1.4 File Format ..................................................................................................................................................... 9
3.0 Features .......................................................................................................................................................... 11
4.1 Serial ............................................................................................................................................................ 12
4.3 Serial + Ethernet........................................................................................................................................... 12
4.4 Enterprise Class ........................................................................................................................................... 13
4.5 Industrial Class ............................................................................................................................................. 13
4.6 Heavy Duty Class ......................................................................................................................................... 14
6.0 Pin out and Connectors .................................................................................................................................... 18
6.1 Serial Ports ................................................................................................................................................... 18
6.2 Ethernet Port ................................................................................................................................................ 19
11.0 Getting Started ................................................................................................................................................. 34
11.1 Unpack the AirborneDirect™ Device ............................................................................................................ 34
11.2 Connect AirborneDirect™ to host ................................................................................................................. 34
11.3 Attach Antenna and Power-up the AirborneDirect™ ..................................................................................... 34
12.0 Configuring Device – Industrial Serial (ABDG-SE-IN5XXX) .............................................................................. 35
13.0 Configuring Device – Enterprise Serial (ABDG-SE-DP5XX) ............................................................................. 38
13.1 Connect a Host Computer ............................................................................................................................ 38
13.2 Interacting with the AirborneDirect™ device ................................................................................................. 38
13.3 Determine and Store the Access Point SSID ................................................................................................ 39
13.4 Determine the Device’s IP address ............................................................................................................... 39
13.5 Accessing the Device Using the Web Interface ............................................................................................. 40
13.6 Accessing the Device Using Telnet .............................................................................................................. 40
15.0 Using the Web Interface ................................................................................................................................... 44
15.1 Navigation Bar .............................................................................................................................................. 45
15.3 Navigating the Website ................................................................................................................................. 46
15.4 Updating a Field ........................................................................................................................................... 47
19.1 Configuring DHCP on WLAN Interface ......................................................................................................... 63
19.2 Configuring DHCP on Ethernet Interface ...................................................................................................... 64
19.3 Configuring a Static IP Address on WLAN Interface ..................................................................................... 65
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19.4 Configuring a Static IP Address on Ethernet Interface .................................................................................. 66
20.0 Configuring Serial Device Server ..................................................................................................................... 68
20.1 Configuring Serial Port for Access on Telnet Port ......................................................................................... 68
20.2 Configuring Serial Port 1 for Access on Tunnel Port ..................................................................................... 69
20.3 Configuring Serial Port 2 for Access on Tunnel Port ..................................................................................... 71
20.4 Configuring Serial Port 1 as TCP Client ................................ ........................................................................ 72
20.5 Configuring Serial Port 2 as TCP Client ................................ ........................................................................ 73
21.0 Installing and Using the Airborne VirtualCOM Driver ........................................................................................ 75
22.0 Replacing a Serial Cable .................................................................................................................................. 78
24.0 Web Page Overview ........................................................................................................................................ 87
Module Status ........................................................................................................................................................ 88
Ethernet Status ...................................................................................................................................................... 89
Radio Statistics ...................................................................................................................................................... 91
Serial Port Settings .............................................................................................................................................. 100
Serial Port 2 Settings ........................................................................................................................................... 101
List Configuration File .......................................................................................................................................... 111
Active Configuration ............................................................................................................................................. 113
User Configuration ............................................................................................................................................... 114
List Certificates .................................................................................................................................................... 118
Blink the POST LED ............................................................................................................................................. 128
Stop Blinking the POST LED ................................................................................................................................ 129
25.5 Regulatory Test Mode Support ................................................................................................................... 133
Figure 7 - Ethernet Jack Pin Out ...................................................................................................................................... 19
Figure 21 - Airborne Ethernet Bridge IP Configuration ..................................................................................................... 83
Tables
Table 1 – Serial Port Pin Definition .................................................................................................................................. 18
Table 2 - Serial Ports by Product Class ............................................................................................................................ 19
Table 3 - Ethernet Connector Pin Out .............................................................................................................................. 19
Table 10 - Supported Data Rates by Band ....................................................................................................................... 25
Table 12 - Radio Typical Performance Range .................................................................................................................. 26
Table 14 - SE-IN5XXX Accessing the Web Interface ....................................................................................................... 35
Table 34 – Configure Data Tunnel on Telnet Port ............................................................................................................ 68
Table 35 - Data Tunnel using Telnet Port ......................................................................................................................... 69
Table 36 – Configure Data Tunnel on Serial Port 1 Tunnel Port (TCP) ............................................................................. 70
Table 37 - Data Tunnel using Tunnel Port on Serial Port 1............................................................................................... 70
Table 38 – Configure Data Tunnel on Serial Port 2 Tunnel Port (TCP) ............................................................................. 71
Table 39 - Data Tunnel using Tunnel Port on Serial Port 2............................................................................................... 72
Table 40 - Configure Serial Port 1 as TCP Client ............................................................................................................. 72
Table 41 - Configure Serial Port 2 as TCP Client ............................................................................................................. 73
The area next to the indicator will identify the specific information and make any
references necessary.
The area next to the indicator will identify the specific information and make any
references necessary.
1.0 Conventions
The following section outlines the conventions used within the document, where
convention is deviated from the deviation takes precedence and should be followed. If
you have any question related to the conventions used or clarification of indicated
deviation please contact Quatech Sales or Wireless Support.
1.1 Terminology
Airborne Enterprise Device Server and AirborneDirect Enterprise Device
Server is used in the opening section to describe the devices detailed in this
document, after this section the term module will be used to describe the
devices.
1.2 Notes
A note contains information that requires special attention. The following
convention will be used. The area next to the indicator will identify the specific
information and make any references necessary.
1.3 Caution
A caution contains information that, if not followed, may cause damage to the
product or injury to the user. The shaded area next to the indicator will identify
the specific information and make any references necessary.
1.4 File Format
These documents are provided as Portable Document Format (PDF) files. To
read them, you need Adobe Acrobat Reader 4.0.5 or higher. For your
convenience, Adobe Acrobat Reader is provided on the Radio Evaluation Kit CD.
Should you not have the CD, for the latest version of Adobe Acrobat Reader, go
to the Adobe Web site (www.adobe.com).
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2.0 Product Description
This guide describes the AirborneDirect™ device servers and wireless adapters from
Quatech, Inc. AirborneDirect™ is a fully integrated, 802.11 wireless Local Area Network
(LAN) connectivity device designed to provide wireless LAN and Internet connectivity in
industrial, scientific, medical, and transportation applications where an existing
communications interface already exists. The AirborneDirect family of products supports
Serial (RS232/422/485), Ethernet and a combination these interfaces in a range of
packaging options.
The AirborneDirect™ product family provides true plug-and-play wireless connectivity. By
delivering convenient, easy-to-deploy wireless network connectivity, the device servers
and adapters significantly reduce the complexities of wireless system deployment and
network implementation. At the same time, users can move equipment without the cost
and time associated with wired network drops and environment restrictions. This provides
flexibility for seasonal demands, line and staffing changes, and more.
The AirborneDirect™ Serial Bridges and device servers provide a simple connection
between the 802.11 wireless LAN and three leading serial interfaces: RS-232, RS-422,
and RS-485. The Bridge acts transparently between any device using these interfaces
and a wireless LAN. Using the Quatech virtual communications port Windows device
driver OEMs can communicate with their devices from any workstation on the same
network as if the workstation and devices were directly attached through a serial port.
The AirborneDirect™ Ethernet Adapter provides a link between the 802.11 wireless LAN
and any Ethernet-ready device with an RJ-45 connector. It acts transparently between
the device and a wireless LAN. By integrating AirborneDirect™ into existing and legacy
platforms, OEMs can significantly enhance their products by delivering increased value
and functionality to their entire customer base.
The Airborne family includes the ability to simultaneously use the serial-to-wireless and
Ethernet-to-wireless connectivity in the same unit. This capability provides for multiple
connections to the same machine or consolidation of multiple wireless units into a single
device.
The AirborneDirect™ products open the world of remote device monitoring and
management, as well as wide-area data collection, to any device, machine, or plant that
has an external serial or Ethernet connection and a network infrastructure. The
development kit provides quick and easy access to the Bridge’s configuration and
functions, while providing OEMs with a platform to develop their branded solutions. The
Bridge also provides the capability to perform firmware upgrades that allow new features
to be added quickly and easily, protecting your investment.
The Enterprise family includes the most advanced security support available for the
device class in the industry, including WPA, WPA2 and full Enterprise support. The
devices can be used with the most advanced WLAN networks being deployed today. The
Airborne products are based upon the industry leading Airborne device server and
wireless adapter technology from Quatech, providing a fully compatible and familiar
device interface across the all product ranges. If you’ve used one you have used them
all.
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3.0 Features
802.11b/g WiFi Radio with 32bit ARM9 CPU (128Mb SDRAM, 64Mb Flash)
Integrated Airborne Device Server and Wireless Adapter technology.
Supports WEP, WPA, WPA2 and 802.1x Supplicant, with Certificates.
The wireless device server includes integrated:
802.11b/g radio driver
TCP/IP stack, UDP, telnet, FTP server
Data bridging and buffering
Command Line Interface
Web interface
WPA Supplicant
802.11 Radio Driver
DHCP Server (Ethernet Interface)
Firewall and Port Forwarding (Ethernet)
FTP Server
Supports flexible antenna selection.
Operating Temperature (-40°C to 85°C)
Storage temp (-50°C to 125°C)
Industry standard wired connections:
D-9 Serial connectors (RS232/422/485)
RJ-45 (10/100 Ethernet)
Multiple host interfaces supported:
Single and Dual Serial (RS232/422/485) – up to 921K BAUD
10/100 Ethernet
Integrated standard and wide range (J1455) Power Supply (5-36VDC)
Power connector options include 2.1mm Barrel Jack, Terminal Block and
custom connectors.
Integrated Site Survey mode.
Advanced Low power modes.
Rugged mounting options.
Virtual COM port driver (WinXP, Vista, Win7)
Worldwide Regulatory Support (FCC, IC, CE)
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4.0 Device Types
This manual covers all variations available in the AirborneDirect™ device family. The
following section identifies the different types both functional and classification. In most
cases the functional types are available in the listed classifications. If you are not certain
which type you have or would like clarify the available options please contact Quatech
Sales or Technical support.
4.1 Serial
This device supports a single or dual serial port and provides serial to 802.11
bridging. The serial devices can support one or more of the following serial
interface types:
RS232
RS422
RS485
Default configuration on all models is RS232, conversion to RS422/485 requires
software configuration and in some models jumper setting changes. These are
covered in the following sections.
This device allows the connection of a serial port to an 802.11 network.
4.2 Ethernet
The Ethernet adapter provides a wireless interface to an existing Ethernet port
(RJ-45). Depending upon the model of device the connection to the Ethernet port
of the host is made via a RJ-45 socket or pigtail with a RJ-45 plug.
The device supports a 10/100 Ethernet interface with auto configuration. Manual
control of the interface is possible through the web or CLI interface.
4.3 Serial + Ethernet
This device allows for simultaneous connection of Serial and Ethernet ports.
Providing the same functionality on each port that is available on the individual
devices, it is possible to maintain network based connections to both the
Ethernet and Serial ports without compromise of functionality or performance.
Each interface can be configured and operated independently of the others.
Connection to the serial port can be made via both the wireless and Ethernet
ports supporting redundant network connectivity for high reliability applications.
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4.4 Enterprise Class
The enterprise class product provides the best cost vs. performance in the
AirborneDirect™ product family. The packaging is compact and designed to fit
with non-industrial applications and markets. The product class supports the full
industrial operating temperature range and the complete set of functional
capabilities of the Airborne™ Device Server and Wireless Adapter technology.
Figure 1 - Enterprise AirborneDirect™ Device
The Enterprise class product range includes devices that support a single serial
port and an Ethernet device.
The enterprise class product is ideal for the following application types:
Medical equipment.
Point-of-Sale devices.
CNC/DNC equipment.
Time clocks.
Scales.
Data collection devices.
Vehicle diagnostics.
The Enterprise Class products require a 5VDC power supply.
4.5 Industrial Class
Developed to support the demands of the industrial and automotive
environments, the features of the Industrial Class products offer a more flexible
and rugged alternative to the enterprise class devices. The product class
supports the full industrial operating temperature range and the complete set of
functional capabilities of the Airborne Device Server and Wireless Adapter
technology.
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Figure 2 - Industrial AirborneDirect™ Device
The family includes a metal enclosure and a wide range power supply capable of
exceeding the SAE J1455 power supply requirements.
The enterprise class product is ideal for the following application types:
The Industrial class of products includes Ethernet only, Serial only and the dual
(Serial+Ethernet) capability.
4.6 Heavy Duty Class
These are the highest performing and most rugged Serial Device Server and
Ethernet adapter products in the market. The Heavy Duty product class supports
the highest level of ruggedization available allowing use in the most hazardous
and demanding environments. The product class supports the full industrial
operating temperature range and the complete set of functional capabilities of the
Airborne Device Server and Wireless Adapter technology.
Figure 3 - Heavy Duty AirborneDirect™ Device
The product family uses the Deutsch EEC-325X4B enclosure with sealed and
vented variations and a wide range power supply, capable of exceeding the SAE
J1455 power supply requirements.
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The Heavy Duty products are ideal for the following applications:
Mining equipment telematics.
Military vehicle diagnostics.
Avionics.
Construction heavy equipment diagnostics.
The HD class of products includes Ethernet only, Serial only and the dual
(Serial+Ethernet) capability, through a custom Deutsch connector (DTM06128A).
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5.0 Block Diagram
The following outlines the block diagram for the devices:
Figure 4 - ABDG-SE/ET-DP5XX Block Diagram
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Figure 5 - ABDG-ET/SE-IN5XXX Block Diagram
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Pin
RS232 (DTE)
RS232 w/
Power on pin 9
2
RS422
RS485
1
No Connect
No Connect
No Connect
No Connect
2
RxD
RxD
RxD+
Connect to pin 33
3
TxD
TxD
TxD+
TxD+/RxD+
4
No Connect
No Connect
No Connect
No Connect
5
GND
GND
GND
GND
6
No Connect
No Connect
RxD-
Connect to pin 93
7
RTS
RTS
No Connect
No Connect
8
CTS
CTS
No Connect
No Connect
9
No Connect
5VDC (Input)
TxD-
TxD-/RxD-
1. For 2-wire operation, the user must externally connect pin 3 to pin 2 and
pin 6 to pin 9.
2. Power on pin 9 only available on Enterprise devices (ABDG-SE-DP501).
3. Only required on Industrial products (ABDG-SE-IN54XX)
6.0 Pin out and Connectors
Pin definition is dependent upon the device type selected. The following defines the pin
outs for the individual interfaces.
6.1 Serial Ports
The AirborneDirect™ units support either a single or dual serial port
configuration. The Port pin out can change depending upon the interface
configuration chosen, Table 1 shows the pin out for the interface selected.
Figure 6 - DE-9 (DB-9) Connector Pin-out
Table 1 – Serial Port Pin Definition
Table 2 shows the availability of the serial ports and available interface types by
product class.
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Device Class
Port 1
Port 2
Enterprise
RS232
RS422 (4-wire)
RS485 (2-wire)
N/A
Industrial
RS232
RS422 (4-wire)
RS485(2-wire)
N/A
RS232
RS422 (4-wire)
RS485(2-wire)
RS232
RS422 (4-wire)
Pin
RJ45 Socket (Industrial)
RJ45 Plug (Enterprise)
1
TxD+
RxD+
2
TxD-
RxD-
3
RxD+
TxD+ 4 NC
NC 5 NC
NC 6 RxD-
TxD- 7 NC
NC
Table 2 - Serial Ports by Product Class
The Port 1 and Port 2 interfaces support the following configurations:
Flow Control: None, Hardware (CTS/RTS), Software (XON/XOFF)
Port 1 Default settings: 9600, 8, N, 1, No Flow Control.
Port 2 Default settings: 9600, 8, N, 1, No Flow Control.
6.2 Ethernet Port
The AirborneDirect™ Ethernet devices support a single interface. This is a
10/100Mbps interface that supports auto negotiation and cross-over cabling. The
interface also supports both half and full duplex for 10Mbps and 100Mbps. Table
XX shows the interface pin out.
Figure 7 - Ethernet Jack Pin Out
Table 3 - Ethernet Connector Pin Out
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Pin
RJ45 Socket (Industrial)
RJ45 Plug (Enterprise)
8
NC
NC
Green LED
Valid TCP/IP connection made with
Airborne Adapter:
Off No TCP/IP connection
On Valid TCP/IP Connection
N/A
Yellow LED
Power-on Self Test (POST):
Off Not powered or has failed POST
On Passed POST
N/A
Type
Description
Product Class
Serial
DE-9 Connector Male
Enterprise, Industrial
Ethernet
RJ45 Plug
Enterprise
Ethernet
RJ45 Socket
Industrial
Antenna
RP-SMA
Enterprise, Industrial
Power
2.1mm Barrel Jack
Enterprise, Industrial
Power
2 Position Terminal Block
Industrial
6.3 Connector Definition
There are a total of five connectors used by the AirborneDirect™ family. Which
connectors are available on your product depend upon the model you purchased.
The definition for the connectors is common to all product classes. Table 4
provides definitions for the connectors.
Table 4 - Connector Description
6.4 OEM Reset Switch (Factory Reset)
All AirborneDirect™ devices support the ability to reset the configuration back to
OEM defaults. This is useful when a device has been incorrectly configured and
has lost the ability to communicate on any of the available ports, preventing
access to one of the configuration interfaces and blocking your ability to recover
the device by correcting the configuration.
The following Table 5 describes the sequence for OEM resetting the
AirborneDirect™ devices. All devices use the same process however the
loo0cation of the OEM reset switch varies between the product families.
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1
Disconnect or turn off the power supply.
2
Press the OEM reset (factory reset) button.
This may require the use of a small narrow object, it is important that this object is
not sharp as it may cause damage to the unit.
3
While holding the OEM button pressed reapply power to the unit.
4
Hold the OEM reset button for 5-6 seconds after power has been applied.
5
Release the OEM reset button.
6
The device will restart with the installed OEM defaults. If no OEM Configuration is
applied the device will return to Quatech factory defaults.
See section 15.6 on use of OEM factory configurations.
RS-485 w/
Termination
RS-232 Power Pin 9,
Cable Sense
1
1
RS-232
Cable Sense
1
RS-422 w/
Termination
1
Table 5 - OEM Reset Procedure
The location of the OEM reset button for the Enterprise devices is on the back of
the enclosure, underneath the label near the pigtail. The Industrial devices OEM
reset button is on the Ethernet/Power end of the box next to the 2.1mm barrel
connector (See section 10.0)
6.5 Enterprise Serial Interface Jumpers
The Enterprise Serial device server supports RS232/422/485 interface drivers, as
well as power over pin 9. Selection of these options is made through both the
web interface and hardware jumpers. Figure 8shows the interface selection
jumpers for the different interface types.
Figure 8- Interface Selection Jumpers
The jumper selections must be made while the device is unpowered and before
being used in the final application.
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The interface type selected by the interface jumpers in Figure 8 must match the
selected configuration for the Configuration | Serial Port Settings | Serial
Interface Type setting in the web interface.
LED
Color
Airborne Device State
POWER
Adapter is not powered.
Adapter failed Power On Self Test (POST) and is not
configured for wireless communication.
Adapter passed POST but is not configured for wireless
network communication.
Adapter passed post and is configured for wireless
communication.
LINK
Adapter is not powered.
(Periodic Blinking) Adapter is searching for a valid network
(Access Point) that matches device’s configuration.
Adapter has successfully associated with an Access Point.
COMM
If Power LED is also Off then Adapter is not powered.
If Power LED is On then either:
A physical connection detected on Serial/Ethernet
cable.
No TCP session from wireless interface has been
established.
No physical Serial/Ethernet connection has been detected.
(Blinking – OFF/Red) A physical Serial/Ethernet connection
has been detected and there is traffic across the interface. No
TCP connection to the adapter has been established on the
wireless interface.
A TCP connection to the adapter from the wireless interface
has been established but no physical connection on the
Serial/Ethernet interface has been detected.
(Blinking – Green/Orange) A physical Serial/Ethernet
connection has been detected and there is Serial/Ethernet
traffic across the interface. A TCP connection to the adapter
has been established (On WLAN or Ethernet interface).
A physical Serial/Ethernet connection has been detected. A
TCP connection to the adapter has been established from the
WLAN or Ethernet interface but no traffic has been detected.
6.6 Indicator LED’s
The devices provide indicator LED’s to provide feedback on the state of the
device. These are a useful tool during installation and troubleshooting.
Table 6 - Enterprise LED Indicators
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LED
Color
Airborne Device State
POWER
Adapter is not powered.
Adapter is powered.
POST
Adapter is not powered.
Adapter failed Power On Self Test (POST) and is not
configured for wireless communication.
Adapter passed POST but is not configured for wireless
network communication.
Adapter passed post and is configured for wireless
communication.
LINK
Adapter is not powered.
(Periodic Blinking) Adapter is searching for a valid network
(Access Point) that matches device’s configuration.
Adapter has successfully associated with an Access Point.
COMM
If Power LED is also Off then Adapter is not powered.
If Power LED is On then:
No TCP session from WLAN or Ethernet interface has
been established.
A TCP connection to the adapter has been established from
the Wireless or Ethernet interfaces but no traffic has been
detected.
Table 7 - Industrial LED Indicators
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Parameter
Min
Max
Unit
Maximum Supply Voltage - Enterprise
4.5
5.5
VDC
Maximum Supply Voltage - Industrial
5.0
36
VDC
Power Dissipation
3.00
W
Operating Temperature Range
-40
85 oC
Storage Temperature
-50
125 oC
Symbol
Parameter
Rate (Mb/s)
Min
Average
dBm / mW
Peak
dBm / mW
Units
P
OUTB
Transmit Power
Output 802.11b
11, 5.5, 2, 1
13.0
15.0
31.6
dBm
P
OUTG
Transmit Power
Output 802.11g
6, 9, 12, 18, 24,
36, 48, 54
13.0
15.0
31.6
dBm
P
RSENB
Receive
Sensitivity
802.11b
11 -89
dBm
1 -93
P
RSENG
Receive
Sensitivity
802.11g
54 -72
dBm
36 -79 18 -85 6 -90
F
RANGEBG
Frequency
Range
2412 2484
MHz
The transmit power is automatically controlled by the device for minimum power
consumption.
The transmit power at the antenna connector is 15dBm±2dBm.
7.0 Electrical & RF Specification
Table 8- Absolute Maximum Values1
Note: 1. Values are absolute ratings, exceeding these values may cause permanent damage to the device.
Table 9 - RF Characteristics – 802.11b/g
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Band
Supported Data Rates (Mb/s)
802.11b
11, 5.5, 2, 1
802.11g
54, 48, 36, 24, 18, 12, 9, 6
Band
Region
Freq Range
(GHz)
No. of
Channels
Channels
802.11b
US/Canada
2.401 - 2.473
11
1 – 11
Europe
2.401 - 2.483
13
1 – 13
France
2.401 - 2.483
13
1 – 13
Japan
2.401 - 2.495
14
1 – 14
802.11g
US/Canada
2.401 - 2.473
11
1 – 11
Europe
2.401 - 2.483
13
1 – 13
France
2.446 - 2.483
13
1 – 13
Japan
2.401 - 2.483
13
1 – 13
1. Only channels 1, 6 and 11 are non-overlapping.
Table 10 - Supported Data Rates by Band
Table 11 - Operating Channels
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Data Rate
Typical Outdoor Distance
(Unity gain antenna)
Typical Outdoor Distance
(2dBi antenna gain on each end for
B/G mode)
1.0 Mb/s
240m
380m
11.0 Mb/s
135m
215m
6Mb/s 802.11g
135m
215m
6Mb/s 802.11a
49m
155m
54Mb/s 802.11g
12m
19m
54Mb/s 802.11a
4.5m
14m
7.1 AC Electrical Characteristics – Transmitter
Transmit power is automatically managed by the device for minimum power
consumption. The transmit power at the RF connector is +15dBm 2 dBm for
802.11b/g Modes (all rates).
7.2 Performance/Range
The following table illustrates the typical data rates, performance and range the
device is capable of providing using an omni-directional antenna.
Table 12 - Radio Typical Performance Range
Ranges are affected by receiver sensitivity; transmit power, free-space path loss,
antenna gain, and link margin. Actual range will vary from those stated. Non-lineof-site applications will result in typical values less than shown above.
The Data Rate is the supported connection rate for the wireless link, the actual
data throughput for the link will be less than the stated data rates.
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8.0 Antenna
The unit supports antenna connection through a single Hirose U.FL connector, located on
the top surface of the radio next to the RF shielding.
Any antenna used with the system must be designed for operation within the 2.4GHz
ISM band and specifically must support the 2.412GHz to 2.482GHz for 802.11b/g
operation. They are required to have a VSWR of 2:1 maximum referenced to a 50
system impedance.
8.1 Antenna Selection
The Airborne radio supports a number of antenna options, all of which require
connection to the U.FL connectors on the radio. Ultimately the antenna option
selected will be determined by a number of factors, including consideration of the
application, mechanical construction and desired performance. Since the number
of possible combinations is endless we will review some of the more common
solutions in this section. If your application is not covered during this discussion
please contact Technical Support for more specific answers.
In addition to the above options, location and performance need to be
considered. The following sections discuss these items.
8.2 Host Board Mounted Antenna
Host board mounted requires that an antenna connection is physically mounted
to the host system board. It also requires that the host board include a U.FL
connector (two (2) if diversity is being used) to allow a U.FL to U.FL coaxial lead
to connect from the radio to the host board. It will then require 50 matched PCB
traces to be routed from the U.FL connector to the antenna mount.
There are several sources for the U.FL to U.FL coaxial cable these include
Hirose, Sunridge and IPEX. Please contact Quatech for further part numbers and
supply assistance.
This approach can simplify assembly but does require that the host system
configuration can accommodate an antenna location that is determined by the
host PCB. There are also limitations on the ability to seal the enclosure when
using this approach.
This approach also restricts the selection of available antenna. When using this
approach, antennas that screw or press fit to the PCB mount connector must be
used. There are many options for the antenna connector type, however if you
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Quatech, Inc. AirborneDirect™ User Manual
Antenna Type
Features
Cost
Size
Availability
Performance
PCB Embedded
Lowest
Largest
Custom
Poor
Chip
Low
Small
Standard
Poor
Flying Lead
Low
Small
Standard
Fair
wish to utilize the FCC/IC modular approval the connector choice must comply
with FCC regulations. These state that a non-standard connector, e.g. RPTNC/RP-SMA, is required. TNC/SMA connectors are not allowed.
8.3 Host Chassis Mounted Antenna
Host Chassis mounted antennas require no work on the host PCB. They utilize
an antenna type called ‘flying lead’. There are two types of flying leads; one
which provides a bulkhead mounted antenna connector and one which provides
a bulk head mounted antenna. The type you choose will be determined by the
application.
A flying lead system connects a U.FL coaxial lead to the radio’s U.FL connector.
The other end of the coax is attached to either a bulkhead mounted antenna
connector or directly to an antenna that has an integrated bulkhead mount.
In either of the two cases, the use of this approach significantly reduces the
antenna system development effort and provides for greater flexibility in the
available antenna types and placement in the host system chassis.
When using the flying lead antenna (integrated bulk head mounting), there are no
connector choice restrictions for use with the FCC/IC modular certification.
However if the flying lead connector is used, the same restrictions as identified
for the Host Mounted Antenna apply.
There are many suppliers of flying lead antenna and connectors. Quatech’s
Airborne Antenna product line offers a range of antenna solutions.
8.4 Embedded Antenna
Use of Embedded antenna can be the most interesting approach for M2M,
industrial and medical applications. Their small form factor and absence of any
external mounting provides a very compelling argument for their use. There is a
downside to this antenna type and it comes with performance. Antenna
performance for all of the embedded options will, in most cases, be less that that
achievable with external antenna. This does not make them unusable; it will
impact choice of antenna type and requires more focus on placement.
The three main embedded antenna types are PCB embedded, chip (PCB
mounted) and flying lead; each has its advantages and disadvantages (See
Table 13).
Table 13 - Embedded Antenna Options
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PCB Embedded – This approach embeds an antenna design into the host PCB.
This approach is very common with add-in WiFi cards (CF, PCMCIA, SDIO, etc.)
as it requires no external connections and is the cheapest production approach.
The lower production cost requires significant development cost and lack of
performance and flexibility.
Chip – The integration of a chip antenna is simple and requires a relatively small
footprint on the host system, however, it does suffer from the same limitations of
flexibility and performance seen with the PCB embedded approach. There are
relatively large numbers of suppliers of this type of antenna; there is also a range
of configuration and performance options.
Flying Lead – This approach is similar to the flying lead solution for external
antennas. The difference is that the form factors are smaller and provide a range
of chassis and board mounting options, all for internal use. This approach suffers
less from the performance and flexibility limitations of the other approaches,
since the location of the antenna it not determined by the host PCB design. The
assembly of a system using this approach maybe slightly more complex since
the antenna is not necessarily mounted on the host PCBA.
8.5 Antenna Location
The importance of this design choice cannot be over stressed. It can in fact be
the determining factor between success and failure of the WiFi implementation.
There are several factors that need to be considered when determining location:
Distance of Antenna from radio
Location of host system
Proximity to RF blocking or absorbing materials
Proximity to potential noise or interference
Position relative to infrastructure (Access Points or Laptops)
Orientation of host system relative to infrastructure
Is it known
Is it static
To minimize the impact of the factors above the following things need to be
considered during the development process:
Minimize the distance between the radio and the location of the antenna. The
coaxial cable between the two impacts the Transmit Power and Receive
Sensitivity negatively. Quatech recommends using 1.32-1.37mm outer
diameter U.FL coaxial cables.
Minimize the locations where metal surfaces come into contact or are close
to the location of the antenna.
Avoid locations where RF noise, close to or over lapping the ISM bands, may
occur. This would include microwave ovens and wireless telephone systems
in the 2.4GHz and 5.0GHz frequency range.
Mount the antenna as high on the equipment as possible.
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Quatech, Inc. AirborneDirect™ User Manual
Locate the antenna where there is a minimum of obstruction between the
antenna and the location of the Access Points. Typically Access Points are
located in the ceiling or high on walls.
Keep the main antenna’s polarization vertical, or in-line with the antenna of
the Access Points. 802.11 systems utilize vertical polarization and aligning
both transmit and receive antenna maximizes the link quality.
Even addressing all of the above factors does not guarantee a perfect
connection, however with experimentation an understanding of the best
combination will allow a preferred combination to be identified.
8.6 Performance
Performance is difficult to define as the appropriate metric changes with each
application or may indeed be a combination of parameters and application
requirements. The underlying characteristic that, in most cases, needs to be
observed is the link quality. This can be defined as the bandwidth available over
which communication between the two devices can be performed. The lower the
link quality the less likely the devices can communicate.
Measurement of link quality can be made in several ways: Bit Error Rate (BER),
Signal to Noise (SNR) ratio, Signal Strength, and may also include the addition of
distortion. The link quality is used by the radio to determine the link rate.
Generally as the link quality for a given link rate drops below a predefined limit,
the radio will drop to the next lowest link rate and try to communicate using it.
The reciprocal is also true. If the radio observes good link quality at one rate it
will try to move up to the next rate to see if communication can be sustained
using it. It is important to note that for a given position the link quality improves as
the link rate is reduced. This is because as the link rate drops the radios Transmit
power and Receive sensitivity improve.
From this it can be seen that looking at the link rate is an indirect way of
assessing the quality of the link between the device and an Access Point. You
should strive to make the communication quality as good as possible in order to
support the best link rate. However be careful not to over specify the link rate.
Consider your application’s bandwidth requirements and tailor your link rate to
optimize the link quality. For example, the link quality for a location at 6Mb/s is
better than it would be for 54Mb/s. If the application only needs 2Mb/s of data
throughput, the 6Mb/s rate would provide a better link quality.
Aside from the radio performance, there are a number of other things that
contribute to the link quality. These include the items discussed earlier and
choices made when looking at the overall antenna gain. The antenna gain
contributes to the Equivalent Isotropically Radiated Power (EIRP) of the system.
This is part of an overall measurement of the link quality called link margin.
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