copyright avalan wireless 2011 installing avalan wireless ethernet systems presented by michael...

Copyright AvaLAN Wireless 2011

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, multiple access or mesh 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?Can the system provide multiple access?How to install multiple systems in close proximity?What to do about lightning?


What is the difference between backhaul, multiple access and mesh?

Backhaul solutions are optimized for fixed point to point connections. Simple to install and maintain.

Multiple Access solutions (Wi-Fi) are optimized to support many simultaneous transient users at short range. Great for cafes, homes, airports.

Mesh systems require high node density. They are complex systems and are expensive to buy, install and maintain. Great choice if you have a big budget.


“Backhaul” systems with directional antennae

17 m

iles

Location #1

Location #2

Location #3

Main Location

Point to Point radios – each subscriber gets a dedicated radio link for maximum throughput.


“Backhaul” systems with directional antennae

4 m

iles

Location #1

Location #2

Location #3

Main Location

OmniAntenna

Multipoint radios – data rate is shared between subscriber

radios


“Sector antennae”

17 m

iles

Location #4

Location #3

Main Location

Location #2

Location #1

“Directional antennae”

Multipoint radios – data rate is shared between subscriber

radios in sector


“Portable or Mesh” systems with Omni antennae

250f

tMain Location

OmniAntenna

Multipoint/mesh radios – Data is shared and repeated

between subscriber radios

1,00

0ft

1,000ft


Mesh and Spoke


How far will the link go?


How far will the radio go?

Radio Link Budget – Free Space Loss = System operating margin

System operating margin >18dB is safe


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

Link Budget = 148dB 123dB

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

Link Budget = 162dB 128dB


Free Space loss

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

Distance 900MHz: 5800MHz:

0.1 mile has 76dB of loss 92dB of loss

1 mile has 96dB of loss 112dB of loss

10 miles has 116dB of loss 132dB of loss

50 miles has 130dB of loss 146dB of loss


Line of Sight 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 panel?


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° 1 Miles


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


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?

AES keyed encryption – FIPS 197/140-2

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 and out of band?

How easy is the system to intentionally jam?

Is the system able to autonomously coexist or is a truck roll required to perform a site survey and change channel ?


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 network and crypto keys

Step 2 – join each subscriber to the access point via same 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 mobile applications.Outdoor AW24V - 24VAC power common in security markets

The radios can be POE powered from 12VDC to 48VDC.

For solar applications it is possible to power the radio in continuous transmit with 12VDC at 120mA = 1.5 Watts 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.

Mount the antenna at least 3ft from the top of a grounded pole


Thank you!www.AvaLANwireless.com

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

Michael Derby - [email protected]

copyright avalan wireless 2011 installing avalan wireless ethernet systems presented by michael...

Documents

copyright avalan wireless

main location location

miles location

loss slide

ft slide

main location point

sector slide

db receiver antenna