Microsoft KB Archive/150871

= Microsoft Knowledge Base =

Using Dual-Channel ISDN with The Microsoft Network
Last reviewed: October 7, 1997

Article ID: Q150871

The information in this article applies to:


 * The Microsoft Network versions 1.2, 1.3, 2.0, 2.5

SUMMARY
This article provides background information about dual-channel ISDN connections to MSN, The Microsoft Network. With dual-channel ISDN, connection speeds up to 128,000 bps are available.

MORE INFORMATION
Dual-channel ISDN uses multilink PPP (MP), which is an extension to the standard point-to-point protocol (PPP) for using TCP/IP over a dial-up connection. MP allows for combining both channels of an ISDN line connection to act as a single large pipe for a PPP connection. MP uses two channels on an Ascend MAX, one for each B channel of the ISDN line.

If an Ascend MAX has only one channel available, a connection is attempted to a channel on another MAX. When this happens, most connections fail.