
Implementation Notes for All Dial Services
117353-B Rev. 00
5-11
B Channel Support
In keeping with the BRI standard, each port on the ISDN/BRI module provides
two 64 Kb/s B channels for data transmission, allowing communication with two
remote locations simultaneously.
D Channel Support
The router supports full 16 Kb/s D channel signaling and call setup and teardown
between the router and ISDN switch. The D channel implementation complies
with the ITU-T (formerly CCITT) 1988 recommendations Q.921 and Q.931, and
provides signaling support for the following countries:
• INS-64, KDD, and NTT for Japan
• TS013 for Australia
• National ISDN 1, AT&T 5ESS Custom, and NT DMS-100 Custom for the
United States and Canada
• Swissnet 3 for Switzerland
• NET3 for Austria, Belgium, Denmark, France, Germany, Italy, Netherlands,
Norway, Spain, Sweden, Switzerland, and the United Kingdom
Bay Networks routers do not support data transmission across the D channel.
BRI Leased-Line Operation for Germany and Japan
For BRI service in Germany and Japan, you can configure a permanent
point-to-point ISDN connection over a B channel, without having to use the D
channel to dial the call. This connection operates like a leased line and is useful
when ISDN service providers do not use the D channel.
Leased-line operation supports PPP, Bay Networks Standard, and frame relay.
You select leased-line operation when you configure the application mode, that is,
the type of BRI service, for the BRI interface. To set the application mode using
Site Manager, see “Configuring BRI Lines” on page 2-8. To set the application
mode using the BCC, see “Configure BRI Lines” on page 3-11.
To modify the leased-line configuration, see “Modifying the BRI and PRI Modes
of Operation” on page 9-35.
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