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This chapter covers the following topics that you need to master as a CCNP:

POTS versus ISDN; BRI and PRI Basics--These introductory sections examine the
underlying technology of ISDN and its components.

Basic Rate Interface--This section explores the technologies related to BRI-specific
implementations of ISDN technology.

Implementing Basic DDR--This section covers many of the commands used to
configure a basic DDR solution (the traditional methodology for deploying ISDN),
including the definition of interesting traffic, dialer maps, and static routes. This
section helps you understand DDR and the accompanying command structure.

Advanced DDR operations--This section covers a number of variable parameters
specific to a DDR implementation, such as the decision to use Cisco's proprietary
bandwidth on demand function to load share over multiple bearer channels as well as
the standardized PPP Multilink.

Primary Rate Interface--This section explains the concepts of and differences
between T1 and E1 PRI-based implementations.