Más contenido relacionado La actualidad más candente (16) Similar a Paul Ho - Wireless Infrastructure for Mobile e-Learning (20) Más de eLearning Consortium 電子學習聯盟 (20) Paul Ho - Wireless Infrastructure for Mobile e-Learning1. Wireless Infrastructure for Mobile
ELearning
- Implementing WiFi for Schools Without Compromises
Paul Ho
System Engineer
Cisco System Ltd.
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2. • Trends: The 21st Century Classroom
• Challenging
• High Dense Best Practices
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4. 2015 Global Mobile Traffic
7B Mobile Devices Will Grow 26x
Video Will Be 66% of All Mobile Traffic
Source: Cisco Visual Networking Index (VNI) Global Mobile Data Forecast, 2010–2015
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7. “Making appropriate
investments in computing
infrastructure is as
important as investing in
wiring or lighting..”
Dr. Mark Edwards
Superintendent
Mooresville Graded School District
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9. It changes how many expect to be connected wherever they are learning
Simple Secure Reliable
ANY USER ANY DEVICE
ANYWHERE ANYTIME
10. What is Wireless LAN?
A method of transmitting data over the air, in a LAN setting
Notice: this is NOT a Cellular mobile technology (like GSM, CDMA)
Wi-Fi – A trademark of the Wi-Fi Alliance
Wireless Fidelity, derived from the audio term High Fidelity (Hi-Fi)
The Wi-Fi Alliance certifies Wi-Fi products if they comply to 802.11
inter-Operability standards
IEEE 802.11 is a set of standards for WLAN communication
Standards that exist today:
Standard Band Bit-Rate
802.11a 5 GHz 54 Mbps
802.11b 2.4 GHz 11 Mbps
802.11g 2.4 GHz 54 Mbps
802.11n / MIMO 2.4 and 5 GHz Up to 450 Mbps (3x3)
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11. What is a WLAN Access Point (AP) ?
A Wireless Access Point connects the wired network to wireless
devices (stations)
Fat AP – AP with security and limited management capability in the
unit itself.
Translates signals and manages network transmission to/from the
wireless devices and the core network
Each wireless network is identified by a SSID (Service Set Identifier)
SSID
Internet
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12. • Coverage
In a typical office, Wi-Fi network transmitting distance can be 75-150 ft. W
Wi-Fi speed is decrease with the distance from the AP
Fast roaming technology is required for pervasive coverage
• Interference with other appliances, co-channels
2.4 GHz and 5 GHz, Public Spectrum, ISM band.
Microwave, cordless phone, baby monitors, security cameras, Bluetooth
devices, Amateur radio, video senders are all operated in 2.4GHz spectrum,
shared the band with Wi-Fi.
Jam with other APs at the same channel
• Security
Old Standard, WEP, Replace by new Standard IEEE802.11i/WPA2, much
safer now
• Capacity
Legacy 11b (11Mbps) Latest 11n (300/450Mbps) Coming 11ac (> 1Gbps)
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13. • High density wireless devices in the classroom
• 1-1 Computing
• Multiple devices per users
• Add more Access Point won’t solve this
problem, Why?
• Channel Limitations
• 3 non-overlapping channels in 2.4 GHz (11b or 11g)
• Co-Channel Interference
• 4-21 non-overlapping channels in 5 GHz (11a)
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14. • Holistic View of the
Network
• Centralization provides
Wireless Controller
perspective on Central
Management
relationships between
Switch/Routed
APs Network
• Enables optimal RF
calibration for a large
wireless network
• Maximize Wireless capacity,
minimize Interference and
effective client roaming
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16. • Get buy-in from parents,
school board, faculty
• Enlist tech-savvy teachers to
vet instructional technology
and create success stories
• Think about curriculum
changes, digital resources,
teaching
• Wireless network infrastructure
capacity
• Start with a pilot program to
determine feasibility of
allowing students to bring their
own devices to class
• Create “acceptable use policy”
• Teach students digital
citizenship
• Monitor test scores and
outcomes
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17. • Core network
• Wireless capacity and
Wifi access points
• Density
• Security policy
• Support model: assisted,
self-support
• How users will access
apps
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18. Most important thing for iPads
and BYOD is stable RF!!!!
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