converged communications (ccwg) (166376737)

7/29/2019 Converged Communications (CCWG) (166376737)

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Deploying 802.11n Pilot

Tammy Closs

Bob Johnson

Kevin Miller



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Introducing Duke

• Research & teaching – Medicine, nursing, basic sciences, genomics,

clinical trials

– Engineering

– Social science, divinity

– Environmental science

– Law, Business, Public Policy

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Hospitals, clinics• Student life: athletics, residential life

• Auxiliaries



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Metrics

• 5,500 undergraduate

• 6,500 graduate

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8,000 faculty• 22,000 staff (incl. medicine)

• 8,600 acres – 1,200 developed

• 48,000 wired ports (excl. medicine)• 7TB+/day to/from Internet



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Campus Maps



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Backdrop for 802.11n

• Duke Digital Initiative

– Inspired new uses for technology in

academics

• Strategic Plan: Making a Difference

– $1.3B over 5-8 yrs (2nd yr)

• Teaching & Learning Center

– Classes as performances

– Primary access: wireless or wired?



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Business Drivers

• Increase in wireless

connectivity

• Decrease in wired use

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Public wired ports(library) completely

unused

• Increased need for

mobility

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Current infrastructure

1700 APs

+800 APs – Res. Halls

11 WiSM

60% Coverage



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802.11n First look



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Pilot Environment

• Epworth Residence Hall

– 16K S.F.

– ~55 students, faculty-in-residence

– Previously hotspot-only 802.11b/g

• Qty. 8 – AP1252 (2.4GHz + 5GHz)

• Dedicated 4402 (code eval)

• 3750G + 802.3at PoE injectors



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Intensive Testing



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Experiences

• 40%+ connecting with 802.11n

– MacBook

– Dell, Lenovo, others

• 129Mbps+ peak throughput (11n clients)

• 802.11g client: 2x faster on 11n AP

compared to 11g AP

– Especially pronounced at greater distances



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Next Steps

• Campus-wide 802.11n rollout over next 6-9months – 1:1 swap of existing 802.11a/b/g APs

– Completing wireless deployment in reshalls

• All new laptops to have 802.11n radios

• Prioritizing locations – Teaching and learning spaces

– Greenfield opportunities (“New Campus”)

• Risk mitigation – 802.11n standard

– PoE, GbE connectivity



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Financial Considerations

• Evaluation of funding approachfor wired and wirelessnetworks

– Wireless installed with one-time

funds – Wired network: ongoing refresh

budget

• 802.11n upgrade: advancingplanned 4 year refresh cycle

• Observation: wired networksize decreases, yet cost perport will increase (GbE, 10GbE)

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Wired Network - Expenses v. Size

Wired network expenses

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Wireless Network - Expenses v. Size

Wireless network expenses

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Future

• Experimenting with HDTV-over-WiFi

• Preparing for phase-out of 802.11b

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Legacy devices v. leading edge• Refresh issues with Auxiliaries (inventory, PoS)

• VoWiFi

– Location, E911



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Questions

• Future of wired VoIP phones?

• Future of wired ports?

• Laptop backup on wireless network?• Gaming – suitable over wireless?

• Multicast applications on wireless? (IPTV)

• Wireless security & usability



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W W W . O I T . D U K E . E D U•

Contact Information

• Bob Johnson

– [email protected]

– +1 919 668 1762

• Kevin Miller

– [email protected]

– +1 919 668 6484

mailto:[email protected]




converged communications (ccwg) (166376737)

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