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參數(shù)資料
| 型號(hào)： | 101-1262 |
| 廠商： | Rabbit Semiconductor |
| 文件頁數(shù)： | 79/120頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT DEV RCM5400W US/INTERNATIONL |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | RabbitCore 5000 |
| 類型： | Wi-Fi / 802.11.b |
| 頻率： | 2.4GHz |
| 適用于相關(guān)產(chǎn)品： | RCM5400W |
| 已供物品： | 板，模塊，線纜，CD，電源 |
| 其它名稱： | 316-1138 |
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User’s Manual
55
6. USING THE WI-FI FEATURES
6.1 Introduction to Wi-Fi
Wi-Fi, a popular name for 802.11b/g, refers to the underlying technology for wireless local
area networks (WLAN) based on the IEEE 802.11 suite of specifications conforming to
standards defined by IEEE. IEEE 802.11b describes the media access and link layer control
for a 2.4 GHz implementation, which can communicate at a top bit-rate of 11 Mbits/s. Other
standards describe a faster implementation (54 Mbits/s) in the 2.4 GHz band (802.11g).
The adoption of 802.11 has been fast because it's easy to use and the performance is com-
parable to wire-based LANs. Things look pretty much like a wireless LAN.
Wi-Fi (802.11b/g) is the most common and cost-effective implementation currently avail-
able. This is the implementation that is used with the RCM5400W RabbitCore module. A
variety of Wi-Fi hardware exists, from wireless access points (WAPs), various Wi-Fi
access devices with PCI, PCMCIA, CompactFlash, USB and SD/MMC interfaces, and
Wi-Fi devices such as Web-based cameras and print servers.
802.11b/g can operate in one of two modes—in a managed-access mode (BSS), called an
infrastructure mode, or an unmanaged mode (IBSS), called the ad-hoc mode. The 802.11
standard describes the details of how devices access each other in either of these modes.
6.1.1 Infrastructure Mode
The infrastructure mode requires an access point to manage devices that want to communi-
cate with each other. An access point is identified with a channel and service set identifier
(SSID) that it uses to communicate. Typically, an access point also acts as a gateway to a
wired network, either an Ethernet or WAN (DSL/cable modem). Most access points can
also act as a DHCP server, and provide IP, DNS, and gateway functions.
When a device wants to join an access point, it will typically scan each channel and look
for a desired SSID for the access point. An empty-string SSID (" ") will associate the
device with the first SSID that matches its capabilities.
Once the access point is discovered, the device will logically join the access point and
announce itself. Once joined, the device can transmit and receive data packets much like
an Ethernet-based MAC. Being in a joined state is akin to having link status in a
10/100Base-T network.
802.11b/g interface cards implement all of the 802.11b/g low-level configurations in firm-
ware. In fact, the 802.11b/g default configuration is often sufficient for a device to join an
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| 10112620-106LF | 功能描述:集管和線殼 RoHS:否 產(chǎn)品種類:1.0MM Rectangular Connectors 產(chǎn)品類型:Headers - Pin Strip 系列:DF50 觸點(diǎn)類型:Pin (Male) 節(jié)距:1 mm 位置/觸點(diǎn)數(shù)量:16 排數(shù):1 安裝風(fēng)格:SMD/SMT 安裝角:Right 端接類型:Solder 外殼材料:Liquid Crystal Polymer (LCP) 觸點(diǎn)材料:Brass 觸點(diǎn)電鍍:Gold 制造商:Hirose Connector |
| 10112620-142LF | 制造商:FCI 功能描述:578-5NPF-BERGSTIK STR 制造商:FCI 功能描述:HEADER BERGSTIK STR 制造商:FCI 功能描述:OEM ITEM 578-5NPF-BERGSTIK STR |
| 1011-262-0305 | 制造商:TE Connectivity / Deutsch 功能描述:BACKSHELL DT RECEPTACLE R/A 3WAY |
| 10112626-101LF | 功能描述:I/O 連接器 MINI-SAS HD 1X1 EXT BOARD CONN RoHS:否 制造商:Hirose Connector 產(chǎn)品:Plugs 系列:DH 端口數(shù)量: 位置/觸點(diǎn)數(shù)量:51 節(jié)距:1 mm 觸點(diǎn)電鍍: 觸點(diǎn)材料: 型式:Male 電流額定值:0.5 A 安裝風(fēng)格:Cable 端接類型:IDC 顏色: 安裝角: |
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