HP 200 Series Services And Applications page 210

Improving Network Availability
Switched Circuit Types
Minimizing Connect-Time Costs
One of the most important issues with circuit switching is minimizing the
cost of connect time. Several connection controls have been provided to
manage the opening and closing of connections to avoid connection charges.
These controls are described later in this document.
Since all dynamic routing protocols such as RIP generate periodic traffic to
maintain routing tables, careful consideration must be given to the use of
these protocols on switched circuits. Static routes can be used to effectively
eliminate routing-protocol control traffic on switched circuits. This ensures
that switched circuits are opened only for the transfer of user data.
Switched Circuit Types
The routers' Configuration Editor allows the definition of two types of
switched circuits:
Manual adapter
V.25 bis adapter
These two circuit types can provide access to virtually any circuit-switching
facility including ISDN, Switched 56 or 384, and the Public Switched
Telephone Network. The following discussion assumes the use of an ISDN
network, so the term "adapter" is used instead of DSU/CSU. However, note
that the router functionality being discussed is independent of ISDN.
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