Microsoft PowerPoint - WLAN Semi

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					Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

             Presented by:
             Mr. Ken K.K. Fong B.Soc Sc (HKU), M.Sc. (I.M), MBA, MCIM, CM,
             MHKMA, MHKCS, Chartered IT Professional, Chartered Marketer

             Vice Chairman, Hong Kong Wireless Technology Industry
             Association (WTIA)
             Board Member, Radio Spectrum Advisory Committee, OFTA
             CEO, Synergy Technology (Asia) Ltd
             CIO, Fortune Telecom Holding Ltd.

Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

 - Introduction to WTIA
 - Introduction to Wireless Network
 - WLAN Frequency Spectrum Allocation
 - About WLAN and Wi-Fi Standard
 - Findings from the Focus Group Meeting
 - Tips on hardware requirement, site survey, vendor and
 quotation selection & acceptance
Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

       Introduction to WTIA
Objectives of WTIA
Not-for-Profit Corporation registered in HK since
  2001 with objectives:
  To promote the development, usage and
  awareness of wireless technology applications
  in Hong Kong
  To represent and safeguard the interests and
  opinions of the wireless technology to the
  Government and other international parties
  To enhance communication and partnership
  between different types of companies in the
  wireless technology industry
Activities of WTIA
 has over 100 local and overseas company members,
 including mobile network operators, mobile device
 manufacturers, wireless technology providers, system
 integrators, wireless application services developers,
 consultancy firms, etc.
 has organized different types of activities, including
 conference, seminar, workshop, competition, exhibition,
 etc. to accelerate the industry development.
 Annual War Driving event (WLAN Security Survey)
 manage the Wireless Development Centre (WDC) at
 Cyberport under the support of ITF fund
Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

  Introduction to Wireless Network
Wireless Network Area Definitions
                                           Courtesy of IEEE 802.15
                                           Press Kit. Jan. 2001
     WAN                                              Bluetooth
                     MAN               IEEE802.11

      ~50km       ~2km                     0km          ~10m
                                                                     everywhere outside of the

   GPRS, 3G – UMTS
                                          Wide Area                  hotspots, where wireless
                                                                      Internet connection are
< 400 Kb/s – xx Mls, Kms                                                     provided

                                 Metropolitan Area                  Building to Building
MMDS; LMDS; 802.16                                                      connection
10M > 155 Mb/s - Kms
                                          Local Area
  802.11b; 802.11a; 802.11g                                  collection of secure “hot
 2M > 54Mb/s – > 300 ft, 100 m                                  spot” connections,
                                    Personal Area             providing broadband
                                                              access to the Internet

             < 800 Kb/s – < 30 ft, 10 m                     PAN:
                                                    collection of secure
                                                   connections between
                                                        devices in a
                                                     “very” local area
Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

     WLAN and RF Frequency
      Spectrum Allocation
  The Electromagnetic Spectrum
               Short Wave Radio    FM Broadcast
                AM Broadcast         Television             Infrared wireless LAN


Extremely Very Low Medium High Very Ultra Super Infrared Visible Ultra- X-Rays
   Low    Low                  High High High             Light violet

                                   2.4 – 2.4835 GHz
          GSM:                                                       5 GHz
                                  802.11b (11 Mbps)
   US ISM: 902-928 MHz                                         802.11a (54 Mbps)
                                  802.11g (54 Mbps)
the Radio-frequency Spectrum
 9 kilohertz and 300 gigahertz
 Common Known RF Bands
   FM Broadcasting: VHF
     e.g. CR1 88.1;88.3;88.6 etc
   Television: UHF
     e.g. TV CH21 471.25(V)/477.25(S) MHz
   Cellular/Mobile: 900MHz; 1800MHz
   WLAN: 2.4GHz and 5Ghz
Standard and Regulatory in HK
 IEEE Standards
    802.11b / 802.11g
       3 non overlapping channels in HK
       2.4-2.4835 GHz
       12 non overlapping channels in HK
       5.15-5.25 (4); 5.25-5.35 (4); 5.75-5.85 (4-5)
 Worldwide Regulatory Progress
    ITU World Radio Conference (WRC-03)
    Agenda Item 1.5: set a global allocation: 5.15-5.35; 5.47-5.725
    Total 455Mhz
    Plus existing 5.75-5.85 > 580Mhz; i.e. 24 non-overlapping channel
    in 5GHz
2.4GHz Spectrum and the
           5GHz Spectrum and the 802.11a
    5GHz             5.15          5.25          5.35     5.470                     5.725        5.825
  UNII Band
                            4 Ch          4 Ch                         11 Ch                4 Ch

  US (FCC)
 12 Channels            UNII-1        UNII-2                                            UNII-3
  (*can use up to           40mW      250mW                                                 1W
6dBi gain antenna)

 19 Channels                   200mW                                    1W
  (*assumes no
  antenna gain)

                       UNII-1: Indoor use, antenna must be fixed to the radio
                       UNII-2: Indoor/Outdoor use, fixed or remote antenna
                       UNII-3: Outdoor bridging only

*if you use a higher gain antenna, you must reduce the transmit power accordingly
Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

       Focus Group Meeting
Findings from the
Focus Group Meeting
 A Focus Group Meeting (25/10/2004)
 has been called by EMB and WTIA upon
 9 Pilot Schools that has implemented
 WLAN during the past 2 years
Findings from the
Focus Group Meeting
 Interesting Findings
   Have the right expectation of the WLAN functions,
   applications and coverage
   Selecting a partner but not a vendor
   Have a selection plan (Scorecard) for the system and
   Plan for a whole coverage but can start with a smaller scale
   A must for those open area group activities
   Explore the true value, contents and killer applications of the
Findings from the
Focus Group Meeting
 Interesting Findings
   Selecting Enterprise class network or small soho
   WLAN network
   Choose the right standard (a, b or g?)
   Cost is not the only selection factors
   Don’t under-estimate the importance of privacy
   and Security Measure
   Compatible with different brand and model
   Site Survey is important
Building Wireless Campus
Infrastructure: Selection,
Considerations, Deployment

    Tips on hardware requirement,
  site survey, vendor and quotation
        selection & acceptance
WLAN Selection Criteria
 Select the right standard and protect your investment: 802.11
 a/b/g or …
 Stable and able to work even in non-air conditioned
 Good Performance for support of large numbers of simultaneous
 Enough capacity and power for future upgrade
 Good wireless coverage, enough radio output power and able to
 add external antenna
 Powerful security
     e.g. WPA2/IEEE 802.11i and proactive rogue AP and client
     Support multiple VLAN
 Quality of service for voice and video applications
     IEEE 802.11e
WLAN Selection Criteria
 Simple to deploy
    e.g. Automatic channel selection, transmit power control for
    cell sizing
    e.g. Support IEEE 802.3af POE
 Centralized configuration and monitoring
 Support WDS in case cable laying is not possible
Performing a Site Survey
 Site Survey Focus
   Signal Coverage
   Network Capacity
   RF Interference
   Power Requirement
 Gathering Requirements
Performing a Site Survey
 Site Survey Document
   Site Maps
   Pre Site Survey Forms
   Interview forms
   Resource-list forms
   Network Diagram
Performing a Site Survey
 Conducting a walk through
   Armed with the pre-survey information and the map,
   physically inspect the areas, confirm the information
   gathered and update the site plan to include any additional
   objects that may block or reduce RF
Performing a Site Survey
 Drafting a WLAN site design
   Addressing also
     Signal Coverage; Network capacity; RF Inference; Power Requirement
     Indoor range of DSSS vs. Outdoor Range of DSSS
     Plan for the roaming
     Avoid overlapping AP cells of the same channel
     Consider using directional antennas to cover irregular areas, and long
     narrow areas; otherwise, use omni directional antennas
     Indoor: Suspend AP or external antenna from ceiling
     Multi-floor: start with the top or bottom . Moving door or up one floor
     at a time. Consider the spherical shape of the signal, as well as
     attenuation by building material in floor or ceilings, when you are
     computing overlap between cells on adjacent floors.
Performing a Site Survey
   use Vendor provided client manager (link
   test, history, signal and noise)
   save results on local disk, or record on tally
   Look for noise spikes
Performing a Site Survey
   examine returned Link Quality Assessment
   determine best location Servers and/or APs,
   determine floor coverage
   Avoid Interference:
     Microwave Oven
     Other ISM Wireless Devices
     Electrical Devices
     Passive System
 Document results
Vendor Selection Criteria
 Reputable and healthy financial background
 Ability to provide total and turnkey solution
 In business in the community for years
 Depth of know how (both wireless/RF technology and education)
 Employee Profiles
 Size of Customer and References
 Provide future upgrade path
 Ensure it provide direct local service
 Know the warranty period, warranty type, term and the rate
 Provide good hotline support, speedy remote support and
 Price and quality of the Site Survey/proposal/presentation
Tips for the quotation
 Ask for a site visit and survey before quote
 Give your detail expectation on the use and coverage and
 should provide your detail floor plan
 Breakdown the cost into hardware, software, cabling, training
 and implementation
 Preferable to ask them quote brand reliable name: Don’t let’s
 them fail you at critical time
 Start to compare rate and negotiating
 Compare between Quotation apple to apple
Tips for the quotation
 Don’t just based on cost but also give score based on other
 selection factor
 If there is big cost difference, discuss to make sure your
 understand them
 Is your selected proposal meet your budget? Share with them at
 this point. But be realistic, “you get what you apy for”.
 Ask for hidden or running cost. Best if they can provide you 3
 years TCO.
Tips for the acceptance
 2nd Site Survey after the installation
 Ask vendor to provide deliverable information
   Access Points Location Diagram
   Transmit Power and Antenna Information
   Signal Strength Diagram
   Signal-to-Noise Ratio Diagram
   Interference Diagram
   Data Rate Diagram
   Using Professional Site Survey
Tips for the acceptance
 Load Testing for Max. Concurrent Users
 Checking WLAN Health with Analyzer
   Transmission speed, network traffic, network
   throughput, average packet size, CRC Error
   frequency e.g. Airopeek
 Checking for the Security
   Setting e.g. Turn on WEP, Radius etc
   Finding Rogue WLAN
   Physical Security??
For more Information

    email to
Thank You

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