EOC 2611P. I follwed the instruction to configure the antenna and when it come tthe time when i typed 192.168.1.1, i don't get the log in box for the antenna. I've been trying many time and i am jammed there. Could you help me. Thank you. Claude

IF you reset it, the password changed.

You need to enable the DHCP server on the EOC-2611P. Then it will negotiate an IP address with your PC without you having to set one by hand.

The seller fibbed. All of these units require configuration before they will operate. Configuration instructions are contained in the user manual:
EOC-8610EXT 8610SEXT User Manual

Number one, this isn't a clear question. Number two, you have no choice of antennas with the EOC-3220 unit, only the built-in directional antenna.

You can use this unit either as an access point, to provide wireless access to a network you already have, or as a bridge, to access a remote wireless network someone else has.
Note that you own the EXT model, meaning that you have to attach your own antenna to the connector before it will function. There is no internal antenna on this model.

Configuration instructions are available at
EOC-3220 Series User Manual
Factory reset instructions are available at:
http://engeniustech.com/datacom/support/general-details.aspx?id=65

First off, the EOC-3220 series comes in two choices: the ones ending in EXT, which require you to add an external antenna, and the ones without, to which there is no place to add an external antenna. So there is no decision to be made in the software configuration, because it's all handled above the software's pay grade.
Other Engenius models with "either/or" antennas come with a physical switch that allows you to choose between the internal antenna and the external jack. So again, there's no software contribution.

unscrew the antenna, and buy an rp-tnc connector and an n-male, then get an antenna with female n-type connector. LMR240 coax is better than RG58 for 2.4. which ever you use get the connectors to suit. Then crimp or solder them to your coax and away you go. no need for other settings ... just ssid of access point.

I have reset lots of these using the manufacturer's instructions.
Plug in the serial cable before powering on the unit. When you power on the unit, you should be able to see a log of what the unit is doing. If you can't, then your parity, bits, speed, etc. in Hyperterminal are set wrong.
When the unit stops logging (usually with a #), type in
flash reset (and hit the return key)
You should see a bunch more logging, indicating that the unit is shutting down and rebooting. After that, you should be able to log into the unit at 192.168.1.1 with admin/admin or admin/(blank).

Manual steps to perform a clean boot in Windows XP
Step 1: Start the System Configuration Utility
Click Start, click Run, type msconfig, and then click OK.

The System Configuration Utility dialog box appears.

Step 2: Configure selective startup options
1. In the System Configuration Utility dialog box, click the General tab, and then click Selective Startup.
2. Click to clear the Process SYSTEM.INI File check box.
3. Click to clear the Process WIN.INI File check box.
4. Click to clear the Load Startup Items check box.
5. Click the Services tab.
6. (VERY IMPORTANT DON'T MISS THIS) Click to select the Hide All Microsoft Services check box.
7. Click Disable All, then Click on the startup tab and click on Disable All Button and then click OK..
8. When you are prompted, click Restart to restart the computer.

Step 3: Log on to Windows
1. Log on to Windows.
2. When you receive the following message, click to select the Don't show this message or launch the System Configuration Utility when Windows start check box, and then click OK:
You have used the System Configuration Utility to make changes to the way Windows starts.

The System Configuration Utility is currently in Diagnostic or Selective Startup mode, causing this message to be displayed and the utility to run every time Windows starts.

Choose the Normal Startup mode on the General tab to start Windows normally and undo the changes you made using the System Configuration Utility.

Step 4: Optional step to disable features
This step temporarily disables Microsoft features such as Plug and Play, networking, event logging, and error reporting. Also, this step permanently removes the restore points from the computer. The System Restore feature uses restore points to restore your computer to an earlier state. If you remove the restore points, you can no longer restore Windows to an earlier state.
1. Click Start, click Run, type msconfig, and then click OK.

The System Configuration Utility dialog box appears.
2. Click the General tab, click to clear the Load System Services check box, and then click OK.
3. When you are prompted, click Restart to restart the computer.

Steps to configure Windows to use a Normal startup state
1. Click Start, click Run, type msconfig, and then click OK.

The System Configuration Utility dialog box appears.
2. Click the General tab, click Normal Startup - load all device drivers and services, and then click OK.
3. When you are prompted, click Restart to restart the computer.

Try to Flush DNS Cache
ipconfig /flushDNS

Also