1、 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1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 designSite Survey 验证无线网部署 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 2Determine Deployment Requirements
2、AssessDetermine AP Count & PlacementDeploy Place Access PointsSurvey WLANVerifyPlanningTools Site SurveyZ Factor部署方法 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 3 Protocol requirements802.11b/g802.11a Client devicesWNICPDAPhone Client densityTypicalPeak Expected t
3、hroughput802.11b is typically 2 Mbps802.11g is typically 11-14 Mbps802.11g is typically 2-4 Mbps with 802.11b clients presents802.11a is typically 11-14 Mbps部署需求容量考虑 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 4协议比较 The standards that must be supported by an enter
4、prise WLAN are usually dictated by the devices that require support. Currently 802.11b clients are predominant but what is right answer for your enterprise WLAN solution? 802.11bPro: Highest market penetrationCon: More interference & noise may be found in the 2.4GHz bandCon: Only provides 3 non-over
5、lapping channelsCon: Can suffer from multipath issuesCon: Client driver quality (consumer versus enterprise) 802.11gPro: Higher throughputPro: OFDM technology reduces multipath issuesCon: More interference & noise may be found in the 2.4GHz bandCon: Only provides 3 non-overlapping channelsCon: Throu
6、ghput degraded in the presence of 802.11b clients 802.11aPro: Higher throughputPro: OFDM technology reduces multipath issuesPro: Provides FCC 24 non-overlapping channelsCon: Lower market penetration 802.11nPro: MIMO/Channel combined/Packet Aggregation provide More Stable connection, higher performan
7、ce and longer distanceCon: Not finalized yetCon: Need more power 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 5 Coverage AreasFull or partial Coverage Hole Goal0% - 10% (Typically 2% 5%) Building Construction TypeTypical Offices (cubes and walled offices)Walled Off
8、ices (drywall office only)Walled Offices (brick and concrete walled offices)Other (example arenas, stock exchange, convention center, large warehouse) Building CharacteristicsHomogeneous same construction type throughoutCubes and walled offices throughout and/or floor to floorHeterogeneous mixed con
9、struction typesDrywall office area with shipping warehouse in back部署需求覆盖 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 6部署需求障碍物考虑Normal construction provides a myriad of wireless obstaclesDistant corners Walled officeareaBreak roomwith microwaveConcrete walls with i
10、ron rebarHigh mounting positionsMeeting roomwith high peak usersElevator shaft andstair wells 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 7部署需求提问 How many access points do I need?Purchase more AP than determined AP countAt best case, will allow over-deployment to
11、ensure seamless coverage and higher capacity allowing Cisco Airespace controller to compensate for overlapAt worst case, will cover unforeseen coverage hole Where should I place the access points?Place AP where WLAN clients will be locatedDo place AP in a meeting room as opposed to an adjacent hallw
12、ayDo place AP in a central location which can cover several walled officesDo not place APs in a wiring closetPlace AP in the middle of coverage areas How many controllers will I need?Provide enough controllers to perform the suggested high availability schemes available to provide enterprise reliabi
13、lity Where should I place the controllers?Place the controllers in different wiring closet to reduce power loss issues 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 8部署需求AP摆放Over cubicles outside of officesIn meeting roomwith high peak usersInside load bearing walls
14、Positioned to cover 2 rooms with non-load bearing walls 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 9企业无线网覆盖和容量80 ftBasic coverage, low cost Enterprise coverage & capacity60 ft802.11a: 11-14 Mbps802.11g: 11-14 Mbps802.11b/g: 2 / 2-4 Mbps802.11b: 2 MbpsGraphic is u
15、sing only 3 channels for interference avoidance 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 10企业无线网策略 Smaller, overlapping cells Increased average capacity802.11a can provide more channels to reduce interference Provides higher availability in the event of an AP f
16、ailure APs should not be placed too close together since clients will still transmit at normal power outputClients can cause interference issues with other APS and clientsEnterprise coverage & capacity60 ft802.11a: 11-14 Mbps802.11g: 11-14 Mbps802.11b/g: 2 / 2-4 Mbps802.11b: 2 MbpsGraphic is using only 3 channels to show option to avoid interference
