... (WiMax) 23 Hình 2. 1 Các chuẩn giao thức IEEE 8 02. 11 mô hình OSI .25 Hình 2.2 Mô hình kiến trúc theo chuẩn 8 02. 11 .26 Hình 2. 3: Các lựa chọn chuẩn 8 02. 11b 28 Hình 2. 4 Định ... (WiMax) 23 Hình 2. 1 Các chuẩn giao thức IEEE 8 02. 11 mô hình OSI .25 Hình 2.2 Mô hình kiến trúc theo chuẩn 8 02. 11 .26 Hình 2. 3: Các lựa chọn chuẩn 8 02. 11b 28 Hình 2. 4 Định ... 8 02. 16 (WiMax) 23 Hình 2. 1 Các chuẩn giao thức IEEE 8 02. 11 mô hình OSI .25 Hình 2.2 Mô hình kiến trúc theo chuẩn 8 02. 11 .26 Hình 2. 3: Các lựa chọn chuẩn 8 02. 11b 28 ...
... adapt and copy a portion of the specification as the base material for 8 02. 15.1 • 8 02. 15.1 standard – Approved in March 2, 20 02 – Fully compatible with Bluetooth version 1.1 Bluetooth Protocol Stack ... speed RF WPANs • Offer functionality beyond that of IR devices • Include – Bluetooth – 8 02. 15.4 (ZigBee) IEEE 8 02. 15.1 and Bluetooth • Industry specification – Bluetooth Special Interest Group (SIG) ... at a speed of up to Mbps Bluetooth version 2. 0 transmits at or Mbps 10 Bluetooth Protocol Stack (continued) 11 Bluetooth Protocol Stack (continued) 12 Bluetooth Protocol Stack (continued) 13 Bluetooth...
... two standards – IEEE 8 02. 15.3 and 8 02. 15.5 • IEEE 8 02. 15.3 standard – Defines the specifications for HR WPANs supporting speeds of 11, 22 , 33, and up to 55 Mbps • In the 2. 4 GHz ISM band Wireless# ... with 8 02. 11a networks • ZigBee and WiMedia products should be able to coexist with 8 02. 11b/g without any serious problems Wireless# Guide to Wireless Communications 42 Summary • IEEE 8 02. 15.3 -20 03 ... piconet Wireless# Guide to Wireless Communications 12 8 02. 15.3 Network Topology (continued) Wireless# Guide to Wireless Communications 13 8 02. 15.3 Network Topology (continued) • Types of dependent...
... điện tử với mạng LAN Cho đời chuẩn có tên gọi dự án 8 02 : 8 02. 3; 8 02. 4; 8 02. 5; 8 02. 11 Trong 8 02. 11 chuẩn cho mạng cục không dây, có nhiệm vụ định nghĩa các đặc tả tầng vật lý PHY, tầng MAC phần ... Hình 3.13 Phân mảnh khung Nhà quản lý mạng định nghĩa kích thước phân mảnh (như Hình 3.14 – Ciscopress.com : 8 02. 11 Wireless LAN Fundamentals ) 27 Hình 3.14 Thiết lập phân mảnh khung Sự phân mảnh ... chiếu OSI chuẩn 8 02. 11 Hình 2. 6 IEEE 8 02. 11 mô hình OSI Các chuẩn IEEE 8 02. 11: • 8 02. 11a : Là chuẩn cho WLAN, dải băng GHz, tốc độ liệu tối đa 54Mbps, phê chuẩn năm 1999 • 8 02. 11b : Là chuẩn cho...
... unused wires in a standard UTP Ethernet cable 11 WLAN Modes • Ad hoc mode • Infrastructure mode 12 Ad Hoc Mode • Also known as peer-to-peer mode – Formal name: Independent Basic Service Set (IBSS) ... as wired NIC • Access points parts – Antenna – Radio transceiver – RJ-45 wired network interface 18 ...
... – LMDS used the following ranges of frequencies • 27 .5 MHz and 28 .35 MHz • 29 .1 MHz and 29 .25 MHz • 30 GHz, 31.075 GHz, and 31 .22 5 GHz • Architecture – Cells (like a cellular telephone system) ... 12 Local Multipoint Distribution Service (LMDS) (continued) • Frequency – Based on high frequency, low-powered signals over short distances – LMDS used the following ranges of frequencies • 27 .5 ... sharing Security Availability of the technology 17 IEEE 8 02. 16 (WiMAX) • Standard for wireless broadband metropolitan area networks • 8 02. 16 supports enhancements and extensions to the MAC protocols...
... FDMA and TDMA technologies 14 2. 5 Generation Cellular Telephony • 2. 5 Generation (2. 5G) – – – – Interim step between 2G and 3G Operates at a maximum speed of 384 Kbps 2. 5G networks are packet-switched ... CDMA2000 1xEVDO • For 2. 5G CDMA2000 1xRTT networks 17 Third Generation Cellular Telephony (continued) • 3G network technologies (continued) – CDMA2000 1xEVDV will be the successor of CDMA2000 ... latitudes – Orbits typically have a 24 -hour period 38 Geosynchronous Earth Orbit (GEO) • Geosynchronous earth orbit (GEO) satellites – Stationed at an altitude of 22 ,28 2 miles – Orbit matches the rotation...
... Dò tìm các hoa t động gửi mail tự động, gửi hàng loạt theo kiểu virus để ngăn sự phá hoa i Ngoài ta khai báo thêm số thông số bấm vào nút Advanced • Số email gửi lần • Số người nhận ... Bảo vệ tính riêng tư Bảo vệ tường lửa – Fire Wall Firewall bảo vệ máy tính tránh khỏi những trao đổi thông tin có nguy gây hại cho máy tính bạn Z/A chia máy tính giao tiếp với máy tính ... nên bật chế độ Automatic Lock máy tính ta kết nối trực tuyến với Internet (VD: sử dụng ADSL), ta rời máy thời gian Z/A tự động bật chế độ kiểm soát truy cập vào Internet Email Protection: Mục...
... Proceedings of the IEEE, October, 20 00, pp 16 62 1676 [16] Lansford J HomeRF: A Wireless Voice and Data System for the Home, in Proceedings of IEEE ICASSP, 20 00, pp 3 718 3 721 Further reading [1] Wireless ... piconet However, the use of a 2/ 3 FEC code in HV2 packets reduces the voice information carried in the SCO packets to 20 bits Twenty voice bits are produced every 2. 5 ms resulting in the need ... differences between HomeRF versions 1 .2 and 2. 0 was released in 20 01 This version offers significantly higher data rates (up to 10 Mbps) than the previous version 1 .2 [15,16] and is backwards compatible...
... 1996 27 2 Wireless Networks [ 12] Kahol A., Khurana S and Jayasumana A P Effect of Hidden Terminals on the Performance of IEEE 8 02. 11 MAC Protocol, in Proceedings of IEEE LCN 98, 1998, pp 12 20 [13] ... 5.15 to 5 .25 GHz with devices that use this band producing 50 mW output signals The ‘middle’ band is in the 5 .25 –5.35 GHz band with a maximum of 25 0 mW The ‘high’ band utilizes 5. 725 –5. 825 GHz, ... propagation 9.6 .2 8 02. 11b Another recent development is the IEEE 8 02. 11b specification Like 8 02. 11a, it is also a specification for the physical layer It operates in the unlicensed 2. 4 GHz band The...
... Networking 20 11, 20 11:58 http://jwcn.eurasipjournals.com/content /20 11/1/58 Page 10 of 12 5.4 ) 5.3s b p M 5 .2( T 5.0 h r o u g 5.1 h p u t tneilC redivorP rehtO noitageled o/w 0001 008 006 004 0 02 Δ ... Proceedings of ISCC 20 04, 760–765 (July 20 04) 10 J Valdez, M Guirguis, Liberating TCP: the free and the stunts, in International Conference on Networking, 20 08, ICN 20 08, 72 77 (Apr 20 08) 11 P Liu, ... sKCA rof tiaW eurT dnar > β 2/ vcW ot cW esaerceD 2/ vpW ot pW esaerceD 2/ vcW = vcW teS 2/ vpW = vpW teS tekcap dneseR stekcap dneS v W esaercnI c tekcap dneseR v 2/ pW ot pW esaerceD eurT dnar...
... no 22 5938 and the project SENSEI with Grant no 21 5 923 References [1] N Davies, D P Siewiorek, and R Sukthankar, “Activity-based computing,” IEEE Pervasive Computing, vol 7, no 2, pp 20 – 21 , 20 08 ... ports 1 92 µs — Computes the energy in a frequency band from FFT data 20 0 µs 12 Computes a 32 bit real-valued FFT over a data window of n = 2k samples (exec time for FFT 186 ms 16 + 4n + ns 128 16-bit ... data 22 2 µs Synchronizer Synchronizes data by dropping packets until a user-defined event occurs 22 0 µs 10 Threshold Quantizes the data by applying a user-defined number n of thresholds 95 µs + 2n...
... calculated using (20 ) to (25 ) The average power consumption for transmitting the data packet and receiving the Ack packet can be calculated using (21 ) and (22 ) (20 ) (21 ) (22 ) Power consumed due ... SENSORCOMM ’08, Cap Esterel, France, 20 08, pp 20 9 21 6 [2] IEEE 8 02. 15.6, Application summary, 15-08-0406-00-0006-tg6-applicationsmatrix.xls, 20 08 [3] IEEE 8 02. 15.6, Technical requirement documents ... Biomed 13(6), 915– 925 (20 09) [13] M Miller, N Vaidya, A MAC protocol to reduce sensor network energy consumption using a wakeup radio IEEE Trans Mobile Comput 4(3), 22 8 24 2 (20 05) [14] I Demirkol,...