Wlan 802.11b Or Protocol 8.2.1 ?

[strontium_bismuth 0]

allo korang .. aku nak tanya sket ni . WLAN 802.11b tu support protocol 8.2.1 ke ? aper beza 802.11b ngan 802.11a ?? ok thanks !!

[mohdfadly 24]

802.11b - menghantar data dengan kelajuan 11 Mbps

802.11a - menghantar data dengan kelajuan 54 Mbps

which mean 802.11a is faster than 802.11b.

more info - http://www.wi-fiplanet.com/columns/article.php/961181

[takatadome 0]

Controversy has already plagued 802.11g. To finally get 802.11g out the door, by agreeing to disagree after years of 802.11 committee fights finally proved that neither one could get enough committee votes to gets its own pet 22Mbps solution official 802.11g blessing. The end result is that 802.11g is a compromise incorporating no fewer than four different wireless standards

For 802.11b compatibility, 802.11g incorporates 802.11b's Complementary Code Keying (CCK) to achieve bit transfer rates of 5.5 and 11Mbps in the 2.4Ghz band. In addition, 802.11g adopts 802.11a's Orthogonal Frequency Division Multiplexing (OFDM) for 54Mbps speeds but in the 2.4Ghz range.

802.11g also comes with a pair of optional, and incompatible, modes to achieve throughput ranges in the 22Mbps range. These are Intersil's CCK-OFDM mode with a maximum throughput of 33Mbps and TI's Packet Binary Convolutional Coding (PBCC-22), with a throughput range of 6 to 54Mbps.

Both 802.11a and 802.11g offers up to 55Mbps speeds in the lab. In the field, 802.11a delivers about 20Mbps. That may not sound like much unless you know that 802.11b's 11Mpbs theoretical speed is more often 4Mbps in practice. Early versions of 11g chipsets have real-world speeds in the 6Mbps range according to vendors.

It's also clear from early tests that 802.11g has the same, or perhaps slightly better, range than 802.11b. On the other hand, 802.11a seems to maintain a higher throughput out to the limit of its range, while 802.11g appears to run out of steam at its extreme range.

Of course, 2.4GHz, with interference from everything to satellites to microwave ovens to high-end wireless phones, has to contend with a lot of radio frequency (RF) noise. This can result in lower throughput, which in turn can effectively reduce its range. 802.11a's 5Ghz, on the other hand, has much less interference to deal with and it's part of the spectrum appears from FCC regulations likely to stay free of most other RF devices.

Finally, 802.11g can handle only three channels at once. The first generation of Aethero's chips though could handle eleven channels at once and the next generation supports thirteen channels in the US market and nineteen in Europe. Thus, in a business environment, with multiple users, even if components were delivering 55Mbps speeds, 802.11a would effectively have more bandwidth in heavy usage situations.

It's clear that neither technology is a slam-dunk over the other. Technology issues though are only part of the story.

[takatadome 0]

802.11a, 802.11b & 802.11g

[dzulcarnine 2]

er... nak sampuk ckit.... Wlan jenis 802.11b nie kawasan sebaran dia berapa jauh? coz pc aku pakai USB dooglr jenis 802.11b. pc nie beri akses tenet ke pc lain. yg buat aku musykil, bila aku bawak pocket pc (iPAQ) aku ke luar rumah, signal wlan aku lemah.... 1 bar jer... tapi bila bawak laptop pulah, signal baik, 3 bar. actually secara purata berapa jauh kawasan sebaran dier?

[topeiRa 0]

Sian, tanyak soklan camya terngagak sidak.. hehe

Lam manual usb doogler ko sikda madah ka?

[iskandariah45 0]

as far as i concern..hermm around beberapa meter la..meter ty aku tak tau plak..aku rasekan la just my 2 cent opinion...laptop tu besar...jadi dier bleh tangkap signal lebih baik...dan IPAQ tu kecik...jadi dier bleh tangkap signal ngam ngam kot...

pendapat yang agak ridikulus!

[man2 0]

lebih kurang 100meter support..tapi akan berkurangan mengikut keadaan bentuk mukebumi, ade penghalang ke.. dan sebagainya!!

[Rads78 0]

My 2 cents. External card is always better than internal / built in; in signal dan 802.11G lebih powerfull in signal whether connecting to 802.11B or G access point. Kira kalau aku scan guna 802.11G card percentage lebih tinggi.

[kotatinggi 0]

betul...sekarang pun teknologi dah canggih dah..jadi pada pandangan saya,baik kita guna tech yg ter baru diperkenalkan..untuk improvekan network kita kan?

pada pandangan sayala..jgn maree...