wide area networks ppt

Ngày tải lên: 21/12/2013, 06:15

... 8-PSK – CDMA2000 1xRTT • Operates on two 1.25 MHz -wide frequency channels • Supports 144 Kbps packet data transmission 2 Objectives • Describe wireless wide area networks (WWANs) and how they are used • Describe ... pager, satellite telephone, and location services 41 Summary • In cellular telephone networks, the coverage area is divided into sections called cells • Cellular technology generations – First ... Mbps for a stationary user • 3G network technologies – CDMA2000 1xEVDO • For 2.5G CDMA2000 1xRTT networks 25 Binary Runtime Environment for Wireless (BREW) • BREW is a thin software environment – Very...

Ngày tải lên: 13/09/2012, 10:52

... 31 © 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 © 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 © 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

Ngày tải lên: 19/01/2014, 05:20

Ngày tải lên: 25/01/2014, 06:24

Ngày tải lên: 20/06/2014, 22:20

Ngày tải lên: 21/06/2014, 01:20

Ngày tải lên: 21/06/2014, 07:20

Ngày tải lên: 21/06/2014, 23:20

... 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) ... Traffic Server to Client Traffic WAE Farm VLAN 28 VLAN 29 5 9 8 6 7 31 Enterprise Data Center Wide Area Application Services (WAAS) Design Guide OL-12934-01 Design and Implementation Details For ... %LINK-5-CHANGED: Interface Loopback0, changed state to administratively down 45 Enterprise Data Center Wide Area Application Services (WAAS) Design Guide OL-12934-01 Implementation Details Note that the...

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

Ngày tải lên: 17/01/2014, 06:20

Ngày tải lên: 14/03/2014, 22:20

Ngày tải lên: 21/06/2014, 05:20

... shift to FIR speed Wireless Communications Low Rate Wireless Personal Area Networks 2 Objectives • Describe a wireless personal area network (WPAN) • List the different WPAN standards and their ... work • Describe the security features of low-rate WPAN technology 3 What is a WPAN? • Wireless personal area network (WPAN) – Group of technologies that are designed for short- range communications – Eliminates...

Ngày tải lên: 13/09/2012, 10:52

... a nanosecond long – Signal spreads over a very wide frequency band • 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 • IEEE ... to Wireless Communications 28 How UWB Works • UWB PHY – Digital signals need to be spread over a wide band • Using techniques such as FHSS or DSSS – UWB uses short analog pulses for signaling • Does...

Ngày tải lên: 13/09/2012, 10:52

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

Ngày tải lên: 13/09/2012, 10:52

... easily incorporate WiMAX networks 3 What is a WMAN? • Wireless metropolitan area networks (WMANs) – Provide wireless connectivity across a substantial geographical area such as a large city • WMANs ... 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 • Explain why wireless metropolitan area networks (WMANs) ... wired networks beyond a single location • Without the expense of high-speed cable-based connections – Extend user mobility throughout a metropolitan area – Provide high-speed connections to areas...

Ngày tải lên: 13/09/2012, 10:52

... nam l mt yu t ht sc quan trng. Gii phỏp mng WAN ( Wide Area Network - Mng din rng ) c ỏp dng. Chỳng cú nhim v kt hp tt c cỏc mng LAN (Local Area Network ) xa li thnh mt mng duy nht cú ng truyn...

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