wide area networks advantages disadvantages

... 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 ... (2.5G) Interim step between 2G and 3G – Operates at a maximum speed of 384 Kbps – 2.5G networks are packet-switched Advantages of packet switching ã Much more efficient Can handle more transmissions ... pager, satellite telephone, and location services 41 Summary ã In cellular telephone networks, the coverage area is divided into sections called cells ã Cellular technology generations First...

Ngày tải lên: 13/09/2012, 10:52

Ngày tải lên: 11/12/2013, 14:15

... 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, ... circuit Branch Hubs/Campus Voice Gateway PSTN 221479 11 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 Technology Overview The remote routers have a sub-interface corresponding ... 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

Ngày tải lên: 19/10/2014, 09:06

... 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 WPAN standards and their ... locate people at home or at the office Security systems Interactive toys Inventory tracking ã Advantages WPAN devices use very little power – Short range helps maintain security and privacy ... 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...

Ngày tải lên: 13/09/2012, 10:52

... are a nanosecond long Signal spreads over a very wide frequency band ã In the UWB case, the signal spreads over a band that is at least 500 MHz wide Orthogonal frequency division multiplexing ... Layer Functionality (continued) Wireless Communications Chapter 6 High Rate Wireless Personal Area Networks Wireless# Guide to Wireless Communications 36 Competition Among WPAN Standards ã IEEE ... to Wireless Communications 28 How UWB Works ã UWB PHY Digital signals need to be spread over a wide band ã Using techniques such as FHSS or DSSS UWB uses short analog pulses for signaling ã Does...

Ngày tải lên: 13/09/2012, 10:52

... 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 ... wireless clients can only communicate among themselves Wireless Communications Wireless Local Area Networks 4 WLAN Components ã Minimal hardware needed for a WLAN Computer ISP Wireless network ... motherboard 3 WLAN Applications ã Wireless networks are increasing in popularity ã Installing cabling is inconvenient and very expensive Wireless networks solve this problem ã With a wireless...

Ngày tải lên: 13/09/2012, 10:52

... installing wired connections to remote areas 9 Free Space Optics (continued) ã Advantages of FSO Cost Speed of installation Transmission rate Security ã Disadvantages of FSO Atmospheric conditions ... 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 ... 17 Multichannel Multipoint Distribution Service (MMDS) (continued) ã Advantages of MMDS Signal strength Cell size Cost ã Disadvantages of MMDS – Physical limitations – Frequency sharing – Security – Availability...

Ngày tải lên: 13/09/2012, 10:52

... tố hết sức quan trọng. Giải pháp mạng WAN ( Wide Area Network - Mạng diện rộng ) được áp dụng. Chúng có nhiệm vụ kết hợp tất cả các mạng LAN (Local Area Network ) ở xa lại thành một mạng duy...

Ngày tải lên: 27/04/2013, 22:04

... C. and Heile R. F. Paving the Way for Personal Area Network Standards: an Overview of the IEEE P802.15 Working Group for Wireless Personal Area Networks, IEEE Personal Commu- nications, February, ... and Personal Digital Assistants (PDAs). Wireless Networks3 16 Figure 11.14 Main differences between HomeRF versions 1.2 and 2.0 11 Personal Area Networks (PANs) 11.1 Introduction to PAN Technology ... collocated networks by checking the access code field on the received packets which is different for every piconet, as we explain later. However, when a large number of piconets coexist in the same area, ...

Ngày tải lên: 29/09/2013, 21:20

... significant advantages or disadvantages characterize the high and low bands. The 2.4 GHz band stands in the middle, having the additional advantage of being the only one available worldwide. Currently, ... Telecommunications Administrations (CEPT) in the European Union. Licensing poses both advantages and disadvantages. A significant advantage is that immu- nity to interference is guaranteed. If ... MAC to provide security 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...

Ngày tải lên: 29/09/2013, 21:20

... /?Issue=34&IssueDate=04-01-2001&CP= 11/06/01 Date of Issue: 04-01-2001 CCNA Layer 2 Switching - Virtual Local Area Networks Lab Scenario by Leigh Anne Chisholm Introduction Preparing Your Switches Section 1...

Ngày tải lên: 19/10/2013, 02:15

... be found in the Unified 7 Enterprise Branch Wide Area Application Services Design Guide (Version 1.1) OL-12945-01 Introduction Figure 1 Wide Area Application Services (WAAS) Mechanisms The ... cache flows can be applied on the interface performing WCCP redirects. 22 Enterprise Branch Wide Area Application Services Design Guide (Version 1.1) OL-12945-01 WAAS Branch Design Considerations Branch ... hash buckets are synchronized within the service group, and the hash 49 Enterprise Branch Wide Area Application Services Design Guide (Version 1.1) OL-12945-01 Appendix B—Example Test Configuration Figure...

Ngày tải lên: 10/12/2013, 16:15

... 95134-1706 USA Enterprise Data Center Wide Area Application Services (WAAS) Design Guide This document offers guidelines and best practices for implementing Wide Area Application Services (WAAS) ... configurations because of its high availability, scalability, and ease of use. Table 4 shows the advantages and disadvantages of each interception method. Ta b l e 4 Interception Method Comparison Pros ... campus/data center. Various topologies for core WAE placement are possible, each with its advantages and disadvantages. WAAS is part of a greater application and WAN optimization solution. It is...

Ngày tải lên: 10/12/2013, 16:16

... s0/0 Chapter11 Wide Area Networking Protocols Introduction to Wide Area Networks WAN 是覆盖地理范围相对较为广阔的数据通信网络,它一般是利用公共载体(比如电信公司) 提供的设备进行传输.WAN 技术运行在 OSI 的最下 3 层 广域网 (Wide Area Network,WAN)的一些术语 ... Mode,ATM):国际电信联盟电信标准委员会(ITU-T)制 定的信元(cell)中继续标准.ATM 使用固定长度的 53 字节长的信元方式进行传输,ATM 网络的 面向连接的 Cabling the Wide Area Network Cisco 的串行连接支持几乎所有类型的 WAN 服务.HDLC,PPP 和帧中继使用相同的物理层定 义的接口,但是和 ISDN 的不一样.我们先来回顾下...

Ngày tải lên: 21/12/2013, 05:18

... Coaxial Cable-Based Ethernet To simplify the installation of Ethernet networks, a change was made to the network topology . Networks were converted from coaxial cable to twisted pair cabling by ... hub , networks became more crowded. A solution to the problem was necessary. Figur e 2. Hub-Based Twisted Pair Ethernet Ted Rohling, Global Knowledge Instructor, CISSP The Case for Virtual Local Area Networks ... or subnet. In most practical networks, all devices in a small business or enterprise network are not located on the same Ethernet network broadcast domain. W e separate the networks to limit broadcast...

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