wireless wide area networks ppt
Describe wireless wide area networks (WWANs) and how they are used
Ngày tải lên :
13/09/2012, 10:52
... 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...
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Tài liệu Ethernet Access for Next Generation Metro and Wide Area Networks pptx
Ngày tải lên :
21/12/2013, 06:15
... 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...
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Báo cáo hóa học: " TCP-based window-size delegation method for TXOP Exchange in wireless local area networks" ppt
Ngày tải lên :
21/06/2014, 01:20
... 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...
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Low Rate Wireless Personal Area Networks
Ngày tải lên :
13/09/2012, 10:52
... 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...
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High Rate Wireless Personal Area Networks
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...
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Wireless Local Area Networks
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...
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Wireless Metropolitan Area 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)...
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Wireless Local Area Networks
Ngày tải lên :
29/09/2013, 21:20
... 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...
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Tài liệu Wide Area Networks doc
Ngày tải lên :
11/12/2013, 14:15
... 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...
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Tài liệu Ethernet Signal Preservation In Factory-Terminated Patch Cords for Local Area Networks pptx
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...
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Tài liệu Ethernet Signal PreservationIn Factory-Terminated Patch Cords for Local Area Networks ppt
Ngày tải lên :
25/01/2014, 06:24
... 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...
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wireless personal area networks - performance, interconnection, & security with ieee 802.15.4
Ngày tải lên :
25/03/2014, 12:14
... 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...
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Báo cáo hóa học: " Impact of the environment and the topology on the performance of hierarchical body area networks" ppt
Ngày tải lên :
20/06/2014, 22:20
... 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...
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Báo cáo hóa học: " A survey of performance enhancement of transmission control protocol (TCP) in wireless ad hoc networks" pptx
Ngày tải lên :
21/06/2014, 00:20
... 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...
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