Copyright AvaLAN Wireless 2008 Installing AvaLAN Wireless Ethernet Systems Presented by Michael...

Copyright AvaLAN Wireless 2008

Installing AvaLAN Wireless Ethernet Systems

Presented by Michael Derby

AvaLAN Wireless Systems


AvaLAN Wireless Ethernet Radio Systems

The most common questions…

Do I need backhaul or a multiple access solution?How far will the link go? How does the data rate change with distance?How is security handled?How does the system handle interference?

How to setup and debug an installation?Which antenna to use? How to mount the system on a pole?Can the system provide multiple access?How to install multiple systems in close proximity?


What is the difference between backhaul and multiple access?

Backhaul solutions are optimized for fixed point to point connections.

Multiple Access solutions are optimized to support many simultaneous mobile users at short range.

Typically - Multiple Access systems are a poor choice for backhaul.


“Backhaul” systems with directional antennae

30 miles14 miles

17 m

iles

Location #1

Location #2

Location #3

Main Location

Point to Point radios – each subscriber gets a

dedicated 1.54Mbps radio link (4.6Mbps total)


“Backhaul” systems with directional antennae

5 miles4 miles

7 m

iles

Location #1

Location #2

Location #3

Main Location

OmniAntenna

Multipoint radios – xTR 1.54Mbps is shared between

subscriber radios


“Mobile” systems with Omni antennae

0.25 miles0.25 miles

0.25

mile

s

Location #1

Location #2

Location #3

Main Location

OmniAntenna


subscriber radios


“Sector antennae”

10 miles

7 m

iles

Location #4

Location #3

Main Location

12 miles

Location #2

8 miles

Location #1

“Directional antennae”


subscriber radios


How far will the link go?


Clear Line-of-sight (LOS)

5.8GHz

40 Miles is possible

Drive a bus through the path…


How far will it go?

Radio Link Budget – Free Space Loss = System operating margin

System operating margin >18dB is safe

Free space loss = 20log(Freq in MHz) + 20log(distance in miles) +36.6

At 900MHz: At 5800MHz:0.1 mile has 76dB of loss 92dB of loss1 mile has 96dB of loss 112dB of loss10 miles has 116dB of loss 132dB of loss50 miles has 130dB of loss 146dB of loss


Link BudgetsAt 900Mhz with 15dBi with 11dBi with 2.5dBi+ transmitter power 21dB 21dB 21dB+ transmitter antenna gain 15dB 11dBi 2.5dBi– transmitter cable losses 0dB 0dB 0dB+ receiver sensitivity 97dB 97dB 97dB+ receiver antenna gain 15dB 11dBi 2.5dBi– receiver cable losses 0dB 0dB 0dB____________________ _____ _____ _____

Link Budget = 148dB 140dB 123dB

At 5800Mhz with 29dBi with 23dBi with 5dBi+ transmitter power 21dB 21dB 21dB+ transmitter antenna gain 29dB 23dBi 5dBi– transmitter cable losses 1dB 1dB 0dB+ receiver sensitivity 97dB 97dB 97dB+ receiver antenna gain 29dB 23dBi 5dBi– receiver cable losses 1dB 1dB 0dB____________________ _____ _____ _____

Link Budget = 174dB 162dB 128dB


Examples:Will a 5.8Ghz AvaLAN link work at 40 miles using 23dBi panels on both ends?

Yes: Link budget (162dB) – Free space loss (144dB) = System operating margin (18dB)

Will a 900Mhz AvaLAN link work at 50 miles using a 15dBi yagis on both ends?


Will a 5.8Ghz AvaLAN link work at 5 miles using a 5dBi omni and a 23dBi?


Will a 5.8Ghz AvaLAN link work at 3/4 mile using 5dBi omnis on both ends?



Diffractive Non-line-of-sight

900Mhz

2.4GHz5.8GHz

20ft 20ft10 Degrees

500 ft

Angle of Attack

10 Degrees

2 Miles

Angle of attack Distance1° 10 Miles5° 5 Miles10° 2 Miles15° 1 Mile


Penetrating Non Line of Sight

Up to 1500ft


Path loss calculations - Indoor


Path loss calculations - Indoor

Indoor Range [ft]

Ac

tua

l T

hro

ug

hp

ut

[Mb

it/s

]

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

50 100 150 200 250 300 400 500 600 800

802.11a/g

Wal

l

Wal

l

802.11

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

1000

With 2.5dBiOmniAntennas

With9dBiDirectionalAntennas

Wall Attenuation: 7dB/wall at 2.4Ghz 4dB/wall at 900Mhz

Wal

l

1500


802.11a/gProvides the highest data

rate links at short range for multiple access networking

Longest-Range wireless Ethernet solution!

Wal

l

802.11b

Indoor Range [ft]

Ac

tua

l T

hro

ug

hp

ut

[Mb

it/s

]

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

50 100 150 200 250 300 400 500 600 800

802.11a/g

Wal

l

Wal

l

802.11

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

Wal

l

1000

With 2.5dBiOmniAntennas


Wall Attenuation: 7dB/wall at 2.4Ghz 4dB/wall at 900Mhz

Wal

l

1500


802.11a/gProvides the highest data

rate links at short range for multiple access networking

Longest-Range wireless Ethernet solution!

Wal

l

802.11b

See our online path loss white paper at:www.avalanwireless.com/support

http://www.avalanwireless.com/support


How does the data rate change with distance?

The data rate should only be affected by the added speed of travel delay.

A 50 mile link will have a 3% data reduction due to speed of travel impact on packet timing.


How is security handled?

AvaLAN uses AES128 conformant to FIPS 197 and with NIST certificate.

Encryption at the application layer is becoming a preferred technique for securing sensitive communications. (VLAN/VPN/SSL/TSL)


Robust against interference?How does the system handle interference?

In band – packet bursting and agilityout of band – SAW bandpass filter

How easy is the system to intentionally jam?Not possible with consumer products.

The AvaLAN system able to autonomously coexist with many other devices in the 902-928MHz band. However, all radios can be jammed...


AvaLAN Products

NEW : Web browser interface

Best : 900Mhz and 5.8Ghz Simple setupMulti-Point Outdoor Version AES128 EncryptionxTR & iTR Sold Individually Spectrum Analyzer

Data or Video Aluminum NEMA 4x EnclosureOutdoor and Indoor Versions Remote Diagnostics,

Configuration and upgradeable


Multi-Point Network Topologies


How to setup a system?

Point to Point systems are shipped ready to run.

Multi-Point systems require 2 steps to create the network.Step 1 – choose the unit to be the access point and set DIP 1 ON

Step 2 – attach each subscriber to the access point via Ethernet port to share keys

Auto frequency selection…

No crossover cables needed…

Check the link quality…

Check the ETH link LED…

Ping something on the other side…


How to setup multiple systems in close proximity?

Use high gain antennae to isolate and direct energy…

For Pt to Pt, Keep the units paired together…

Setup one link at a time with the others off…

Adjust antennae to create sufficient isolation between links use angular, polarization, spectral and spatial separation…


Isolation techniques

Del

ta

Angular

Horizontal Polarization

Vertical Polarization


Power supply options?AvaLAN offers two power supply accessories.

Indoor AW12V - cigarette lighter powered automotive applications.Outdoor AW24V - 24VAC power common in security markets

The indoor radios are compatible with 48VDC to 5VDC Linksys POE splitter (model WAPPOE $35)

The indoor radios can be powered from 5VDC to 7VDC

The outdoor radios can be POE powered from 6VDC to 48VDC.

For solar applications it is possible to power with as little as 3.2VDC at 350mA = 1 Watt of power draw.


How to provide lightning protection?

AvaLAN’s antennae are DC grounded. However, the use of inline lightning suppressor is always a good idea.


Thank you!www.AvaLANwireless.com

Sales - [email protected] (866)533-6216 Support - [email protected] (650)384-0000

Michael Derby - [email protected]

Copyright AvaLAN Wireless 2008 Installing AvaLAN Wireless Ethernet Systems Presented by Michael...

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