báo cáo wireless phần 2 doc

Send - and - Wait a. Hình 4.4. Khung MSDU 3.2.6 Các không gian khung Inter (Inter Frame Space) SIFS - Short Inter Frame Space micrô - giây. PIFS - Point Cooordination IFS DIFS - Distributed IFS EIFS - Extended IFS Exponential Backoff n i n sau n K K min (n,10). Ad - hoc). 2. . 3.4 Roaming 3.6 3.7 3.8 3.8 Synch SFD 3.8 thúc gói, 3.8 3.8 b. ToDS c. FromDS d. More Fragments e. Retry f g h. WEP i 3.8 3.8 3.8 4.8.3.5 CRC 3.9 3.9 3.9 3.9 ). 2. (Adva nced Encryption Standard and Offset Codebook) 2. 3. C V 4.1 4.1.1 C char first_name [20]; r, Telnet, Sendmail, ARP, finger WLAN 4.1.2 4.2 4.2 bps) IEEE 802.11 2.4 GHz DSSS 2 IEEE 802.11 2.4 GHz FHSS 2 IEEE 802.11 850 - 950 nm IR 2 IEEE 802.11a 5 GHz OFDM 54 IEEE 802.11b 2.4 GHz DSSS 11 4.2 4.2 Ad Hoc Ad Hoc Ad Hoc Hình 4 4.2 4.3 p 4.4 4.4 Hình 4 4.4 . 4.4 4.4 Hình 4 4.4 . 8 02. 11 2. 4 GHz DSSS 2 IEEE 8 02. 11 2. 4 GHz FHSS 2 IEEE 8 02. 11 850 - 950 nm IR 2 IEEE 8 02. 11a 5 GHz OFDM 54 IEEE 8 02. 11b 2. 4 GHz DSSS 11 4 .2 4 .2 Ad Hoc Ad Hoc Ad Hoc Hình 4 4 .2 . 2. (Adva nced Encryption Standard and Offset Codebook) 2. 3. C V 4.1 4.1.1 C char first_name [20 ]; r, Telnet, Sendmail, ARP, finger WLAN 4.1 .2 4 .2 4 .2 bps) IEEE 8 02. 11 2. 4. Send - and - Wait a. Hình 4.4. Khung MSDU 3 .2. 6 Các không gian khung Inter (Inter Frame Space) SIFS - Short Inter Frame Space micrô - giây. PIFS