3Com ISDN Modem Click the, 1Select the appropriate radio button (64 Kbps or TollMizer), To change the connection speed to 64 Kbps or TollMizer, do the following:

3-10 CHAPTER 3: CONFIGURATION FOR AN IBM-COMPATIBLE PC RUNNING WINDOWS

Additional configuration may be needed for Multilink PPP. For details refer to S registers 82 and 83 in Appendix B, “AT Commands, S Registers, and Result Codes”.

Note that if you disable Multilink PPP (i.e., Register S80=0), you can still place a Multilink PPP call without changing the S 80 register value. In the dial string, enter the first telephone number, then the ampersand character followed by the second telephone number. For example:

ATD 908 555 1212 & 908 555 1213

Configuring the B Channel Rate

Specify the B channel rate as 56 Kbps, 64 Kbps, or select TollMizer if you would like to use that feature. TollMizer allows you to place a 56 Kbps data call using a voice channel, which is often less expensive. Note that the device you are calling must also support TollMizer (sometimes referred to as Switch 56 Permissive or Data Over Voice) to take advantage of this feature.

By default, the B channel rate is 56 Kbps. Check with your telephone company for the appropriate B channel rate.

To change the connection speed to 64 Kbps or TollMizer, do the following:1Select the appropriate radio button (64 Kbps or TollMizer).

2Click the Update button to download the change to your 3C882 ISDN modem’s S register.

Configuring Voice Call Routing

The 3C882 ISDN modem allows you to assign a specific telephone number to a specified analog phone port. By default, telephone number 1 is assigned to phone port one, and telephone number 2 is assigned to phone port two, as shown in Figure 3-10.This is especially helpful should you