wireless wide area networks ppt

... 8-PSK CDMA2000 1xRTT ã Operates on two 1.25 MHz -wide frequency channels ã Supports 144 Kbps packet data transmission 2 Objectives ã Describe wireless wide area networks (WWANs) and how they are used ã Describe ... 1xEVDO ã For 2.5G CDMA2000 1xRTT networks 25 Binary Runtime Environment for Wireless (BREW) ã BREW is a thin software environment Very small program that resides on a wireless device ã Capable ... (continued) ã Short Message Services (SMS) One of the most widely used applications – Allows for the delivery of short, text-based messages between wireless devices ã Messages are limited to about 160...

Ngày tải lên: 13/09/2012, 10:52

... and Wide Area Networks OL-14760-01 Design Considerations ã Use of EIGRP stub areas eliminates queries to spoke routers. ã OSPF must periodically synchronize router databases within an area, ... with inline power ã Wireless access points ã QoS, firewall, and web caching with IP voice gateway functions 21 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 ... suffer. Spokes Hubs virtual circuit 221485 3 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 Introduction For additional information on V3PN deployments, the following...

Ngày tải lên: 21/12/2013, 06:15

... Exchange, Wireless local area networks 1 Introduction In offices, homes, and public spaces, IEEE 802.11 wire- less local area n etworks (WLANs) has been extensive ly used to provide wireless Internet ... Nishio et al.: TCP-based window-size delegation method for TXOP Exchange in wireless lo cal area networks. EURASIP Journal on Wireless Communications and Networking 2011 2011:58. Submit your manuscript ... 12 RESEARCH Open Access TCP-based window-size delegation method for TXOP Exchange in wireless local area networks Takayuki Nishio 1* , Ryoichi Shinkuma 1 , Tatsuro Takahashi 1 and Go Hasegawa 2 Abstract We...

Ngày tải lên: 21/06/2014, 01:20

Ngày tải lên: 21/06/2014, 23:20

... using SIR ã Then they shift to FIR speed Wireless Communications Low Rate Wireless Personal Area Networks 2 Objectives ã Describe a wireless personal area network (WPAN) ã List the different ... work ã Describe the security features of low-rate WPAN technology 3 What is a WPAN? ã Wireless personal area network (WPAN) Group of technologies that are designed for short- range communications – Eliminates ... standard – IrDA devices cannot send and receive at the same time IrDA is easy to use ã Bluetooth is a wireless technology that uses short- range radio frequency (RF) transmissions – Supported by over...

Ngày tải lên: 13/09/2012, 10:52

... Wireless# Guide to Wireless Communications 22 Additional MAC Layer Functionality (continued) Wireless# Guide to Wireless Communications 24 Additional MAC Layer Functionality (continued) Wireless# ... same order in every frame Wireless# Guide to Wireless Communications 15 802.15.3 Network Topology (continued) Wireless# Guide to Wireless Communications 27 Ultra Wide Band (UWB) ã Allows new ... and storage Wireless# Guide to Wireless Communications 32 How UWB Works (continued) Wireless# Guide to Wireless Communications 18 Additional MAC Layer Functionality (continued) Wireless Communications Chapter...

Ngày tải lên: 13/09/2012, 10:52

... of wireless clients and an AP ã Extended Service Set (ESS) Two or more BSS wireless networks installed in same area – Provides users with uninterrupted mobile access to the network ã All wireless ... only communicate among themselves Wireless Communications Wireless Local Area Networks 4 WLAN Components ã Minimal hardware needed for a WLAN Computer ISP Wireless network interface card Access ... a wireless NIC – Mounted directly on the motherboard 3 WLAN Applications ã Wireless networks are increasing in popularity ã Installing cabling is inconvenient and very expensive Wireless networks...

Ngày tải lên: 13/09/2012, 10:52

... easily incorporate WiMAX networks 3 What is a WMAN? ã Wireless metropolitan area networks (WMANs) Provide wireless connectivity across a substantial geographical area such as a large city ã WMANs ... Wireless Communications Wireless Metropolitan Area Networks 14 Multichannel Multipoint Distribution Service (MMDS) ã Multichannel multipoint distribution service (MMDS) Fixed broadband wireless ... to an entire area with only a few radio transmitters – MMDS cell size can have a radius of up to 35 miles (56 kilometers) 2 Objectives ã Explain why wireless metropolitan area networks (WMANs)...

Ngày tải lên: 13/09/2012, 10:52

... improve- ments. 9.7 Summary In this chapter we cover the area of Wireless Local Area Networks by focusing on a number of issues: † WLAN topologies. The two types of wireless LAN topologies used today are the ... Krishnamurthy P. Wideband Local Access: Wireless LAN and Wireless ATM, IEEE Commu- nications Magazine, November, 1997, 34–40. [15] Geier J. Wireless LANs, Implementing Interoperable Networks, Macmillan ... Stallings W. Local and Metropolitan Area Networks, Fifth Edition, Upper Saddle River, NJ. [13] Obaidat M. S. and Ahmed C. B. Schemes for Mobility Management of Wireless ATM Networks, International Journal...

Ngày tải lên: 29/09/2013, 21:20

... 31 â 2000, Cisco Systems, Inc. www.cisco.com Keep All Graphics Inside This Box econ_0481_09_010 .ppt QoS Review QoS Review IP Traffic VoIP HTTP FTP Packets are: Marked (colored) at ingress at network ... 49 â 2000, Cisco Systems, Inc. www.cisco.com Keep All Graphics Inside This Box econ_0481_09_010 .ppt PQ-WFQ (IP RTP Priority) PQ-WFQ (IP RTP Priority) WFQ Interface 3 33 3 2 2 4 3 2 1 1 VV 4 44 ... 30 â 2000, Cisco Systems, Inc. www.cisco.com Keep All Graphics Inside This Box econ_0481_09_010 .ppt Application Traffic Application Traffic App Tier 1 Tier 2 Tier 3 Tier 4 Market Data 256 kbps per...

Ngày tải lên: 11/12/2013, 14:15

... of the square wave. Ethernet Signal Preservation In Factory-Terminated Patch Cords for Local Area Networks. OONNEE KRONE: 800-775-KRONE www.kroneamericas.com www.truenet-system.com. No part of...

Ngày tải lên: 19/01/2014, 05:20

... of the square wave. Ethernet Signal Preservation In Factory-Terminated Patch Cords for Local Area Networks. OONNEE KRONE: 800-775-KRONE www.kroneamericas.com www.truenet-system.com. No part of...

Ngày tải lên: 25/01/2014, 06:24

... WIRELESS PERSONAL AREA NETWORKS 1.4.2 IEEE 802.11 MAC The IEEE 802.11 protocol (O’Hara and Petrick 1999) is, strictly speaking, intended for wireless local area networks (LANs), rather than wireless ... constraints which guide the design and deployment of wireless sensor networks differ, sometimes substantially, from those that hold in wireless ad hoc networks (Achir and Ouvry 2004; Sohrabi et al. ... important in ad hoc networks. Differences from ad hoc networks. The requirements outlined above lead to a number of important differences between sensor networks and ad hoc networks, most notably...

Ngày tải lên: 25/03/2014, 12:14

... body area networks Jean-Michel Dricot 1* , Stéphane Van Roy 1 , Gianluigi Ferrari 2 , Franỗois Horlin 1 and Philippe De Doncker 1 Abstract Personal area networks and, more specifically, body area ... Jha, Energy comparison and optimization of wireless body -area network technologies, in Proceedings of the ICST 2nd International Conference on Body Area Networks (BodyNets ‘07), Florence, Italy ... medium access control protocol in wireless LANs. Wireless Networks. 10(5), 519–529 (2004) 28. J Weinmiller, M Schlager, A Festag, A Wolisz, Performance study of access control in wireless lans–IEEE 802.11...

Ngày tải lên: 20/06/2014, 22:20

... in wireless ad hoc networks TCP was designed for wired networks without consider- ing the complexity of wireless networks. With the advent of wireless technology TCP was also employed in wireless ... on wireless ad hoc networks, those readers who are interested in single-hop wireless networks are referred to [17]. The readers inter- ested in the surveys of TCP enhancement in wireless networks ... traditional wired network environments, while in wireless ad hoc networks, it does not perform well. Compared to wired networks, wireless ad hoc networks have some specific characteristics such...

Ngày tải lên: 21/06/2014, 00:20

Ngày tải lên: 21/06/2014, 07:20

Ngày tải lên: 21/06/2014, 17:20

Ngày tải lên: 21/06/2014, 17:20

Ngày tải lên: 21/06/2014, 23:20

Ngày tải lên: 21/06/2014, 23:20