ISDN Bandwidth Capabilities of Windows NT (133704)


The information in this article applies to:

  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0
This article was previously published under Q133704

SUMMARY

PPP Multilink Protocol (PPP MP) is a technology that provides up to 128 kilobytes per second (kb/s) wire speeds on a single ISDN line by combining two B-channel calls. Each B-channel provides a 64 kb/s link.

Microsoft supports Multilink Protocol starting with NT 4.0 and RAS.

MORE INFORMATION

Channel Aggregation is a proprietary method designed by Digi International (the makers of Digiboard) that allows speeds greater than 64 kb/s using 2 B- channels. To attempt to use speeds greater than 64kb/s, use one of the following methods:

Windows NT version 3.5x

Modify the phone book entry by editing the entry, clicking the ISDN button, and entering 2 in the Channels to Use category.

Windows NT version 4.0

  1. In Dial-Up Networking, click More, click Edit entry and modem properties.
  2. Select Multiple Lines in the Dial using drop down list.
  3. Click Configure and enter a phone number for each line which you are using.


For more technical information on the PPP Multilink Protocol, see RFC
  1. This RFC can be found on the World Wide Web at:

    http://www.cis.ohio-state.edu/htbin/rfc/rfc1717.html

For more general information regarding the PPP Multilink protocol or ISDN, connect to the following World Wide Web site:
Modification Type:MajorLast Reviewed:5/7/2003
Keywords:KB133704
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