To configure an Ascend Max or Pipeline to support this feature, from the Max or Pipeline Main menu, go to Ethernet. Then, go to Connections and then Telco Options. Under Telco Options, find the Data Service field. Change the value of the Data Service field to voice.
A: The ISDN modem software automatically determines to which COM port of your computer the ISDN modem is connected. Note that if you happen to have two 3ComImpact ISDN modems connected to your computer's COM ports, it's not possible to distinguish to which 3ComImpact IQ ISDN modem you are trying to communicate. Disconnect one of the 3ComImpact IQ ISDN modems while you configure the other one.
A: On each analog port, you can connect up to 3 analog devices (telephone, fax, analog modem) within 200 feet using an RJ-11 splitter. Although you can connect multiple devices to each port, you can place only one phone call per port at a time.
Some devices such as speaker phones require more power, thus reducing the number of devices that can be simultaneously connected to the analog voice port.
A: Yes, and if you have only one telephone outlet, remember to plug your internal modem's telephone cable into the 3C882 ISDN modem's analog port. (If you have another telephone line outlet you could plug your modem's phone cable into it.) Also, ensure that different COM ports are used.
A: The 3C882 ISDN modem is designed to operate with telephones that are compatible with the original AT&T 2500 touch-tone telephone standard. If you are attempting to use a portable telephone that does not conform to the AT&T 2500 touch-tone telephone standard, you may not be able to place and/or receive voice calls. Also, check with your local telephone company to ensure that your ISDN line has been provisioned for circuit switched voice on both B channels.
A: Please find out from your telecommunications coordinator if you are on a private network (e.g., Centrex). If this is the case, you may need to prefix all dialed numbers with a digit such as 9. This will give you the capability to place calls to destinations outside of your private network.
A: Check with your ISDN line provider to ensure a long distance carrier (e.g., AT&T, MCI, Sprint, etc.) was selected for your new ISDN line.
A: Make sure you are using a Group 3 fax machine. Check the documentation which came with your fax machine.
A: Ask your telecommunications coordinator if you are on a private network (e.g., Centrex). If so, you typically need to dial a number such as 9 before you can place a call.
Also, ensure that your telephone conforms to the AT&T 2500 touch-tone telephone standard. If it does, verify that it is working properly by connecting it to another telephone jack or by substituting the telephone with another telephone.
A: No, the phone ports only work with analog devices.
A: If your 3ComImpact IQ ISDN modem does not respond to AT commands, check the following:
A: Your ISDN line must support Flexible Call Offering (FCO), also referred to as Additional Call Offering (ACO) to allow incoming DBA to work. Check with you telephone company to determine whether or not your ISDN line supports this feature and, if not, how to have this feature added to your ISDN line.
If you ISDN line does support FCO or ACO, ensure that DBA is enabled. (It is enabled by default.) If you think it may be disabled, enable DBA by using a terminal emulation program to send the following command to the 3C882 ISDN modem: AT S70=1.
A: No, you must use the power supply provided with your 3ComImpact IQ ISDN modem.
MultiLink PPP FAQs
- How can I tell if I have established a MultiLink call?
- How do I disable MultiLink PPP?
- What if I have to dial two telephone numbers to establish a MultiLink PPP call?
- While attempting a MultiLink PPP call, why is it that I can establish one B channel connection, but not the second?
- Can I place or receive a voice call while a MultiLink PPP call is active?
Q: How can I tell if I have established a MultiLink call?
A: Both of the B channel LEDs on the 3C882 ISDN modem's front panel, B1 and B2, will be illuminated green. Also, 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, 115000 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 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, type the following command:
ATD [telephone number 1] & [telephone number 2]
For example, ATD 908 555 1212 & 908 555 1213.
If you are using NetManage Chameleon NFS, you will need version 4.6.3 or higher
to use the ampersand (&) character to dial two telephone numbers.
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. (If you are trying to dial into the Internet, check with your Internet Service Provider.)
- Call your telephone company and check the ISDN line settings. Ensure that data is supported on both B channels, that the circuit-switched data limit is 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:
ATD [telephone number 1] & [telephone number 2]
- If you are running Windows 95 or Windows NT, try disabling CHAP by sending the command ATS84=1 to the 3C882 ISDN modem.
- If you are not running Windows 95 or Windows NT and CHAP is supported, send the command ATS84=0 (enable CHAP) to the 3C882 ISDN modem.
- 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.
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 free one of the B channels for the voice call once you lift the telephone handset. The MultiLink PPP call is uninterrupted; however, throughput will be reduced until the second B channel is reallocated. Once you replace the telephone handset, the B channel will be restored to the MultiLink PPP call.
NOTE: 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.
PC-related FAQs
- What minimum requirements must my IBM or IBM-compatible PC meet?
- Does the 3C882 ISDN modem work with Windows 95?
- Does the 3C882 ISDN modem work with Windows NT?
Q: What minimum requirements must my IBM or IBM-compatible PC meet?
A: An IBM or IBM-compatible PC must have the following:
- A 386, 486, or Pentium‚ processor
- Microsoft Windows 95, Windows NT, or Windows 3.x, MS-DOS, or IBM PC DOS 3.x
- 640 KB of conventional memory
- A hard disk drive with 2 MB of free space
- A high-density 3.5-inch floppy diskette drive
- VGA or compatible video graphics adapter and monitor (color recommended)
- An available serial communications port
For 230.4 Kbps data rate. You will need an enhanced serial port card and COM port driver software which supports 230.4 Kbps. Pacific CommWare (800) 856-3818 and Lava Computer Mfg. Inc. (416) 674-5942 enhanced serial port cards have been tested successfully with the 3C882 ISDN modem.
For 115.2 Kbps data rate. 3Com recommends that your IBM or IBM-compatible PC serial COM port be equipped with a 16C550 UART (universal asynchronous receiver/transmitter). To determine what UART is installed in your PC, run the Microsoft‚ Diagnostic Program (msd) from the DOS setup prompt.
Q: Does the 3C882 ISDN modem work with Windows 95?
A: Yes, all you need is the impact.inf file which is included in the latest release. If you do not have the impact.inf file, you can find it on 3Com's FTP site. For instructions on how to set up your 3C882 ISDN modem using Windows 95, request document number 4684 from 3ComFacts at (408) 727-7021 (analog telephone number).
Q: Does the 3C882 ISDN modem work with Windows NT?
A: Yes, all you need is the modem.inf file which is included in the latest release. If you do not have the modem.inf file, you can find it on 3Com's FTP Site (192.156.136.12). For instructions on how to set up your 3C882 ISDN modem using Windows NT 3.5.1 Remote Access Service (RAS), request document number 4686 from 3ComFacts at (408) 727-7021 (analog telephone number).
Macintosh-related FAQs
- What minimum hardware requirements must my Macintosh computer meet?
- What is the maximum serial port speed for a Macintosh computer?
- There's a physical connection between my 3C882 ISDN modem and my Macintosh computer, but I still can't access the 3C882 ISDN modem. Why?
- Does the 3C882 ISDN modem provide CCL script files?
Q: What minimum hardware requirements must my Macintosh computer meet?
A: You must have System 7 or later operating system; one free serial communications (modem) port and 2 MB of available space on your hard drive.
Q: What is the maximum serial port speed for a Macintosh computer?
A: Macintosh computer serial (COM) port speed maximums vary. Refer to the Technical Information guide which came with your Macintosh computer or call Apple Support. Macintosh models with low serial port speeds can be upgraded by adding an internal card. Creative Solutions, (800) 367-8465, offers an internal card with either two or four serial ports capable of 57.6 Kbps each for a maximum of up to 115.2 Kbps or 230.4 Kbps. Note that the 3ComImpact IQ 3C882 ISDN modem currently supports serial port speeds of up to 230.4 Kbps.
Q: There's a physical connection between my 3C882 ISDN modem and my Macintosh computer, but I still can't access the 3C882 ISDN modem. Why?
A: If you have an internal modem or Ethernet card installed in your Macintosh computer, there may be a conflict with the 3C882 ISDN modem. COM or serial ports can only support one device at a time. Also, AppleTalk/LocalTalk might be vying for the modem port, disabling AppleTalk often helps.
Q: Does the 3C882 ISDN modem provide CCL script files?
A: Yes, when you install the 3C882 ISDN modem software onto your Macintosh computer, the 3C882 CCL script files are copied and placed into your Extensions folder located in your System folder. These CCL script files uniquely identify the 3C882 ISDN modem within Internet access and remote access applications such as Apple's ARA and FCR's FCRppp.
