Transcript Wireless Internet Working

Wireless Internet
Examples from the real world
John M. Brown
iHighway.net, Inc.
[email protected]
(505-346-5000
Overview
 Why Wireless
 Types of Technology
 Typical Installation
• Equipment
• Costs
 Problems / troubleshooting
Why Wireless ?
 Better total Control of the Network
 Remove telco from the picture
 Increase Direct ISP Revenues
• Install in less than 10 days, start revenue flow
 Cheaper bandwidth
Types of Technology
 Licensed and UN-licensed radios
 UN-licensed uses (No FCC permit needed)
• 900 MHz, 2400 MHz or 5560 MHz
• Spread Spectrum, either FH or DS
 Licensed is expensive and requires permits
Typical Installation
 Equipment
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Two or more radios
Antennas (depend on install requirements)
Antenna Mount (skid, pole, wall mount, etc)
COAX Cable 50 Ohm LMR400 or LMR 600
RP-TNC and N style connectors
Crimp and Soldering tools
Typical Installation
 Before you install, DO A SITE SURVEY
• Plot on a good map your LOS
• Use a hand held GPS to get coordinates
• Use a good spotting scope and find the other
end
• Look for other antennas on near by buildings
• If Avail, use a spectrum analyzer
• Do your Loss and Distance Calculations
Typical Installation
 Make sure you follow local code and ord’s
 Make sure you know the T&C’s for
communities, gated, etc.
 Adjust your AUP and or T&C’s to reflect
• not responsible for WX issues (lightning,etc)
• not responsible for interference
• MTBR for down links can vary, have spare parts
Typical Installation
 Do a “Test Install”
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first:
take a 4-6 foot pole and attach a 23dBi dish
connect to radio and search for other end
verify connectivity quality and strength
note general heading of antenna
note elevation (did you have to lift it up, etc)
now try antenna you plan to use
Typical Installation
 Most important part of install (Antenna)
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Make sure the mount is STRONG
Will NOT move in wind (antenna loads are high)
Well grounded, ground rod or similar
COAX is tied down with gentle sweeps
Lightning arresting equipment is grounded
Use a rubber mat for skids, to protect roof
Typical Installation
 Keep COAX length
SHORT
• No more than 100 feet
 Extend reach on the Ethernet Side
 Use FIBER to extend reach
• Not affected by “plant / electrical noise”
• Wonderful lightning protection
Typical Installation
 Tape and secure ALL connections
 Use 3M All Weather Tape
• NOT Electrical tape or duct tape
 Use BLACK Nylon Ties
• White ones will break down in UV
 If able, place COAX in conduit for protection
Antenna on roof top #1
Antenna on roof #2
Types of Antenna’s (Grid Dishes)
Types of Antenna’s (Panel Mount)
Installation Examples
 Normal Installs
 Strange Installs
• Side Lobe RF Shielding
Interference from other
buildings
 Major building areas are big potential for
problems
Interference requires
modifications
 Depending on the problem you can
construct shields to block interference
 The following couple of slides show one
such shield that was build in about 60 min.
Before shield was added
After shield was added
Another shot of the shield
Equipment Costs
 Radio Units typically cost (MSRP)
• 1-2 Mbps $1995
• 1-11 Mbps $2395
 Antenna’s typically cost (MSRP)
• Panel Mounts $295
• Grid Dishes $295 - $495
 Cable and hardware:
$300 to $700
Troubleshooting / Problems
 Interference from other ISM/SS devices
 Weather (Rain, Snow, WIND, T-Storms)
 DoE Labs doing something funky
 Wind
 Frequency Congestion
Troubleshooting / Problems
 When troubleshooting:
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try slower speeds
try different frequency ranges
verify connections
verify lightning arrest equipment
know your environment
– Buildings along the path (new installs by others)
Troubleshooting / Problems
 Wind was our biggest problem
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dish loads can exceed 200 LBS.
Make sure you guy wire with heavy cable
you don’t want it to move around at all
use turnbuckles on guy’s to tighten up
Troubleshooting / Problems
 Remember most products are OSI L2
• Broad/multi casts will be flooded over WAN
• Filter tools are limited and or poor
Troubleshooting / Problems
 Interference can cause:
• Packet loss because of poor queue depth
• Packet resends
• higher latency because of resends
Overall Feedback
 Customers like the wireless
• Saves them money
 We like wireless because
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Revenue stream not dependant on telco install
higher bandwidth, one time cost
better and more revenue in our pockets.
Better control over our network, end to end.
Potential markets
 Multi-tenant office buildings
• Wireless to roof, Ethernet down building riser
 Office Park’s
 Residential Communities
• Per PC costs are around $600 to 700 or less
Thank you
 I want to say Thank you
to
• Lucy, Randy and the entire U Oregon team and
Verio for a most excellent NANOG.