Installing the 3ComImpact™ and 3ComImpact™ IQ ISDN Modem with Windows NT 4.0
Last Revision: 07/30/97
Model Numbers: 3C87x, 3C882
This document explains the installation procedure for the 3ComImpact or 3ComImpact IQ ISDN Modem on a Windows NT 4.0 computer. Please note that this document does not cover the 3ComImpact software installation and ISDN line configuration. Refer to the Quick Start Instructions in Chapter 2 (3C87x) or Chapter 3 (3C882) of your User Manual for further assistance.
To install the modem, follow these instructions:
1. Click Start, Settings, and Control Panel. Double-click the Modems control panel. Click Add. The Install New Modem screen will open, as shown in Figure 1.
Figure 1 Install New Modem Screen
2. Check "Don't detect my modem; I will select from a list" and click Next.
Note: You will only see a 3Com entry if you have previously installed a 3Com modem.
3. Click Have Disk.
4. Insert the 3ComImpact Windows Installation diskette in drive A:\. Click Browse and highlight the impact.inf file. Click Open. Then click OK. The Install New Modem manufacture screen will open, as shown in Figure Two.
Figure 2 Install New Modem Manufacture Screen
The models listed here depend on the particular 3ComImpact modem that you are installing. Refer to your manual to discern the correct model type. Select the 3ComImpact Digital Data modem for ISDN usage, 3ComImpact plus Int Faxmodem for analog usage or if you have a 3C871 or 3C872. Select the 3ComImpact IQ for use with the 3C882 ISDN modem, or the 3ComImpact IQ 230K if you have installed an accelerated serial port card that supports up to 230.4 kbps. Typically these high speed serial cards have a 16650 UART or higher, and include their own serial driver.
4. Click Next.
5. Select the COM port to which your modem is connected and click Next. A message indicates successful modem installation.
1. Click Finish. You are now ready to configure your dial-up connection.
Configure Dial-Up Networking
The following instructions provide an example for setting up your Internet connection using Windows NT 4.0 Dial-Up Networking. Dial-Up Networking setup requires Internet Provider specific information; your particular setup parameters may vary widely. You may need to check with your Internet Service Provider (ISP) for assistance.
To configure Dial-Up Networking on a Windows NT 4.0 computer:
1 Click Start, Programs, Accessories, and choose Dial-Up-Networking. Click New to create a new connection. If you have not yet configured a Dial-Up Networking connection, a message will indicate that your phonebook is empty. Click OK to add an entry.
2. Type a name for your connection, and click Next. Typically, you would use the name of your ISP.
3. Select "I’m calling the Internet"and click Next.
4. Enter your ISP’s ISDN access number, and click Next.
This completes the initial ISP Dial-Up Networking definition.
5. Click Finish. The Phonebook entry screen opens, as shown in Figure 3.
Figure 3 Phonebook Entry Screen
You now have an opportunity to verify various settings of your Dial-Up Networking connection.
5. Click More, and select "Edit entry and modem properties", as shown in Figure 4.
Figure 4 Edit Entry and Modem Properties
Verify your ISP’s ISDN access number and your modem selection.
6. Click the Server tab. The Server Type screen opens, as shown in Figure 5.
Figure 5 Server Type Screen
7. Choose "PPP: Windows NT, Windows 95 Plus, Internet" from the Dial-up server type drop down box.
8. Check TCP/IP if you are dialing into an ISP for Internet access. If you are accessing a remote network, such as a corporate LAN, check with your MIS network administrator for the appropriate Network Protocols to select.
1. Click TCP/IP Settings.
10. If your ISP has assigned you a dedicated IP address, click "Specify an IP Address" and enter it here. In most cases your ISP will provide a dynamic IP address; in this situation you would check "Server assigned IP address". Enter your DNS and WINS server addresses if required.
9. Click OK.
9. Set Script to None unless specified by your ISP.
10. Change the Authentication method to "Accept any authentication, including clear text" for PAP authentication and "Encrypted Authentication" for CHAP under the Security tab.
1. Click OK.
Note: The 3ComImpact (IQ) does not support Microsoft Encrypted Authentication. X.25 is not supported either; therefore, no changes are required on the X.25 screen.
12. You are now ready to connect to your ISP using the 3ComImpact (IQ).
Frequently Asked Questions
Q: I setup everything correctly, but I still can’t dial out with Dial-Up Networking. What did I do wrong?
A: Your telephone company might require you to dial a 1 + <area code>, even if your call is local. If you’re dialing long distance, be sure that you subscribed to long distance service on your ISDN line and this service has been activated it for you.
Note: Symbols in the phone number field are not ignored when placing an ISDN data call, please remove any ‘( )’ and ‘-’.
Q: I get an error message that Dial-Up Networking can not find the modem when I try to place a call. What could have happened ?
A: Verify that you have selected the correct modem, e.g. make sure that the "3ComImpact IQ" is selected and not the "3ComImpact IQ 230k" when placing a call through a standard UART.
Q: How can I tell if I have established a Multilink PPP call?
A: Both of the B channel LEDs on the 3C882 ISDN modem's front panel, B1 and B2, will be illuminated green. Also, after you terminate your Dial-Up Networking call, you can use terminal emulation software to send the command AT\S. The result is a list of information about the call you just placed and it will indicate whether or not Multilink PPP is enabled.
Note that by default, the 3ComImpact IQ ISDN modem displays the COM port speed of your computer (for example, 115,200 bps). You can have both the COM port speed and the network connection speed displayed by sending the command ATW1 to the ISDN modem. Also, to display just the network speed, send the command ATW2 to the ISDN modem. Note that when establishing a Multilink PPP call, if you changed the default to display the network speed, it will only show a 56 Kbps or 64 Kbps connection, not 112 Kbps or 128 Kbps.
Q: How do I disable Multilink PPP?
A: To disable Multilink PPP, clear the Multilink PPP box located on the Configuration screen of the 3C882 ISDN modem software. Click Update to update the change.
Or, you can use terminal emulation software to send the following AT command to the 3C882 ISDN modem: ATS80=0. By default Multilink PPP is enabled. (ATS80=1).
Q: What if I have to dial two telephone numbers to establish a Multilink PPP call?
A: Sometimes the destination you are calling requires two separate telephone numbers to establish a Multilink PPP call. If this is the case, enter both phone numbers in the phone number field separating each other by an ‘&’. For example:
[telephone number 1] & [telephone number 2]
Note that sometimes even if your Internet Services Provider provides you with one phone number, you have to specify or dial it twice for a Multilink PPP connection.
(i.e. 555 1234&555 1234 )
Q: While attempting a Multilink PPP call, why is it that I can establish one B channel connection, but not the second?
A: There are several reasons why this may occur. Check the following:
• Ensure that Multilink PPP is enabled by checking the Multilink PPP check box in the Configuration screen or by sending the command ATS80=1 to the 3C882 ISDN modem.
• Ensure that the equipment you are dialing into supports Multilink PPP and your account is enabled for Multilink PPP. (If you are trying to Dial into the Internet, check with your Internet Service Provider.)
• Call your telephone company and check your ISDN line settings. Ensure that data is supported on both B channels, and that the circuit-switched data limit is set to 2.
• You may have to dial two telephone numbers to establish a Multilink PPP call. This would be a requirement of the equipment you are dialing into. If the destination you are calling requires two telephone numbers for Multilink PPP, type the following command:
[telephone number 1] & [telephone number 2]
• If you are dialing into an Internet Service Provider (ISP) and the second call connects for a period for up to ten (10) seconds and then the call is dropped, the second call is not connecting to the same equipment at the ISP. (This occurs when the ISP provides a single dial-in number which "hunts" between multiple routers.) The 3C882 ISDN modem automatically detects this, drops the call and will not attempt to re-establish Multilink PPP.
• To establish a Multilink PPP connection, it is required that your PPP account have a password. PPP accounts with no password will not authenticate on the second channel.
• You are using software that support MS-CHAP (such as Windows 95 and Windows NT). If you are required to authenticate using CHAP, make sure that the software you’re using supports MD5-CHAP (supported under Windows NT 4.0).
Q: Do I need to enter a Domain Name for authentication?
A: Yes, if the network protocol you are planning to use is NetBEUI. If your main purpose is to get on the Internet, NetBEUI is not needed. Therefore, do not select NetBEUI as the network protocol, and do not enter a Domain Name. Doing so may prevent you from establishing a Multilink PPP connection.
Q: Can I place or receive a voice call while a Multilink PPP call is active?
A: Yes, the 3C882 ISDN modem supports Dynamic Bandwidth Allocation (DBA). With DBA, you can place or receive a voice call while a Multilink PPP call is established. For example, if a voice call comes in while a Multilink PPP call is established, the 3C882 ISDN modem will ring the telephone and free one of the B channels for the voice call once you lift the telephone handset. The speed of the Multilink PPP call is reduced to one channel; however, the integrity of the call is maintained. Once you replace the telephone handset, the B channel will be restored to the Multilink PPP call.
NOTES:
• If you are on the receiving end of a Multilink PPP call and you place a voice call, one of the B-channels will be used for the voice call but once the voice call ends, the B channel cannot be returned to the Multilink PPP call. The B channel can only be returned to the Multilink PPP call if you placed the call.
• To receive incoming voice calls while on a Multilink PPP call, you will need to have Additional Call Offering (ACO) enabled on your ISDN line.
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