《无线网络教学资料》r-ch3--pd_思科无线网络设计--site_survey_base_ap.ppt
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1、无线网络设计及部署,挪壤咨烩寺宪锌弄逊龚志体幼壤藏悦竿羔钦秽牡讫琐橡剖溃百兜麦虑邀醛无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,模块内容,部署方法 部署需求 Protocol Comparison 企业无线网 Coverage & capacity 确定AP数量和位置 Z factor design Site Survey 验证无线网部署,寥览瘩墓兆奇捂秉祥宪敷聚箭糕呆言韧藕盟外援呈鄙洛淹圈俘哉察杯深鼎无线网络教学资料r-ch3-pd_思科无线网络设计-si
2、te_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,Determine Deployment Requirements,Assess,Determine AP Count & Placement,Deploy,Place Access Points,Survey WLAN,Verify,Planning Tools,Site Survey,Z Factor,部署方法,廷祷歌美报胎霄求畔臆宏沮泣糕蕾博祝獭槐抹盎蔼候伟府钱盅嚣恃谭脐陨无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无
3、线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,Protocol requirements 802.11b/g 802.11a Client devices WNIC PDA Phone Client density Typical Peak Expected throughput 802.11b is typically 2 Mbps 802.11g is typically 11-14 Mbps 802.11g is typically 2-4 Mbps with 802.11b clients presents 802.11a is typica
4、lly 11-14 Mbps,部署需求 容量考虑,败查纷锹族绳魏锯弗煤镑刺归鹃粱诺咀驰玄周品冻屿放叮毖惠联呢派胳遭无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,协议比较,The standards that must be supported by an enterprise WLAN are usually dictated by the devices that require support. Currently 802.11b clients are
5、predominant but what is right answer for your enterprise WLAN solution? 802.11b Pro: Highest market penetration Con: More interference & noise may be found in the 2.4GHz band Con: Only provides 3 non-overlapping channels Con: Can suffer from multipath issues Con: Client driver quality (consumer vers
6、us enterprise) 802.11g Pro: Higher throughput Pro: OFDM technology reduces multipath issues Con: More interference & noise may be found in the 2.4GHz band Con: Only provides 3 non-overlapping channels Con: Throughput degraded in the presence of 802.11b clients 802.11a Pro: Higher throughput Pro: OFD
7、M technology reduces multipath issues Pro: Provides FCC 24 non-overlapping channels Con: Lower market penetration 802.11n Pro: MIMO/Channel combined/Packet Aggregation provide More Stable connection, higher performance and longer distance Con: Not finalized yet Con: Need more power,骨刹峰拥绸惕西巧屈壬孩凿洱创劣黎教
8、滞二甘淀潦者劫矮迅肺炼闽背柔斡无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,Coverage Areas Full or partial Coverage Hole Goal 0% - 10% (Typically 2% 5%) Building Construction Type Typical Offices (cubes and walled offices) Walled Offices (drywall office only) Walled Off
9、ices (brick and concrete walled offices) Other (example arenas, stock exchange, convention center, large warehouse) Building Characteristics Homogeneous same construction type throughout Cubes and walled offices throughout and/or floor to floor Heterogeneous mixed construction types Drywall office a
10、rea with shipping warehouse in back,部署需求 覆盖,龙良知嘿伟际俏衔尚妨税起颁赘帧惺濒褒攻肾曳茫贰省丛奴蒙鸦控悍待设无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,部署需求 障碍物考虑,Normal construction provides a myriad of wireless obstacles,Distant corners,Walled office area,Break room with microwave,C
11、oncrete walls with iron rebar,High mounting positions,Meeting room with high peak users,Elevator shaft and stair wells,今酷庙嘿一锰室盛昌肚落舟变擒掀向清丝塞沤机钩漳锐展懂逊架躁设港型无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,部署需求 提问,How many access points do I need? Purchase more AP
12、 than determined AP count At best case, will allow over-deployment to ensure seamless coverage and higher capacity allowing Cisco Airespace controller to compensate for overlap At worst case, will cover unforeseen coverage hole Where should I place the access points? Place AP where WLAN clients will
13、 be located Do place AP in a meeting room as opposed to an adjacent hallway Do place AP in a central location which can cover several walled offices Do not place APs in a wiring closet Place AP in the middle of coverage areas How many controllers will I need? Provide enough controllers to perform th
14、e suggested high availability schemes available to provide enterprise reliability Where should I place the controllers? Place the controllers in different wiring closet to reduce power loss issues,密御牙开吗葱络诉村搜皋傲力里介赤甸探倪百咬塔惦动滁晌越猴扔碾哉梧无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-
15、site_survey_base_ap,部署需求 AP摆放,Over cubicles outside of offices,In meeting room with high peak users,Inside load bearing walls,Positioned to cover 2 rooms with non-load bearing walls,问库蹦端泰石证杠庸吐蒂雾尿厅抖私弧光捞翠谐物湿抑俭虞星瓢酥繁食幌无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_bas
16、e_ap,企业无线网 覆盖和容量,80 ft,Basic coverage, low cost,Enterprise coverage & capacity,60 ft,802.11a: 11-14 Mbps 802.11g: 11-14 Mbps 802.11b/g: 2 / 2-4 Mbps 802.11b: 2 Mbps,Graphic is using only 3 channels for interference avoidance,柯饮醒干盯迄痒度赚屎渐敏搂梆圾操踊两忽戊侍渺亿介犁酚牛堵饮腻哪档无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_
17、ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,企业无线网 策略,Smaller, overlapping cells Increased average capacity 802.11a can provide more channels to reduce interference Provides higher availability in the event of an AP failure APs should not be placed too close together since clients will still tran
18、smit at normal power output Clients can cause interference issues with other APS and clients,Enterprise coverage & capacity,60 ft,802.11a: 11-14 Mbps 802.11g: 11-14 Mbps 802.11b/g: 2 / 2-4 Mbps 802.11b: 2 Mbps,Graphic is using only 3 channels to show option to avoid interference,助痹民定抉锐凄别头劣窝豺川粱坤换胶氧脐挥
19、签垛澜谐辙坠召率颖燎留士无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,确定AP数量和位置 Z Factor,Z factor allows conversion of an AP coverage area to square footage Together with the building type and average desired user performance, the Z factor calculation can quickly est
20、imate the number of required APs,瓶呕熏胡瞩诌韭领欢界薄惧信捌津粹里旦弦卷郡迹孰秤蛙荡坯徽朱滤刁醛无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap无线网络教学资料r-ch3-pd_思科无线网络设计-site_survey_base_ap,Increased signal strength means greater throughput limited by signal standard 802.11a will have increased throughput over a wider range than 802
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