Internet on the Edge Andrew Mundy Engineering Laboratory Systems - - PowerPoint PPT Presentation

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Internet on the Edge Andrew Mundy Engineering Laboratory Systems - - PowerPoint PPT Presentation

Jun 18, 2023 204 likes •558 views

Internet on the Edge Andrew Mundy Engineering Laboratory Systems Administration (ELSA) Engineering Laboratory, National Institute of Standards and Technology (NIST) You are here Your customer is over there (no, not the deer) Distance between

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SLIDE 1

Internet on the Edge

Andrew Mundy Engineering Laboratory Systems Administration (ELSA) Engineering Laboratory, National Institute of Standards and Technology (NIST)

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SLIDE 2

You are here

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SLIDE 3

Your customer is over there

(no, not the deer)

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SLIDE 4

Distance between here and there

775 Meters 775 Meters

X

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SLIDE 5

2,545 Feet 2,545 Feet

(for those who don (for those who don’ ’t speak in SI) t speak in SI)

Distance between here and there

X

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SLIDE 6

Can this be done?

  • Power
  • Network
  • Environment
  • Schedule
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SLIDE 7
  • Network connection for the

Defense Advanced Research Projects Agency (DARPA) robotics trials

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SLIDE 8

Them

  • We need Internet

access in Building 202.

  • It has to be a Visitor

Network connection.

  • But we also need a

wired Visitor Network for some hardware.

  • Wired connection. How

hard is that?…

  • ………….
  • Wireless Visitor Network.
  • Workgroup Bridge to

convert the wireless Visitor Network to a wired connection.

Us

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SLIDE 9

Them

  • Can we get wireless

across the street?

  • How about down the

street, across the pond, behind the trees?

  • Access point with an

external directional antenna.

  • We’ve never done that

before……..

Us

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SLIDE 10

Plan A

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SLIDE 11
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SLIDE 12
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SLIDE 13

Initial Testing

  • Cisco 1240AG access point and external

directional antenna

  • Less than acceptable results (80 Kbps)
  • Needed more power and increased

directionality

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SLIDE 14

View from the roof

Aironet 1300 w/ integrated antenna

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SLIDE 15

View from the roof

AIR-ANT1949 Yagi antenna

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SLIDE 16

View from the roof

AIR-ANT3338 Parabolic antenna

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SLIDE 17
  • (2) Cisco Aironet 1300 series outdoor

access point/bridge devices

  • (2) AIR-ANT 3338 parabolic dish antennas.

Purchased

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SLIDE 18

Configuration

  • Rooftop

– 1300 series in LWAPP Access Point role – WPA2-PSK with AES encryption – Connected to AIR-ANT 3338 dish antenna.

  • DARPA trailer

– 24 foot enclosed trailer with roof rack – 1300 series in autonomous Workgroup Bridge role – Connected to AIR-ANT 3338 dish antenna – Power

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SLIDE 19

Configuration

  • LR-2 power injector mounted indoors
  • Converted Ethernet and power to dual

coaxial RG-6 cables.

  • Purchased additional 60 meters of RG-6

cable (maximum of 200 meters)

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SLIDE 20

Safety First!

  • Electrical grounding
  • Roof access
  • Tools
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SLIDE 21

Ready to go

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SLIDE 22

What now?

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SLIDE 23

What now?

  • Home improvement store shopping list:
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SLIDE 24

What now?

  • A little cutting here and reinforcing there…
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SLIDE 25
  • Don’t forget to

add sandbags

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SLIDE 26

View from the roof

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SLIDE 27

View from the roof

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SLIDE 28

View from the roof

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SLIDE 29

View from the roof

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SLIDE 30

Testing Site

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SLIDE 31

Keeping it Legal

  • Power output regulated by FCC
  • Effective Isotropic Radiated Power (EIRP)
  • Not to exceed 30 dBm
  • EIRP = AP power (dBm) + antenna gain

(dBi) – cable loss (dB)

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SLIDE 32

Lessons Learned

  • You need a lot more sandbags than you

think you do.

  • Temporary solutions aren’t always

temporary.

  • Be flexible (“Semper Gumby”).
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SLIDE 33

Questions