Transcript Linking Buildings Using Wireless

Linking Buildings Using
Wireless
Basics involved in creating data
links over 2.4 and 5GHz wireless
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Types of wireless links
•Simple single remote building direct to
a single central building: point-to-point
(PTP) links.
•Multiple remote buildings direct to a
single central building: point-tomultipoint (PTM) links.
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Types of wireless links
•PTP or PTM links using
repeaters to dog-leg around
obstructions.
•Meshing systems where a spiders
web of repeater nodes interconnect
giving multiple routes connecting
clients and sites together.
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Wireless Basics
•A wireless link will consist of one radio device at one end talking to
another
•A few basics.
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•WiFi doesn’t see through walls or
obstructions
•An Antenna doesn’t make signal
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•Do a link budget
•Set the data link speed to the
link speed you actually need
for the job
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•Too much gun!
•Keep the antenna cables
short
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Antenna Choices
Directional
•Tight beam
•Longer range
•Cone of signal beam
•Ideal for PTP or for clients in PTM
Side View
Top View
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Antenna Choices
Omni
•360 degree horizontal beam
•All round coverage
•Thin in the vertical plane
•Ideal for Point-to-Multipoint
Side View
Top View
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Antenna Choices
Sector
•Wide horizontal beam
•Well defined coverage
•Thin in the vertical plane
•Good gain
•Ideal for Point-to-Multipoint
Top View
Side View
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Outdoor Bridging Units
•In order to get the best radio signal you should
use outdoor radio devices
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Choices for
2.4GHz Bridging Units
EnGenius 2610
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Built in 10dB directional antenna
External antenna connection
PoE
Compact Design
108Meg ‘Super G’
LED signal indicators
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A Simple Example
•The best way to illustrate setting up a wireless
data link is to go over a simple example.
•The aim is a data link between two houses a
couple of Km apart.
•The preferred product is the EOC-2610
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Site Installation
•Find a Suitable Mounting point
•Attach the bridging unit
•Run LAN cable
•Similar setup for the other end
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Configuring the 2610
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A Repeating Network
WDS
•Wireless Distribution System
•Multiple access points
•Preserves the MAC addresses of client packets
•A station accepts connections from wireless clients and passes them
down the line.
•All base stations use the same radio channel and security settings.
•The repeaters will bridge and accept wireless clients at the same time.
•Throughput is halved for each repeater.
•Only works with other WDS units.
•Roaming
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A Repeating Network
Universal Repeater
•As the name suggests, should repeat from anything
•Each unit is AP + Client
•Essentially two networks; different SSID
•MAC may not be transparent.
•All base stations use the same radio channel and security settings.
•The repeaters will bridge and accept wireless clients at the same time.
•Throughput is halved for each repeater.
•No Roaming
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5GHz networking
• Frequency range 5.1 to 5.8GHz
• Better non-line-of-site operation – better scatter,
and OFDM.
• Less affected by water vapour in the air
• Higher legal power limits
• More secure and less interference
• Same functionality as 2.4GHz
• Reduced range for same power (vs 2.4GHz)
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Three Frequency Bands
•Band A - 5150-5350MHz; indoor use
•Band B - 5470-5725MHz; indoor or outdoor use
•Band C - 5725-5825MHz; outdoor fixed points (only 3 channels)
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Band B Frequency Band
•IR2006
•1W EIRP
•Fixed or Mobile Wireless Access
•License free
•DFS and TPC
•11 non-overlapping channels
•1-5Km range
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Band C Frequency Band
•IR2007
•4W EIRP, density of 23dBm/MHz
•Fixed Wireless Access
•A license is required
•DFS and TPC
•Only channels 149, 153, 157 can be used
•2-10Km range
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8610 Bridging Units
•2 different models:
NOC-8610PLUS with 16dB directional
NOC-8610EXT with antenna connector
•IR2007 Band C, licensed
•PoE
•Compact Design
•Multiple Operating Modes
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Configuring the 8610
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11n WiFi
• MIMO M(tx) x N(rx) antenna
• Spatial Multiplexing – Multiple
Spatial Streams multiplexed onto
single channel split over multiple
antenna
• Space-Time Block Coding – same
stream over several antenna
• Transmit Beamforming – signal
steering by altering the phase
• 40MHz channels
• Improved Coding Schemes
– Reduced Guide Interval
– Block Ack
– Frame Aggregation
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The MIMO-24JNR-8DB
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Dual Polarization 8dBi antenna
Alignment Tools
Passive PoE (24V)
11n Draft 2.0
PHY rates up to 300Mbps
– True TCP 83Mbps
• 7 Operating Modes
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Access Point
Client
Wireless Routing Client
Gateway
Wireless Adapter Mode
Transparent Client
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MESH Networks
•Repeating, radio nodes
•Intelligent routing protocols
•High degree of redundancy and dynamic
routing
•Routes between nodes only as
desired by originating nodes
•Loop-free, self-starting
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Advanced Routing
•Best route used
•Self healing
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Typical Applications
Anywhere where you have problems with
line of site or require a particularly high
resilience for clients e.g.
•Caravan sites
•Villages or communities
•Holiday parks
•Marinas
•etc...
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Mesh Nodes
• Single Radio
• Dual Radio
o Different Client/Backhaul
o Client 2.4GHz
o 5Ghz Backhaul
• Layer 2 vs 3
o No IP address
o MAC address of WLAN
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Supports all layer 3 protocols e.g. IP, DHCP, IPv6, IPX, etc
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8670 Meshing Unit
•Dual Radio
•Layer 2 Mesh
•Self Configuration and Healing
•Band C/IR2007
•Multiple SSID
•VLAN Pass through
•VPN Pass through
•PoE
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Time for Coffee
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