1. Presented by Ian Mearns FUSD

2. Fresno Unified School District 5,000 teachers & 4,000 support / administrative staff 75,000 students 110 schools and admin sites 1,000 wiring closets 2,000 switches 2,500 wireless access points

3. The Challenge How to move to a service model that Delivered faster service Was more robust Had less interference from other devices Had better security

4. Network Development 5 years ago point to point T-1’s Today AT&T Opteman with fiber to all sites 100meg or 500meg to each site

5. Traditional Model Switch ports available in every room One port per computer Static room layouts due to cable locations Challenges when reconfiguring room layout High cost to add wiring for additional computers Cost per user $69.00 per port plus wiring ($250)

6. Types of Access Points Autonomous Lightweight

7. Our Model Utilize existing drops for teacher desk One AP in every other room, also library, gym etc. Outdoor AP’s (2-6) depending on school size Controller based Provides campus wide coverage

8. Cost per Device

9. Our Clients Staff Students Parents Guests Hardware (projectors, HVAC controllers, security systems etc.)

10. How to Control Access In the Past Radius based control MAC address

11. How to Control Access Today Segregated SSID’s Authentication via AD Certificates EAP

12. How to Control Access In the near future Network Admission Control Authentication and vlan assignment based on device and user

13. Security Multiple SSID’s Directory Services Vlans

14. Designing High Availability Redundant Chassis Do not fully utilize every controller Configure AP’s to failover to other controllers Plan for number of controllers that can fail concurrently Consider cost of HA versus cost or impact of downtime

15. MIMO 40Mhz Channels Packet Aggregation Backward Compatibility Technical Elements of 802.11n MIMO 40Mhz Channels Packet Aggregation Backward Compatibility

16. Performance Aspects of 802.11n Beam FormingSpatial MultiplexingMaximal Ratio Combining MIMO (Multiple Input, Multiple Output) MIMO 40Mhz Channels Packet Aggregation Backward Compatibility Performed by Transmitter (Talk Better) Ensures Signal Received in Phase Increases Receive Sensitivity Works with non-MIMO and MIMO Clients MIMO AP HALLWAY Without Beam Forming Transmissions Arrive out of Phase With Beam Forming Transmissions Arrive in Phase, Increasing Signal Strength

17. Aspects of 802.11n Beam FormingSpatial MultiplexingMaximal Ratio Combining MIMO (Multiple Input, Multiple Output) 40Mhz Channels Packet Aggregation Backward Compatibility Performed by Receiver (Hear Better) Combines Multiple Received Signals Increases Receive Sensitivity Works with non-MIMO and MIMO Clients Performance Multiple Signals Sent; One Signal Chosen Without MRC Multiple Signals Sent and Combined at the Receiver Increasing Fidelity With MRC MIMO AP

18. Aspects of 802.11n Beam FormingSpatial MultiplexingMaximal Ratio Combining MIMO (Multiple Input, Multiple Output) 40Mhz Channels Packet Aggregation Backward Compatibility Transmitter and Receiver Participate Concurrent Transmission on Same Channel Increases Bandwidth Requires MIMO Client Performance stream 1 stream 2 Information Is Split and Transmitted on Multiple Streams MIMO AP

19. 20-MHz 40-MHz Gained Space MIMO (Multiple Input, Multiple Output)40Mhz Channels Aspects of 802.11n MIMO 40Mhz Channels Packet Aggregation Backward Compatibility Moving from 2 to 4 Lanes 40-MHz = 2 aggregated 20-MHz channels—takes advantage of the reserved channel space through bonding to gain more than double the data rate of 2 20-MHz channels

20. 40Mhz Channels Aspects of 802.11n Packet Aggregation 40Mhz Channels Packet Aggregation MIMO Backward Compatibility Carpooling Is More Efficient Than Driving Alone Without Packet Aggregation Data Unit Packet 802.11n Overhead Data Unit Packet 802.11n Overhead Data Unit Packet 802.11n Overhead With Packet Aggregation Data Unit Packet 802.11n Overhead Packet

21. Packet AggregationBackward Compatibility Aspects of 802.11n Packet Aggregation Backward Compatibility MIMO40Mhz Channels 2.4GHz5GHz 802.11ABG Clients Interoperate with 11n AND Experience Performance Improvements 11n Operates in Both Frequencies

22. Backward Compatibility & Co- Existence Co-existence of ABG/N APs Benefits of 11n accrue to ABG clients MIMO benefits ABG clients on the AP receive side from MRC 11n11g 11n 300 Mb 54 Mb 48 Mb 36 Mb 28 Mb WLAN Controller Backwards CompatibilityCo-Existence at Controller Level 11n11g 11n 300 Mb 54 Mb WLAN Controller Roam

23. Mixed Mode Performance 11n 300 Mb54 Mb 0 300mb WLAN Controller 11n 11g  3 Modes of operation supported Legacy Green Field Mixed  Mixed mode experiences slight performance impact due to ABG clients  11n clients still transmit at full performance  PHY and MAC for 11n provides co-existence and protection for ABG clients Capacity

24. Other Advantages 5GHz radios have more channels Results in less interference from radios using other channels Allows for higher density of AP’s

25. 11 1 1 6 1 6 6 1 6 153 36 149 161 149 4048 153 161 1 1 1 11