 변경할 때마다 해줘야 하는 케이블링이 불필요하다는 점이 큰 장점으로 작용하고 있다. 또한 네트워크의 발전에 따라 이동성이 중요한 업무 환경에도 무선 LAN은 필수적이다. 이렇게 구축된 무선 LAN은 향후 네트워크 확장시 추가로 허브나 케이블링 또한 불필요하다.

 

이외에도 구축 후 미관상의 문제도 해결해 줘, 임시 네트워크 구축의 필요가 있는 전시장이나 세미나, 건설 현장 등에 유용하게 쓰인다.

 

최근 대학 캠퍼스의 경우 무선 LAN으로 캠퍼스 전역을 연결해 기존 연구실이나 교수실 외에 캠퍼스 어디에서나 노트북 PC를 이용해 네트워크를 이용할 수 있다. 이는 무선 LAN을 메시 네트워크로 구축한 것인데, 최근 계명대학교에 구축되는 등 빠르게 확산되고 있다.

 

메시는 케이블 설치 없이 여러 액세스 포인트를 하나의 무선 네트워크 또는 핫 존에 연결해 방대한 무선 접속거리를 제공하는 기술이다. 메시 네트워크는 광대역 데이터 전송과 휴대폰 이동성을 결합한 차세대 무선 네트워크 기술로 액세스포인트 당 무선 접속 거리가 수 Km로 기존 무선 LAN(50~200m)에 비해 월등하다. 설치 기술이 쉽고 광범위한 지역을 서비스할 수 있는 장점으로 인해 그간 벤처기업이 선도하던 시장을 글로벌 네트워크 업체까지 진출했다. 메시 네트워크와 관련해서는 다음 호에 자세히 설명하기로 하고 무선 LAN의 종류와 표준화에 대해 먼저 짚어보자.

 

 

 

무선 LAN의 대표적인 표준, IEEE 802.11
무선 네트워크 중 가장 얘기하기 싫은 것이 표준화 얘기다. IEEE로 시작하는 숫자들이 괜시리 어려워 보이는 것은 나만의 생각인가. 그래도 배우려면 부딪치는 수밖에 없다. 우선 숫자는 생각할 필요없다. 802라는 것은 이 표준 단체가 1980년 2월에 결성된 것이라는 의미밖에 없다. 그나마 다행이다. 이제는 a부터 시작해 y까지 몇 알파벳을 제외하고 이어지는 WG(Working Group) 또는 TG(Task Group)는 머리를 하얗게 만들지도 모른다. 처음부터 다 아는 사람은 없기에 하나씩 알아가도록 하자. 어렵다면 그냥 넘어가도 상관없다.

 

IEEE 802 LAN/MAN 표준 위원회(Standards Committee)는 LAN과 MAN(Metropolitan Area Network)의 OSI(Open System Interconnection) 모델 하위 2계층(PHY 계층과 데이터링크 제어 계층)을 다루는 미국의 표준화 단체다. IEEE 802.11은 그 중에서 무선 LAN을 취급하고 있는 WG다. 이 WG가 설립된 지 7년 후인 1997년 7월에 IEEE 802.11 무선 LAN 규격이 승인됐다.

 

IEEE 802.11은 산업, 과학, 의료용인 2.4GHz 대역을 이용해 하나의 MAC 계층(Media Access Control layer)과 3가지 PHY(물리) 계층 기술로 구성돼 있다. PHY 기술은 주파수 호핑(Frequency Hopping Spread Spectrum), 대역 확산(Direct Sequence Spread Spectrum)과 적외선통신(IR) 기술 등이 있으며, 전송속도 1~2Mbps를 지원한다. 이중에서 DS-SS 방식은 802.11b로 반영됐고, 이후 2.4GHz뿐만 아니라 4.9/5GHz 주파수 대역으로 다양해지고, OFDM( Orthogonal Frequency-Division Multiplexing) 기술을 사용하면서 높은 전송 속도를 제공하게 됐다.

 

PHY 계층 기술 중 FHSS 기술은 주파수 도약 확산 스펙트럼 방식으로 무선 통신에서 주파수를 고정하지 않고 시간에 따라 변화시켜 송신하는 스펙트럼 확산 방식이다. 즉 송신 측과 수신 측에서 주파수 위치를 변화시켜 통신하는 것이다. 이 기술은 송신 데이터는 주파수를 편이 변조시켜 도약 패턴으로 주파수를 도약해 외관상 주파수 대역폭을 넓혀 송신하고, 반대로 수신 신호는 복조과정을 거쳐 데이터를 검출한다. 전 과정에서 어떤 간섭파가 존재하는 경우 간섭파에 반사된 송신파는 폐기돼 재전송되고, 반사되지 않으면 영향을 받지 않는다.

 

DS-SS 기술은 직접 시퀀스 확산 스펙트럼 방식으로, 하나의 신호 심볼을 일정한 시퀀스로 확산시켜 통신하는 것이다. 의사 잡음 시퀀스(pseudo-random noise sequence)에 원래의 신호를 입력시키면, 주파수당 전력 밀도가 낮아진 확산 대역 스펙트럼 신호를 얻을 수 있다. 수신 측에서도 동일한 시퀀스의 의사 잡음 시퀀스를 이용하면 원신호를 재생할 수 있으며, 다수 사용자가 사용할 수 있다. 변조의 효율성이 좋고, 신호의 동기가 빠르며, 낮아진 전력 밀도로 대역 내 간섭이 적은 장점이 있어 부호 분할 다중 저속(CDMA) 방식에 사용되고 있다. 지그비도 이 방식을 쓴다.

 

IEEE 802.11 표준은 IEEE 802.3 이더넷이나 IEEE 802.5 토큰링과 마찬가지로 OSI 7계층 참조 모델에서 PHY 계층과 데이터링크 제어 계층의 부계층(sub layer)인 MAC 부계층에 대한 기술적인 요구사항을 정의할 뿐 구체적인 구현 방법에 대해서는 명시하지 않았다.

 

 

 

다양한 부가 기능을 수행하는 MAC 계층
IEEE 802.11 표준의 가장 중요한 핵심은 MAC 계층에 있다고 볼 수 있다. IEEE 802.11 MAC 계층은 데이터 송수신과 관련한 기본적인 제어 기능을 수행한다. 그밖에 에러 체크와 패킷 재전송, 패킷 분할, 암호화와 인증, 장치 스캐닝, 액세스 포인트 간의 접속 이동, 전력 관리, RTS/CTS 등 802.3 이더넷에는 없는 여러 가지 추가적인 기능들을 수행한다. 802.11 MAC 계층이 802.3 MAC 계층보다 다양한 부가 기능을 수행하는 이유는 유선이 아닌 전송 환경이 열악한 무선에서 통신을 수행하기 때문이다.

 

· IEEE 802.11b는 DS-SS를 이용해 1~2Mbps 전송 속도를 제공하고, CCK(Complementary Code Keying)를 통해 5.5, 11Mbps의 전송속도를 지원하도록 설계됐다. 주파수는 2.4GHz를 이용하고, 초기 무선 LAN 활성화에 기여한 제품이 802.11b 표준을 이용한 기기이며, 국내에서는 KT 네스팟으로 대표되는 무선 LAN 서비스에 이 기술이 활용됐다.

 

·IEEE 802.11a는 OFDM(Orthogonal Frequency Division Multiplex)을 적용해 최대 54Mbps의 전송 속도를 지원할 수 있도록 PHY 계층을 정의했다. 5GHz 대역 주파수를 사용하는 802.11a 표준에서 주목할 부분은 유럽과 일본의 5GHz 주파수 대역에 레이더의 사용으로 인해 전파간섭을 회피하기 위한 방법으로 송신출력제어(Transmitter Power Control)과 동적 주파수 선택(Dynamic Frequency Selection) 방식을 표준에 포함했다는 점이다.

 

·IEEE 802.11g는 2003년 완료된 표준으로, 2.4GHz 주파수 대역에서 OFDM을 적용해 최대 54Mbps의 전송 속도를 지원한다. 802.11g는 2.4GHz 대역에서 802.11b와 호환성을 유지하기 위해 DS-SS 기술과 CCK. 그리고 802.11a의 OFDM 방식 중에서 6, 12, 24Mbps를 필수 사항으로 채택했다. 또한 802.11b로부터 802.11g의 프레임을 보호하기 위한 보호 메커니즘이 추가됐다.

 

·IEEE 802.11j는 지난 2002년 일본에 할당한 4.9~5GHz 대역을 이용해 무선 접속 서비스를 제공하기 위한 것으로, 2002년 하반기에 802.11a를 기반으로 OFDM을 적용해 최대 54Mbps의 전송 속도를 지원하는 표준을 개발했으며, 2004년 표준화가 완료됐다.

 

·IEEE 802.11n은 차세대 무선 LAN의 새로운 표준을 만들기 위해 WNG(Wireless Next Generation) SC(Standing Committee)에서 만들어진 SG(Study Group)로, 2002년 5월 HTSG(High Throughput Study Group)의 구성을 승인받고, 2002년 9월 회의를 첫 시작으로, 2003년 9월 회의부터 802.11n이라는 TG로 정식 활동하게 됐다. 802.11n은 PAR를 통해 액세스 포인트(Access point)에서 적어도 100Mbps의 전송속도를 지원하는 차세대 무선 LAN 요소 기술을 표준화 범위로 정의했다. 이를 위해 다중 안테나를 이용해 주파수 효율을 증가시키는 MIMO 방식(SDM, STC, STBC)과 공간분할다중접속(SDMA) 방식, 이 밖에도 적응형 변조 기술(Adaptive OFDM) 등이 고려됐다. 802.11n은 PHY뿐만 아니라 MAC 계층을 동시에 고려해 11a과 11g와의 호환성을 제공한다. 2006년 1월 11n의 첫 표준 초안, 802.11n/D0.01버전이 마련됐고, ETRI를 비롯한 국내기업의 활동이 두각을 나타내고 있다. 그러나, 2006년에는 승인에 실패해 내년 9월로 표준 승인이 미뤄진 상태다.

 

·IEEE 802.11e는 MAC Enhanced for QoS(Quality of Service)라는 이름의 TG로 다양한 QoS를 지원할 수 있도록 IEEE 802.11 MAC 계층을 개선하는 것을 목적으로 만들어졌다. MAC 계층에서 정의된 접속방식인 DCF Inter-Frame Spacing(DIFS)의 단점인 대기 시간이 긴 문제 등을 개선하는 Enhanced DCF Distributed Coordination Function(EDCF)를 2005년 표준화했다. QoS 향상 목적으로 IEEE 802.11e가 새로 제안한 채널 접속 방식은 HCF(Hybrid Coordination Function)이다.  HCF는 EDCF(Enhanced DCF)라는 경쟁 기반의 채널 접속 방식과 폴링 방식(Polled Channel Access)을 함께 사용한다. EDCF는 기존의 DCF를 보완한 것으로 802.1P CoS(Class of Service)에 따라 트래픽을 8개의 카테고리로 나눌 수 있고, 이에 따라 IFS(Inter Frame Space)와 CWmin(Content Windows min size)를 다르게 함으로써 트래픽 카테고리별로 서비스를 차별화하기 위한 방법이다.

 

·IEEE 802.11f는 IAPP(Inter Access Point Protocol)로, 서로 다른 액세스 포인트 제품들 간의 상호 호환성을 유지하면서 핸드오프(Hand off)를 지원하기 위한 최소한의 액세스 포인트간 통신규약과 프로토콜을 정의하는 것을 목표로 2003년 표준화가 완료됐다.

 

·IEEE 802.11h는 11a의 시스템 성능 향상과 5GHz 대역을 사용하는 무선 LAN 규격이 레이더와 같은 간섭을 회피할 수 있도록 앞서 설명한 DFS(Dynamic Frequency Selection)와 TCP(Transmitter Power Control)를 기본으로 포함하는 표준화로 2003년 완료됐다. 이는 802.11a의 유럽 대응을 위해 발족한 그룹이다. 유럽의 무선 LAN 규격인 HIPERLAN/2(HIgh PErformance RadioLAN type 2) 등과의 공존을 꾀하기 위해서다. 유럽의 표준화 단체이며, HIPERLAN/2의 사양을 내고 있는 ETSI/BRAN(European Telecommunication Standards Institute/Broadband Radio Access Networks)와 깊이 관여해 활동하고 있다.

 

·IEEE 802.11i는 보안 관련된 TG로, 시큐리티와 인증 메카니즘을 개발해 2004년 표준화를 완료했다.

 

·IEEE 802.11k는 기존 표준이 무선 LAN의 라디오 자원 측정에 있어서, 내적인 부분만을 다루고 있는 것에 대해 외적인 부분, 예를 들면, 로밍, 공유 등까지 포함해 무선 자원을 측정하고 관리하기 위한 작업을 수행한다. 이것은 외적인 자원으로부터 서비스를 관리하기 위해 필요한 측정결과와 정보를 제공하기 위해 필요하다. 2006년 3월 승인에 성공했다.

 

·IEEE 802.11REVma는 유지 변경(maintenance change)라 하며, 802.11-1999와 2003 버전의 PAR를 개정하는 작업을 수행한다. 일정 기간동안 축적된 편집과 기술적인 부분을 교정하는 TG로, 2006년 현재 5.0 버전이 표준화된 상태다. 2006년 4월 승인에 성공했다.

 

·IEEE 802.11p의 PAR는 2006년 5월 25일 승인됐으며, 최소 200km/h의 속도에서 반경 1000m를 커버하며, 자동차 등 운송수단과 길거리의 장치 또는 운송수단 간에 5GHz의 주파수 대역을 사용해 통신을 지원하는 ITS(Intelligent Transportation System) 애플리케이션의 PHY 계층과 MAC 표준을 마련하는 TG로, ISO TC204/ WG16과 관련이 있다. 2006년 4월 승인에 실패했다.

 

·IEEE 802.11r의 목적은 빠른 로밍(roaming)을 제공하기 위한 것으로 BSS(Basic Service Set) 변환 동안 발생하는 Station(STA)과 Distribution System(DS) 간의 시간정보에 대한 자료의 양을 최소화하거나 제거함으로서, IEEE 802.11 MAC 계층을 제한하고 향상시키는 것이다. 802.11r은 기준시간이나 시간조건 등을 연구하고, IEEE 802.11 ESS 내에서 BSS 전환을 향상시키고, VoIP와 같은 응용을 제공하기 위해 실시간을 지원하기 위한 목적을 가지고 있다. 2006년 4월 승인에 성공했다.

 

·IEEE 802.11s 프로젝트의 연구 범위는 자기 구성(self-configuring), 멀티 홉(multi-hop) 기술을 사용하는 액세스 포인트 간에 방송/멀티케스트(multicast)와 유니케스트(unicast)를 지원하기 위해, IEEE 802.11 PHY/MAC 계층을 이용해 IEEE 802.11 Wireless Distribution System(WDS)에서 IEEE 802.11 ESS 메시 네트워킹(Mesh Networking)을 개발하기 위한 것이다. IEEE 802.11-1999(2003 edition) 표준은 WDS를 생성하기 위해 액세스 포인트 간에 교환하는 데이터 패킷에 대해 4개 주소 프레임 포맷을 제공했다.

 

·IEEE 802.11t는 WPP SG(Wireless Performance Prediction Study Group)라는 SG로 시작해, 2004년 PAR 승인을 얻었고, 현재 TGt로 활동하고 있다. 802.11t가 활동하게 된 배경은 IEEE 802 프로젝트에 IEEE 802.11 장비와 시스템과 관련해 제조업체나 판매자를 평가할 수 있는 그 어떤 측정 방법도 없었기 때문이었다. 따라서 판매나 그 밖의 관련자들은 현재, 실험조건이나 표준 측정 방법없이 전도성 성능 시험(conduct performance tests)만을 수행하고 있다. IEEE 802.19에서 서로 다른 802 장비나 프로토콜 간의 공유 이슈를 다루고 있긴 하지만, 802.11 장비의 성능을 위한 측정방법 등은 명확히 다루고 있지 못한 실정이다. 무선 네트워크의 성능을 분석하고 예측하기 위해서는 측정방법에 대한 요구가 필수적이었다. 이와 유사한 역할을 하는 IEEE 802.11k는 무선 LAN 프로토콜과 관련된 변화와 측정 등을 정의하고 있다. 이와 같이 TGt에서는 IEEE 802.11 장비에 대해 측정 구성도와 측정방법 등을 제공하면서, 신뢰성을 향상시킬 수 있다. 802.11t를 통해 개발되는 방법론의 활용 대상자는 IT 관리자와 측정연구실, 시스템 설치자와 802.11 장비 사용자뿐만 아니라, 802.11과 연동하는 소프트웨어, 칩셋 개발자 등이 포함된다.

 

·IEEE 802.11u는 외부 네트워크, 예를 들면 IETF, 3GPP 그리고 3GPP2 등과 상호작용을 제공하기 위한 표준으로, 2004년 12월 PAR 승인을 얻었다. PAR의 주요 내용은 IEEE 802.11 PHY/MAC과 다른 네트워크와의 상호작용이 가능하도록 무선 인터페이스(air interface)와 관련 규정을 개정하는 것이 목적이다. 이와 관련해 IEEE 802.21(Media Independant Handover)는 IEEE 802 무선 기술과 셀룰러 네트워크 간의 핸드오프를 비롯한 다양한 무선시스템 간의 핸드오프를 연구하고 있다.

 

·IEEE 802.11v는 Wireless Network Management라 해 현재 IEEE 802.11에서 사용하는 Simple Network Management Protocol(SNMP)에 대한 문제점 파악과 이의 해결을 위한 연구가 진행되고 있고, 2007년 3월 WG 투표를 준비하고 있다.

 

·IEEE 802.11w는 2005년 3월 20일 PAR의 승인을 받고, 데이터 축적, 데이터 신뢰성, 재생보호 그리고 데이터의 기밀성 등을 보장하기 위한 메카니즘을 제공하기 위해 IEEE 802.11 MAC을 향상시키기 위한 연구를 추진하고 있다.

 

·IEEE 802.11y는 3,650~3,700MHz 주파수 대역에서 브로드밴드 무선 서비스(Broadband Wireless Services)를 제공하기 위해 연구하는 TG이다.

 

 

 

호환 테스트 인증 로고 Wi-Fi, 무선 LAN을 통칭
IEEE 802.11 표준은 표준화된 기술과 제품간 상호 호환성을 제공한다는 측면에서 무선 LAN 시장에 많은 장비업체의 참여를 앞당겨 시장 성장의 동인 중 하나다. IEEE 표준으로 무선 LAN을 분류해보면, IEEE 802.11b, IEEE 802.11g, IEEE 802.11a와 함께 올해 9월 표준 규격이 제정될 예정인 IEEE 802.11n 등이 있다.

 

IEEE 802.11b는 2.4GHz 대역에서 11Mbps 전송 속도를 제공하는 가장 널리 알려진 무선 LAN 표준이다. 1999년 802.11b와 함께 표준이 제정된 802.11a는 5GHz 대역에서 54Mbps의 전송속도를 제공한다. IEEE 802.11g는 IEEE 802.11b와 같은 2.4GHz 대역에서 22M, 54Mbps의 전송 속도를 제공한다.

 

앞서 말한 바와 같이 IEEE 802.11b 표준은 무선 LAN 기술과 시장을 급격하게 성장시키는 동력이 됐다. 유선 LAN과 비슷한 11Mbps급의 속도를 제공하고, 높아진 안정성, Wi-Fi 협회(Wi-Fi Alliance)의 Wi-Fi 인증을 통한 호환성 보장, 그리고 낮아진 가격을 제공함으로써 무선 LAN 사용 장벽을 허물었다.

 

무선 LAN을 얘기하면서, 무선 LAN의 대표적인 명사가 된 Wi-Fi를 설명하지 않을 수 없다. 초기 무선 LAN 제품을 사용하는 데 있어 가장 큰 문제점으로 부각한 것이 호환성에 대한 문제였다. 각 제조 업체들이 모두 IEEE 802.11에 따른 표준 규격을 기반으로 제품을 공급했으나, 호환이 안돼 각기 다른 제조업체의 제품을 사용할 수는 없었다. 이에 따라 업계에서 무선 LAN 제품의 시장을 확대시키자는 목적으로 별도의 단체를 설립해 호환성을 검증하기로 했다.

 

Wi-Fi 협회는 무선 LAN 제품간 상호운용성에 대한 인증을 제공하기 위해 1999년 창립된 비영리 조직으로 2003년 상반기까지 WECA(Wireless Ethernet Capability Alliance)라는 명칭이었다. 이 협회는 무선 LAN 제품에 대해 상호운용성에 대한 테스트를 진행하고 테스트에 통과한 제품에 대해서 Wi-Fi 인증을 부여한다.

 

Wi-Fi 협회에서 테스트를 하는 제품은 초기 IEEE 802.11b에 한정돼 있었으나, IEEE 802.11g, IEEE 802.11a 등 전송 속도를 개선한 기술들이 등장함에 따라 이들 기술을 기반으로 하는 전 제품으로 확산됐다.

 

Wi-Fi(Wireless Fidelty) 인증을 획득한 제품에 대해서는 상호간의 호환성이 입증됨으로써 서로 다른 제조 업체들의 제품이라도 혼용해서 사용할 수 있음을 입증한다. 이에 따라 무선 LAN 제품의 확산에 일조하게 됐는데, Wi-Fi가 확산되고 난 이후에는 거의 모든 무선 LAN 제품들이 Wi-Fi 인증을 획득해 출시한다. 국내의 무선 LAN 서비스 업체인 KT, SKT, 하나로통신 등도 무선 LAN 제품의 구매 제품들의 기술 규격에도 Wi-Fi 인증을 의무화하고 있다. 그래서 최근 무선 LAN 제품은 표준 규격 종류와는 상관없이 Wi-Fi라는 이름으로 총칭해서 부른다.

 

 

 

2.4GHz 대역 다른 근거리 무선 기술과 의 간섭 장애
무선 LAN은 각 나라마다 ISM(Industrial Scientific Medical) 밴드로 지정한 대역 내에서 사용할 수 있으며, 세계적으로 대부분의 국가가 2.4GHz 대역을 ISM 밴드로 지정함에 따라 무선 LAN 업체들은 2.4GHz 대역에서 사용할 수 있는 제품을 출시하고 있다. 한편 5GHz 대역의 ISM 밴드는 나라마다 5.125∼5.325GHz과 5.75∼5.825GHz을 지정하고 있어 무선 LAN 업체들은 나라의 특성에 맞는 제품을 별도로 출시하고 있다. 국내에서는 현재 2.4GHz과 5.75GHz 대역이 ISM 밴드로 지정돼 있다.

 

가장 널리 사용되고 있는 2.4GHz 대역의 무선 LAN 기술에는 IEEE 802.11b와 IEEE 802.11g, 그리고 홈RF가 있다. 물론 블루투스도 2.4GHz 대역을 사용한다. 2.4GHz는 이전에도 혼잡한 상태에 있었는데, 여기에 홈RF와 블루투스가 가세함으로써 혼잡도 증가로 인해 간섭에 의한 장애 문제가 대두되고 있다.

by amplengine | 2008/04/04 02:20 | Network Theory | 트랙백(9560) | 핑백(1) | 덧글(1)

트랙백 주소 : http://amplengin2.egloos.com/tb/210865
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Commented by 케간지무늬 at 2008/04/05 17:57
잘 읽고 갑니다. IEEE 802.11p에 대한 정보가 몇줄 없엇 아쉽긴 하지만... 여전히 어려운 협회네요.

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