wide area networks by patrick regan

... 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 ... networks – Watch television or on-demand movies – Take and transmit pictures and short movies – Locate family members and employees using GPS 24 Java • Java programming language – Developed by ... 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...

Ngày tải lên: 13/09/2012, 10:52

... network edge Potentially discarded by Weighted Random Early Detection (WRED) (congestion mgmt) Assigned to the appropriate outgoing queue Scheduled for transmission by CBWFQ and sent out interface Classify ... on. CAR can also be used to police precedence bits set externally to the network either by the customer or by a downstream service provider. Thus the network can decide to either accept or override ... the level of congestion Generic Traffic Shaping (GTS) shapes traffic by reducing outbound traffic flow to avoid congestion by constraining traffic to a particular bit rate using the token bucket...

Ngày tải lên: 11/12/2013, 14:15

... coordinate ToS byte (DSCP/IP Precedence) markings and bandwidth allocation. Ta b l e 2 QoS Configuration Options Shaping by Port Shaping by Logical Interface Shaping by Branch Shaping by VLAN Shaping ... and Wide Area Networks OL-14760-01 Design Considerations • Use of EIGRP stub areas eliminates queries to spoke routers. • OSPF must periodically synchronize router databases within an area, ... each See by class/VLAN VLAN per branch with one shaper per class See Scalability and Performance Results, page 40 20 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 ...

Ngày tải lên: 21/12/2013, 06:15

... 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 ... networking technologies • Public key infrastructure (PKI) – Unique security code, or key, provided by a certificate authority • Certificate authority – Private company that verifies the authenticity ... is a wireless technology that uses short- range radio frequency (RF) transmissions – Supported by over 2,500 hardware and software vendors 6 Infrared WPANs (IrDA) (continued) 15 Bluetooth Link...

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 ... Communications 12 802.15.3 Network Topology • Piconet coordinator (PNC) – Role assumed by the first device in the area – Provides all of the basic communications timing in a piconet – PNC sends a...

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) ... spatial variations in light intensity caused by atmospheric turbulence 18 IEEE 802.16 (WiMAX) • Standard for wireless broadband metropolitan area networks • 802.16 supports enhancements and extensions...

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

... currently Personal Area Networks (PANs) 309 Figure 11.7 A scatternet formed by four piconets wireless headsets), the level of security decreases due to the fact that the chosen PIN, which is either entered by ... 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, ... collocated networks to transmit on the same hop at the same time is small. Still, if such a case occurs, a device can recognize and thus ignore packets originating from collocated networks by checking...

Ngày tải lên: 29/09/2013, 21:20

... 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 ... be supported by both technologies and is thus characterized by a moderate cost. However, the situation reverses when noise and interference are taken into account. From Wireless Networks2 50 above ... DSSS signal has a rate of 11 Mbps. Multiple networks can coexist in the same area provided they use subchannels with center frequencies separated by at least 30 MHz in order to avoid interference. Extending...

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 - Configuring ... exec mode by issuing the command enable A "# "prompt will be displayed. 3. To begin configuring the switch name, IP information, and password; enter global configuration mode by issuing ... between switches. Begin this part of the lab by configuring SwitchB. 1. On SwitchB, enter global configuration mode from the privileged exec mode prompt by issuing the command configure terminal The...

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 ... tuned so that its MSS is best suited for the type of WAN link at the branch. Wide area file services are also affected by the BDP and need to be tuned for its established sockets to be used most ... WAEs. Multiple edge WAEs can be configured in a cluster. By default, load balancing is done by round-robin, although it can be done by source and destination IP address. As an observation,...

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) ... Promotion of the standby Central Manager to the primary Central Manager is configured from the CLI of the standby Central Manager by changing the Central Manager role from standby to primary. When ... default gateway pingable, which is accomplished by configuring the WAE VLAN interface as a management interface: 24 Enterprise Data Center Wide Area Application Services (WAAS) Design Guide OL-12934-01 ...

Ngày tải lên: 10/12/2013, 16:16

... }; key <MENU> { [ braceright ] }; By browsing the file you can find all the other symbols and what they do. You can also add multiple functions to a key, by using ALT and SHIFT. The changes ... automatically by the kernel. One case where they would not be detected is if the device is Plug and Play. The kernel won't be able to detect ISA PnP devices unless they have been prepared by a program ... the lilo.conf file and enable changes. 100 Linux Tips and Tricks 33 100 Linux Tips and Tricks by Patrick Lambert Tip 4: Installing with no CD-ROM drive or modem Most Linux distributions come...

Ngày tải lên: 21/12/2013, 04:18

... 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 ... disconnect int bri0:断开连接.和在接口使用 shutdown 命令效果是一样的 Postscript Noko#sh run ! Written by 红头发 a.k.a. Noco Description 欢迎转 po,请保留作者信息 Mar.26th.2004 ! Special thanks Noko & all...

Ngày tải lên: 21/12/2013, 05:18

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