Technical data

90362-01 ISDN Connections 6-1
ISDN Connections 6
You can only configure for ISDN (Integrated Services Digital Network) on
NetBlazers that have the appropriate hardware. If your NetBlazer does not
have the appropriate integrated ISDN hardware, you will not be able to
access the ISDN configuration screen.
The NetBlazer LS ISDN model provides an integrated point to point Basic
Rate S/T interface. The BRI (Basic Rate Interface) is defined as two 64Kbps
Bearer (B) channels and one 16Kbps Data (D) channel that carries call setup
and user packet data across the network. This standard BRI connection links
your site directly to an ISDN-ready switch in your local telephone
company’s central office (C.O.). For the LS, the recommended line speed in
the U.S. is 56Kbps for the B-channels (the default).
The ISDN interface supports two independent 56 or 64Kbps calls. You can
create a set of balanced interfaces for a dial-up connection for ISDN to yield
a throughput of up to 128Kbps; see “Setting Balanced Interfaces” on
page 7-7 for more information.
The NetBlazer supports the Internet Draft of Compression Control Protocol
(CCP) for PPP. To use ISDN, the NetBlazer needs to be configured to use
PPP framing when you configure your applications.
The NetBlazer functions as an S/T interface and serves as a NT2 (Network
Termination type 2). You need to purchase an NT1 device to provide the U
interface (see Appendix J, “ISDN Service Providers and Manufacturers” for
more information on purchasing an NT1). If you need more information on
the acronyms and terminology used for ISDN, see Appendix L, "Glossary."
Note:
The NetBlazer does not support Bonding (a mechanism to use both
B-channels for one 128Kbps call). You can use interface balancing instead;
see “Setting Balanced Interfaces” on page 7-7 for more information.
As a point-to-point interface, the passive bus is not supported.