3Com 3CRWE20096A - Wireless LAN Access Point 2000 User manual

http://www.3com.com/
http://support.3com.com/registration/frontpg.pl/
11 Mbps Wireless LAN
Access Point 2000
User Guide
The simple, affordable way to network without wires.
Version 1
Published February, 2002
Version 1.0.3

3Com Corporation
5400 Bayfront Plaza
Santa Clara, California
95052-8145
Copyright © 2002 3Com Corporation. All rights reserved. No part of this documentation may be
reproduced in any form or by any means or used to make any derivative work (such as translation,
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please contact 3Com and a copy will be provided to you.
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If you are a United States government agency, then this documentation and the software described herein
are provided to you subject to the following:
All technical data and computer software are commercial in nature and developed solely at private expense.
Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995)
or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are
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authorization prior to export or import to another country.

C ONTENTS
I
NTRODUCTION
Product Registration and Support 5
I
NSTALLING AN
A
CCESS
P
OINT
Before You Begin 7
Where should I Place the Access Point? 7
Do I Need to Configure the Access Point? 7
Connecting the Access Point 8
Checking the LED Indicators 8
Summary of Configuration Steps 9
Installing the Infrastructure Device Manager 9
C
ONFIGURING THE
A
CCESS
P
OINT
2000
Launching a Wireless Device Configuration 11
Changing Access Point Properties 12
Setting Network Properties 13
Access Point Network 13
Wireless DHCP Server 13
Setting Data Transmission Properties 14
Changing Encryption Settings 14
No Security (Open System) 14
40-bit Shared Key (Wi-Fi) 14
128-bit Shared Key 15
Changing the Administration Password 15
Using Configuration Templates 15
Creating a Template 15
Loading a Template 15
Saving Access Point Configurations 15
Backing up an Access Point Configuration 16
Restoring an Access Point Configuration 16
Viewing System Status 16
Upgrading the System 16
Downloading Upgrade Files 16
Installing an Upgrade 17
Restoring an Access Point to Factory Defaults 17
Interoperating with Third-Party Equipment 17

T
ROUBLESHOOTING
Diagnosing Problems 19
Uninstalling Software Utilities 20
W
IRELESS
LAN B
ASICS
How Does a Wireless LAN Work? 21
Network Association 21
Roaming 21
Security 21
Ad Hoc Networks 21
Setting Up a 3Com Wireless LAN 22
All Wireless Networks 22
Wired/Wireless Networks 22
T
ECHNICAL
S
UPPORT
Online Technical Services 25
World Wide Web Site 25
3Com Knowledgebase Web Services 25
3Com FTP Site 25
Support from Your Network Supplier 26
Support from 3Com 26
Returning Products for Repair 28
R
EGULATORY
C
OMPLIANCE
I
NFORMATION
I
NDEX

1
I
NTRODUCTION
3Com wireless systems let you simply and confidently extend network information
and applications to difficult-to-wire locations and to your mobile workforce,
making your business more productive, competitive and successful. The 3Com 11
Mbps Wireless LAN Access Point 2000 is the affordable choice for extending your
network to places where wires cannot go.
A single access point can make the Internet, e-mail, and network resources such
as printers available to dozens of wireless client users. And because 3Com 11
Mbps Wireless LAN equipment is Wi-Fi certified, you can be sure it will work
reliably with certified equipment from other manufacturers.
Product Registration
and Support
To register your product with 3Com, go to the following Web page:
http://support.3com.com/registration/frontpg.pl
For support information, see “Technical Support” on page 25 or log on to the
3Com Web site at http://www.3com.com and navigate to the product
support page.

6 C
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2
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Before You Begin The following items, which are provided with the 3Com 11 Mbps Wireless LAN
Access Point 2000, are required for installation:
■
Power adapter and power cord.
■
Ethernet crossover cable.
Before you connect the access point, decide where to place it and whether you
need to configure it.
Where should I Place the
Access Point?
You should place the access point in a dry, clean location near a power source and
an Ethernet connection, and away from transformers, heavy-duty motors,
fluorescent lights, microwave ovens, refrigerators, or other equipment that could
cause radio signal interference.
Do I Need to Configure
the Access Point?
If your 3Com Wireless LAN has only one access point, a few clients, and no special
security requirements, you can use the 3Com access point just as it was shipped
from the factory. 3Com recommends that you set encryption to secure the
network.
To use the administration tool, which helps you select 3Com wireless LAN devices
and launch their configurations, you need a computer running one of the
following operating systems and Internet Explorer 5.0 or later.
■
Windows XP
■
Windows 2000
■ Windows NT 4.0
■
Windows Me
■
Windows 98
■ Windows 95
The following table shows the access point configuration factory defaults.
Property Default Setting
Device Name 3Com Access Point 2000
Device Location None
WLAN Service Area 3Com
Help File Location Local Drive
Help File Path C:\Program Files\3Com\3Com Wireless Infrastructure Device
Manager\ManagementHelp\AP2000

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If the configuration that was set at the factory does not meet your network
requirements, or if you want to customize settings, see “Summary of
Configuration Steps” on page 9.
Connecting the
Access Point
Place the access point on a flat surface such as a table, desktop, or the top of a
cabinet and connect it to power and to a port on your hub or switch as
shown below.
Checking the LED
Indicators
When the access point is connected to power, two LEDs indicate activity
as follows:
Access Point Network Obtain an IP address automatically (Used if a DHCP server
is available. If a DHCP server does not assign it an IP address, the
access point’s default IP address is 169.254.xxx.1, where xxx is
the last byte of the access point’s MAC address))
Wireless DHCP Server Enabled
Clear Channel Select Automatically select the best channel
Network Traffic Accelerator Off (Wi-Fi interoperable)
Data Preamble Long (Wi-Fi interoperable)
Encryption Setting No Security (Open System)
Administration Password None
Property Default Setting
Crossover
cable
For correct operation, use the provided Ethernet crossover cable. If you use a
standard straight-through (UTP) Ethernet cable, you must connect to the hub’s
uplink (MDIX) port.
LED Indicator Location Description
Wireless
association On the top of
the access
point
■
On—Unit is receiving power.
■
Off—Unit is not receiving power.
■
Blinking—The unit is transmitting or receiving. Faster
blinking indicates faster transmission speed.
Ethernet
connection At the RJ45 Ethernet conn
ector
■
On—Unit has an Ethernet connection.
■
Off—Unit does not have an Ethernet connection.
■
Blinking—Wired LAN traffic is detected. Faster blinking
indicates heavier traffic.

Summary of Configuration Steps 9
Summary of
Configuration Steps
After you connect the access point, you may need to change its configuration
settings. The default configuration settings are shown in “Do I Need to Configure
the Access Point?” on page 7. To change these settings, follow these steps:
1 Install the 3Com Wireless Infrastructure Device Manager on a computer as
described in “Installing the Infrastructure Device Manager”.
2 Launch the device manager and select the access point as described in “Launching
a Wireless Device Configuration” on page 11.
3 Use the 3Com 11 Mbps Wireless LAN Access Point 2000 Configuration
Management System to change and save the settings. For details, see
“Configuring the Access Point 2000” on page 11.
Installing the
Infrastructure Device
Manager
The 3Com installation CD contains the 3Com Wireless Infrastructure Device
Manager, an administration tool that helps you select 3Com wireless LAN devices
and launch their configurations in your Web browser. The device manager must
be installed on a computer that is on the same network segment or that can
associate with the access point and is running one of the Windows
operating systems and Web browsers listed in “Before You Begin” on page 7.
Follow these steps to install the device manager:
1 Turn on the computer.
2 Put the 3Com CD in the CD-ROM drive.
The setup menu appears. If it does not appear, you can start the setup menu from
the Windows Start menu. For example:
Start/Run/D:setup.exe .
3 In the menu, click Install the Tools and Documentation .
4 In the next screen, click Install the Administration Tool .
5 Follow the instructions on the screens to complete the installation.
If you are prompted to reboot the computer, do so.
6 To launch the tool from the Windows Start menu. Select Start/Programs/3Com
Wireless Infrastructure Device Manager/3Com Wireless Infrastructure
Device Manager
For details on using the tool, see “Launching a Wireless Device Configuration” on
page 11.

10 C
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3CONFIGURING THE ACCESS POINT 2000
If the configuration that was set at the factory does not meet your network
requirements, or if you want to customize the settings, you can use these tools to
change the configuration:
■3Com Wireless Infrastructure Device Manager—The Device Manager helps
you locate 3Com wireless LAN infrastructure devices on the same network
segment as your computer. It displays the devices in a tree format, from which
you can select a device and view its properties, and launch the device’s
configuration management system in your Web browser.
To configure an Access Point 2000, the device manager must be installed on a
computer that can associate with the access point or is on the same network
segment as the access point, and is running a supported operating system and
Web browser.
■3Com 11 Mbps Wireless LAN Access Point 2000 Configuration
Management System—Resides on the Access Point 2000 and lets you
configure that access point through your Web browser. This tool is launched
using the 3Com Wireless Infrastructure Device Manager.
Launching a Wireless
Device Configuration Make sure that the 3Com Wireless Infrastructure Device Manager is installed. The
device to be configured must be connected to power and, depending on its type
(for example, access point or workgroup bridge) it must be either wired to the
network, associating with the wireless network, or, in some cases with the
workgroup bridge, connected directly to the computer. If there is more than one
device with the same name in the network (for example, 3ComWWB), make a
note of the MAC address of the device you want to select so that you can identify
it in the device manager.
1To launch the device manager, select Start/Programs/3Com Wireless Infrastructure
Device Manager/3Com Wireless Infrastructure Device Manager.
If you have more than one network adapter installed on your computer, you may
be prompted to choose a network adapter. Choose the appropriate adapter and
click OK.
The Wireless Network Tree appears in the 3Com Wireless Infrastructure Device
Manager window. The tree lists all WLAN service areas on the network and
expands to show the 3Com wireless LAN devices that are associated to each
service area. Devices in a different subnet than your computer are identified with
exclamation points (!). You can refresh this display by clicking Refresh. You should
refresh the display, for example, after you change a device IP address.
2In the Wireless Network Tree, select the device you want to configure.

12 CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
If more than one wireless LAN device appears in the tree and you are not sure that
you have selected the right one, click Properties and check the MAC address to
verify that it is the one you want.
3Click Configure.
If the selected device is on the same subnet as your computer, the configuration
main page appears in your Web browser.
If the selected device is on a different subnet, the device manager helps you to
assign an IP address on the same subnet as your computer. You may accept the
address offered or enter an address and click Next. The next window prompts for
an administrative password to allow the new IP address to be set. If this is the first
time the device is being configured, leave the password field blank and click Next.
The configuration main page appears in your Web browser.
The following table describes the functions of the buttons in the 3Com Wireless
Infrastructure Device Manager window.
Changing Access Point
Properties Under System Configuration, click Access Point Properties. The Access Point
Properties page displays the properties of the selected access point. You can
change properties by entering values in the fields and clicking the radio buttons
(see the following table). When you are finished, click Save.
The following table describes the properties.
Button Description
Properties Displays the following properties of the selected device: Device Name, Device
Type, Wireless LAN Service Area (ESSID), IP Address, Subnet Mask, and
MAC Address.
Configure Launches the configuration for the selected device. If the selected device is on
a different subnet, you are prompted to assign an address on the same subnet
as your computer.
Refresh Scans the network and displays the connected 3Com 11 Mbps Wireless
LAN devices.
Choose NIC If your computer has more than one network interface card installed, allows
you to choose which card to use.
Close Closes the device manager window and ends the session.
Help Launches the device manager help page in your browser.
Property Description Default Value
Device Name You can change the default name to one of
your choice. 3Com Access Point 2000
Device Location Optionally, you can enter the location of the
access point. None
WLAN Service Area To enable clients to roam among multiple
access points, the access points must have
identical WLAN service areas. To maintain
wireless association, the WLAN service area on
the client and the access point with which it is
associated must match exactly. Therefore, if
you are associated with the access point that
you are configuring and you change the access
point WLAN service area, make sure to change
the client WLAN service area also.
3Com

Setting Network Properties 13
Setting Network
Properties Under System Configuration, click Network Properties. The Network
Configuration page appears, where you can change the settings described below.
Access Point Network This setting allows you to change the IP address of the access point.
To let the access point get an IP address automatically, click Obtain an IP address
automatically and click Save.
To specify an IP address, click Specify an IP address, enter the IP address
parameters in the spaces provided, and click Save.
If you change the IP address, you cannot continue to configure the access point
using the old IP address. Therefore, if you want to continue configuring this access
point after you save this change, you must do the following:
1Close your browser.
2Return to the device manager and click Refresh.
3Select the access point and click Configure to start a new configuration session.
When you specify an IP address, the access point cannot act as a DHCP server.
Make sure that clients are using IP addresses on the same network.
Wireless DHCP Server If your wired network has a DHCP server, it is recommended that you use it.
However, the access point provides a DHCP server so that operating systems that
do not support automatic IP addressing can communicate with it.
If a DHCP server does not assign it an IP address, the access point’s default IP
address is 169.254.xxx.1, where xxx is the last byte of the access point’s MAC
address. When it is acting as a DHCP server, the access point can assign up to 253
IP addresses to currently associated wireless clients. The IP addresses range from
169.254.xxx.2 to 169.254.xxx.254.
If the access point detects that another DHCP server is available, all wireless clients
get IP addresses from that DHCP server.
If your wired LAN DHCP server goes down, the access point assigns IP addresses
after the lease periods on the previous IP addresses expire.
To let the access point act as a DHCP server when there is no other DHCP server
available, click Enable and click Save.
Help File Location ■Web Server: Help files are located on the
network at the specified Help File Path.
■Local Drive: Help files are located on your
computer at the specified Help File Path.
Local Drive
Help File Path The location of the Configuration
Management System help files on the web
server or on the local drive.
C:\Program Files\3Com\
3Com Wireless
Infrastructure Device
Manager\Management
Help\AP2000
Property Description Default Value

14 CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
To turn off the access point DHCP server capability regardless of whether or not
another DHCP server is available, click Disable and click Save.
Setting Data
Transmission
Properties
Under System Configuration, click Data Transmission Properties. The Data
Transmission Properties page appears, where you can select radio channel settings
and performance settings.
■Clear Channel Select—To allow the access point to find a channel
automatically, click the Automatically select the best channel radio button.
When this option is enabled, the access point scans the primary channels to
determine the traffic on those channels and chooses the channel with the least
number of packets.
To select a specific channel, click the Specify the channel check box and choose
a channel from the Channel list.
■Network Traffic Accelerator—To increase performance, click On (Enhanced
performance). If you experience problems when equipment other than 3Com
11 Mbps Wireless LAN equipment is being used, click Off.
■Data Preamble—To increase performance, click Short (Enhanced
performance). When equipment that does not support short preamble is also
being used, click Long. To achieve association, wireless device preamble lengths
must match.
When you are finished making your selections, click Save.
Changing Encryption
Settings Under Security, click Encryption. The Security Setup page appears, where you can
select the type of security to be used on the access point. The access point can be
configured to support one type of security at a time. You can change the settings
by entering values in the fields and clicking the radio buttons. When you are
finished, click Save.
The following sections describe the settings. To maintain wireless association, the
settings on clients and the access points they associate with must match exactly.
No Security (Open
System) No encryption is used. The network communications could be intercepted by unintended recipients.
40-bit Shared Key (Wi-Fi) This option encrypts the wireless transmissions to protect data, but still allows
communication among compatible wireless LAN clients and access points from
third-party manufacturers that are Wi-Fi certified.
This type of security requires you to set up encryption in one of the following
ways:
■String—For use only with other 3Com 11 Mbps wireless LAN devices, an
encryption string is a case-sensitive string of characters between 6 and 30
characters long. To enter the string, click Enter a string to generate shared keys.
Then type any combination of letters and numbers in the space provided and
click Save.
■Shared keys—Hexadecimal keys are sequences of hexadecimal digits arranged
into four keys. A hexadecimal digit may be a letter from A to F or a number

Changing the Administration Password 15
from 0 to 9. This type of encryption is compatible with equipment from other
manufacturers that use Wi-Fi certified 40-bit encryption. To enter the keys, click
Specify shared keys and which to use. Then click To specify and select the
shared keys. In the shared keys window, enter all four keys in the provided
spaces, then click a radio button in the Selected Key column to specify which
key to use, and click Save.
128-bit Shared Key This option can be used with other 3Com 11 Mbps Wireless LAN devices and with
equipment from certain manufacturers that also support 128-bit shared key
encryption. It provides a higher level of security than the 40-bit Shared Key (Wi-Fi)
option and uses a more complicated type of encryption. This type of security
requires you to set up encryption using a string or shared keys as described in
“40-bit Shared Key (Wi-Fi)” on page 14.
Changing the
Administration
Password
Under Tools, click Change Password. The Change Administration Password page
appears, where you can change the administration password for the access point.
Enter the current password and new password in the spaces provided and click
OK.
Using Configuration
Templates Configuration templates help you to copy standard parameters from one access
point to another. Use of templates makes configuring access points easier and faster
because after you save a template, you can load it to another access point.
Creating a Template
1Set the basic access point parameters in the System Configuration pages.
If you set specific parameters such as the Device Name or a specific IP address,
these parameters will not be saved in the template.
2Under Save/Restore Files, click Save Template.
3In the Save Configuration Template page, click Save Template.
4Specify a name and location for the template, and click OK.
Loading a Template
1In the Wireless Network Tree, select an access point and click Configure.
2Under Save/Restore Files, click Load Template.
3Click Browse and select the a configuration template to upload to the access
point.
4Click Load Template.
The configuration template is applied to the access point.
Saving Access Point
Configurations As part of system maintenance, you should save and back up the configurations of
individual access points in case you need to reload them in the future. The backup
saves all the parameters of the selected access point in a file on your computer.
The file can be used later to restore the access point configuration.

16 CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
The difference between saving a configuration template and creating a backup
configuration is that the configuration template only picks up basic parameters,
which can then be loaded to more than one access point. The backup saves all
parameters and is meant to be loaded to a specific access point.
Backing up an Access
Point Configuration
1Set the access point parameters in the System Configuration pages.
2Under Save/Restore Files, click Backup Access Point.
3In the Backup Access Point Configuration page, click Backup Now.
4Specify a name and location for the backup, and click OK.
Restoring an Access
Point Configuration
1In the Wireless Network Tree, select an access point and click Configure.
2Under Save/Restore Files, click Restore Access Point.
3In the Restore Access Point page, click Browse and select the backup file to upload
to the access point.
4Click Restore.
The configuration is restored and activated on the access point.
Viewing System
Status Under System Status, you can view the following information:
■Click Currently Associated Clients to see a list of the MAC addresses of the
wireless clients currently associating with the access point.
■Click System Summary to see information about the access point.
Upgrading the System You can download firmware updates or updates of the Web server file system (the
files that make up the Configuration Management System) from the 3Com Web site
at http://www.3com.com and install those updates on the access point. To avoid
problems that could occur if a wireless association were interrupted during the
upgrade, it is recommended that you perform the upgrade from a computer that is
wired to the LAN. Make sure the computer is on the same network as the access
points that you are configuring.
Downloading
Upgrade Files To locate upgrade files and download them to your computer:
1Log on to the 3Com Web site at http://www.3com.com.
2Navigate to the product support page.
3Navigate to the software download page and locate the files you want to
download.
If you upgrade both the firmware and the Web server file system, be sure to
upgrade the Web server file system first.

Restoring an Access Point to Factory Defaults 17
4Follow the instructions to download the files into a directory on your computer.
Installing an Upgrade
1In the Wireless Network Tree, select the access point to be upgraded and
click Configure.
2Under Tools, click Upgrade System.
3Select the item to upgrade:
To upgrade the Web server file system, click the Configuration System Firmware
radio button.
To upgrade firmware, click the Access Point Firmware radio button.
4Click Browse, select the upgrade file that you downloaded earlier, and click OK.
If you choose the wrong file, click Clear Entry. The selected file is cleared and you
can browse again for a different file.
5Click Upgrade.
The upgrade file is copied from your computer to the access point and the access
point restarts using the new upgrade.
Restoring an Access
Point to Factory
Defaults
You can restore access point settings to the defaults that were set at the factory by
inserting a pointed object (such as the point of a straightened paper clip) into the
reset hole on the front near the RJ-45 connector and holding for five seconds.
Interoperating with
Third-Party Equipment Because 3Com 11 Mbps Wireless LAN equipment complies with IEEE 802.11b
standards, it can interoperate with third-party equipment that also complies with
the standards. However, some third party equipment may not support 3Com
enhanced performance features. You may need to turn off the Network Traffic
Accelerator and set the Data Preamble to long to support this equipment on
the network.

18 CHAPTER 3: CONFIGURING THE ACCESS POINT 2000

4TROUBLESHOOTING
Diagnosing Problems If you have difficulty with the access point, try the solutions in the following table.
Symptom Solutions
Access point does not
power up. Make sure the power adapter cables are plugged in securely.
Check for a faulty access point power supply.
Check for a failed AC power supply
No operation. Verify the access point configuration.
Review access point firmware revisions and update firmware
if necessary.
Make sure that there are no duplicate IP addresses on the
network. Unplug the access point and ping the assigned
address to make sure that no other device responds to that
address.
Access point powers up, but
has no connection to the wired
network.
Make sure that the Ethernet cable is plugged in securely.
Verify the network wiring and topology for proper
configuration:
■Use the provided Ethernet crossover cable. If you use a
standard straight-through (UTP) Ethernet cable, you must
connect to the hub’s uplink (MDIX) port.
■Verify that the wireless client is operating correctly.
Access point powers up, but
does not associate with
wireless clients.
Confirm that the WLAN service area on the access point
matches that on the clients.
Verify that the clients are operating correctly.
Make sure that security settings on the access point match
those on the clients.
Make sure the preamble lengths match.
Try repositioning the access point to improve reception.
Check the range and move clients closer if necessary.
A client cannot associate with
the access point even though
configuration settings appear
to match.
If the access point is set to find a channel automatically, it
may be choosing a channel that the client does not support.
Set the access point to use a channel within the range
supported by the client.
Slow or erratic performance. Try changing the wireless channel on the access point.
Check the access point connectors and cabling for
loose connections.
Check the wired network topology and configuration
for malfunctions.
Running on a computer
connected to the wired LAN,
the 3Com Wireless
Infrastructure Device Manager
cannot find an access point.
Make sure that the computer is connected to the same
network segment as the access point.
If your computer has more than one network interface card
installed, make sure you have chosen the right one.

20 CHAPTER 4: TROUBLESHOOTING
Uninstalling Software
Utilities If you want to uninstall the 3Com 11 Mbps Wireless LAN software utilities, you
can either use the standard operating system procedure for removing programs or
use the following shortcut procedure:
1From the Windows Start menu, select Programs, then 3Com 11Mbps Wireless
LAN, then Uninstall 3Com 11Mbps Wireless LAN.
2When prompted to confirm, click OK.
While you are configuring the
access point, the Configuration
Management System stops
responding.
To maintain wireless association, the WLAN service area on
the client and the access point with which it is associated
must match exactly. Therefore, if you are associated with the
access point that you are configuring and you change the
access point WLAN service area, make sure to change the
client WLAN service area to match.
If you change the IP address and save the change, the
browser stops responding. You maintain network
association, but you cannot continue to configure the access
point using the old IP address. Therefore, if you want to
continue configuring this access point after you save this
change, you must do the following:
1Close your browser.
2Return to the device manager and click Refresh.
3Select the access point and click Configure to start a new
configuration session.
After you specify an IP address
for an access point, the device
manager continues to point to
the old IP address when you
select the access point in the
Wireless Network Tree.
In the device manager window click the Refresh button to
refresh the Wireless Network Tree. Then click the access point
in the Wireless Network Tree and click Properties. The IP
address you specified is now listed. If you want to continue
configuring the access point, click Configure.
Your wired LAN DHCP server
malfunctions, but the access
point DHCP server fails to
assign IP addresses.
If the Wireless DHCP Server property on the access point is
enabled, the access point assigns IP addresses after the lease
periods on the previous IP addresses expire. If you want to
force the access point to start assigning IP addresses before
the lease periods expire, unplug the access point from the
power source and plug it back in to reboot it.
The access point stops
assigning IP addresses after you
assign it an IP address.
Set the access point to obtain an IP address automatically. It
cannot act as a DHCP server when it has an assigned
IP address.
PC Cards other than 3Com
11 Mbps Wireless LAN PC
Cards cannot communicate
with the access point.
The cards may not support the access point’s enhanced
performance features. Try turning the Network Traffic
Accelerator off and setting the Data Preamble to long.
Symptom Solutions