3Com Network Router 3CRWE920G73 User Manual

Quick Start Guide  
802.11g 54Mbps WLAN Building to Building  
Bridge  
Outdoor: 3CRWEASYG73  
Indoor:  
3CRWE920G73  
Published July 2005  
Quick Start guide version2.0.1  
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2
Package Contents  
Please ensure that the package is complete before beginning with the installation. The package should include the  
following components:  
3CRWE920G73  
3CRWEASYG73  
Indoor 802.11g 54Mbps Building to Building Bridge  
Outdoor 802.11g 54Mbps Building to Building Bridge  
3Com 802.11g Wireless indoor Bridge  
Mounting kit for wall or ceiling mount  
CD-ROM containing software and documentation  
Single-Port PoE Feeder.  
Note: Indoor Bridge does not ship with an antenna.  
See www.3com.com or your reseller for antenna  
options.  
3Com 802.11g Wireless Outdoor Bridge  
Mounting kit for wall or mast mount  
CD-ROM containing software and documentation  
Single-Port PoE Feeder.  
Lightning arrestor  
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3
Hardware Installation  
Installing the 3CRWE920G73 Indoor Wireless Bridge  
On a flat surface  
1
2
Find a surface that is clear of debris.  
Set the bridge down on its four rubber feet.  
On a wall  
1
Use the mounting template as a guide to make two marks 7.40cm (2.91 inches) apart on the wall.  
Use the vertical line on the template to ensure that the placement of the marks is plumb to the wall.  
2
Drill holes at the marks.  
Use a 5-mm (3/16-inch) drill bit if using the provided screw anchors; use a 3-mm (1/8-inich) drill bit if using the screws  
only.  
3
4
Install the two flathead screws at the marks on the wall.  
Leave the screw heads protruding 6-mm (1/4 inch) from the surface of the wall.  
Hang the bridge on the screws, using the mounting holes on the back of the bridge.  
On an acoustical ceiling  
1
2
3
Attach the mounting bracket to the back of the bridge with two number 6 panhead screws.  
Align the T-rail grips with the ceiling T-rail, and adjust them so that they grip the T-rails securely.  
Tighten the screws on each T-rail grip.  
After installation, there may be some play in the fit of the T-rail grips if the T-rails are very narrow. If necessary, add a  
shim to achieve a secure grip.  
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Connect the antenna  
1
2
Connect one end of the antenna cable to the antenna.  
Connect the free end of the antenna cable to the connection on the bridge.  
Follow the instructions that come with the antenna and follow these general guidelines:  
For best performance, place the antenna using the mounting hardware provided with the antenna. Outdoor  
placement is especially important if the building is of metal construction or has metal siding. If necessary, you can  
mount an antenna inside a building; however, indoor placement reduces the antenna’s effective range.  
To ensure the physical safety of anyone near the antenna and to prevent damage to the bridge, follow the building  
codes for antenna installations in your area.  
Position the antenna so that there are minimal obstacles between it and any other antenna with which it will  
communicate. While maintaining a direct line of sight between antennas is not strictly necessary, such an  
arrangement helps to ensure a strong signal. Ensure that access is available for routing the antenna cable from the  
antenna to the bridge. When mounting an antenna indoors, best performance can be achieved by mounting the  
antenna near a window facing the opposite bridge.  
Make certain that the antenna and antenna mast are appropriately grounded. Proper grounding prevents injury or  
damage from lightning strikes.  
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Installing the 3CRWEASYG73 Outdoor Wireless Bridge  
Mount the Unit to a Mast  
Follow the instructions that come with the bridge mounting hardware and follow the general guidelines listed below.  
NOTE:  
Mast should extend above  
bridge 1 meter (3 ft)  
Recommended Pole Diameter =  
2’’ -- 2.5’’  
Maximum Pole Diameter = 3’’  
Bridge may be installed to  
freestanding or roof mounted  
mast  
For best performance, place the antenna outdoors using the mounting hardware provided with the antenna.  
Placement is especially important if the building is of metal construction or has metal siding. If necessary, you can  
mount an antenna inside a building; however, indoor placement reduces the antenna’s effective range.  
To ensure the physical safety of anyone near the antenna and to prevent damage to the bridge, follow the building  
codes for antenna installations in your area. This is another good reason to make sure that only a professional  
performs the installation.  
Keep in mind that in order to comply with FCC radio-frequency radiation exposure guidelines, a minimum body to  
antenna distance of 2 meters (6 feet) must be maintained while operating this device.  
Ensure that access is available for routing the Ethernet cable from the bridge to the Ethernet connection inside.  
Make certain that the antenna mast is appropriately grounded. Proper grounding can prevent injury or damage from  
lightning strikes.  
After installing the bridge, the highest allowable power level is automatically set when country selection is  
configured. Adhering to this configuration ensures compliance with national laws.  
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Align and Polarize the Units  
For optimal performance, position the antenna so that there are minimal obstacles between it and any other antenna with  
which it will communicate. While maintaining a direct line of sight between antennas is not strictly necessary, such a  
configuration helps to ensure a strong signal. As mentioned earlier, this is not always possible in long distance  
configurations.  
Any two bridge units that are to communicate with each other must be set for the same polarization, either horizontally or  
vertically. If cross-polarization occurs, the link with either work poorly or not at all. Please refer to the ‘‘Polarization’’  
section of the User Guide for further details. The following illustration shows proper alignment, orientation and  
polarization for optimal performance.  
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Antenna Specification  
The following antennas and cables are available from 3Com Corporation:  
Antennas  
3CWE591 - 6/8dBi Dual-Band  
Omni directional Antenna  
3CWE598 - 8/10dBi Dual-Band Panel  
Antenna  
3CWE495 13 dBi Sector-Panel  
Directional  
3CWE596 - 18/20dBi Dual-Band  
Panel Antenna  
Ultra Low Loss Coaxial  
Antenna Cables:  
3CWE580 (6 foot)  
3CWE581 (20 foot)  
3CWE582 (50 foot)  
NOTE: Because of power level restrictions, use of the 3CWE495 13dBi and 3CWE596 18dBi antennas is not  
allowed in some countries.  
The highest allowable power level is set automatically when you configure antenna selection after installing the bridge.  
To comply with power restrictions, identical antennas using 6-foot cable must be separated by at lease the minimum  
distances shown below:  
Minimum Distance for Full Throughput (approximate)  
Antenna (dBi)  
Meters  
200  
50  
Yards  
218  
55  
18  
13  
8
10  
11  
4
2
2
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Connect to the Power Source and the Local Network  
3CRWE920G73 Indoor Wireless Bridge  
Connect a twisted pair CAT5 Ethernet cable from  
the ’’To Hub/Switch’’ port of the PoE Adapter to a  
free port on the hub or switch within the local  
network  
3CRWEASYG73 Outdoor Wireless Bridge  
NOTE: 3Com recommends that you use a weatherproof and shielded CAT5 cable to help protect the Bridge and your  
network equipment from lightning and power surges.  
If the Bridge failed to power on or if it lost power, the automatic shutdown feature that is built into the PoE injector may have been  
activated to protect the Bridge from power surges. Try resetting the PoE injector.  
To reset the PoE injector:  
1. On the PoE injector, unplug the CAT5 cables that connect to the Bridge and the Switch.  
2. Unplug the power cord, and then wait for the PoE injector to automatically reset itself back to default. The reset process  
normally takes about five minutes.  
3. Reconnect the power and CAT5 cables to the PoE injector, and then wait for the Bridge to complete its startup process. This  
normally takes about one minute.  
To verify that you have successfully reconnected the Bridge to the network, use WIDMAN to search for the Bridge. It should appear in  
the list of detected network devices. If WIDMAN cannot detect the Bridge, please contact 3Com Customer Support.  
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LED Indicators  
After the correct connection, the Power LED and the Ethernet link LED of the 3CRWE920G73 indoor bridge should light  
up. On the front of the Wireless Bridge you will find three LEDs  
POWER  
WIRELESS  
ETHERNET  
1
2
3
POWER LED  
Off: Power supply connection not available or broken  
On: Power supply connection OK  
WIRELESS activity LED  
Off: No activity  
Blinking: Sending and receiving data  
ETHERNET LAN link LED  
Off: No LAN connection available  
On: LAN connection OK  
4.  
Software Installation  
Insert the installation CD-ROM delivered with the 3Com WLAN Building to Building Bridge into your CD-ROM drive  
The installation wizard starts automatically and will guide you through the rest of the installation process. If the installation  
wizard does not start automatically, run ‘‘setup.exe’’ from the root directory of the installation CD. Then choose to install  
the 3Com Wireless Infrastructure Device Manager (WIDMAN) utility for helping you find the Bridge and configure its IP  
address.  
The 3Com Installation CD contains the following tools and utilities:  
3Com Wireless Infrastructure Device Manager (WIDMAN) an administration tool that helps you selects 3Com  
wireless LAN devices and launches their configurations in your Web browser.  
3Com 3CDaemon Server Tool -- a firmware upgrade tool that can act in four different capacities:  
As a TFTP Server, necessary for firmware upgrades, and backup and restore functions. Use this option if you do not  
have a TFTP server set up.  
As a SysLog Server, which is necessary to view SysLog messages.  
As an optional TFTP Client.  
As an optional FTP Server.  
[NOTE: It is recommended that you install the 3CDaemon Server tool if you do not already have a firmware tool for  
upgrades on your computer.]  
To install one of the tools on your computer:  
1
2
Turn on the computer;  
Insert the 3Com Installation 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
4
5
In the menu, click Tools and Utilities.  
In the next screen, click the tool you want to install.  
Follow the instructions on the screens to complete the installation.  
Reboot the computer if prompted to do so.  
6
Launch the tool from the Windows Start menu.  
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5
Find your New Wireless Bridge  
To find your new Wireless Bridge you will need to connect the Wireless Bridge to the same physical LAN network as your  
PC. By default, the Wireless Bridge will use DHCP Client mode to get an IP address from a DHCP Server. If your network  
does not have a DHCP server, the Bridge uses a default IP address of 169.254.X.Y, where the X and Y is the last two bytes  
of the MAC address in decimal value respectively. You can use that default IP address to configure the Wireless Bridge  
through a web browser directly.  
To find your new Wireless Bridge, open the 3Com Wireless Infrastructure Device Manager (WIDMAN) utility. On start up,  
the dialog box will look like the figure below:  
Click the ‘Refresh’ button and the 3Com Wireless Infrastructure Device Manager (WIDMAN) utility will begin to discover  
devices. After finding the new Wireless Bridge, it will list it in the list box.  
Choose the Wireless Bridge in the list box, and then click the ‘Configure…’ button. The web browser wills pop-up, and it  
will bring you to the WEB UI of the Wireless Bridge.  
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If 3Com Wireless Infrastructure Device Manager (WIDMAN) finds that your PC cannot connect to the Wireless Bridge by IP,  
it would pop-up a dialog requesting that you change the IP address of the device. Then the utility will prompt you to enter  
the password of the bridge. [Note: default password is ‘‘blank’’]  
If the password is correct, you will be able to configure it through the WEB UI.  
[NOTE: It can take up to 60 seconds for the 3Com Building to Building Bridge to boot up after power has been  
connected. The Bridge will not appear in the WIDMAN utility unit boot up is complete. Click the REFRESH button  
occasionally until the Bridge appears.]  
The first time you configure the Wireless Bridge, you will see an initial Settings page. In this page, you will setup the  
username/password for administrator access. On international versions of the Bridge, you will select Country Settings on  
this page as well.  
For more detailed settings of the Wireless Bridge, please refer to ‘‘3Com 802.11g 54Mbps Wireless Building to Building  
Bridge User’s Guide’’.  
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6
Default Settings.  
Property  
Default Setting  
Device Name  
Country  
3Com Building-to-Building Bridge  
For U.S. version, United States  
For non-U.S version, set by the user  
Obtain IP address automatically  
Obtained automatically (with a DHCP server)  
IP Network Setting  
IP Address  
169.254.X.Y (without a DHCP server)  
Subnet Mask  
Obtained automatically (with a DHCP server)  
255.255.0.0 (without a DHCP server)  
Default Gateway  
Obtained automatically (with a DHCP server)  
0.0.0.0 (without a DHCP server)  
DHCP Server  
Disabled  
DHCP Client  
Enabled  
Spanning Tree Protocol  
SNMP Read only Community  
SNMP Read Write Community  
TFTP Server  
Disabled  
Public  
Private  
192.168.1.254  
Time Settings  
Disabled  
Wireless Network Name (SSID)  
Band  
3Com  
2.4Ghz Mixed (Allow both 11b and 11g)  
Radio Channel  
11  
Broadcast SSID  
Enabled  
None  
Wireless Security  
7
Contents of CD  
The CD-ROM which is enclosed in the package should include the following contents:  
3Com 802.11g 54Mbps Wireless LAN Building to Building Bridge User Guide  
MIB Directory  
Includes 3Com MIBs for Network Management usage  
Diagnostic Utility  
3Com 3CDaemon Server Tool  
3Com Wireless Infrastructure Device Manager  
Readme file  
Copyright © 2005 3Com Corporation. All rights reserved. 3Com and the 3Com logo are registered trademarks of 3Com  
Corporation. All other company and product names may be trademarks of the respective companies with which they are  
associated.  
DIA-ASYG73-AAA03  
Published July 2005  
3Com Corporation  
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