wireless mobile networking update l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Wireless / Mobile Networking Update PowerPoint Presentation
Download Presentation
Wireless / Mobile Networking Update

Loading in 2 Seconds...

play fullscreen
1 / 45

Wireless / Mobile Networking Update - PowerPoint PPT Presentation


  • 163 Views
  • Uploaded on

Wireless / Mobile Networking Update. Chad Burnham, Shannon Valerio & Byron Early University Technology Services April – 2002 – CHECO Spring Conference. DU’s Laptop Learning Model:. Undergraduate Laptop program in place since Fall ’99

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Wireless / Mobile Networking Update' - fleta


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
wireless mobile networking update

Wireless / Mobile Networking Update

Chad Burnham, Shannon Valerio

& Byron Early

University Technology Services

April – 2002 – CHECO Spring Conference

du s laptop learning model
DU’s Laptop Learning Model:
  • Undergraduate Laptop program in place since Fall ’99
  • Students learn to utilize technology WHILE learning educational content
  • ‘01-’02: All undergrad & MBA students required to have laptops with wired 10/100 Ethernet card.
    • Laptops showing up with 802.11b cards built in. Students are asking about where & how on campus.
  • ~5000+ student laptops on & off DU network
  • ~150-200 faculty use laptops via departments, grants (some self funding)
the ricks center du s private k 8 school
The Ricks CenterDU’s private K-8 school
  • First wireless system was proprietary infrared technology: Summer 2000
    • NOT VERY SUCCESSFUL.
  • Recently moved to:
    • 4 x 802.11b Access Points
  • 72 Laptops Provided by Center
  • Next Year:
    • Recommending 7-8th Grade bring own
  • Group & individual research flexibility
  • Web Publishing application
  • E-mail
  • Lower bandwidth type applications
rick center continued
Rick Center: Continued
  • Purchased mobile Dell Cart to secure units
penrose library
Penrose Library
  • 10 802.11b Access Points Installed
  • Redefining the library….
  • Provides for wireless access for students, staff and faculty in library
  • VPN must be used – Summer ‘02
laptop technology in du s curriculum
Laptop Technology in DU’s Curriculum
  • Wireless network access is an overlay network service designed to provide physical flexibility in:
    • Open Areas – “Hot Spots” (inside & outside)
    • Wired Classrooms
  • Center for Teaching and Learning (CTL)
    • Academic grants used as incentives for divisions to ‘convert’ to digital media.
  • DU’s Blackboard On-line Class Implementation
    • Homework, Syllabus, Class Notes, PowerPoint Slides, quizzes.
wireless technology concerns @ du
Wireless Technology Concerns @ DU
  • Bandwidth limitations:
    • Slower performance than wired 10/100 mpbs switching
  • Privacy & Security
    • Encryption & Authentication
    • Network Snooping – Separate VLANs for Wireless networks (not ‘on-top’ of existing)
  • Technical Support:
    • Card Installs: its all about the “DRIVERS” 
    • VPN Software: Installation/configuration
    • User password issues (Single Sign-on)
      • AD / LDAP / Kerberos?
wireless technology concerns @ du continued
Wireless Technology Concerns @ DU - Continued
  • Evolving/changing wireless technologies & PC operating systems:
    • Incompatibilities with installed base
    • Upgrade costs
  • Rouge Access Points – Dept Installed
    • Security Issues – Network Access
    • Performance Issues (Duplex)
    • CDW ad: “I can do wireless”, “what is wireless”?
    • Top Level policy needed
wireless network benefits for du
Wireless Network Benefits for DU
  • Convenience
  • Places you cannot wire
    • Historical buildings
    • Access problems
    • Cannot get fiber uplink to
  • Flexibility physical group learning models
    • New type of “smart-classroom”
the rf site survey
“The RF Site Survey”
  • Can use outside firm or do in-house
    • ~$100 per/hr per/person
    • DU tried 2 different firms – limited use now
  • Dictates # of APs and placement of APs
  • Direct driver of total cost of ownership
site survey recommendations
Site Survey Recommendations
  • Use 3 people to do the surveys:
    • 1 person @ proposed base area with AP & various antenna types
      • Changing Antennas type/position/location
      • Documenting results
    • 2 people on wireless laptops (w/802.11x radio) & handheld radios
      • Documenting SNR (in software) – to be overlaid on to maps/floor plans.
  • Do not do survey from blue-prints
    • New buildings: with furniture and people present
antenna placement
Antenna Placement
  • Do not place antennas near metal objects
    • Wave degradation issues
    • Railings, I-Beams, Lath, Etc.
  • Separation important
  • Think 3D (patterns vary by antenna type)
  • Away from wall if possible
  • Keep coax / LMR waveguide to minimum length
    • Move the data cable & AP before making coax longer
  • Inside buildings: choose antenna patterns that confine RF signal (unless desired)
wave guide lmr coax
Wave Guide / LMR COAX
  • Cabling from Antenna to Access Point
  • LMR 200/400/600/800, etc. = Size & Loss Properties
    • LMR have very low signal loss properties
    • Times Microwave is industry leader in cable, prep tools, and connectors. Others in market space under other names
    • Newer Balun (75 <-> 50 Ohm) & Amplifier combo units available to deliver over cheaper RG-6 Coax
  • Every Db matters in link budget!
antenna variables to look for
Antenna Variables to look for:
  • Beam Coverage:
    • Horizontal & Vertical (in degrees)
  • Antenna gain: rating in Dbi.
  • Size/Shape
  • Aesthetics
    • Remember: must have line of sight!
  • Cost
  • 2.4 GHz rated (802.11b)
rf its all in the antenna
RF: Its all in the Antenna….
  • Parabolic Grid Antennas
  • Radome-Enclosed Yagi Antennas
  • Omni Directional Antennas
  • Patch Antennas (Bow-Tie)
  • Planar Array Panel Antennas
  • Heavy-Duty Panel Antennas
  • Mobile Antennas
  • Indoor Ceiling-Mount Antennas
  • "Rubber Duck" Antennas
a parabolic grid antennas
A. Parabolic Grid Antennas
  • Reflector grid antenna designed for long-range operation (line of sight & <7 mile) and can be configured for either vertical or horizontal polarization. UCONN Story.
  • Heavy-duty yet lightweight construction and a UV-inhibited powdercoat finish.
  • Know your “Beam Pattern” or “Coverage”
    • Horizontal/Vertical discussion
b radome enclosed yagi antennas
B. Radome-Enclosed Yagi Antennas
  • Radome-enclosed yagi antennas combine high gain and wide beamwidth in a compact package.
  • Solid aluminum boom and elements enclosed within a white UV-inhibited radome for all-weather operation
  • “Pringles-Can” / War Driver article…
d patch panel antennas
D. Patch/Panel Antennas
  • Patch antennas are suitable for indoor and outdoor use. They are designed to be compact and aesthetic.
  • Narrow and wide beam avail.
    • Point to Point vs. AP
    • “Bow-tie” beam pattern
  • Low Price
e f planar array panel antennas
E/F. Planar Array Panel Antennas
  • Offers an attractive solution (aesthetics) for fixed subscriber and base station applications,
  • High performance alternative to Yagi-style antennas
  • Low Price
  • Indoor/Outdoor
g mobile antennas
G. Mobile Antennas
  • Feature a variety of gain, radiation pattern and physical mounting options.
  • Moving Vehicle Applications
h indoor ceiling mount antennas
H. Indoor Ceiling-Mount Antennas
  • Ceiling-mount antennas are high performance, aesthetic and nearly invisible against a suspended ceiling.
  • ~3db gain
i rubber duck antennas
I. "Rubber Duck" Antennas
  • Perfect for portable applications and as replacement antennas for many popular access points
  • Laptops with built-in antenna $1100-$2000 price range today
active ethernet poe
Active Ethernet (PoE)
  • Active Ethernet eliminates 110v AC outlet installation @ AP.
  • “Injects” DC power onto the Ethernet (CAT5/5e/6) cable on Pins 7&8 (unused by Ethernet .
  • 19” Rack Mount - 12 / 6 / 1 Port Available.
  • Cisco WS-3524-PWR - WILL NOT support this feature with out “Injector” hardware. (prop scheme)
  • Watch for 802.3ae!! 3COM 1st out of gate.
wireless lan wan 802 11b
Wireless LAN / WAN - 802.11b
  • Today’s predominant wireless ethernet IEEE Standard
    • 2.4 GHz Carrier Frequency
    • Uses “Direct Sequence” Radio Scheme
    • Signals @ 4 speeds:11, 5.5, 2 & 1 Mb/sec
    • 14 Channels/frequencies within 2.4 GHz
    • Only 3 channels do not overlap (1, 6 & 11)
    • Largest market share today
    • Uses: for Pt-Pt, Pt-MPt & LAN Applications
802 11b security access osi layers 1 2
802.11b: Security & AccessOSI Layers 1 & 2
  • ESS (Network) ID: Text Constant Variable
    • Standardized names by Summer ’02
      • Users can’t match name to location….
      • Moving from current 5 names to 1 standard
    • Orinoco Implements an Open / Closed setting:

Windows XP uses to help configure network.

      • CLOSED = Does not broadcast ESSID
      • OPEN = ESSID Broadcasted = **DU USING NOW**
802 11b security access osi layers 1 2 cont
802.11b: Security & AccessOSI Layers 1 & 2 – Cont.
  • MAC Address Registration (on APs)
    • Cumbersome & high management overhead
    • Must re-enter if card is swapped out
    • DU tried on 3 networks…...it’s over
  • Not using L2 WEP Key encryption
802 1x eap layer 2 authentication
802.1X - EAPLayer 2 Authentication
  • Drafts 7,8 & 10 on table – None Approved Today.
  • WEP works WITH 802.1X
  • Solution for Wired Network:
    • Cisco CAT OS 6.x+IOS 12.1+
encryption options
Encryption Options:
  • Layer 2 – WEP (hardware based)
  • Easily deciphered with sniffing software
    • WEP Key is “Static”
  • Dynamic WEP – Solves static key problem
    • Evolving standard – proprietary methods today
  • DU transitioning to VPNs (IP Sec) now
802 11b encryption access using vpns
802.11b: Encryption & Access Using VPNs
  • VPNs: DU using Cisco 3030s to terminate VPNs
    • Configured for IPSEC-3DES – 168Bit
  • VPN Client software leverages a back-end USER database for AAA functionality
    • RADIUS: Radiator on Solaris 8
  • Cisco / DU Branded VPN Software for:
    • Windows (98/ME/NT4/2K/XP)
    • MAC OS 10
    • Solaris
    • Linux
physical network topology
Physical Network Topology
  • DU Data Backbone
  • Wireless is several Internal VLANs / Subnets
ieee 802 11g
IEEE - 802.11g
  • Doubles bandwidth with same RF characteristics
  • Extends 802.11b (2.4 GHz) to 22 M bit/sec.
  • Intended to be backwards compatible w/ 802.11b
  • Approved.
  • 1st Products expected 2002
ieee 802 11a
IEEE - 802.11a
  • Uses 5 GHz Carrier Frequency
  • 6M–54M Bit /sec rates (54-100!)
  • Different Radio A.P. Design Criteria (4x rule):
    • 802.11b = ~250-300 Feet
    • 802.11a = ~90 Feet
    • Harder to get through walls, furniture, etc..
  • PC Cards will use more power – (Laptops)
  • Products available today
  • Total Cost of Ownership increases!
ieee 802 11e draft
IEEE - 802.11e - Draft
  • AKA Whitecap2 – Cirrus Logic
    • Earliest incarnation of IEEE 802.11e
  • New standard proposal will add:
    • QoS Features
    • Multimedia Support to 802.11a & 802.11b
    • Major improvements in overall “channel robustness”
802 11e cont
802.11e – Cont.
  • Mechanisms for dealing with adjacent subnets operating on the same channel
  • Baseline Approved in November 2000
    • Final Draft expected in Late 2002
    • Final Approval is after Draft
product links
Product Links
  • Agere = AP2000/1000/500
    • http://www.lucent.com/micro/
    • Avaya = AP-3 = Agere AP-2000
  • Cisco = AP350
    • http://www.cisco.com/warp/public/cc/pd/witc/ao350ap/
  • Antenna Resale
    • http://www.hyperlinktech.com/web/antennas_2400.html
other good articles links
Other Good Articles & Links
  • http://standards.ieee.org/
  • http://www.wi-fi.com/
  • http://www.wireless-integration.com
  • http://www.80211-planet.com
  • This Presentation:
    • CHECO WEBSITE – SOON!